Casuarina equisetifolia L., a key pioneer species in tropical and subtropical coastal shelterbelts, suffers from ecological decline owing to recurrent infestations by Lymantria xylina Swinhoe. To address this, we deciphered the molecular defence mechanisms and identified reliable biomarker metabolites for resistance breeding. Phenotypic analyses suggesting that the resistance to L. xylina was jointly mediated by antixenosis and antibiosis, and three resistant half-sib families (e.g., 3-52, 5-80 and 5-218) were preliminarily identified. Integrated transcriptomic and metabolomic profiling of L. xylina herbivory demonstrated significant enrichment of differentially expressed genes in the circadian rhythm-plant, jasmonic acid signaling and phenylpropanoid biosynthesis pathways-which may mediate the optimization of defence responses. In parallel, differential accumulation metabolites were predominantly enriched in α-linolenic acid metabolism. In particular, the content of α-linolenic acid strongly correlated with resistance, while flavonoids and tannins also exhibited significant positive correlations, confirming their roles in the defence response. These results suggest that the α-linolenic acid to phenylpropanoid cascade may function as a core defence axis in C. equisetifolia against L. xylina. Collectively, α-linolenic acid, flavonoids and tannins serve as candidate biomarkers for breeding insect-resistant C. equisetifolia genotypes.

IntroductionConiferous_to_broadleaved forest conversion reshapes soil carbon cycling in coastal sandy ecosystems, yet its regulation on component soil respiration and thermal sensitivity remains poorly quantified. To explore the regulatory effects and underlying mechanisms of such vegetation shift on soil carbon cycling in subtropical coastal sandy lands, we carried out this comparative field study.MethodsWe investigated the conversion from Pinus elliottii (coniferous forest) to Eucalyptus urophylla × E. grandis (broadleaved forest) using a paired adjacent plot design and two_year continuous in_situ observations. Key indicators including soil respiration components, litter properties, fine root biomass, microbial activity and soil microclimate were monitored.ResultsResults showed that the conversion significantly increased total soil respiration (by 25.52%), root respiration (by 62.74%), and heterotrophic respiration (by 9.01%). This promotion was driven by the coupled effects of improved litter quality (low C/N ratio and lignin content), a sharp increase in fine root biomass (by 272.5%), and enhanced microbial activity. It also notably reduced the temperature sensitivity (Q10 from 2.29 to 1.55) of soil respiration, with root respiration becoming nearly temperature_insensitive (Q10=1.25). Additionally, the explanatory power of soil temperature for respiration decreased significantly (from 76% to 37.7%), while the regulatory role of litter quality, fine root biomass, and soil microbial activity became prominent, and soil moisture did not act as a limiting factor for soil respiration throughout the study period.DiscussionThis conversion achieves a virtuous cycle of “high carbon turnover and high carbon sequestration”, clarifying the above_belowground coupling mechanism of soil carbon dynamics. Our findings thereby provide important scientific support for the optimization of coastal protection forests and the enhancement of carbon sequestration capacity in fragile coastal ecosystems.

Lymantria xylina is the most important defoliator, damaging the effective coastal windbreak tree species Casuarina equisetifolia. However, the underlying genetic mechanisms through which C. equisetifolia responds to L. xylina attacks remain unknown. Here, we compared the transcriptional, phytohormone and metabolic differences between susceptible (S) and resistant (R) C. equisetifolia cultivars in response to L. xylina feeding. The main L. xylina-induced resistance in C. equisetifolia was a jasmonate (JA) response and JA synthesis was highly induced by L. xylina feeding at both the transcriptional and metabolic levels, thus promoting flavonoid accumulation. The JA response was highly activated by L. xylina feeding on the R but not in the S cultivar, although the JA signalling pathway was intact in both cultivars. We found a single amino acid mutation in the homologues of glutamate receptor-like protein 3.6 (CeGLR3.6T807I) in the S cultivar. Compared with the GLR3.6 homologues in the R cultivar, phosphorylation of CeGLR3.6T807I was not induced by insect feeding, leading to a decreased JA response in the S cultivar. Collectively, this study provides new insights into the function of CeGLR3.6 in regulating the JA response of C. equisetifolia to L. xylina feeding.

