摘要
研究荒漠生态系统中乔木、灌木和草本叶片生态化学计量特征及其随季节变化的规律,旨在阐明不同生活型植物生长发育过程中生态化学计量特征动态平衡及其差异,为荒漠生态系统的保护与管理提供理论依据。选择塔里木盆地南缘绿洲-沙漠过渡带内不同生活型8种植物,在生长季的4—9月连续进行叶片采集,分析叶片C、N、P含量及其计量比在整个生长季的变化。结果表明:(1)整体上,8种植物叶片C含量的季节变化不大,N、P含量在生长初期最高,之后逐步下降,体现了明显的稀释作用,而植物叶片的C∶N、C∶P和N∶P在整个生长季内的变化规律不一致;(2)综合分析8种植物叶片C、N、P含量及其计量比值在整个生长季节内的变异,变异系数由大到小排序为:P(32.39%)>C∶P(25.67%)>N(20.96%)>N∶P(20.42%)>C∶N(19.83%)>C(6.49%);(3)植物叶片C含量的变异主要受物种和生活型的影响,N、P含量及C∶N、C∶P的变异受物种和生长季的影响最大,而N∶P的变异受到生长季与物种的交互影响大于生长季的影响;(4)8种植物叶片N、P含量间存在极显著的正相关关系(P<0.001);P含量则与N∶P间呈现显著负相关(P<0.001),而N含量与N∶P间无显著相关性(P>0.05)。绿洲-沙漠过渡带8种植物叶片碳、氮、磷含量及其化学计量比在生长季因物种而不同,它们在生长季内的变异系数在物种间也存在差异,植物生长更容易受到N元素的限制。
The main purpose of this study was to determine leaf ecological stoichiometric characteristics and variation pattern of trees,shrubs and herbaceous in desert ecosystem.The dynamic balance and differences in ecological stoichiometric characteristics in different life forms during their growth season were elucidated.The results from this study will be helpful in supplying theoretical basis for desert ecosystem protection and management.In this study,8 species of plants with different life forms were selected from the oasis-desert transition zone in the southern margin of the Tarim Basin,and their leaves were collected continuously from April to September in the growing season to analyze the changes of C,N,and P contents and their econometrical ratios in the leaves during the whole growing season.The results showed that:(1)On the whole,the seasonal variation of C content in leaves of 8 species was not significant.The contents of N and P were the highest in the early growth period and then gradually decreased,which reflected the obvious dilution effect.However,the changes of C∶N,C∶P and N∶P in leaves of the 8 species were inconsistent in the whole growing season.(2)We comprehensively analyzed the variation of C,N,P and their econometric ratios of 8 plant leaves in the whole growing season.The coefficient of variation was ranked from large to small as follows:P(32.39%)>C∶P(25.67%)>N(20.96%)>N∶P(20.42%)>C∶N(19.83%)>C(6.49%).(3)The variation of C content in plant leaves was mainly affected by species and life form,and the variation of N and P content and C∶N and C∶P were most affected by species and growing season,while the variation of N∶P was more affected by the interaction between growing season and species than by growing season.(4)There was a significantly positive correlation between N and P contents in leaves of 8 species(P<0.001).There was a significantly negative correlation between P content and N∶P(P<0.001),but no significant correlation between N content and N∶P(P>0.05).In the oasis-desert transition zone,the contents of carbon,nitrogen and phosphorus and their stoichiometric ratios in leaves of the 8 plants varied from species to species during the growing season,and their coefficient of variation in the growing season was also different among species,and plant growth was more likely to be restricted by N element.
作者
加沙来提·阿塔吾拉
鲁艳
张波
张志浩
李利
JIASHALAITI Atawula;LU Yan;ZHANG Bo;ZHANG Zhihao;LI Li(College of Ecology and Environment,Xinjiang University,Urumqi 830046,China;Xinjiang Desert Plant Roots Ecology and Vegetation Restoration Laboratory,Xinjiang Institute of Ecology and Geography,Chinese Academy of Sciences,Urumqi 830011,China;State Key Laboratory of Desert and Oasis Ecology,Xinjiang Institute of Ecology and Geography,Chinese Academy of Sciences,Urumqi 830011,China;Cele National Station of Observation and Research for Desert-Grassland Ecosystem,Cele 848300,China)
出处
《生态学报》
CAS
CSCD
北大核心
2024年第19期8605-8616,共12页
Acta Ecologica Sinica
基金
兵团重点领域科技攻关项目(2023AB017-02)
中国科学院“西部青年学者”项目(2021-XBQNXZ-018)
第三次新疆综合科学考察项目子课题(2021xjkk030401)。
关键词
荒漠植物
生态化学计量特征
季节变化
生活型
叶片
desert plants
ecological stoichiometric characteristics
seasonal variation
life form
leaves
