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我省农区荒山隙地较多,仅水稻产区川西平原可绿化面积占总面积的8—10%,解放28年来,林业得到很大发展,森林复被率比解放初期增加5%左右。为了解森林的有益效能,我们进行了调查观测。一、蓄水保土盐亭县林山公社,1972年造桤柏混交林12,000亩。1975年测定,林地地表迳流比未造林地减少53.6—73.8%,土壤含水量增加15.6—20.0%,表土总流量减少98%。水土流失基本制止,地下水量增加。1972年定井
In our province there are a lot of barren hills, and only the greening area in the western Sichuan plain of the paddy producing area accounts for 8-10% of the total area. Since the liberation for 28 years, the forestry has made great progress and the rate of forest reutilization has increased by about 5% over the early liberation. To understand the usefulness of forests, we conducted surveys and observations. First, water and soil Yuting County Lin Shan commune, in 1972 made 12,800 acres of mixed cypress forest. Measured in 1975, the surface flow rate of forest land decreased by 53.6-73.8% compared with that of the non-afforestation area, the soil water content increased by 15.6-20.0%, and the total surface soil flow decreased by 98%. Soil erosion basically stopped, groundwater increased. Set in 1972