Dissolved organic carbon (DOC) constitutes the most active carbon pool in soils and plays critical roles in soil carbon cycling, plant productivity, and global climate change. Accurately assessing soil DOC quantity is essential to elucidate ecosystem functions and services. However, global driving factors and the spatial distribution of soil DOC remain poorly quantified, largely due to limited large-scale data. Here, we compile a comprehensive global database of soil DOC concentrations, encompassing 12 807 observations extracted from 975 scientific publications published between 1984 and 2020. We also record detailed geographic locations, climatic variables, and soil properties as predictors. Machine learning techniques were employed, including 10-fold cross-validation and evaluating model performance by R2 and root mean square error values, to predict the relative importance of various predictors and the global distribution of soil DOC concentrations. Worldwide soil DOC concentrations ranged from 0.04 to 7859 mg kg-1, averaging 222.78 mg kg(-1.) The 14 selected predictors, including elevation, soil properties, and climate, explained 63 % of the variance in soil DOC concentrations. Elevation played the most important predictor for soil DOC prediction, followed by soil organic carbon, seasonal variability of temperature, and soil clay content. Soil DOC decreases initially but increases when soil clay content exceeds 20 % and seasonal variability of temperature exceeds 0.7. Using these findings, a global map of predicted soil DOC concentrations was produced at a 0.05 degrees by 0.05 degrees resolution. Global soil DOC concentrations generally increased from the Equator to the poles wherein the topsoil layer (0-30 cm) holds 13.47 Pg of soil DOC with substantial variations across continents. These results inform soil management practices strategies, ecosystem services evaluations, and climate change mitigation efforts. Furthermore, we envision integrating our database with other carbon pools to advance understanding of total soil carbon turnover and to refine Earth system models. The dataset is publicly available at 10.6084/m9.figshare.28574183 (Ren and Cai, 2025).

Dissolved organic carbon (DOC) in agricultural soils is a pivotal indicator of soil carbon response to management practices, facilitating substance transport, energy transfer, and information exchange. Despite its importance, there is limited understanding of the global impact of these practices on the magnitude, drivers, and functionality of soil DOC. Here, we conducted a meta-analysis of 3539 paired DOC, 196 paired soil carbon dioxide (CO2) emissions, and 1424 paired crop yields from cropland soils to fill this knowledge gap. Management practices included conservation tillage (CT), nitrogen fertilizer, straw, manure, nitrogen combined with straw (NS), nitrogen combined with manure (NM), and biochar. DOC under NM, manure, NS, straw, nitrogen fertilizer, biochar, and CT increased significantly by 78.21%, 49.91%, 41.02%, 25.68%, 18.4%, 14.89%, and 9.74%, respectively. Except for biochar and CT, the other management practices also led to an increase in the DOC/SOC ratio, ranging from 7.66% to 15.79%. Biochar application decreases the DOC/SOC ratio by 25.02%, indicating its soil carbon stability and the potential for carbon sequestration. The intensity and duration of management practices emerged as driving factors influencing the DOC. Each unit increase of DOC under nitrogen fertilizer, straw, and NM not only effectively decreased the effect size of CO2 emissions, but also increased the effect size of crop yields in contrast to CT, manure, NS, and biochar. Overall, this study highlighted the importance of the intensity and duration of management practices on DOC. The regulation of DOC through management practices is also required to account for both environmental aspects and crop yields for sustainable agricultural development.

