3种高寒草甸土壤CO_2通量及碳密度差异变化  

Variation of soil CO_2 flux and soil carbon density of 3 alpine meadows

作　　者：魏巍[1] 曹文侠[1] 张小娇[1] 

机构地区：[1]甘肃农业大学草业学院/草业生态系统教育部重点实验室/甘肃省草业工程实验室/中-美草地畜牧业可持续发展研究中心,甘肃兰州730070

出　　处：《草原与草坪》2013年第3期31-35,共5页Grassland and Turf

基　　金：博士点基金(20106202120004);草业生态系统重点实验室课题(CYZS-2011007);现代农业产业技术体系CARS-35资助

摘　　要：在祁连山东缘选择珠芽蓼草甸(P)、针茅草地(S)、杜鹃灌丛草甸(R)3种高寒草甸,利用LI-8100A土壤CO2通量自动测定系统与室内分析相结合的研究方法,分析了土壤有机碳密度、碳通量的动态及其与环境因子的关系。结果表明:不同植被类型的土壤有机碳密度差异显著,大小顺序为R>S>P,随土壤深度的增加,土壤碳密度降低;土壤CO2通量大小顺序为S>P>R,样地P、S呈单峰变化。峰值均出现于14∶00～15∶00;土壤CO2通量与近地面的空气湿度、碳含量显著负相关,与土壤温度、近地大气温度显著正相关,与土壤含水量无明显相关性。Three different vegetation types of alpine medow, including Polygonum meadow （P）, Stipa grass land （S） and Rhododendron shrub meadow （R） were selected in eastern Qilian Mountains to study the soil or ganic carbon density,soil CO2 flux and its relationships between environment factors by using LI-8100 and labo- ratory analysis. The results showed that the soil organic carbon density was significantly different among differ- ent vegetation types,the order was R〉S〉P. And it was lower along with the increase of soil depth. The order of soil CO2 flux was S〉P〉R. P and S showed a single peak pattern and the peaks appeared between 14：00 and 15：00. Soil CO2 flux showed a significant negative correlation with air humidity of ground proximity and carbon content,and it showed a significant positive correlation with soil temperature and air temperature of ground proximity. It was not correlated with soil water content.

关 键 词：高寒草甸 土壤呼吸 土壤有机碳 气候因子 土壤温度 

分 类 号：S152.8[农业科学—土壤学]