基于GIS的陕北农牧交错带立地类型划分研究  

Study on the site type classification in agriculture and pasturage interlaced zone of North Shaanxi based on GIS

作　　者：赵鹏祥[1] 徐国策[1] 王鸿哲[1] 刘广全[1] 

机构地区：[1]西北农林科技大学林学院,陕西杨凌712100

出　　处：《西北农林科技大学学报（自然科学版）》2009年第10期76-82,共7页Journal of Northwest A&F University(Natural Science Edition)

基　　金：国家科技支撑计划林业项目(2006BAD03A0308)

摘　　要：【目的】基于GIS对陕北农牧交错带的立地类型进行划分,为陕北农牧交错带的植被恢复和营林工作提供指导。【方法】利用数量化理论Ⅰ,并结合GIS技术,以陕北吴起县周湾镇和长城乡为例,以土壤含水量为指标进行立地类型划分,得出了立地类型分布图,并计算了各立地类型的面积,同时编制了各立地类型的适生树种表。【结果】水分是制约陕北农牧交错带造林成活率的主导因素,影响土壤水分的因子按大小依次为坡向、坡位和坡度。【结论】水分条件最好的立地类型主要集中在沟底和坡度较缓的阴坡,该处土地质量较好,植被容易恢复;水分条件较好的立地类型主要在坡的下部,植被可恢复;坡的上部植被较难恢复,尤其是阳坡;陡坡水分限制较严重,建议自然恢复。[Objective] Site type classification based on GIS provides instruction to vegetation restoration and the afforestation in Agriculture and Pasturage Interlaced Zone of North Shaanxi. [Method] This paper adopts the Quantification Theory Ⅰ using soil water content with the GIS technology. Taking Zhouwan Town and Changcheng Township of Wuqi County in northern Shaanxi as example, and carrying out site type classification,the site type distribution map was obtained,the area of each site type was calculated and the suitable tree species for each site type was established. [Result] The water content is the predominant factor in restricting the survival rate. The factors affecting the soil water are： the aspect〉the slope position〉the slope. [Conclusion] The site type of the best water content concentrates on the bottom of ditch and in the shade and gentle slope. The soil quality is better and the vegetation is easier to restore. The site type of the better water content is mainly in the bottom of slope and the vegetation is easier to restore. The site type in the top of slope is hard to restore,especially in sunny slope. The steep slope is advised to restore naturally because of lacking water.

关 键 词：陕北 农牧交错带 立地类型划分 地理信息系统(GIS) 遥感(RS) 数量化理论Ⅰ 

分 类 号：S127[农业科学—农业基础科学]