Nitrogen (N) deposition is a vital process of N cycling and is consequently important for the evaluation of N budgets. However, the character and quantity of N deposition inside the horticultural greenhouse remain unknown, impeding a deep understanding of N cycling among soil, vegetable and atmosphere. Here, we measured the dry and wet N deposition, and disentangled the relative percentages of ammonia (NH3) and nitrogen oxides (NOX) gases deposition based on the greenhouse vegetable cultivation experiment. Results found the annual N deposition, was 7.2-17.5 kg N.ha(-1) under different chemical/organic N fertilizer managements, consisting of 77.0%-85.5% by dry deposition and 14.5-23% by wet deposition. The proportions of N deposition from NH3 and NOX emissions ranged within 37.5-83.0% under different N managements. The NH3 emission was the dominant driving factor of dry N deposition, while soil moisture was the dominant driving factor of wet N deposition. Controlled-release fertilizer combined with organic fertilizer resulted in the lowest N deposition (10.2 kg N.ha(-1)) and NH3 and NOX emissions (12.5 kg N.ha(-1)), which could be recommended as the mitigation strategy in greenhouse cultivation. This study investigated the dry and wet N deposition characteristics and their influencing factors, as well as the proportion of N deposition attributed to NH3 and NOX emissions, which provides preliminary understanding of N deposition and the reactive N gas diffusion from greenhouse into the atmosphere.

The rhizosphere is the most active soil area for material transformation and energy flow of soil, root, and microorganism, which plays an important role in soil biochemical cycling. Although the rhizospheric nitrogen (N) and phosphorous (P) were easily disturbed in the agroecosystem, the effects of rhizosphere on the dynamics of soil N and P cycling have not yet been systematically quantified globally. We sum-marized the magnitude, direction, and driving forces of rhizosphere effects on agroecosystem's N and P dynamics by 1063 observations and 15 variables from 122 literature. Rhizosphere effects increased available N (AN, 9%), available P (AP, 11%), and total P (TP, 5%), and decreased nitrate N (NO3-N, 18%) and ammonia N (NH4-N, 16%). The effect of rhizosphere on total N (TN) was not significant. These effects improved AN in tropical (12%) and subtropical (14%) regions. The effect of rhizosphere on TP was greater under subtropical conditions than in other climates. The most substantial effects of the rhizosphere on TP and AP were observed under humid conditions. Rhizosphere effects increased AN and AP in vegetables more than in other crop systems. Application of N > 300 kg ha-1 had the most significant and positive rhizosphere effects on TN and AN. P application of 100-150 kg ha-1 had the greatest rhizosphere effects on TP and AP. These effects also improved the microbial (biomass N and P) and enzymatic aspects (urease, acid phosphatase, and alkaline phosphatase) of soil P and N cycling. Structural equation modeling suggested that aridity indices, fertilizer application rate, soil pH, microbial biomass, and soil enzymes strongly influence the magnitude and direction of the rhizosphere's effect on the P and N cycles. Overall, these findings are critical for improving soil nutrient utilization efficiency and modeling nutrient cycling in the rhizosphere for agricultural systems.& COPY; 2022 International Research and Training Center on Erosion and Sedimentation, China Water and Power Press, and China Institute of Water Resources and Hydropower Research. Publishing services by Elsevier B.V. on behalf of KeAi Communications Co. Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

Estimating ammonia (NH3) emission factors (EFs) for vegetable production can support assessment of potential atmospheric pollution risk and provide information for mitigating NH3 volatilization. The EFs in greenhouse and open-field systems under different fertilization, irrigation regimes, vegetable types and soil properties in both greenhouse and open-field vegetable production systems in China are poorly understood. An integrated analysis was performed, including 282 field measurements of NH3 volatilization from 54 field studies, to quantify ammonia EFs under different management practices and soil properties. The results showed that the mean ammonia EF across all measurements was 4.2 % (3.6 %-4.8 %). The EFs of greenhouse and open-field systems were 2.0 % (1.5 %-2.5 %) and 6.3 % (5.4 %-7.2 %), respectively. There was a power function relationship between nitrogen application rate and ammonia EF in greenhouses. No relationship was identified between nitrogen application rate and ammonia EF in the open-field system. The EFs of organic fertilizers were lower than those of both chemical fertilizers and the combination of chemical and organic fertilizers. EFs of leafy vegetables, cabbages, solanaceous vegetables and melons were 2.7 %, 2.9 %, 1.4 % and 1.4 % in the greenhouse system, and 5.2 %, 5.7 %, 7.6 % and 9.7 % in the open-field system, respectively. The EFs of the greenhouse production system increased with increasing soil organic matter. Boosted regression tree analysis showed that N application rate, pH and soil organic matter were the main driving factors of EFs in the greenhouse system. Vegetable type, pH and soil organic matter were the main driving factors in the open-field system. In this study, the EFs were evaluated and distinguished across greenhouse and open-field systems, and the results provided accurate EFs under different management practices and soil properties for vegetable production in both greenhouse and open-field systems.

