黄土丘陵区油松人工林水热效应的研究

Study on Water and Hest Effect of Artificial Chinese Pine Stands in Loess Hilly Region

研究了黄土丘陵区油松人工林内降水、相对湿度、土壤水分、气温、地温等水热因子的变化规律，结果表明：林冠和枯枝落叶层对降水截留作用强，林地仅获得７０％的林外降水量；月平均相对温度林内均低于林外，年平均相对湿度林内较林外低６．０％；林地土壤水分环境不良，水分恢复能力也较差；林分对各月气温影响程度不同，年平均气温林内高于林外；林内土壤温度及其较差均低于林外，枯枝落叶层对土壤温度影响明显。

The variation pattern of water and heat factors such as rainfall, air relative humidity ,soil water, air temperature and soil temperature was studied in artificial Chinese pine stands ofloess hilly region. The results showed that interception capacity of canopy and litter of Chinesepine to raifall was large,and the throughfall of precipitation into the ground of woodlands wasonly 7 0% of fie1d precipitation;mean monthly relative humidity in the stands was lower thanthat of out the stands,and mean annual relative humidity was 6.0% less than out the stands;soil water environment was bad and its recovery capacity was worse in the woodlands;the degreeof the stands affecting air temperature was different with monthly variation,and mean annual airtemperature in the stands was higher than out the stands;soil temperature in the stands was low-er than out the stands,and litter had obvious influrence on soil temperature.