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土壤有机质是土壤肥力的主要组成部分,是土壤肥力高低的重要指标。认真研究有机质在土壤中含量的变化规律,对提高土壤肥力、增加土壤后劲有重要意义。一、耕地土壤有机质下降规律 1.垦后土壤有机质下降的普遍性据调查,全省开垦20年的耕地,有机质由原来的6～7%下降到4%以下的面积占60%,下降到3%以下的占30%。实际含量下降了30%左右。其中克山、拜泉由垦殖初期的8～12%,下降到4～5%,平均以0.05～0.1%速度递减;佳木斯地区垦殖初期
Soil organic matter is a major component of soil fertility and an important indicator of soil fertility. It is of great significance to study the variation of organic matter content in soils to improve soil fertility and increase soil stamina. First, the decline of soil organic matter in cultivated land 1. After the reclamation of the universality of soil organic matter According to the survey, the province reclamation of 20 years of arable land, organic matter from the original 6 ~ 7% down to 4% of the area accounted for 60%, down to 3 % Below 30%. The actual content dropped by about 30%. Among them, Keshan, Baiquan decreased from 8% to 12% in the initial stage of reclamation to 4% to 5%, decreasing by an average of 0.05% to 0.1%. In the early stage of Jiamusi cultivation,