Cadmium (Cd)-contaminated soil presents substantial risks to both agricultural sustainability and human health. Pueraria thomsonii Benth. has emerged as a promising candidate for phytoremediation, owing to its high biomass production and Cd accumulation capacity. However, the physiological mechanisms underlying its Cd stress response and the associated safety of its edible product, arrowroot, remain poorly understood. This study evaluated the potential of exogenous calcium (Ca) to ameliorate Cd toxicity, improve phytoremediation efficiency, and ensure the safety of arrowroot. A two-year pot experiment was conducted using a factorial design comprising three Cd concentrations—control without exogenous Cd addition (0 mg kg⁻¹, Cd0), moderately contaminated (1.5 mg kg⁻¹, Cd1.5), and severely contaminated (15 mg kg⁻¹, Cd15) and four Ca application rates—0 (Ca0), 335 (Ca1), 446 (Ca2), and 670 (Ca3) mg kg⁻¹. Cd stress markedly suppressed plant growth, whereas Ca application significantly mitigated Cd-induced phytotoxicity. The efficacy of Ca was dose-dependent and varied with Cd stress; Ca3 (670 mg kg⁻¹) was most beneficial under control conditions to moderate Cd stress, while Ca2 (446 mg kg⁻¹) was most effective under severe Cd stress. These optimal Ca treatments enhanced yield by 18–58

【Objective】Soil texture is an important factor affecting soil pore structure and water retention capacity, which control plant-available soil water. This paper investigates the spatial variation in soil texture in tea plantations and its regulatory effects on soil pore structure and soil water content. 【Method】We studied 72 typical tea plantations across seven major tea-producing regions in Jiangxi Province. We measured soil particle composition, bulk density, total porosity, three-phase composition, saturated water-holding capacity, field capacity and relative water content of soil samples collected from these plantations.【Result】Soil texture in the study area was diverse, dominated by loamy clay (37.50%) and silty clay (20.83%). Sand content showed the highest spatial variability, with a coefficient of variation of 52.25%. Soil texture significantly affected soil physical structure. Clay loam had a significantly high bulk density than silty clay, sandy loam and loamy clay, while loamy clay featured favorable soil pore structure and high total porosity compared with sandy loam and clay loam. Soil texture is a key factor regulating soil water retention. Loamy clay had the highest saturated water-holding capacity (415.02 mg/kg), while clay soil exhibited the strongest available water retention capacity, with a relative water content of 54.07%. Correlation analysis revealed that sand particle content increased significantly with elevation and slope, but decreased significantly with longitude, latitude and plantation age. Silt particle content was significantly positively correlated with longitude, latitude and plantation age, and negatively correlated with elevation, slope and aspect. Clay particle content was significantly positively correlated with relative soil water content, longitude and latitude, and negatively correlated with elevation.【Conclusion】Soil texture in the tea plantations of Jiangxi Province is spatially heterogeneous, mainly controlled by topographic and geographical factors. Loamy clay exhibited the optimal soil pore structure and saturated water-holding capacity, whereas clay soil performed best in retaining available soil water.