Improved management of agricultural soils plays a critical role in mitigating climate change. We studied the temporal effects of the adoption of no-tillage (NT) management, often touted as an important carbon sequestration strategy, on soil organic carbon (SOC) storage in surface and subsurface soil layers by performing a meta-analysis of 1061 pairs of published experimental data comparing NT and conventional tillage (CT). In the early years of adoption, NT increased surface (0-10 cm) SOC storage compared to CT but reduced it in deeper layers leading to a decrease of SOC in the entire soil profile. These NT-driven SOC losses diminished over time and the net change was approaching zero at 14 years. Our findings demonstrate that NT is not a simple guaranteed solution for drawing down atmospheric CO2 and regenerating the lost SOC in cropping soils globally and highlight the importance of long-term NT for the recovery of initial SOC losses.

Excessive nitrogen fertilizer application in greenhouses could cause a significant variation in the nitrogen-use efficiency at the regional scale. This study aims to quantify agronomic nitrogen-use efficiency (AEN) and identify its driving factors across Chinese greenhouse tomato cultivation. Three hundred and forty-eight AEN values were obtained from 64 papers, including mineral nitrogen (MN) and mineral combined with organic nitrogen (MON) treatments. The average AEN values for the MN and MON treatments were 56.6 ± 7.0 kg kg−1 and 34.6 ± 3.5 kg kg−1, respectively. The AEN of the MN treatment was higher than that of the MON treatment for cultivation using soil with an organic matter content of less than 10 g kg−1 and the drip fertigation method. The AENs of the MN and MON treatments were divided into two segments according to the nitrogen application rate. The inflection points of the nitrogen application rate were 290 and 1100 kg N ha−1 for the MN and MON treatments, respectively. When the ratio of organic nitrogen to total nitrogen was less than 0.4, it was beneficial for improving the AEN. The soil organic matter content and the nitrogen application rate were the most critical factors determining the AEN. These results suggest that rationally reducing the nitrogen input and partially substituting mineral nitrogen with organic nitrogen can help improve the nitrogen-use efficiency.

Mining is an activity that will change the distribution and chemical speciation of rare earth elements (REEs), thus posing a serious threat to the natural environment. However, the distribution and chemical speciation of REEs in ion-adsorption rare earth tailings remain poorly understood. In this study, we investigated the contents and forms of REEs and associated geochemical behavior in rare earth tailings in southeast China. Total rare earth elements (TREEs) contents were lower while the ratios of light REEs (LREEs) to heavy REEs (HREEs) were higher in tailings than in an unmined area. In the unmined area, the distribution characteristics of TREEs and LREEs remained consistent, whereas HREEs differed with increasing depth. However, in the tailing area, the distribution characteristics of TREEs, LREEs and HREEs tended to be consistent, reflecting the outcomes of mining activities on vertical distribution characteristics of REEs. The REEs were dominated by residual and exchangeable forms in the unmined area, while residual and exchangeable REEs accounted for 80% and 20% of the TREEs, respectively, in the three tailings. Additionally, the exchangeable and carbonate-bound REEs increased but Fe/Mn oxide-bound and organic-bound REEs declined in the unmined area, whereas their distribution characteristics were irregular in the tailings. These results suggest that mining activity could curtail REEs contents and redistribute their chemical speciation, further altering geochemical behaviors in the tailings and posing serious risks to adjacent environments.