Phosphorus (P) deficiency is critical to the renewal barrier of she-oak (Casuarina equisetifolia), an important tree species used for coastal protection. However, the response of she-oak to P deficiency remains unclear. In this study, we compared the phenotypes of two she-oak cultivars, the P deficiency-sensitive 'Chihu219' and the insensitive 'Chihu397', and found that P deficiency significantly increased root growth, P concentration and phosphorus absorption efficiency (PAE) in Chihu219, but not in Chihu397. We also analyzed the transcriptome and metabolome of these cultivars under different P conditions and showed that trans-zeatin riboside (tZR) levels were highly suppressed by P deficiency in Chihu219, but not in Chihu397. Furthermore, exogenous tZR suppressed both root P concentration and PAE while promoting P-use efficiency. We also identified CeIPT5 (isopentenyltransferase 5) as a key regulatory gene of tZR biosynthesis and found that its expression was more highly induced by P deficiency in Chihu219 than in Chihu397. We also showed that overexpression of CeIPT5 in insensitive she-oak lines reduced tZR concentration and increased root P concentration compared with the vector control. Taken together, P deficiency can greatly reduce tZR accumulation in P deficiency-insensitive she-oak at least by activating the tZR accumulation regulatory gene, CeIPT5, thereby promoting root elongation and P concentration. This study not only provides a genetic basis for enhancing PAE in woody plants but also establishes a theoretical basis for optimizing root structure and improving nutrient utilization efficiency, thereby promoting sustainable forestry development.

Lymantria xylina is the most important defoliator, damaging the effective coastal windbreak tree species Casuarina equisetifolia . However, the underlying genetic mechanisms through which C . equisetifolia responds to L . xylina attacks remain unknown. Here, we compared the transcriptional, phytohormone and metabolic differences between susceptible (S) and resistant (R) C . equisetifolia cultivars in response to L . xylina feeding. The main L . xylina -induced resistance in C . equisetifolia was a jasmonate (JA) response and JA synthesis was highly induced by L . xylina feeding at both the transcriptional and metabolic levels, thus promoting flavonoid accumulation. The JA response was highly activated by L . xylina feeding on the R but not in the S cultivar, although the JA signalling pathway was intact in both cultivars. We found a single amino acid mutation in the homologues of glutamate receptor-like protein 3.6 (CeGLR3.6 T807I ) in the S cultivar. Compared with the GLR3.6 homologues in the R cultivar, phosphorylation of CeGLR3.6 T807I was not induced by insect feeding, leading to a decreased JA response in the S cultivar. Collectively, this study provides new insights into the function of CeGLR3.6 in regulating the JA response of C . equisetifolia to L . xylina feeding.

[目的]探讨南亚热带4种典型桫椤群落特征及生物多样性与土壤因子之间的耦合关系,为我国桫椤种群的科学保护和合理开发提供理论参考资料和依据.[方法]在福建省闽侯南屿国有林场选取4种典型的桫椤群落设置12块样地,分乔、灌、草和层间层进行群落学调查,分析4种群落各层物种组成、生物多样性,再运用CCA排序法分析4种桫椤群落样地及其物种重要值与土壤理化性质的关系.[结果]所调查的12块样地总共记录维管植物72种,隶属于43科66属,其中乔木13种,灌木32种,草本12种,层间植物21种;枇杷叶紫珠+杉木+桫椤群落乔木层Shannon-Wiener指数、Simpson指数、Pielou(1)指数和Pielou(2)指数与其他3种群落存在显著差异(P<0.05),柳杉+桫椤群落层间层的Margalef指数、Shannon-Wiener指数、Simpson指数、Pielou(1)指数和Pielou(2)指数总体上高于其他3种群落,其群落结构与其他3种群落存在较大差异;4种群落的桫椤种群在草本层稀少;4种群落的桫椤种群与土壤理化性质相关关系均不明显.[结论]试验地林下桫椤幼苗稀少将导致桫椤种群趋向退化,在管护过程中应加强桫椤自然更新的研究,减少人为干扰,促进桫椤种群的稳定和发展.