This study investigated the growth, enrichment characteristics, and remediation potential of Pueraria thomsonii Benth. （"Hua ye ge" and "Gan ge er hao"） on cadmium （Cd）, arsenic （As）, and lead （Pb）-contaminated soils, the remediation potential of P. thomsonii in a large field experiment under different trial fields. The results showed that the whole plant biomass （dry weight） of P. thomsonii was 4.58-12.45 t·hm-2, and the biomass of "Hua ye ge" was higher than that of "Gan ge er hao." The contents of Cd, As, and Pb in different parts of P. thomsonii were 1.63-17.04, 0.15-20.97, and 0.40-231.12 mg·kg-1, respectively. The accumulations of Cd, As, and Pb of P. thomsonii were 14.01-109.06, 4.10-27.59, and 49.97-305.69 g·hm-2, respectively. The removal rates of Cd, As, and Pb of P. thomsonii were 0.40%-2.57%, 0.02%-0.08%, and 0.06%-0.09%, respectively. The bioconcentration factors of P. thomsonii for Cd, As, and Pb were 0.09-13.12, 0.01-0.38, and 0.01-0.76, respectively, and the translocation factors were 0.50-4.72, 1.27-15.89, and 1.19-35.68, respectively. Among them, the contents of Cd, As, and Pb in the main vine and the As accumulation and removal rate of "Hua ye ge" were all significantly higher than that of "Gan ge er hao" （P < 0.05）. The biomass was mainly concentrated in the tuber, while the heavy metal content and accumulation was mainly concentrated in the stem and leaf. Correlation analysis showed a significant positive correlation between soil Cd content and Cd content in the main vine and leaf of P. thomsonii （P < 0.05）. A significant positive correlation was observed between soil Pb content and Pb content in all parts of P. thomsonii （P<0.05）. Except for "Hua ye ge" in Xiangdong, the content of heavy metals in the commercial P. thomsonii portion （arrowroot） was lower than the standard limit for medicinal plants. In summary, the P. thomsonii showed strong absorption and transport capacity for Cd, As, and Pb. "Hua ye ge" was selected as a potential enrichment plant source for the remediation of severe Cd-based combined contaminated soil. Additionally, "Gan ge er hao" （used as Pueraria powder） was selected as a potential enrichment plant for the remediation of mild and moderate Cd-contaminated soil.

This study investigated the growth, enrichment characteristics, and remediation potential of Pueraria thomsonii Benth. （"Hua ye ge" and "Gan ge er hao"） on cadmium （Cd）, arsenic （As）, and lead （Pb）-contaminated soils, the remediation potential of P. thomsonii in a large field experiment under different trial fields. The results showed that the whole plant biomass （dry weight） of P. thomsonii was 4.58-12.45 t·hm-2, and the biomass of "Hua ye ge" was higher than that of "Gan ge er hao." The contents of Cd, As, and Pb in different parts of P. thomsonii were 1.63-17.04, 0.15-20.97, and 0.40-231.12 mg·kg-1, respectively. The accumulations of Cd, As, and Pb of P. thomsonii were 14.01-109.06, 4.10-27.59, and 49.97-305.69 g·hm-2, respectively. The removal rates of Cd, As, and Pb of P. thomsonii were 0.40%-2.57%, 0.02%-0.08%, and 0.06%-0.09%, respectively. The bioconcentration factors of P. thomsonii for Cd, As, and Pb were 0.09-13.12, 0.01-0.38, and 0.01-0.76, respectively, and the translocation factors were 0.50-4.72, 1.27-15.89, and 1.19-35.68, respectively. Among them, the contents of Cd, As, and Pb in the main vine and the As accumulation and removal rate of "Hua ye ge" were all significantly higher than that of "Gan ge er hao" （P < 0.05）. The biomass was mainly concentrated in the tuber, while the heavy metal content and accumulation was mainly concentrated in the stem and leaf. Correlation analysis showed a significant positive correlation between soil Cd content and Cd content in the main vine and leaf of P. thomsonii （P < 0.05）. A significant positive correlation was observed between soil Pb content and Pb content in all parts of P. thomsonii （P<0.05）. Except for "Hua ye ge" in Xiangdong, the content of heavy metals in the commercial P. thomsonii portion （arrowroot） was lower than the standard limit for medicinal plants. In summary, the P. thomsonii showed strong absorption and transport capacity for Cd, As, and Pb. "Hua ye ge" was selected as a potential enrichment plant source for the remediation of severe Cd-based combined contaminated soil. Additionally, "Gan ge er hao" （used as Pueraria powder） was selected as a potential enrichment plant for the remediation of mild and moderate Cd-contaminated soil.