为阐明在南方花岗岩红壤侵蚀区植被恢复对稀土迁移的影响,探讨稀土迁移的植物阻控效应,本研究以空间序列代替时间序列法选取不同治理年限下的典型样地,深入剖析其稀土含量特征,旨在量化评估生态林草措施下不同治理年限内阻控稀土迁移的生态效应.结果表明,水土流失样地随着生态恢复年限的增加,植被覆盖度的提高,植物种类的丰富,水土流失地土壤环境得到了改善,表层稀土流失也呈现出下降的趋势;土壤-芒萁系统中,稀土元素生态富集系数Ax呈现出先增加后下降的趋势,说明了土壤中稀土含量的增加短期内促进了稀土元素向芒萁植物叶片的迁移.芒萁植物叶片优先富集土壤中的轻稀土元素,充分体现出超累积植物芒萁一定程度上可阻控稀土元素向下游迁移,有可能达到生物调控环境中稀土污染的目的.研究成果可为拓展南方红壤侵蚀区稀土迁移的生物阻控提供科学依据.

Improved management of agricultural soils plays a critical role in mitigating climate change and achieving the Agricultural Sustainable Development Goals.. We studied the temporal effects of the adoption of no-tillage (NT) management, often touted as an important carbon sequestration strategy, on soil organic carbon (SOC) storage in surface and subsurface soil layers by performing a meta-analysis of 1061 pairs of published experimental data comparing NT and conventional tillage (CT). In the early years of adoption, NT increased surface (0-10 cm) SOC storage compared to CT but reduced it in deeper layers leading to a decrease of SOC in the entire soil profile. These NT-driven SOC losses diminished over time and the net change was approaching zero at 14 years. Our findings demonstrate that NT is not a “silver bullet” for drawing down atmospheric CO 2 and regenerating the lost SOC in cropping soils globally and highlight the importance of long-term NT for the recovery of initial SOC losses.

碳中和是指人类活动造成的碳排放与全球人为碳吸收量在一定时期内达到平衡,也称为净零排放 [1].《巴黎协定》第四条提出采取减排增汇措施以实现21世纪后半叶人为温室气体排放量与汇的清除量达到平衡 [2].越来越多的国家正将其转化为战略和行动,目前已有100多个国家提出碳中和目标承诺,并明确了碳中和时间表.2020年9月第75届联合国大会一般性辩论上,中国宣布CO2排放力争于2030年前达到峰值,努力争取2060年前实现碳中和 [3],这既是我国的主动战略选择,也是实现绿色转型和可持续发展的内在需求.

Global crop yield loss due to ground-level ozone (O 3 ) concentrations is a major challenge to food security, but a dose-response association is not easy to quantify. Here, we propose using a new metric, O 3 sensitivity of crop yield (Y o ), to estimate yield loss under different O 3 time intervals using four observational databases. The Y o metric shows a non-linear parabola with elevated atmospheric O 3 for wheat, maize, rice, soybean, and assorted vegetables. Spatial heterogeneity of yield loss varies as a function of crop type and O 3 intervals. Estimates of yield loss from ozone suggest recent losses (2017-2019) may reach as high as 537 million tonnes, with a significant proportion coming with lower (30-40 ppb) exposure (325 million tonnes). Our results suggest that previous research, which only included higher (>40 ppb ozone), may have had grossly underestimated the negative effect of atmospheric O 3 on crop production. Suppose these results are endemic to global crop production. In that case, additional research will be necessary to reassess ozone sensitivity and dose-responses, both spatially and temporally, to determine future air pollution impacts.

