摘要
东北西部干旱、半干旱地区影响农业、畜牧业发展的关键因子之一是水分。水分在这一地区变化规律是５～６月春旱阶段，７．８、９三个月是土壤水分丰盛期，各层次水分相差不大，１０月至来年２月是土壤储水期。农田防护林的建立减少了蒸发，提高了土壤水分。但距林带不同距离调节水分幅度不同，明显出现水分最佳区和水分低谷区。根据这一规律可以调整种植结构，充分合理的利用土壤水分，为推广节水型农业提供了途径。防护林带的种类、树高、树种及林带间的距离对林网内水分的分配都有较大影响，这一结论为防护林体系的优化提供了科学依据。
n the arid and semi-arid areas of the west part of Northeastern China.one of the key factors to agriculture and animal husbandry is about water. The regularity of soil moisture dymamics in this area could be characterized by a dry spring in May and June, a water-sufficient period from Jul. to Sept. (no significant difference between soil layers), and a water-retaining Period from Oct. to Feb. of the next year.The establishment of shelterbelts decreased transpiration and consequently increased soil moisture; but the effect varied with it's distance from the belt, and there exist evidently an optimal Zone and a minimum Zone in Soil moisture content. On this basis, the agricultural planting patterns could be regulated to utilize soil water more efficiently, which provided one approach to watersaving agriculture.It reached the conclusion that the type of shelterbelts, height of trees, composition of tree species, and distances between two belts were all important factors affecting soil moisture distribution in the shelter net, which provided scientific basis to the optimization of shceltfrbelt system.
出处
《植物研究》
CAS
CSCD
北大核心
1994年第2期186-190,共5页
Bulletin of Botanical Research
基金
国家"七五"期间攻关项目
关键词
防护林
土壤水分
动态变化
helterbelt
Soil moisture
Dynamics
Water-saving agriculture
