摘要
基于中国国家生态系统观测研究网络的7个森林和10个农田生态系统观测研究站的定位调查数据,本文对中国地带性森林和农田生态系统各个组分的碳(C)、氮(N)、磷(P)含量及其化学计量学特征进行了研究。结果表明:1)森林生态系统各组分的N和P含量大小排序均为叶>凋落物>枝>根>茎>土壤,植被的各器官和凋落物的C含量明显高于土壤C含量。森林生态系统不同组分的C∶N和C∶P的大小排序均为茎>根>枝>凋落物>叶>土壤;植被的各器官及凋落物的N∶P也高于土壤。2)在农田生态系统中,作物各器官的C含量相近,而籽粒的N和P含量明显高于其他组分;各组分C∶N、C∶P和N:P的大小排序均表现为茎≈叶≈根>籽粒>土壤。3)森林生态系统植被的C∶N∶P为3582∶27∶1,土壤的C∶N∶P为111∶8∶1;农田生态系统植被的C∶N∶P为740∶15∶1,土壤的C∶N∶P为26∶3∶1。本研究以地带性生态系统为研究对象,探讨生态系统及其各组分的C-N-P化学计量特征,增加了对生态系统尺度元素化学计量特征的科学认识,为进一步认识中国区域生态系统元素化学计量关系的空间变异规律提供基础数据。
Carbon （C）,nitrogen （N） and phosphorus （P） stoichiometry in Chinese zonal forest and farmland ecosystems were studied based on the survey data of 7 forest ecosystem stations and 10 farmland ecosystem stations in Chinese National Ecosystem Observation and Research Network （CNERN）.Data collected include：comprehensive observation field sample information in ecosystem observation station,biomass of each organ on vegetation layer in observation field,litter standing crop,mineral elements content （including C,N and P） of different organs of each layers＇ dominant plants,the mineral elements content of litter,nutrient content and soil bulk density of each soil layer.The results showed that the N and P contents of different components in forest ecosystems is ordered as leaf＞litter＞branch＞root＞stem＞soil,and the C content of different organs of plant and litter is higher than that of soil.The orders of C： N and C： P are both stem＞root＞branch＞litter＞leaf＞soil,and the N： P of different organs of vegetation and litter are all higher than that of soil.In farmland ecosystems,the C contents of different organs of crop are similar,and the N and P contents of seed are highest in all components.The orders of C：N value,C：P value and N：P value are all stem ≈ leaf ≈ root＞seed＞soil.Moreover,the C：N：P value of vegetation and soil in forest ecosystems are 3582：27：1 and 111：8：1 respectively,and those in farmland ecosystems are 740： 15：1 and 26： 3：1 respectively.Chinese zonal ecosystems as research subjects,this study explores C-N-P stoichiometric characteristics of ecosystem and its components,which not only increases scientific understanding of ecosystem-scale elements stoichiometry but also provides basic data for a better understanding of spatial variability of Chinese regional ecosystem elements stoichiometry.
出处
《第四纪研究》
CAS
CSCD
北大核心
2014年第4期803-814,共12页
Quaternary Sciences
基金
环保公益性行业科研专项项目(批准号:201209028)
中国科学院战略性先导科技专项项目(批准号:XDA05050702和XDA05050602)共同资助
关键词
生态系统
生态化学计量
森林
农田
ecosystem
ecological stoichiometry
forest
farmland