[目的]设施菜地存在施肥量过大、肥料利用率低、环境污染等问题.通过对天津市设施菜地施肥现状调查,明确设施菜地施肥现状和存在问题,为制定科学合理的施肥方案提供依据.[方法]本研究对天津市193个设施蔬菜地块施肥现状展开调查,明确设施菜地施肥特征,估算肥料总养分和化肥养分减施潜力.[结果]天津市日光温室平均养分施用总量为N 775.6 kg/hm2、P2O5715.5 kg/hm2和K2O 524.9 kg/hm2,显著大于塑料大棚对应养分平均施用总量N 670.9 kg/hm2、P2O5584.5 kg/hm2和K2O 425.3 kg/hm2(P＜ 0.05).有机肥是设施菜地养分的主要来源,对日光温室和塑料大棚N、P2O5和K2O各自施用总量的贡献均超过50％.日光温室和塑料大棚中,化肥对磷(P2O5)施用量的贡献分别为44.2％和48.8％.从养分施用方法看,N、P2O5和K2O基施比例日光温室分别为79.4％、80.2％和73.5％,塑料大棚分别为70.2％、78.2％和67.4％,P2O5基施比例大于N和K2O.日光温室和塑料大棚平均养分施用比例(N:P2O5:K2O)分别为1.00:0.92:0.69和1.00:0.87:0.63.相比推荐施肥量,天津市设施蔬菜N和P2O5普遍施用过量,甘蓝和白菜K2O投入不足.设施菜地总养分(N+P2O5+ K2O)减施潜力在31.5％～65.0％,化肥养分减施潜力在22.4％～66.6％.[结论]天津市设施菜地养分以基施为主,其中化肥基施比例偏高,追肥养分比例过低,养分总量过量施用现象普遍.设施菜地基施化肥和追肥中P2O5比例偏高,养分结构不合理.主要设施蔬菜中,茄子、番茄和芹菜的N和P2O5施用总量远超过各自推荐施肥量,化肥养分减施潜力较大,是设施蔬菜肥料减施关注的重点.

Collapsing hill and gully as a representative erosion type of granitic low hill region in Southern China,its geochemical elements were redistributed while a large number of sediments were taken away with erosion process. In this study,three collapsing hill and gullys which had vegetation coverage of 2%,20%,90% respectively and an adjacent hillside without collapsing hill and gully as contrast region(CK) were selected as the research object in Huangniken collapsing hill and gully group,Changting County,southwest of Fujian Province. The sample points were distributed in the different part of collapsing hill and gully system which included catchment slope,collapsing hill and gully wall,collapsing body and gully-alluvial. The contents of Ti,Zr and Y which are inert elements and their correlation with soil physical properties analyzed and,were the spatial distribution characteristics of Ti,Zr,Y in collapsing hill and gully system were discussed. The results indicated that:1) The content of Ti,Zr,Y represented the property of Ti>Zr>Y,and their contents increased with the vegetation coverage increasing(B1<B2<B3); The content of Ti,Zr,Y in B3 exceed that of B1 and B2. 2) Ti,Zr,Y all occurred redistribution under the effect of Collapsing hill and gully erosion; the Ti content of three Collapsing hill and gullys with different vegetation coverage was significantly lower than the CK,Ti has a tendency to homogenize,Zr and Y were accumulated in gully-alluvial;3) The contents of Ti,Zr,Y were significantly related with pH,OM content. Zr and Y are closely related.

