摘要
蒸发是土-气界面上水分损失和水循环的重要组成因子,受到环境温湿度条件的强烈影响。为阐明高原背景条件下土壤蒸发速率对大气温湿度因子的响应,以西藏林芝农田裸地为研究对象,采用土壤H2O/CO2通量仪自动测定土壤表面水分蒸发速率、近地层气温、大气湿度等因子,并通过相关性分析研究变量间的相关关系。结果表明,土壤水分蒸发速率表现为单峰型日变化特征,最大值出现在午后14:00-15:00时,最小值出现在夜间,气温和大气湿度也表现相似的变化特征。土壤蒸发速率与气温之间呈极显著正相关关系(R>0.9,P<0.001),近地层大气湿度对土壤蒸发速率有极显著的正响应关系(R>0.7,P<0.001)。
Soil evaporation is a key factor of moisture migration and water cycling at the soil-air interface and strongly influenced by temperature and humidity. To elucidate the relationships between soil evaporation rate and air temperature and humidity, the air temperature and humidity and soil evaporation rate at Linzhi farmland were studied using the H20/CO2 flux instrument. The relationships of soil evaporation and air temperature and humidity were estimated by correlation analysis. Results showed that the diurnal variation of soil evaporation rate could be expressed as a single-peak curve, and the peak value and valley value of Re appeared at 14：00-15：00 and early morning respectively. The air temperature and humidity variations were the same to Re. The evaporation rate had a significantly positive correlation to the air temperature （R〉0.9, P〈0.001） and air humidity （R〉0.7, P〈0.001）.
出处
《生态科学》
CSCD
北大核心
2013年第2期241-245,共5页
Ecological Science
基金
国家自然科学基金项目(41161052
41061033)
西北农林科技大学黄土高原土壤侵蚀与旱地农业国家重点实验室基金项目(10501-292)
西藏自治区自然科学基金项目
西藏农牧学院青年科学基金项目
