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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 regularities of precipitation, relative humidity, soil moisture, air temperature, ground temperature and other hydrothermal factors were studied in the Pinus tabulaeformis plantation. The results showed that the canopy and litter layer had strong interception effect on precipitation, and the forest land obtained only 70% of the forest The average monthly mean relative humidity was lower in the forest than in the forest, and the average relative humidity in the forest was 6.0% lower than that in the forest; the soil moisture in the forest land was bad and the water resilience was poor; In contrast, the annual mean temperature was higher in the forest than in the forest; the soil temperature and its difference in the forest were lower than those in the forest, and the influence of the litter layer on the soil temperature was obvious.