【Objective】This study was done to elucidate C, N and P distributions in soil aggregates and their stoichiometric characteristics in eroded red soil under vegetation restoration relative to history of the restoration. 【Method】Six sample plots were set up on slope lands of typical eroded red soil under vegetation restoration with different restoration history（0, 5, 10, 15, 30 and 80 years） located in Hetian Town, Changting County, Fujian Province of Subtropical China. Soil samples were collected from different soil layers（0;0 cm and 20;0 cm） of the six plots for analysis of contents of organic carbon, total nitrogen, total phosphorus in soil aggregates different in particle size（>5 mm, 2; mm, 0.5; mm, 1; mm, 0.25; mm and <0.25 mm）. 【Result】 Results show that the contents of organic carbon, total nitrogen, total phosphorus in soil aggregates varied in the range of 2.06;7.71 g·kg;, 0.54;.12 g·kg; and 0.034;.189 g·kg;, respectively, and C︰N, C︰P and N︰P did in the range of 3.06;3.05, 21.4;85.6 and 5.62;8.20, respectively. On the whole the contents of organic carbon, total nitrogen, total phosphorus and C︰N increased in all fractions of soil aggregates in both soil layers with the restoration going on（P<0.05）, and the trend was more significant in the 0;0 cm soil layer than in the 20;0 cm layer, while soil C︰P and N︰P displayed a rising-falling-rising trend, and C︰P deceased with soil depth, and N︰P did not vary much. The contents of organic carbon, total nitrogen and total phosphorus, and C︰N and C︰P on the whole increased with the aggregates going down in particle size（P<0.05）, except for the plot of 0 year, while N︰P did not vary much with aggregate particle size（P>0.05）. The content organic carbon, total nitrogen and total phosphorus in soil aggregates were remarkably positively related to their respective ones in the soil. In the soil aggregates the contents of organic carbon and total N positively related to C︰N, the content of organic carbon was to C︰P, and the content of total phosphorus was to N︰P. 【Conclusion】All the findings in the study demonstrate that vegetation restoration mitigates soil erosion and significantly increases the contents of organic carbon, total nitrogen and total phosphorus and improves the function of soil aggregates as carbon and nitrogen pools, and what is more, P in the aggregates is the major factor restraining rehabilitation of the degraded ecosystem.

崩岗是南方红壤区侵蚀沟在水力和重力交互作用下沟头遭受坍塌、陷蚀作用而形成的围椅状地貌,是该区域土壤侵蚀及生态系统退化的最高表现形式之一.为揭示崩岗侵蚀对土壤理化特性及可蚀性的影响,以福建省长汀县濯田镇黄泥坑崩岗群内植被盖度分别为2％,20％,95％的3个典型崩岗为研究对象,分别对崩岗系统内的集水坡面、崩壁、崩积体和沟口进行采样和理化特性的测定,并运用EPIC模型测算土壤可蚀性(K).结果表明:1)从集水坡面到崩壁、崩积体至沟口,3个崩岗的土壤砂粒质量分数、pH值和土壤密度呈升高趋势,粉粒、砂粒的质量分数和含水量呈下降趋势.2)1号和2号崩岗,集水坡面的土壤有机质质量分数最高,在崩壁最低;3号崩岗土壤有机质质量分数在崩壁处急剧下降,在崩积体中又明显上升.3)各崩岗中集水坡面、崩壁和崩积体的土壤颗粒组成、土壤密度和含水量差异较小,各土壤理化特性指标在沟口与集水坡面、崩壁和崩积体之间存在显著差异.4)崩岗系统内的集水坡面、崩壁、崩积体和沟口4个子系统的K值差异显著,1、2号崩岗呈现崩壁＞崩积体＞沟口＞集水坡面的变化规律,而3号崩岗则表现为沟口＞崩积体＞崩壁＞集水坡面的趋势.5)崩岗系统内的黏粒质量分数、pH值和有机质质量分数与土壤可蚀性关系密切,可以作为表征崩岗土壤可蚀性的有效指标.崩岗侵蚀造成土壤理化特性不断恶化,砂化严重,研究崩岗系统的土壤理化特性与可蚀性空间变化规律,对指导崩岗的恢复与重建具有重要意义.