4 月 20 日,国家林业和草原局发布 2023 年第 12 号公告,根据《中华人民共和国种子法》《中华人民共和国植物新品种保护条例》 《中华人民共和国植物新品种保护条例实施细则(林业部分)》规定,经国家林业和草原局植物新品种保护办公室审查,授予 217 项植物新品种权,并颁发《植物新品种权证书》.此次获得授权的包括 45 个属(种)植物,从种属分布到首次获得授权的种属数量,相比以往均有较大变化.

大余县池江镇兰溪村坐落在绿水青山间,当年项英、陈毅率领红军在此地坚持游击战争,是远近闻名的红色堡垒.如今,兰溪村已建起了纪念小广场.小广场旁有一处土木结构的瓦房,就是当年陈毅隐居过的地方.说起兰溪村的红色故事,大余县委党史办副主任朱常打开了话匣子.兰溪村有一座静谧的农家小院,土木结构的青瓦房,占地面积约200平方米,门额题匾上"陈毅同志旧居"六个大字遒劲有力.

Casuarina equisetifolia plantations of eight areas in the five provinces in different southeast coastal latitudes（Hainan, Guangdong, Guangxi, Fujian and Zhejiang） were taken as the research subjects.This paper studied the distribution pattern of biomass and productivity of middle-aged forests and mature forests with latitude, and analyzed the correlation between productivity and main environmental factors of Casuarina equisetifolia plantation.The results of the study were as follows: the height and biomass of middle-aged forests decreased with the increase of latitude and the DBH in low latitude areas was higher than that in high latitude areas; biomass of middle-aged forests and mature forests in Casuarina equisetifolia plantation did not change regularly on latitude gradient; the biomass distribution of middle-aged forests and mature forests in Casuarina equisetifolia plantation showed as trunk＞root＞branch＞leaf, except for the middle-aged forests in Casuarina equisetifolia plantation in Dianbai of Guangdong province; the productivity of Casuarina equisetifolia plantation decreased with the increase in the age of forests, and the productivity of middle-aged forests in Casuarina equisetifolia plantation on higher latitude in Wenzhou of Zhejiang province was significantly lower than that in other research areas; the productivity of mature forests in Casuarina equisetifolia was of no significant difference among each study area; the productivity of middle-aged forests in Casuarina equisetifolia plantation was significantly correlated with annual average temperature, annual average precipitation and actual evapotranspiration, while that of mature forests was not significantly correlated.

Casuarina equisetifolia (L.) is an indispensable tree species in the construction of the backbone of the shelterbelt system in subtropical coastal regions, as it can resist wind, sand, drought, and salt. Under global warming and water shortage, it is important to clarify the mechanisms through which C. equisetifolia adapts to drought stress and to breed drought-resistant varieties in order to enhance the ecological protection provided by coastal shelterbelts. Here, we aimed to explore the response characteristics of C. equisetifolia to drought stress and investigate the associations of NAC genes with drought resistance. Seedlings of 16 half-sib C. equisetifolia families were subjected to drought treatment. Seedling growth, morphology, physiological and biochemical indices, and drought resistance were comprehensively evaluated. The drought-resistant families designated 4-383, 3-80, 3-265, 3-224, and 1-195 were selected using multiple indices and methods. Correlation and structural equation model analyses revealed that CCG007578 might regulate growth and osmoprotection in C. equisetifolia while CCG028838 and CCG004029 may scavenge reactive oxygen species. The correlation and structural equation model analyses of seedling height growth (ΔH), survival rate (S), malondialdehyde (MDA), superoxide dismutase (SOD), and CCG007578 expression were used to identify drought resistance in C. equisetifolia. The aforementioned drought-resistant families provide basic materials for future research on genes encoding drought-resistance proteins and the molecular breeding of drought-resistant C. equisetifolia.

