放牧强度对高寒灌丛草甸土壤CO_2释放速率的影响  

The Rate of Carbon Dioxide Release from Alpine Scrubby Meadow Soil Under Different Grazing Intensity

作　　者：张金霞[1] 曹广民[1] 周党卫[1] 赵新全[1] 

机构地区：[1]中国科学院西北高原生物研究所,西宁810001

出　　处：《草地学报》2001年第3期183-190,共8页Acta Agrestia Sinica

基　　金：国家重点基础研究专项(G1998040800)资助;中国科学院知识创新工程项目(KSCX2-1-07);国家自然科学基金项目(30070147);中国科学院

摘　　要：在中国科学院海北高寒草甸生态系统定位站，研究放牧强度对土壤CO２释放速率的影响及其与环境条件的关系。结果表明，CO２释放速率具有明显的日变化规律，日最大值在12∶00～14∶00h出现，最低值出现于凌晨6∶00～8∶00h。轻牧和重牧区日释放速率分别为7.774±5.577 g·m－２·d －１和6.977±4.947 g·m－２·d－１。CO２释放速率具有明显的季节变化，最大值均出现在7月，而冬季则最低。CO２释放速率的日变化主要受气温和地表温度的制约，与气温和地表温度呈极显著的正相关(P＜0.01)。CO２释放速率的季节动态与气温和地温(0～30cm)呈极显著的正相关(P＜0.01)。放牧使CO2释放速率降低。The fields experiment was conducted at Haibei research station of alpine meadow ecosystem,Chinese Academy of Sciences.The results indicated that:The rate of CO2 release rate occurred obviously daily change,the daily released CO2 were 7.774±5.577g/m２·d(Lightly grazing)and 6.977 ±4.947g/m２d(Heavily grazing)respectively,its release peak was at 12∶00～14 ∶00 and the valley at 6∶00～8∶00 in the morning.There was significant seasonal dynamic of release rate of CO２,maximum value was in July and minimum in winter.The correlated relationship between daily change in rate of CO2 release and air temperature of soil surface temperature was very significant(P＜0.01).The correlation were extreme significant(P＜0.01)between seasonal dynamic of rate of CO2 release and air temperature and soil temperture(0～30cm).Heavily grazing make arte of CO2 release decreased.

关 键 词：释放速率 放牧强度 高寒灌丛草甸 土壤 二氧化碳 

分 类 号：S812.2[农业科学—草业科学]