丘林法测定土壤有机质,多年来一直是通用方法。此法快速、设备简单,但需要用油浴或磷酸浴加热,操作麻烦、成本较高。嗣后,Walkley—Black(1934)提出铬酸氧还滴定水合热法,操作更为简便,并与干烧法有较好的相关性。Walkley提出室温和试剂温度在15—30℃时,室温每升高5℃,土壤有机质的回收率增加约1％。据此,西 The method of determining the soil organic matter by the Churning method has been a common method for many years. This method is fast, the equipment is simple, but need to use oil bath or phosphoric acid bath heating, the operation is troublesome, the cost is higher. Subsequently, Walkley-Black (1934) proposed chromate oxygen titration hydration method, the operation is more simple, and dry combustion method has a good correlation. Walkley suggested that at room temperature and reagent temperatures of 15-30 ° C, the increase in soil organic matter recovery by about 1% for every 5 ° C increase in room temperature. Accordingly, West