高温烘干测定土壤水分的时间规范研究  

A Study on the Time Specification of High-temperature Oven-drying in Determination of Soil Moisture

作　　者：史竹叶[1] 韩仕峰[1] 

机构地区：[1]中国科学院水利部西北水土保持研究所

出　　处：《水土保持通报》1991年第6期51-57,共7页Bulletin of Soil and Water Conservation

摘　　要：通过对4种质地(即沙壤、轻壤、中壤和重壤)土壤,在4种温度下的恒温烘干试验(105℃、125℃、140℃、150℃)和有机质含量测定。结果表明:它们的失水规律一般是沙壤和轻壤采用125℃恒温2h;中壤和重壤恒温2h20min,可代替常规烘干土样方法,从而缩短了烘土时间。而高温烘干土样有机质含量与风干土有机质含量比较,绝对误差小于0.05%,故有机质含量不影响高温烘干法。Four kinds of texured soils (i. e. sandy loam, light loam, medium loam and heavy loam) were experimentally oven-dried at four kinds of constant temperatures (105℃, 125℃, 140℃, and 150℃) with organic matter contents determined. The results indicate that the laws of their moisture losses are in general that the constant temperatures of 125℃ is adopted to sandy loam and light loam for two hours; and the constant temperature for medium loam and heavy loam for two hours and 20 minutes, which can replaee the conventional methods of drying soil samples thereby to shorten the oven-drying time of soil samples. In comparison of soil organic matter contents in high-temperature oven-drying with natural airdcying, the absolute error is less than 0.05% so that high-temperature oven-drying method will not affect soil organic contents.

关 键 词：土壤 水分 测定 高温烘干法 

分 类 号：S152.7[农业科学—土壤学]