荒漠草原植物在氮磷添加下叶功能性状特征及其可塑性  

Leaf functional trait characteristics and plasticity of desert steppe plants under nitrogen and phosphorus addition

作　　者：鲍平安 邱开阳[1,2,3,4] 黄业芸 王思瑶 崔璐瑶 骆欣怡 杨云涛 谢应忠[1,2,3,4] BAO Ping-an;QIU Kai-yang;HUANG Ye-yun;WANG Si-yao;CUI Lu-yao;LUO Xin-yi;YANG Yun-tao;XIE Ying-zhong(College of Forestry and Prataculture,Ningxia University,Yinchuan 750021,China;Ningxia Grassland and Animal Husbandry Engineering Technology Research Center,Ningxia University,Yinchuan 750021,China;Key Laboratory for Model Innovation in Forage Production Efficiency,Ministry of Agriculture and Rural Affairs,Ningxia University,Yinchuan 750021,China;Key Laboratory of Land Degradation and Ecological Restoration in Northwest China,Ningxia University,Yinchuan 750021,China)

机构地区：[1]宁夏大学林业与草业学院,宁夏银川750021 [2]宁夏大学宁夏草牧业工程技术研究中心,宁夏银川750021 [3]宁夏大学农业农村部饲草高效生产模式创新重点实验室,宁夏银川750021 [4]宁夏大学西北土地退化与生态恢复国家重点实验室培育基地,宁夏银川750021

出　　处：《草业学报》2024年第3期97-106,共10页Acta Prataculturae Sinica

基　　金：高层次留学人才回国资助项目(人社厅函[2019]160号);宁夏重点研发项目(引才专项)(2019BEB04011)资助。

摘　　要：探究荒漠草原植物在N、P添加下叶功能性状特征及其变异,对揭示植被对环境的响应机制至关重要。以宁夏盐池县荒漠草原植物群落为研究对象,分析了N、P添加对植物群落叶片形态和化学性状的影响。结果表明:植物群落叶片氮磷比<14,表明研究区植物生长受到N限制,P添加对植物群落叶片功能性状无显著影响,N+P共同添加显著增加了叶片碳磷比,N添加下植物群落叶面积、比叶面积、叶组织密度和叶片氮含量显著上升,反映了植物在环境的变化下采取了较快的养分循环策略;根据可塑性指数排序结果可知,植物群落叶面积、比叶面积、叶片干物质含量、叶组织密度、叶片碳含量和叶片氮含量为响应N、P添加的敏感性状(PI>0.5),其中变异性较大的性状为叶面积、比叶面积和叶组织密度,表明植物群落主要通过改变自身形态来应对环境的变化;相关性分析结果表明,植物群落叶片性状之间存在显著的相关性,并且表现出应对养分环境变化的协同作用。本研究为预测植物和生态系统对全球变化因素的反应提供了理论依据,对探讨区域植被分布、恢复进程至关重要。Investigating the changes in the functional traits of desert grassland plants under nitrogen(N)and phosphorus(P)addition is crucial for uncovering the mechanisms by which vegetation respond to the environment.In this study,we analyzed the effects of N and P addition on the leaf morphological and chemical traits of the plant community in the desert grassland of Yanchi County,Ningxia.The results showed that the N∶P ratio of the leaf in the plant community was<14,indicating that plant growth in the study area was restricted by N.The addition of P had no significant effect on the leaf functional traits of the plant community.However,N+P addition significantly increased the C/P ratio of the leaf.The addition of N significantly increased the leaf area,specific leaf area,leaf tissue density,and leaf N concentration in the plant community,reflecting that plants adopted a faster nutrientcycling strategy under changing environmental conditions.Based on plasticity index(PI)rankings,the leaf traits that were sensitive to N and P addition were leaf area,specific leaf area,leaf dry matter content,leaf tissue density,leaf carbon,and leaf nitrogen content(PI>0.5),with leaf area,specific leaf area,and leaf tissue density showing larger variations.This indicates that the plant community mainly responds to environmental changes by altering its own morphology.The results of correlation analyses showed that there were significant correlations among leaf traits of the plant community,indicative of a synergistic response to changes in nutrient availability.The results of this study provide a theoretical basis for predicting the responses of plants and ecosystems to global climate change,and are crucial for understanding the regional distribution of vegetation and for developing restoration strategies.

关 键 词：荒漠草原 养分添加 叶片功能性状 群落加权平均值 

分 类 号：S812[农业科学—草业科学]