吉林省各级沙化土地资源的分布状况

Distribution Conditions of Sandificated Land Resources at All Grades in Jilin Province

摘要:

吉林省约有97 8万hm²的沙化土地,在根据“综合指数和法”将其划分的Ⅰ、Ⅱ、Ⅲ三个等级中表现出:各等级在干燥度、沙土稳固性、有效土壤层次(腐殖质层或土壤本身发育程度)厚度、土壤有机质含量、土壤速效磷、土壤物理性粘粒和10℃积温等方面皆有一定差异;其分布为Ⅱ等沙地面积居多,在耕、草、林的不同沙地利用类型中Ⅰ、Ⅱ、Ⅲ三个等级的占有面积差别明显。同时还明确了三个等级的沙地在各县的分布情况。

Abstract:

There are about 978 000 ha of sandificated land in Jilin province.In the three grades（Ⅰ、Ⅱ、Ⅲ）of sandificated land divided according to the method of composite index sum,the following are showed: There are all definite difference between the aridities,the stabilities of sandy soil,the depths of effective soil layers （hummus layers or soil itself developing extents）,the contents of soil organic matter,soil quick-acting P,soil physical sticky particles,the total temperatures above 10℃of all grades of sandificated land.The area of sandificated land at grade Ⅱ is the biggest.In different sandy land utilization types of cultivated land,grassland,forest land,there are remarkable differences between the actual processing areas of the 3 grades.The thesis makes clear the distribution conditions of the 3 grades of sandificated land in all counties.