黑龙江省土壤开垦后土壤有机质含量的变化

黑龙江省土壤开垦后有机质含量的下降受到人们的关注,有许多报道,但其结果相差悬殊,这是由于土壤的异质性导致的。实际上是在开垦初期的3～5年内,下降的很快,后来变慢,并逐步达到与生物气候相适应的相对稳定的状态。为了保持和提高土壤的生产力,向土壤中施加有机物料,更新和增加有机质是必要的。

The Changed of Soil Organic Matter after Cultivated in Heilongjiang Province

The issue of decreasing soil organic matter （SOM） content after being cultivated in Heilongjiang province has attracted great interest and attention. However the reported results are inconsistent, probably due to the spatial variability of the soils sampled and studied. The SOM content declined rapidly during the first three to five cultivation, and then gradually reached a relatively stable level, being at equilibrium with the local bioclimatic conditions and agronomic practices. It is critically important to add the organic matter into soils in order to maintain and increase the soil fertility and productivity.