塔里木河中下游盐碱地2种沙枣林植物-土壤碳氮磷生态化学计量特征  

Ecological Stoichiometry of C,N,P of Plant-Soil between two Elaeagnus angustifolia Forests in Saline-Alkaline Land in the Middle and Lower Reaches of Tarim River

作　　者：聂羽伶 罗青红 何苗 张兆祥 NIE Yuling;LUO Qinghong;HE Miao;ZHANG Zhaoxiang(College of Forestry and Landscape Architecture,Xinjiang Agricultural University,Urumqi 830052;Institute of Afforestation and Sand Control,Xinjiang Academy of Forestry,Urumqi 830063)

机构地区：[1]新疆农业大学林学与风景园林学院,乌鲁木齐830052 [2]新疆林业科学研究院造林治沙研究所,乌鲁木齐830063

出　　处：《植物研究》2025年第1期45-56,共12页Bulletin of Botanical Research

基　　金：新疆维吾尔自治区自然科学基金重点项目(2022D01D46)。

摘　　要：新疆盐碱地广阔,明晰新疆乡土抗旱耐盐碱的沙枣(Elaeagnus angustifolia)各器官-土壤间碳、氮、磷化学计量循环特征,对于促进塔里木河中下游荒漠盐碱地植被构建和生态修复具有重要意义。以塔里木河中下游胡颓子属沙枣林植物(大果沙枣(E.moorcroftii)、沙枣)为对象,分析林内2种树种不同器官(叶、枝、根)和土壤的化学计量特征及其相互关系。结果表明:(1)沙枣林植物(大果沙枣、沙枣)叶片碳(C)、氮(N)、磷(P)的平均质量分数分别为424.36~484.40 g⋅kg^(-1)、33.83~38.71 g⋅kg^(-1)、1.50~2.20 g⋅kg^(-1),表现为C、N适中、P略低,且大果沙枣和沙枣的N∶P(17.64、22.82,质量比,下同)均大于16,受P限制。(2)沙枣林植物(大果沙枣、沙枣)各器官生态化学计量特征存在显著差异(P<0.05),N、P含量均为叶片最大。(3)沙枣林(大果沙枣、沙枣)土壤各元素含量受土层深度影响明显,表现为沿土壤剖面垂直递减,且呈现一定的表层(0~20 cm)富集现象。0~60 cm土层的C∶N(质量比)、C∶P(质量比)和N∶P分别为17.94、9.32、0.62,土壤N元素矿化能力较弱,氮素缺乏。(4)沙枣林(大果沙枣、沙枣)土壤N、P含量与根N、P含量呈显著正相关(P<0.05),沙枣叶N含量与0~20 cm土壤C、各层N含量呈显著负相关(P<0.05),与土壤P含量呈显著正相关,叶片P含量与各层土壤P含量呈显著正相关,叶片C与土壤C无显著相关(P>0.05)。总体来说,沙枣林植物面对贫瘠、盐碱较重的土壤时,其枝条和根系中贮存养分较少,通常会将养分优先提供给叶片,研究区沙枣林植物地上部主要受P限制,地下部主要受N限制。因此,沙枣林植物整体养分循环受N、P元素限制。The saline and alkaline land in Xinjiang is vast,and clarifying the characteristics of carbon,nitrogen and phosphorus stoichiometric cycles between organs and soil in the native drought-resistant and salinetolerant Elaeagnus angustifolia forests in Xinjiang is of great significance in promoting the construction of desert,saline and alkaline vegetation and ecological restoration in the middle and lower reaches of the Tarim River.The E.angustifolia forests(E.moorcroftii and E.angustifolia)in the lower reaches of Tarim River were taken as materials,and the stoichiometric characteristics of different organs(leaves,branches,roots)and soils of two tree species in the forest and their interrelationships were analyzed,respectively.The results showed that:(1)The average content of carbon,nitrogen,and phosphorus in the leaves of E.angustifolia forests were 424.36-484.40 g⋅kg^(-1),33.83-38.71 g⋅kg^(-1)and 1.50-2.20 g⋅kg^(-1),respectively,and with moderate C and N contents and slightly low P content.The N∶P ratios of E.moorcroftii(17.64)and E.angustifolia(22.82)were higher than 16,indicating the growth limited by P.(2)There were significant differences in ecological stoichiometric characteristics of each organ in the E.angustifolia forests,and the contents of N and P were the largest in leaves.(3)The soil elements content of the E.angustifolia forests were significantly affected by soil depth,showing a vertical decrease along the soil profile and presenting a certain enrichment in the surface layer(0-20 cm).The C∶N,C∶P and N∶P of the 0-60 cm soil layer were 17.94,9.32 and 0.62,respectively,and the mineralization capacity of soil N element was weak,and N was deficient.(4)Soil N and P contents of E.angustifolia forests were significantly positively correlated with root N and P contents(P<0.05),leaf N contents were significantly negatively correlated with 0-20 cm soil C and N contents of each layer(P<0.05),and significantly positively correlated with soil P contents;leaf P contents were significantly and positivel

关 键 词：生态化学计量 盐碱地 沙枣 土壤 器官 

分 类 号：Q948.1[生物学—植物学]