Heavy metal contamination in farmland soils threatens food security and human health. Phytoremediation provides a sustainable strategy, with Pueraria thomsonii emerging as a promising candidate due to its high-biomass production. However, its metal accumulation dynamics remain uncharacterized. Therefore, a 3-year field experiment was conducted to investigate biomass production, the accumulation of heavy metals (Cd, Cr, As, and Pb) across growth stages, and the bioconcentration factor (BCF), translocation factor (TF), and removal rate in P. thomsonii. Results showed that P. thomsonii produced a total biomass of 10.81–21.22 t ha−1, accumulating 76.95–170.61 (Cd), 30.80–43.28 (Cr), 7.12–9.09 (As), and 18.16–39.30 (Pb) g ha−1 during 2020–2022. Stem Cd accumulation exceeded root tubers and leaves by 45%–205% at maturity, while leaf Cr, As, and Pb accumulation was higher than root tubers and stems by 149%–868%. Cd-BCF values >1 in stems and leaves indicated efficient bioaccumulation, contrasting with Cr-, As-, and Pb-BCF <1. Stem and leaf TF values of Cd, Cr, As, and Pb consistently exceeded >1 except for stem Cr TF in 2022. On average, in the 3-year experimental period, the removal rate of Cd surpassed Cr, As, and Pb by 94%–95%. Soil properties (organic matter, available N) significantly influenced BCF, while available N modulated TF. These findings suggest that the combination of high-biomass production and elevated Cd accumulation in stems positions P. thomsonii as a promising candidate for high-biomass phytoremediation of Cd-contaminated farmland soils.

Selenium (Se) is an essential element for humans and animals, and Se deficiency-related diseases are a significant global health concern. Tea may help ameliorate Se deficiencies. However, the mechanisms of natural Se enrichment in tea remain poorly understood, particularly in high-Se soils, such as those in Jiangxi Province. This study conducted a comprehensive field survey of 67 soil and tea samples from Jiangxi, a major tea production region in China, to analysis spatial variation in Se concentrations and identify key driving mechanisms. The average soil Se concentration across Jiangxi was 0.44 mg kg− 1, exceeding both global (0.15 mg kg− 1) and Chinese (0.29 mg kg− 1) averages. Soil Se content was significantly influenced by soil organic matter (SOM), total potassium (K), iron (FeOX) and aluminium (AlOX) oxides, and tea planting duration, contributing 15

利用2015年设置的旱地红壤耕作方式与有机肥投入试验,选取旋耕(R)、浅翻耕(S)、深翻耕(D)3个耕作方式为主处理,单施化肥(NM)、化肥和新鲜猪粪配施(PM)、化肥和粉碎水稻秸秆配施(CS)、化肥和新鲜肥田萝卜配施(GS)4个有机物投入种类为副处理,分析不同耕作方式与有机物投入对旱地红壤耕层水稳性团聚体及稳定性、土壤有机碳含量和作物产量的影响.连续5 a不同耕作与有机物投入试验结果表明:(1)旱地红壤水稳性团聚体组成发生改变,团聚体平均重量直径(MWD)和大团聚体含量(R0.25)显著提高,浅翻耕和肥田萝卜(SGS)措施提高水稳性团聚体稳定性效果较好.(2)不同耕作方式与有机物投入协同提高了土壤SOC含量,0～15 cm土层提高了4.52％～20.80％,15～30 cm土层提高了13.05％～20.96％.(3)花生产量提高了10.91％～40.07％,以浅翻耕和肥田萝卜措施(SGS)效果最佳;相关性分析表明花生产量与表层土壤SOC含量、MWD极显著正相关,与R0.25显著正相关.

