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白浆土开垦二、三十年后,有机质含量一般由原有的5—10%下降到3—5%。本文通过测定开垦5年、15年、和25年的白浆土有机质及腐殖质各组分的含量,计算下降速率。各组分的下降顺序为:活性胡敏酸>胡敏酸>富里酸>胡敏素,黑土层含量的下降速率又大于白浆层,在垦后生态环境中呈继续下降的趋势。要维持土壤一定的腐殖质含量,在现行的轮作制中需要采取增加有机质的措施,才能培肥土壤,达到高产稳产的目的。
After two or three years of reclamation of albacore soil, the organic matter content generally drops from 5-10% to 3-5%. In this paper, the rate of decline was calculated by measuring the content of organic matter and humus in albacore soil of 5 years, 15 years and 25 years after reclamation. The descending order of the components was: active humic acid> humic acid> fulvic acid> humin, and the decreasing rate of the black soil layer content was greater than that of the white pulp layer, and continued to decline in the ecological environment after reclamation. In order to maintain the certain humus content of the soil, it is necessary to adopt measures to increase the organic matter in the current crop rotation system so as to fertilize the soil and achieve the purpose of high and stable yield.