短期封育对滇西北亚高山草甸土壤呼吸速率的影响  

Effects of Short-term Enclosure on Soil Respiration Rate of Sub-alpine Meadow in Northwestern Yunnan

作　　者：欧阳青[1] 代微然[1] 任健[1] 袁福锦[2] 宋丽梅[1] 

机构地区：[1]云南农业大学草业科学系,昆明650201 [2]云南省草地动物科学研究院,昆明650212

出　　处：《中国农学通报》2014年第16期7-11,共5页Chinese Agricultural Science Bulletin

基　　金：公益行业专项"青藏高原社区天然草地保护与合理利用技术研究与示范"(201203006)

摘　　要：为了认识短期封育对滇西北亚高山草甸土壤呼吸速率、土壤温度、土壤水分等方面的影响,对香格里拉县小中甸镇和平村封育2年后的冬季牧场开展了研究。结果表明,与自然放牧的草甸相比,短期封育不但显著提高了春季和夏季的土壤呼吸速率,而且明显提高了亚高山草甸的植被盖度。封育对春季的土壤温度没有明显影响(P>0.05),相反,显著地提高夏季的土壤温度(P<0.01)。另外,研究发现,在短期封育下,无论是春季还是夏季,亚高山草甸的土壤呼吸速率、土壤温度和土壤含水量两两之间的相关性不显著;而自然放牧状态下,春季的土壤温度和土壤含水量之间存在显著的负相关(P<0.05)。In our experiment, we study soil respiration, soil temperature and soil water content as well as vegetation coverage of sub-alpine meadow in northwestern Yunnan Province after two-year enclosure in order to learn short-term enclosure effects. The results showed that short-term enclosure not only significantly increased the soil respiration rate in both spring and summer, but also significantly improved vegetation coverage when compared with the control. In the spring, short-term enclosure had no significant effect on soil temperature （P〉0.05）, whereas it was significantly improved in summer （P〈0.01）. According to correlation analysis between the soil respiration, soil temperature and soil water content, no significance was observed in both spring and summer after short-term enclosure. However, significant negative correlation was observed between soil temperature and soil water content of alpine meadow without fencing （P〈0.05）.

关 键 词：封育 亚高山草甸 土壤呼吸速率 土壤含水量 

分 类 号：S812.5[农业科学—草业科学]