毛乌素沙地南缘不同植被类型生态化学计量特征  

Ecological stoichiometry of different vegetation types in the southern margin of Mu us Sandy Land

作　　者：郑浩浩 易文利[1,2] 田苗[1] 冯诗格 ZHENG Hao-hao;YI Wen-li;TIAN Miao;FENG Shi-ge(College of Geography and Environment, Baoji University of Arts and Sciences, Baoji 721013, Shaanxi, China;Shaanxi Key Laboratory of Disaster Monitoring and Mechanism Simulation, Baoji 721013, Shaanxi, China)

机构地区：[1]宝鸡文理学院地理与环境学院,陕西宝鸡721013 [2]陕西省灾害监测与机理模拟重点实验室,陕西宝鸡721013

出　　处：《宝鸡文理学院学报（自然科学版）》2022年第1期74-79,102,共7页Journal of Baoji University of Arts and Sciences(Natural Science Edition)

基　　金：国家自然科学基金项目(41771048);陕西省科技厅计划项目(2015JQ4114);陕西省重点学科自然地理学联合资助;宝鸡市科技计划项目(2018JH-15);宝鸡文理学院校级项目(YJSCX20YB27)。

摘　　要：目的研究毛乌素沙地南缘生态恢复过程中4种不同植被类型(樟子松、花棒、柠条和沙柳)叶片、凋落物、土壤C,N,P含量及其生态化学计量特征,为改善生态环境提供理论依据。方法采用野外调查和室内分析测定样品中C,N,P含量。结果樟子松叶片与凋落物C含量最高,N,P含量最低,叶片和凋落物C/N,C/P表现为乔木高于灌木;柠条土壤C,N,C/P,N/P与其他3种植被类型呈显著差异(P<0.05),叶片C与土壤C,N,C/P,N/P呈显著负相关,叶片N和N/P与土壤C,N,C/N,C/P,N/P呈显著正相关。结论生态恢复过程中,植物生长受N的限制,灌木生长速度大于乔木,对土壤养分有明显的累积作用。Purposes—To study the content of C,N and P in leaves,litter and soil and ecological stoichiometric characteristics of four different vegetation types(Pinus sylvestris,Hedysarum scoparium,Caragana korshinskii and Salix psammophila)during ecological restoration in the southern margin of Mu us Sandy Land,and to provide theoretical basis for scientific improvement of fragile ecological environment in this area.Methods—The content of C,N and P in samples was determined by field investigation and laboratory analysis.Result—The content of C in leaves and litter of Pinus sylvestris was the highest,while the content of N and P was the lowest,the content of C/N and C/P in the leaf and litter of trees was higher than those of shrubs,the content of C,N,C/P and N/P in Caragana korshinskii soil was significantly different from those of the other three vegetation types(P<0.05).The content of C in leaves was significantly negatively correlated with the content of C,N,C/P and N/P in soil,the content of N and N/P in leaves was positively correlated with the content of C,N,C/N,C/P and N/P in soil.Conclusion—In the process of ecological restoration,plant growth was limited by the content of N,and the growth rate of shrubs was higher than that of trees,which had an obvious accumulation effect on soil nutrients.

关 键 词：毛乌素沙地 生态恢复 化学计量 耦合特征 

分 类 号：S79[农业科学—林木遗传育种] S714.5[农业科学—林学]