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我省位于祖国东北,属寒温带地区,春、夏、秋三季偏短,冬季长,大地冻结期间微生物活动近乎停止,有利于有机物质的积累。中国科学院林业土壤研究所调查,黑土地带的植物每年地上部分积累的干物质,每亩达631.2斤,地下部分积累的干物质达1,693斤。地上地下共积累干物质2374.2斤。植物覆盖较为严密,有利水土保持,全部植物残体基本留在原地积累,营养元素几乎没有流失。元素循环属生物小循环,收入大于支出。这
My province is located in the northeast of the motherland, is a cold temperate region, spring, summer, autumn is short, the winter long, frozen during the close of microbial activities, is conducive to the accumulation of organic matter. According to a survey conducted by the Institute of Forestry and Soil Science, Chinese Academy of Sciences, dry matter accumulated in above-ground parts of black soil plants per day reached 631.2 kg and 1,693 kg of accumulated dry matter in underground parts. A total of 2374.2 kg of dry matter accumulated on the ground. Plant coverage is more stringent, favorable soil and water conservation, all plant residues basically stay in place to accumulate, with almost no loss of nutrients. Element cycle is a biological cycle, the income is greater than the expenditure. This