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通过对荒地及不同开垦年限的白浆土0—20厘米多点混合样的对比分析,结果表明:(1)土壤有机质的含量随着开垦年限的增加而降低,下降的速率开始快,后来慢,逐渐趋向于相对稳定。(2)土壤有机质的活度(易氧化有机质/有机质总量)开垦后有降低的趋势,但不显著。(3)各组分降低的幅度和速度有所不同,胡敏酸较稳定,降低的幅度小,且比较缓慢。H/F荒地最小为0.94,开垦后略有增大,最大达1.26。胡敏素降低幅度大,速度快,可能是限于样品处理技术,未能使半分解的植物碎屑物质从典型的腐殖质中分离出来所致。
The results showed that: (1) The content of soil organic matter decreased with the increase of reclamation age, and the rate of decline began to fast and then slowed down , Gradually tend to be relatively stable. (2) The activity of soil organic matter (total amount of organic matter / organic matter susceptible to oxidation) tended to decrease after reclamation but not significant. (3) The magnitude and speed of the decrease of each component are different, humic acid is more stable, lower rate of decline, and more slowly. The minimum H / F wasteland is 0.94, slightly increased after reclamation, up to a maximum of 1.26. Humin reduction, speed, may be limited to sample processing technology, failed to make the semi-decomposed plant debris from the typical humus isolated.