Acacia crassicarpa (Fabaceae), a nitrogen-fixing tree species, is critically important for coastal protection in southeast China. In this study, we report the complete chloroplast genome sequence of A. crassicarpa, with a length of 176,493 bp. It contains a pair of inverted repeats (IR 39,851 bp), a large single-copy region (LSC 91,869 bp), and a small single-copy region (SSC 4,922 bp). The complete genome comprises 138 genes, including 93 protein-coding genes, 37 tRNA, and 8 rRNA genes. Our phylogenetic analysis reveals that A. crassicarpa is closely related to A. podalyriifolia and A. dealbata.

为评价锥栗园生草法相比传统清耕法和施用化学除草剂法,果园土壤质量的绿肥恢复效益,本研究以福建典型的红壤丘陵山区锥栗园为研究对象,采用随机区组设计,将供试样地均分为面积0.3～0.5 hm2的若干试验小区,全园清除自然杂草后,设置撒播鼠茅草(Mode1)、黑麦草(Mode2)、光叶紫花苕(Mode3)3种生草处理,并以施用草甘膦(CK1)和清耕(CK2)处理为对照,每种处理3个重复,2年后,分析3种冷季型绿肥、清耕及施用草甘膦对锥栗园土壤理化性质、酶活性、微生物群落等指标的影响.结果表明:1)相较于清耕处理和喷施草甘膦处理,3种生草处理土壤碱解氮、有效磷、速效钾含量有明显提升,其中鼠茅草处理最高,分别为74.14、156.87和234.76 mg·kg-1;黑麦草处理土壤孔隙度最高,为56.03％;鼠茅草和黑麦草处理土壤蔗糖酶活性提升明显,分别为32.29和26.87 U·g-1.2)5种处理土壤共有优势细菌类群主要为放线菌门、变形菌门、绿弯菌门和酸杆菌门,相对丰度分别为24.9％～28.9％、20.9％～28.8％、13.7％～18.6％和10.8％～12.9％,共有优势真菌类群主要为子囊菌门和担子菌门,相对丰度分别为37.4％～73.7％和15.3％～54.4％.3)相较于清耕处理,3种生草处理细菌群落Chao1指数和Shannon指数均有所提升,真菌群落有所下降.4)相较于清耕处理和喷施草甘膦处理,3种生草处理土壤变形菌门、拟杆菌门和厚壁菌门细菌相对丰度均有所下降,绿弯菌门和浮酶菌门细菌则有所增加,生草促使锥栗园土壤细菌群落由快速生长型向缓慢生长型转变.5)5种处理细菌群落和真菌群落非计量多维尺度转换排序(NMDS)表明,土壤真菌群落分异程度高于细菌群落.6)相关分析(CA)和冗余分析(RDA)表明,生草处理通过改变土壤蔗糖酶、过氧化氢酶活性和碱解氮含量,喷施草甘膦处理通过改变土壤碳氮比,清耕处理通过限制土壤自然含水率改变真菌相关优势类群.综上,锥栗园短期人工生草对土壤理化性质和酶活性有一定程度的改善作用,生草处理与清耕处理和喷施草甘膦处理均会形成特异土壤真菌群落.

以平潭岛幸福洋6 a生木麻黄基干林为研究对象,选用6种典型的冠幅—胸径关系模型,采用决定系数(R2)、平均绝对误差(MAE)、剩余均方根误差(RMSE)和变异系数(CV)等检验指标,筛选最优模型,并利用Matlab GUI回调函数对模型进行程序设计,模拟预测基干林冠幅和胸径生长动态.结果表明:(1)木麻黄基干林最优冠幅—胸径关系模型为CW =-2.558+2.037 In DBH;(2)经过计算机模拟抚育预测,林分株数密度分别为＞3 000株·hm-2、2 000～3 000株·hm-2和＜2 000株·hm-2的6 a生木麻黄基干林,最有利于木麻黄径向生长的模拟抚育间伐年限分别为6 a、4 a和5 a,平均胸径分别可以增加16.73％、24.03％和19.08％,平均冠幅可增长31.65％、11.89％和13.95％.

