论文部分内容阅读
护田林是按照一定规格营造的方格状林带.护田林营造区分以下三个类型:严重风沙区:土壤以沙土和粉沙土为主,瘠薄干旱,肥力极差.冬、春季易遭风剥沙压,秋季作物常因大风而倒伏、撸粒,产量低而不稳.一般风沙区:土壤以黑土、沙壤土为主,低洼易涝地区还有盐碱土分布.气候干旱多风,春季风蚀表土,秋季大风常使作物倒伏、撸粒,造成减产.风害区:土壤以棕色森林土和褐色土为主,肥力较高,风害较轻.营造护田林,应根据不同类型区的特点确定有关营造技术:
The Tianlin forest is a square-shaped forest belt constructed according to certain specifications and is divided into three types as follows: Severe aeolian areas: sandy soil and silt are the main types of soil, infertile infertility is poor and infertile in winter and spring The autumn and autumn crops often lurk due to strong winds, and the grain yield is low and unsteady.General wind and sand area: the soil is dominated by black soil and sandy loam, and there are saline-alkali soil in the low-lying flood-prone areas.The climate is arid and windy, Autumn wind often lodging crops, grain, resulting in reduced production. Wind damage area: the soil is mainly brown forest soil and brown soil, high fertility, less wind damage .To create protection forest, should be based on the characteristics of different types of areas to determine the relevant Create technology