不同放牧强度对天山北坡草原草地生态系统碳交换速率的影响  

Effects of Different Grazing Intensity on the Rate of Meadow Steppe Carbon Sequestration in the North Slope of Tianshan Mountains

作　　者：丁娓[1] 孙霞[1] 贾阳阳[1] 秦鹏[1] 胡毅[1] 金俊香[1] 

机构地区：[1]新疆农业大学草业与环境科学学院,乌鲁木齐830052

出　　处：《新疆农业大学学报》2014年第3期197-202,共6页Journal of Xinjiang Agricultural University

基　　金：新疆草地资源与生态重点实验室开放课题(XJDX0209-2011-03);新疆维吾尔自治区土壤学重点学科建设项目

摘　　要：以天山北坡羊茅+杂类草草原草地为研究对象,于2013年6月至9月采用模拟放牧方式设置休牧、轻度放牧、中度放牧、重度放牧4个处理,利用静态箱法测定草地生态系统碳交换速率,研究不同放牧强度对草原草地碳交换速率的影响。结果表明,休牧处理下,各月10:00达到碳吸收最大值;9:00至20:00为碳吸收,22:00至次日7:00为碳释放;重度放牧处理下全天为碳释放。各处理对碳交换速率的影响程度表现为重度放牧>中度放牧>轻度放牧;休牧和轻度放牧的碳吸收量远大于中度放牧和重度放牧,休牧和轻度放牧表现为碳汇,中度放牧和重度放牧表现为碳源。季节变化中碳吸收量8月最大,9月最小;7月和8月表现为碳汇,6月和9月表现为碳源。In this paper,use the Northern Tianshan Mountain Festuca ovina and forbs meadow steppe were used as the research obj ect,by using the methods of simulated grazing,set hugh grazing,light grazG ing,moderate grazing,heavy grazing,four processes altogether,by utilizing the method of the static chamG ber to determine the carbon exchange rate of grassland ecosystem,to study the effect of different grazing intensity on the rate of meadow steppe carbon sequestration.The results indicated that：from June to SepG tember,2013,hugh grazing,carbon absorption was achieved at 10：00 maximum;9：00 to 20：00 for carbon sequestration,22：00 at 7：00 PM for carbon release;Under heavy grazing treatment for carbon release throughout the day.The effect of grazing intensity on the rate of carbon sequestration was as follows：heavy grazing＆gt;moderate grazing＆gt;light grazing;Rest grazing and light grazing carbon uptake is far greater than in that moderate grazing and heavy grazing,Rest grazing and light grazing were performance for carbon seG questration,and moderate grazing and heavy grazing were performance for carbon source.Seasonal variation in carbon uptake in August,the largest minimum in September;July and August were performance for carG bon sequestration,June and September were performance for carbon source.

关 键 词：放牧强度 碳交换速率 碳吸收 碳释放 

分 类 号：S812[农业科学—草业科学]