为探讨不同森林类型对滨海风沙土肥力质量影响的差异及机制,采用分解袋法研究了福建省海岸沙地防护林5种主要森林类型的凋落物生物量动态、分解动态,分析了不同凋落物的初始质量特征,分解过程的失重率、碳氮比、碳磷比、氮磷比特征及分解速率等.结果表明:5种森林类型凋落物生物量为10.08～12.99 t/(hm2·a),月动态差异不大.不同凋落物的初始质量指标差异显著;5种凋落物分解过程的失重率变化均符合Olson模型规律,预测分解95％需要时长分别为:天然次生林3.31 a,尾巨桉4.92 a,厚荚相思5.38 a,木麻黄8.18 a,湿地松13.80 a.分解指数k与凋落物全磷、全氮含量极显著正相关,与碳氮比、纤维素含量极显著负相关;与土壤pH值、有效磷含量极显著正相关.随着分解时间的延长,5种凋落物的碳氮比均呈指数型下降趋势,碳磷比变化规律各异,氮磷比在分解进程中相对稳定.凋落物分解受凋落物初始质量特征、沙土酸性强、养分贫瘠、干燥度高、风速大等因素的综合影响.在防护林经营过程中,应增加混交树种类型,以丰富凋落物种类,还可考虑通过施肥调节土壤碳氮磷比例、pH值等,以达到调控凋落物分解速率、提高沙土"自肥"能力的目的.

We measured the annual net biomass growth, carbon content of each component and soil heterotrophic respiration in four low-efficiency interplanting patterns, i.e., Pinus massoniana stands interplanting Myrica rubra, Sapindus mukurossi, Camellia oleifera and Gardenia jasminoides in Changting County, Fujian Province, with the aim to analyze the effects of interplanting patterns on carbon storage pattern and carbon balance of low-efficiency P. massoniana stand. The ranges of carbon content in different organs of M. rubra, S. mukurossi, C. oleifera, G. jasminoides and P. massoniana were 41.1%-50.1%, 42.2%-50.6%, 45.1%-48.9%, 44.7%-49.6% and 46.1%-51.9%, respectively. Carbon content of the same organ significantly differed among tree species. The pattern of P. massoniana interplanting M. rubra and S. mukurossi had the highest carbon stock and annual net carbon increase reserves, with values of 67.62-68.42 t·hm-2 and 9.21-9.45 t·hm-2·a-1, respectively. Followed by the lower pattern of C. oleifera, G. jasminoides, with values of 31.96-36.24 t·hm-2 and 4.09-4.16 t·hm-2·a-1, respectively. The P. massoniana pure forest was the lowest, with values of 17.01 t·hm-2 and 2.00 t·hm-2·a-1, respectively. Annual flux of soil heterotrophic respiration was following the order of P. massoniana interplanting M. rubra pattern (7.41 t·hm-2·a-1) > P. massoniana interplanting C. oleifera pattern (5.89 t·hm-2·a-1)> P. massoniana interplanting S. mukurossi pattern (5.86 t·hm-2·a-1) > P. massoniana interplanting G. jasminoides pattern (4.95 t·hm-2·a-1) > P. massoniana pure forest (2.45 t·hm-2·a-1). Annual net ecosystem carbon balance of P. massoniana interplanting M. rubra and S. mukurossi patterns were 2.04 and 3.27 t C·hm-2·a-1, showing a "carbon sink" pattern. The net carbon balance in the patterns of P. massoniana interplanting C. oleifera and G. jasminoides along with P. massoniana pure forest were -1.80, -0.80 and -0.45 t C·hm-2·a-1, which expressed a "carbon source" pattern. In the short-term, interplanting with M. rubra or S. mukurossi could improve the carbon income of the low-efficiency P. massoniana stand ecosystem.

