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内蒙古的黄土丘陵分布区,降水量少,蒸发量大,植被稀疏矮小,水土流失严重,土壤含水率为5%,造林成活困难,成活率在40%以下,造林质量差,若不配以水保工程措施,则不易成功。因此,必须进行水保工程设计。现将水保工程设计的方法及造林应注意的问题作以介绍。造林配以水保工程后,提高了造林质量,经调查,1991、1992、1993年的造林成活率均为85%。工程措施、生物措施完成后的第五年,林草覆盖率可达70%以上,基本上改变了生态环境,经济效益有明显提高。以凉城县双古城乡小夭沟行政村为例,全村总面积2288公顷,其中造林面积412公顷,森林覆盖率为18%,1983年林业收入近万元、人均纯收入319元,而1993年林业收入达到11万元、人均纯收入700元,人民生活有显著改善。
Inner Mongolia loess hilly distribution area, less precipitation, evaporation, thin sparse vegetation, soil erosion is serious, the soil water content is 5%, afforestation survival difficulties, survival rate below 40%, afforestation quality is poor, if not accompanied by water and soil conservation Engineering measures are not easy to succeed. Therefore, we must carry out water conservancy project design. Now the design of the water conservancy project and afforestation should pay attention to the problem to be introduced. Afforestation combined with water and soil conservation project, improve the quality of afforestation, after investigation, 1991, 1992, 1993 afforestation survival rate was 85%. In the fifth year after the engineering measures and biological measures are completed, the forest and grass coverage rate can reach over 70%, basically changing the ecological environment and obviously improving economic benefits. Take Liangcheng County Urban and Rural Xiaoyaogou Administrative Village as an example. The total area of the village is 2,288 hectares, including afforestation area of 412 hectares and forest coverage rate of 18%. In 1983, the forestry income was nearly 10,000 yuan and the per capita net income was 319 yuan. In 1993, forestry income reached 110,000 yuan and net income per capita was 700 yuan. People’s living standards improved significantly.