苜蓿草地土壤呼吸及其对环境响应的研究  

Soil Respiration of Alfalfa Fields in the Agro-pastoral Ecotone of Northern China and Its Environment on Responses

作　　者：庞莹莹[1] 邓波[1] 张英俊[1] 杨世超[1] 马学敏[1,2] 刘蒙[1] 

机构地区：[1]中国农业大学动物科技学院草业科学系,北京100193 [2]吉林农业大学园艺学院,吉林长春130118

出　　处：《草地学报》2011年第3期432-437,共6页Acta Agrestia Sinica

基　　金：农业部公益性行业(农业)项目(nyhyzx07-022);农业部现代产业技术体系资助

摘　　要：采用LI-8100对河北沽源牧场地区3年生苜蓿（Medicago sativa L.）草地生长季土壤呼吸速率日动态以及季动态进行测定,分析了土壤呼吸速率与土壤温度、土壤湿度和大气辐射的相关性。结果表明：苜蓿草地的土壤呼吸日动态呈单峰曲线,各观测日的最小值分别为3.102,2.071,4.655,4.52,3.355μmol.m-2.s-1,出现在每天8：00-9：00和18：00-19：00之间,相对应的最大值分别是4.934,3.034,6.948,5.682,4.823μmol.m-2.s-1,出现在13：00-16：00之间。土壤呼吸速率日动态与5 cm土壤温度的相关性最大,R2的值为0.2722~0.8214（P〈0.05）,与10 cm土壤温度有一定的相关性,与20 cm土壤温度相关性不大。土壤呼吸季动态呈不规则单峰曲线,最小值是2.48μmol.m-2.s-1,出现在6月26日,最大值是5.79μmol.m-2.s-1,出现在7月24日。土壤呼吸季动态与5,10,20 cm深度的土壤温度均无相关性,与5,10,20 cm深度土壤湿度均有极相关关系（P〈0.01）,与太阳辐射无相关性。Both diurnal and seasonal dynamics of soil respiration in three-year old alfalfa（Medicago sativa L.）filed were measured using LI-8100 Automated Soil CO2 Flux System.The relationships between soil respiration,soil moisture and solar radiation were analyzed.Results indicated that the diurnal dynamics of soil respiration presented a single peaked curve.The lowest value was 3.102,2.071,4.655,4.52,3.355 μmol·m-2·s-1 appearing at 8：00-9：00 or 18：00-19：00 for each observed day,respectively.And the highest value was 4.934,3.034,6.948,5.682,4.823 μmol·m-2·s-1 appearing at 13：00-16：00.Seasonal dynamic of soil respiration showed an irregular single peak with the minimum 2.48 μmol·m-2·s-1 value at June and the maximum 5.79 μmol·m-2·s-1 value at July.The diurnal dynamics of soil respiration had a significant correlation to the soil temperatures of 5cm depth and R2 values were 0.2722～0.8214（P0.05）.There is no significant correlation between the diurnal dynamics of soil respiration and the soil temperature of 20 cm depth（P0.05）.The seasonal dynamics of soil respiration had no significant correlation to solar radiation and the soil temperature at 5,10 and 20 cm depth（P0.05）.However,there was a significant correlation to the soil moisture at 5,10 and 20 cm depth（P0.01）.

关 键 词：苜蓿草地 土壤呼吸速率 环境响应 

分 类 号：S154[农业科学—土壤学]