2024年7月19日 星期五
博斯腾湖湖滨湿地优势植物叶片碳、氮、磷化学计量特征的季节动态及其影响因子
Seasonal dynamics of carbon, nitrogen, and phosphorus stoichiometric characteristics of leaves of dominant plants in the lakeside wetland of Bosten Lake and their influencing factors
2022年 第31卷 第5期 页码[9-18]    下载全文[1.1MB]  
摘要

本研究以博斯腾湖湖滨湿地为研究对象,分析了不同季节(春季、夏季和秋季)刚毛柽柳(Tamarix hispida Willd.)、盐地碱蓬〔Suaeda salsa (Linn.) Pall.〕、白刺(Nitraria tangutorum Bobr.)、芦苇〔Phragmites australis (Cav.) Trin. ex Steud.〕和盐穗木〔Halostachys caspica (Bieb.) C. A. Mey.〕5种优势植物叶片碳、氮、磷含量及其化学计量比的变化及其影响因子。结果表明:从5种优势植物的总体看,叶片碳含量、氮含量和磷含量分别为350.27、25.04和1.99 mg·g-1;叶片碳含量变异系数最小(16.89%),叶片磷含量变异系数最大(65.71%)。刚毛柽柳和芦苇叶片碳含量显著(P<0.05)高于白刺、盐穗木和盐地碱蓬,而氮含量和磷含量较低。夏季刚毛柽柳叶片碳含量显著高于春季和秋季,而芦苇和盐地碱蓬叶片碳含量则是在夏季最低;由春季至秋季,5种优势植物叶片氮含量呈递减趋势,碳氮比呈递增趋势,磷含量先降低后升高,碳磷比和氮磷比总体先升高后降低。刚毛柽柳、白刺和芦苇在春季受氮和磷共同限制,在夏季主要受磷限制;盐穗木和盐地碱蓬在春季和夏季受氮和磷共同限制;5种优势植物在秋季均受氮限制。5种优势植物叶片碳含量与土壤因子的相关性不显著(P>0.05),主要受生活型影响。叶片氮含量、磷含量、碳氮比、碳磷比和氮磷比与土壤因子的相关性相对较强,且主要受季节影响。基于以上研究结果,建议在博斯腾湖湖滨湿地生态环境治理和土壤条件改善时可以在夏季施加磷肥,秋季施加氮肥。

Abstract

In this study, the lakeside wetland of Bosten Lake was taken as the research object, and the variations of contents of carbon, nitrogen, and phosphorus and their stoichiometric ratios in leaves of five dominant plants of Tamarix hispida Willd., Suaeda salsa (Linn.) Pall., Nitraria tangutorum Bobr., Phragmites australis (Cav.) Trin. ex Steud., and Halostachys caspica (Bieb.) C. A. Mey. in different seasons (spring, summer, and autumn) and their influencing factors were analyzed. The results show that in terms of overall situations of five dominant plants, contents of carbon, nitrogen, and phosphorus in leaves are 350.27, 25.04, and 1.99 mg·g-1, respectively; the coefficient of variation of leaf carbon content is the smallest (16.89%), while that of leaf phosphorus content is the largest (65.71%). The leaf carbon contents of T. hispida and P. australis are significantly (P<0.05) higher than those of N. tangutorum, H. caspica, and S. salsa, while contents of nitrogen and phosphorus are relatively low. The leaf carbon content of T. hispida in summer is significantly higher than those in spring and autumn, while those of P. australis and S. salsa are the lowest in summer; from spring to autumn, leaf nitrogen contents of five dominant plants show a tendency to decrease, the carbon/nitrogen ratios show a tendency to increase, the phosphorus contents first decrease and then increase, and the carbon/phosphorus ratios and nitrogen/phosphorus ratios first increase and then decrease in general. T. hispida, N. tangutorum, and P. australis are constrained by both nitrogen and phosphorus in spring, and mainly constrained by phosphorus in summer; H. caspica and S. salsa are constrained by both nitrogen and phosphorus in spring and summer; five dominant plants are all constrained by nitrogen in autumn. The correlations of leaf carbon contents of five dominant plants with soil factors are not significant (P>0.05), and are mainly affected by life forms. The correlations of nitrogen contents, phosphorus contents, carbon/nitrogen ratios, carbon/phosphorus ratio, and nitrogen/phosphorus ratios in leaves with soil factors are relatively strong, and are mainly affected by seasons. Based on above results, it is suggested to apply phosphorus fertilizer in summer and nitrogen fertilizer in autumn to improve the ecological environment and soil condition of the lakeside wetland of Bosten Lake.

关键词博斯腾湖; 湖滨湿地; 生态化学计量; 季节动态; 优势植物; 土壤因子
Key wordsBosten Lake; lakeside wetland; ecological stoichiometry; seasonal dynamics; dominant plant; soil factor
作者郁国梁a,b,c, 王军强a,b,c, 马紫荆a,b,c, 刘彬a,b,c, 尤思学a,b,c, 樊佳辉a,b,c
所在单位新疆师范大学: a. 新疆特殊环境物种保护与调控生物学实验室, b. 新疆特殊环境物种多样性应用与调控重点实验室,c. 生命科学学院, 新疆 乌鲁木齐 830054
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基金项目国家自然科学基金地区基金项目(31360039; 32160271)