[Objective] The paper aims to make sure the effects of continuous biochar application on dissolved organic carbon（DOC） in upland red soil. [Method] The soil physicochemical properties, rapeseed yield, DOC fluorescence spectrum components, and parameters were detected after 7 years of low-dose(750-1500 kg hm -2 ) biochar application.[Result] Biochar application reduced soil exchange Al 3+ (0.69-0.87 cmol kg -1 ), but decreased the soil pH（0.13-0.21）,organic matter（11.7%-18.1%）, and soluble carbon contents（127.5%-127.8%） compared with control. The pods’ number and the yield were increased 39.8%-45.1% and 3.5%-20.3%, respectively. And the trend was increased with the amount of biochar application. Continuous biochar application increased the proportion of tyrosine and fulvic acidlike in DOC, but reduced the proportion of microbial metabolites. Biochar application decreased fluorescence index（4.4%-10.6%）, freshness index（17.4%-18.4%） and biogenic index 0.26（22.6%）, and increased the humification index（1.2%-5.1%） in soil DOC. Correlation analysis indicated that soil DOC was positively correlated with soil pH, and negatively correlated with exchange Al 3+ . Microbial metabolites were negatively correlated with pH, and positively correlated with exchange Al 3+ . Soil tyrosine was negatively correlated with exchange Al 3+ . Redundancy analysis showed that soil pH and exchangeable H+ were the main indicators affecting the changes of soil DOC and its spectral characteristics. [Conclusion] Continuous low-volume biochar application in red soil dryland can increase rapeseed yield, improve the acidity of red soil, increase DOC content, fulvic acid-like substances, and humification coefficient to improve stability in DOC soil.

以井冈蜜柚主产地13个蜜柚园土壤为研究对象,调查分析0～20 cm和20～40 cm 土层土壤的基础理化性质以及细菌、真菌群落结构和多样性等指标,以期明确蜜柚园土壤与微生物群落结构的关系,为井冈蜜柚园的科学精准管理提供科学依据.结果表明,采样区土壤pH值均呈酸性,土壤综合肥力总体处于中等偏下水平.0～20 cm 土层土壤细菌和真菌的物种丰富度均高于20～40 cm 土层.变形菌门、酸杆菌门、绿弯菌门、放线菌门是蜜柚园土壤的优势细菌类群;子囊菌门、担子菌门、被孢霉门和毛霉菌门为优势真菌类群.土壤pH值、有机质含量、可溶性有机碳含量是采样区果园土壤细菌、真菌群落结构分异的关键驱动因子,此外,土壤真菌群落结构还受土壤碱解氮、有效磷、速效钾等养分含量的影响.因此,建议在井冈蜜柚果园管理过程中增施有机肥,以改善土壤肥力和调控土壤微环境.

2019-2020年在江西进贤以籼粳杂交稻甬优12为材料,在施氮量255kg/hm2、基肥∶分蘖肥∶穗肥=4∶3∶3条件下,设置8个氮素穗肥施用期处理,研究其对产量及其构成因素、齐穗后干物质积累量及剑叶相对叶绿素含量(SPAD值)、氮肥利用率和稻米品质的影响,探索一季籼粳杂交稻氮素穗肥的最佳施用期.结果表明,随着穗肥施用期的推迟,穗粒数和产量均呈先增加后降低的趋势,且在抽穗前14d处理产量最高;抽穗后水稻剑叶SPAD值的变化则呈现不同的趋势,抽穗前35～14d施肥为逐渐降低,抽穗前7d至抽穗后14d为先升高后缓慢降低;抽穗后干物质积累量、氮肥农学利用率和偏生产力呈先增加后下降趋势,以抽穗前14d或21d施穗肥处理最高.穗肥施用期对水稻出糙率、精米率、整精米率、粒长和籽粒长宽比影响不显著,但显著影响垩白粒率和垩白度,随施用期推迟,垩白粒率和垩白度逐渐降低.总之,抽穗前14～21d是一季籼粳杂交稻的最佳氮素穗肥施用期,有利于提高抽穗后叶片SPAD值和群体干物质积累量,促进氮肥的吸收与利用,确保充足的穗数和较大的穗型,增产提质显著.

