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燃烧法一直被认为是测定土壤有机质的准确的方法,但不论是干烧法或湿烧法,都因为需用特殊的仪器设备,操作繁长费时,不便于例行分析。来源于Schollenberger的铬酸氧还滴定外热源法,多年来在我国广泛应用,此法快速、设备简单,与干烧法相关性好,但因为要用油浴或磷酸浴等加热,操作也较麻烦。Walkley-Black的铬酸氧还滴定水合热法,操作手续更为简便,精密度高,与干烧法有良好的相关性,似更适于我国土壤普查工作中大批土壤样品有机质的测定。但此法对土壤有机质的回收率比外热源法更低,回收率的范围也较宽,对不同类型的土壤要采用不同的氧化校正系数。为选择水合热法的测定条件,确定水合热法在我国不同土壤类型中有机质的回收率及与外热源法的相关性,我们做了这个试验。
The combustion method has long been considered as an accurate method for determining soil organic matter. However, both the dry method and the wet method require routine equipment due to the time-consuming and inconvenient routine analysis. Chromate from Schollenberger also titration of external heat source method, widely used in China for many years, this method is fast, simple equipment, and good correlation with the dry burning method, but because of the use of oil bath or phosphoric acid bath heating, the operation is also more trouble. Walkley-Black chromate oxygen titration hydration method, the operation procedure is more simple, high precision, and good correlation with the dry method, it seems more suitable for soil survey in China a large number of soil samples organic matter determination. However, this method of soil organic matter recovery rate is lower than the external heat source method, the recovery range is also wider, for different types of soil to use different oxidation correction factor. In order to select the determination conditions of hydration heat method and determine the recovery rate of organic matter by hydration heat method in different soil types in China and the correlation with external heat source method, we did this experiment.