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辽西地区位于北纬40°21′—42°20′,东经119°—122°,处于大小凌河流域,多为低山丘陵;属大陆性气候,年均气温7.0—9.1℃,绝对最高温42℃,绝对最低温-31.1℃,温差变化剧烈,年均降水量一般为400—600毫米,最少年份在300毫米以下,年蒸发量1,700—1,900毫米,气候异常干旱,年均相对湿度55%,春季平均为44%,最少月份则在20%以下。土壤主要是由各种岩石风化物残积母质、黄土或红土母质发育的淋溶褐土、棕色森林土、褐色土和粗骨土以及西北部少量的碳酸盐褐土,土层一般较薄,腐殖质含量低,地力比较贫瘠。本区主要造林用材树种是油松,且保存面积最大。因此,不断改善油松林的生态条件,
The western Liaoning Province is located in the latitude 40 ° 21’-42 ° 20’N and longitude 119 ° -122 ° E, and is located in the Xiaoling River basin and mostly low hills. It belongs to the continental climate with an average annual temperature of 7.0-9.1 ℃ and an absolute maximum temperature of 42 ℃, the absolute minimum temperature of -31.1 ℃, the temperature changes dramatically, the average annual precipitation is generally 400-600 mm, the minimum in the 300 mm below the annual evaporation of 1,700-1,900 mm, abnormal drought climate, the average relative humidity of 55% The average spring is 44% and the minimum is 20% or less. The soil is mainly composed of leached cinnamon, brown forest soil, brown soil and coarse-grained soil with a variety of rock weathering residue parent material, loess or red soil parent material, and a small amount of carbonate brown soil in the northwestern part of the country. The soil layer is generally thin, Low humus content, poor soil fertility. The main afforested timber species in this area are Pinus tabulaeformis, with the largest preservation area. Therefore, to continuously improve the pine forest ecological conditions,