为探究施用有机肥对粉葛干物质和养分积累与分配的影响,设置单施化肥(CK)、单施有机肥(OM)和 50%化肥+50%有机肥(CM)3个处理,分析粉葛不同生育期下各器官干物质和养分积累量及分配比例的变化.结果表明:伸长期、膨大期干物质、养分总积累量表现为OM、CM处理显著低于CK(伸长期磷除外),采收期不同处理干物质和养分积累量差异不显著;与CK相比,含有机肥处理(OM、CM)虽显著降低了采收期分枝和叶片中积累的氮(N)、磷(P)、钾(K)养分含量(P<0.05),但使采收期块根干物质分配比例提高了 8.53%～12.5%.含有机肥处理能够为粉葛中后期持续供应养分,提高粉葛块根干物质和养分积累量,从而提高块根产量,尤以CM处理最佳.

This study aimed to elucidate the cadmium (Cd) concentration and transport characteristics of Pueraria thornsonii in farmland with different Cd pollution degrees, so as to provide a reference basis for phytoremediation of Cd-contaminated farmland. The multi-point experiments in farmland with different Cd pollution degrees[ω(Cd) 0.32-38.08 mg·kg-1] were conducted, and the biomass (dry weight), Cd content, accumulation, concentration, and transport of Cd in P. thornsonii tissues under the main growing period were assessed. According to the results, for P. thornsonii, the tuber dry weight ranged from 5.04 to 11.98 t·hm-2, biomass ranged from 13.21 to 29.07 t·hm-2, and Cd accumulation ranged from 15.74 to 106.03 g·hm-2in the study area. The pattern of Cd uptake by P. thornsonii showed that the main vine>leaf>lateral branches>basal part of sti>tuber. The Cd content in P. thornsonii tissues considerably increased with soil Cd content (P<0.05), whereas the biomass decreased significantly (P<0.05). The Cd concentration and transport factor of aboveground parts in P. thornsonii showed a trend of initially falling, then increasing and decreasing again, whereas the Cd enrichment and transport coefficient of tubers gradually decreased. Correlation analysis revealed that the amount of Cd in the soil was a major predictor of Cd accumulation in P. thornsonii. Under light to moderate Cd contamination, the commercial portion of P. thornsonii (arrowroot)[ω(Cd) 0.03-0.22 mg·kg-1] was less than the standard limit for medicinal plants (≤ 0.30 mg·kg-1). In P. thornsonii from moderately contaminated areas, the Cd concentration and transport factor of aboveground parts were 2.43-7.97 and 3.02-9.81, respectively. This indicates that P. thornsonii is a prospective plant ideal for remediating Cd-contaminated soil because of its high capacity to transfer and enrich Cd.

申优26是江西通过"籼改粳"专项引进的双季晚粳稻品种,为了摸索其高效栽培技术,通过田间小区试验,探究施氮量、氮肥运筹和抛秧盘量对其产量及构成和氮肥利用效率的影响.结果表明,申优26在江西中等肥力田块做双季晚稻种植时,随着施氮量和分蘖肥施用比例的增加,其产量和氮肥利用效率呈现先增加后降低的趋势,其适宜施氮量和氮肥运筹比例分别为270 kg/hm2和基蘖穗比例4:5:1.随着抛秧盘数量的增加,申优26的产量及氮肥偏生产力也相应等比例增加,且差异达显著水平.因此,从产量及提高氮肥利用效率来看,申优26在江西做双季晚稻种植,适应的施氮量水平为270 kg/hm2,基蘖穗的氮肥运筹比例为4:5:1,同时增加20％的抛秧盘以增加基本苗.

