张家界市土壤有机质含量调查及分析

为了全面了解掌握张家界市两区两县土壤有机质含量状况,采用S型布点取样的方法对具有代表性的土壤类型进行采样,共采集土壤样品250个,并采用重铬酸钾外加热容量法进行有机质含量测定。结果表明,各地区土壤有机质含量差异很大,总变幅为7.20～51.16 g/kg,其中,以武陵源区土壤有机质含量变幅最大,变幅为16.00~51.60 g/kg;其次为桑植县,变幅为11.10～39.90 g/kg;永定区与慈利县变幅相差不大,分别为7.23～36.30 g/kg和7.50～32.00 g/kg。不同土壤类型对土壤有机质的影响较大,含量最高的为黑色石灰性土壤,平均含量为36.30 g/kg;最低的为紫色土和山地棕壤,平均含量为16.07,16.10 g/kg。62.40%的土壤有机质含量变幅在20～30 g/kg之间。

Investigation and Analysis on Soil Organic Matter Content in Zhangjiajie City

To understand the condition of soil organic matter contents in two counties and two districts of Zhangjiajie,250 samples were taken by the method of S-distribution from representative soil types and their organic matter contents were determined by the potassium dichromate-volumetric outside heating method.The results showed that the soil organic matter contents had significant differences between areas,and the total soil organic matter content ranged from 7.20 to 51.16 g/kg,in which the variation scope of s...