为了探讨不同树种对养分贫瘠环境的适应策略,以中国亚热带海岸沙地上5种主要树种(木麻黄Casuarina equisetifolia、厚荚相思Acacia crassicarpa、湿地松Pinus elliottii、尾巨桉Euca-lyptus grandis x E.urophylla和潺槁木姜子Litsea glutinosa)为研究对象,测定成熟叶片和凋落叶中的钾(K)、钙(Ca)、钠(Na)、镁(Mg)、铝(Al)、铁(Fe)、锰(Mn)、铜(Cu)、锌(Zn)9种元素含量,研究相同立地条件下不同树种对不同元素的重吸收率.结果表明:不同树种叶片中K和Na的重吸收率均为正值,木麻黄小枝K和Na重吸收率最高,是典型的"营养保存型"树种.5个树种叶片中Ca、Fe、Mn、Al均为富集,潺槁木姜子叶片中Zn表现为重吸收,尾巨桉叶片中Mg为重吸收率,在其他树种叶片中Mg和Zn均为富集;Cu在非固氮树种中为重吸收,在固氮树种中为富集.5个树种对不同营养元素的吸收具有均衡性,立地条件和树种生物学特性共同影响了不同树种叶片的金属元素含量和重吸收效率.

本研究以福建典型的红壤丘陵山区锥栗(Castanea henryi)园为研究对象,采用随机区组设计,将供试样地分为面积0.3～0.5 hm2的若干试验小区,全园清除自然杂草后,设置撒播鼠茅草(Vulpia myuros,VM)籽、光叶紫花苕(Vicia villosa,VV)籽、黑麦草(Lolium perenne,LP)籽、紫云英(Astragalus simicus,AS)籽和园叶决明(Chamaecrista rotundifolia,CR)籽5种生草栽培,以及清耕(CT)和喷施草甘膦(GS),共7种不同处理,分析7种处理对锥果园土壤理化性质、微生物生物量碳氮和栗果农艺性状等指标的影响.结果 表明:1)各生草栽培处理的土壤总体质量显著高于CT和GS处理(P＜0.05);其中,在0-10cm和10-20 cm两个土层,VM处理的土壤水解性氮含量最高,分别为74.14和54.87 mg·kg-1,微生物生物量碳(MBC)含量也最高,分别为1.42和1.15 g·kg1;LP处理的土壤交换性钙含量最高,分别达到128和93.39 mg·kg-1,镁含量也最高,分别为114.95和66.28 mg·kg-1;VV处理的微生物生物量氮(MBN)含量最高,分别为47.68和30.89 mg·kg-1.(2)生草栽培显著改善了锥栗果实农艺性状,相比CT和GS处理,各生草栽培处理均不同程度地提高了果实中淀粉、可溶性糖、蛋白质、脂肪及磷钾钙镁营养元素的含量;VM处理的锥栗果实横纵径分别达到26.6和33.1 mm,单果质量13.549,果实个头明显增大,且VM处理的锥栗单位面积产量较CT和GS处理分别提高了59.44％、111.25％.(3) Mantel Test检验和随机森林分析表明,MBN、土壤水解性氮和交换性镁既是影响栗果总体农艺性状的关键因子,也是影响锥栗产量的最主要因子.综上,生草栽培可以提高锥果园土壤质量,改善锥栗果实农艺性状,提高锥栗产量,增加栗农收益;其中以VM处理表现最佳,可作为我国南方锥栗园地面管理的优先选择.