Understanding the effects of seasonal changes of long-term fertilization on the physical and chemical properties of red soil and maize yield under double cropping maize system, and identifying the driving factors of yield change can provide theoretical support for cultivated land quality and rational fertilization in this area. In this study, we selected four treatments including no fertilizer（CK）, chemical fertilizer alone（NPK）, fresh pig manure alone（OM） and chemical fertilizer combined with fresh pig manure（NPKM） based on a long-term specific fertilization experiment on dryland red soil set up in 1986; and explored the effects of different fertilizations on soil physical and chemical properties in 0～20 cm and 20～40 cm depth after harvest of double-cropping maize and maize yield. The results showed that compared with CK treatment, NPKM treatment significantly decreased soil bulk density in 0～40 cm soil layer at maturity of spring maize and autumn maize. The content of large aggregates（＞250 μm）, the mean weight diameter（MWD） of aggregates, the contents of soil nutrients such as pH, SOC, available nitrogen（AN）, available phosphorus（AP） and available potassium（AK） were significantly increased, and the yield of spring and autumn maize was increased by 6.1 fold and 15.1 fold, respectively. Compared with CK treatment, soil bulk density of 0～20 cm soil layer in NPK treatment increased by 1.13% and 2.49%, while pH decreased by 0.22 and 0.48 units in spring and autumn maize, respectively.Compared with NPK treatment, in 0～20 cm soil layer, OM and NPKM treatments decreased soil bulk density by 2.5% and 3.2%,increased MWD by 20.9% and 43.6%, pH increased by 1.44 and 1.12 units, and increased SOC by 22.0% and 41.2%, respectively.The soil layer of 20～40 cm also showed a similar pattern, and the yield of double season maize increased by 1.2～6.8 fold. The results of random forest model showed that SOC content in 0～20 cm soil was the most important factor affecting maize yield, while AK and AP in 20～40 cm soil were the most important factors affecting spring maize yield and autumn maize yield, respectively.Fertilizer combined with organic fertilizer can improve the structure of dryland red soil, and increase soil nutrient content and crop yield, which can maintain high and stable crop yield and farmland quality.

产业振兴是乡村振兴的物质基础,葛产业对于优化种植结构和助力区域特色经济发展具有重要意义.现结合2020—2021年实地调研和问卷调查资料,分析了江西葛产业发展现状,梳理了江西葛产业在种植效益、全产业链和产业政策等方面存在的问题.鉴于此,提出了加大种植科技研发力度、培育龙头企业、完善全产业链、制定产业发展规划、出台产业政策等对策建议.

为摸清江西省粉葛生产状况,为实现葛产业提质增效、绿色发展提供依据,调查分析了江西省15个主产县区具有代表性的17块葛田土壤养分状况,研究了其与单株块根干重的相关性,并分析了限制粉葛产量养分因子.结果表明:(1)调查区土壤pH、有机质、碱解氮、速效磷、速效钾、全氮、全磷和全钾均值分别为4.77 g/kg、20.35 g/kg、25.12 mg/kg、17.33 mg/kg、136.91 mg/kg、1.19 g/kg、0.54 g/kg和16.30 g/kg.(2)调查区葛田土壤均呈酸性,土壤养分总体中等偏差,调查区葛田各养分的缺乏比例为35.39％(速效钾)～100％(碱解氮).(3)相关性分析表明,除速效钾对单株块根干重负显著影响外,其他各养分对块根干重影响差异不显著.因此,建议通过平衡施肥、减少化肥用量及有机无机配施以改善土壤养分状况,施用碱性肥或石灰改良酸性土壤,进而提高葛田土壤生产力.

为探索葛渣资源化利用新途径,通过室内蚯蚓养殖试验,研究了新鲜葛渣、腐熟葛渣及鲜葛渣与牛粪不同配比对赤子爱胜蚓（Eisenia fetida）生长繁殖的影响,以及蚯蚓堆制处理前后物料肥力属性的变化,并利用种子发芽实验判断蚯蚓堆肥效果。结果表明,纯鲜葛渣和纯腐熟葛渣不利于蚯蚓生长和繁殖。蚯蚓在鲜葛渣和牛粪的复混物料中可以正常生长繁殖,10%鲜葛渣复混90%牛粪的物料更有利于蚯蚓繁殖。不同物料经蚯蚓堆肥处理后,总有机质含量显著降低,总养分含量显著升高,种子发芽指数有一定程度的升高,70%鲜葛渣复混30%牛粪经蚯蚓堆肥处理后的总养分含量为102.2 g·kg -1 ,比10%鲜葛渣复混90%牛粪高出57.7%。研究表明,蚯蚓生物处理技术可应用于葛渣肥料化利用中,采用70%鲜葛渣复混30%牛粪进行蚯蚓堆肥,资源化利用效果最佳。