为深入了解不同植被恢复年限下土壤团聚体养分分布特征,以典型红壤侵蚀区福建省长汀县河田地区恢复年限分别为0,5,10,15,30,80 a的坡地土壤为研究对象,分别对0-20 cm和20-40 cm土层不同粒径团聚体养分含量进行测定,并分析了它们与不同团聚体的相关关系.结果表明:(1)植被恢复过程中,土壤团聚体有机碳、全氮、全磷、全钾、速效磷和速效钾含量的变化范围分别为2.06～27.71 g/kg,0.54～2.12 g/kg,0.034～0.171 g/kg,2.20～6.89 g/kg,0.31～3.30 mg/kg和7.35～85.71g/kg;(2)有机碳、全氮、全磷和速效磷含量随着团聚体粒径的减小总体上表现出显著升高趋势(P＜0.05),全钾和速效钾含量无明显差异(P＞0.05);(3)随植被恢复年限增加,各粒径团聚体中有机碳、全氮、全磷、速效磷含量总体上呈显著升高趋势(P＜0.05),全钾含量先升高后降低,而速效钾含量表现出波动增加趋势;(4)恢复初期(0 a和5 a)不同土层间团聚体养分含量无明显变化(P＞0.05),其它恢复年限0-20 cm土层团聚体有机碳、全氮、全磷、速效磷和速效钾含量显著高于20-40 cm土层(P＜0.05);(5)团聚体对土壤养分的贡献率表现为(＞5 mm)＞(2～5 mm)＞(0.5～1 mm)＞(1～2 mm)＞(0.25～0.5 mm)＞(＜0.25 mm),＞2 mm粒径养分贡献率达34.18％～49.93％,土壤养分含量与＞0.25 mm粒径相关性较强(P＜0.01).植被恢复在降低土壤侵蚀的同时,土壤团聚体养分含量明显增加,土壤结构得以改善,养分固持能力得到加强.

[Background] Collapse mound,called "Benggang"in Chinese geomorphic pictograph,has been known to describe a kind of erosion phenomenon in hilly and mountainous area among subtropical and fractional tropical climatic zone of south China that gully head collapsed,transported and developed a deep-cut shape,concave-deforming deep-seated failure landform. [Methods] To reveal the effects of collapse mound erosion on soil available nutrients and stoichiometry ratios,we chose 3 collapse mounds of slight,moderate and strong erosion intensities in Huangniken collapse mound groups of Changting County of Southwest Fujian as research object. Soils at 0- 10 cm,10- 20 cm and 20- 30 cm in 4 positions of upper catchment,collapsing wall,colluvial deposit and channel were sampled,and the contents ofammonium N( NH+4-N),nitrate N( NO-3-N),available P( AP) and available K( AK) and related physical-chemical properties,such as mechanical composition,bulk density,water content,and organic matter content were measured,finally,the stoichiometric characteristics of available nutrients were analyzed. [Results] The results indicated that: 1) With erosion intensity increasing,the contents of NO-3-N and AP occurred in the collapse mound of strong > moderate > slight,and the content of NH+4-N was the lowest and AK was the highest in collapse mound under moderate erosion; horizontally,the diminishing order of contents of soil available nutrients were displayed as following: AK > NH+4-N >NO-3-N > AP,while the content of each available nutrient decreased vertically as soil depth increasing,and their variance of the same erosion intensity was very little. 2) With different erosion intensities,AN( NH+4-N + NO-3-N) / AP ratio showed: slight > moderate > strong, and there was significant difference( P < 0. 05) between slight and moderate collapse mound; AK / AN ratio was in moderate >slight > strong,and there was significant difference( P < 0. 05) between moderate and strong collapse mound; AK / AP ratio was in slight > strong > moderate,and difference was significant( P < 0. 05)between slight and moderate. 3) From upper catchment,collapsing wall,colluvial deposit and channel,the averaged content of NH+4-N and NO-3-N showed a downward tendency, while AP increased gradually,and AK was the lowest at colluvial deposit,but in 3 other sections they varied slightly under different erosion intensities; meanwhile,AN / AP and AK / AP ratios decreased from slope of catchment area to channel,but the value of AK / AN ratio was the highest at channel. 4) Stoichiometric ratios of soil available nutrients were closely correlated to sand,silt,p H value and organic matter,but they were impacted slightly by the clay,bulk density and water content. [Conclusions] collapse mound erosion resulted in variation of soil available nutrients and stoichiometry ratios with different layers and position.