Background : Betula fujianensis ( B. fujianensis ), a new Betulaceae species reported in 2008, is endemic and endangered in the Fujian province of China. However, little is known about it, and no special protection measures have been taken. So it is urgent to take some activities for its well conservation. Results : In this study, we systematically described its morphological characteristics, developed a cultivation method, and were the first to report its whole chloroplast genome sequence. We conducted a comparative analysis using its synonymous species ( B. luminifera) and identified its distinct characteristic , especially in bark and leaves. It has serrated leaves covered with glandular punctation and short and rare pubescences, and its bark gradually changes with age from smooth to exfoliate. We also observed that its chlorophyll content substantially changes with age. Furthermore, we also sequenced B. luminifera ’s chloroplast genome sequence, compared it with that of B. fujianensis, and found that gene rpl16 is absent in B. fujianensis . Phylogenetic analysis also showed that B. fujianensis is relatively close to B. luminifera . Conclusions : These observations and chloroplast genome sequence results provide more information about B. fujianensis . The comparative analysis with B. luminifera will provide some clues to different environmental adaptation. The cultivation method make further scientific researches possible, contribute to its good conservation and promote its utilization in afforestation and industrial application in the future.

采用相邻格子法对武夷山黄溪洲常绿阔叶林植物多样性进行调查,分析该群落植物组成及群落植物多样性.结果 表明:该群落分层明显,草本层和层间植物种数较少,共有维管植物41科63属116种,乔木层、灌木层和草本层分别有39、66和11种.乔木层重要值排名前5的植物为少叶黄杞(Engelhardtia fenzlii)、甜槠(Castanop-sis eyrei)、赤楠(Syzygium buxifolium)、米槠(Castanopsis carlesii)和小叶青冈(Cyclobalanopsis m yrsinifolia);灌木层重要值前5位的植物为箬竹(Indocalamus tessellatus)、少叶黄杞、黄丹木姜子(Litsea elongata)、赤楠和绒毛润楠(Machilus velutina);草本层重要值前5的植物为里白(Hicriopteris glauca)、狗脊(Woodwardia japonica)、常春油麻藤(Mucuna sem pervirens)、莎草蕨(Schizaea digitata)和长序链珠藤(Alyxia yunkuniana).灌木层数量、多样性指数和丰富度指数均居首位;乔木层和灌木层优势种突出,植物种分布不均匀;草本层植物种数少,均匀度指数最大.

[目的]充分发挥海岸带木麻黄林地的生产潜力,为福建木麻黄人工林林分质量精准提升提供理论基础.[方法]基于福建省平潭岛海岸带木麻黄林样地调查和土壤分析,通过文献查阅,结合相关性分析筛选出影响木麻黄树高的主要养分因子,利用主成分分析方法对各样地多种土壤养分指标进行降维综合评价,并用聚类分析对所选样地土壤进行分级,最后结合立地因子的类别划分,运用数量化理论Ⅰ方法对木麻黄林立地条件进行立地质量评价和类型划分.[结果]海岸沙地木麻黄平均木树高与土壤有效磷呈极显著正相关(P<0.01);影响木麻黄生长的5个立地因子依贡献度大小分别为坡度(0.4602)>风向(0.4093)>土壤养分(0.2921)>海拔(0.2861)>土壤厚度(0.2856),其中坡度和风向与优势木高偏相关系数达极显著水平(P<0.01),海拔、土壤厚度和土壤养分皆达到显著水平(P<0.05);平潭岛海岸沙地木麻黄林立地评价结果可分为5个等级,其中Ⅱ级(较适宜)占比最大,为43.1％,其后依次为Ⅳ级(勉强适宜)、Ⅲ级(适宜)、Ⅴ级(不适宜)和Ⅰ级(最适宜),适宜、较适宜和最适宜等级总占比66.7％.[结论]通过立地评价与类型划分,认为平潭岛海岸沙地大部分立地条件较适合木麻黄生长,营造木麻黄林应选择坡度<15°、海拔高度10～100 m的立地条件,但海岸沙地土壤养分较为贫瘠,以低、贫养分为主,沿海沙地木麻黄林的生长主要受磷限制,在造林和抚育中应注意磷肥的补充.