为评价不同冬耕模式在红壤坡耕地的适宜性,研究了连年冬耕(CK)、 隔年冬耕(T1)及不冬耕(T2)等3种冬耕模式对土壤理化性质、花生产量及经济效益的影响.结果表明:(1)与CK相比,T2处理或T1处理冬耕间隔期显著增加了花生播种旋耕前0～20 cm土层土壤容重(P<0.05),并显著降低了0～20 cm土层土壤水分含量(P<0.05);(2)与CK相比,T1处理对0～20 cm土层土壤养分的影响较小,仅显著降低了10～20 cm土层土壤速效钾含量(P<0.05),而T2处理则显著降低了10～20 cm土层土壤有机质、碱解氮和速效钾含量(P<0.05);(3)不同冬耕模式通过影响花生播种旋耕前0～20 cm土层土壤容重和水分含量可影响花生出苗率和产量,不同冬耕模式通过增加或降低10～20 cm土层速效钾含量也会造成花生增产或减产;(4)不同冬耕模式3年(2018～2020年)经济效益以CK最高,T1处理降低6.90％,T2处理经济效益降幅较大为43.5％.从维持红壤坡耕地土壤质量和经济效益角度考虑,连年冬耕是红壤坡耕地优良的冬耕模式,部分红壤坡耕地可适当进行冬季轮耕.

为了探讨茶园土壤碳、氮、磷含量及生态化学计量特征及其对环境因子的响应,在江西省茶叶主产地不同海拔、种植年限的茶园采集0～20 cm土壤样品,用于测定土壤有机碳(SOC)、总氮(TN)、总磷(TP)含量并计算化学计量比.结果表明:①茶园土壤SOC、TN含量均值分别为13.84、1.37 g/kg,均高于全国土壤平均水平,达到Ⅰ级茶园肥力指标,而土壤TP含量均值为0.47 g/kg,低于全国土壤平均水平,达到Ⅱ级茶园肥力指标;②土壤C:N、C:P、N:P均值分别为10.97、32.61、3.49,均低于全国土壤平均水平,表明茶园土壤P具有较高的有效性,而土壤N相对缺乏;③随着海拔的增加,土壤SOC含量、C:N、C:P均表现出先减少后增加的趋势,土壤TN含量、TP含量、N:P则变化规律不明显;④随着种植年限的增加,土壤SOC含量、TN含量、C:P均表现出增加的趋势,土壤N:P呈现先增加后减少的趋势,土壤C:N呈现先减少后增加的趋势,而土壤TP含量变化规律不明显.建议在茶园经营过程中适当施加氮肥以维持氮磷元素平衡.

为探讨搭架种植条件下粉葛不同部位N、P、K养分吸收及分配特点,于粉葛采收期从江西省15个县(市、区)的17个粉葛搭架种植基地采集85株植株样品,分析粉葛N、P、K养分吸收及分配特性.结果表明:各部位N含量表现为叶片>葛头>主藤>侧枝>块根,P含量表现为葛头>主藤>块根>叶片>侧枝,K含量表现为块根>葛头>侧枝>叶片>主藤.N、P、K养分间的相关分析表明,主藤、侧枝、叶片中N含量与K含量呈显著正相关,块根中P含量与K含量呈显著正相关,而葛头和叶片中P含量与K含量呈极显著正相关.粉葛块根中N、P、K养分平均分配比例分别为43.14％、55.47％、62.36％,均高于其他部位.每生产100 kg粉葛的N、P、K养分吸收量分别为0.88、0.09、0.89 kg,N、P、K吸收比例为1.00:0.10:1.01.粉葛对氮、钾需求较多,生产上应根据土壤养分供应状况合理满足粉葛对氮、钾的需求,并适当配施磷肥.