| 摘要: |
| 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。 |
| 关键词: 富里酸 腐殖质含量 土壤有机质含量 白浆土 有机物质 白浆层 胡敏素 活性胡敏酸 下降速率 开垦年限 |
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| PRELIMINARY RESEARCH ON THE DEGRADATION RATE OF ORGANIC SUBSTANCES AFTER CULTIVATION OF PLANOSOL |
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| Abstract: |
| Planosol we examined is located in the north-eastern part of China.After cultivation of the virgin land,the organic matter co- ntent dropped rapidly from 5-10% to 8-5% due to the change of eco- logical environments. 1.The rate of the decrease of humic substances under different pe- riods of cultivation,On the base of 5 years cultivation,the organic matter content of surface soil dropped to 78.66% of the original value after 10 years of cultivation,and still dropped to 58.70% for 20 years. The figures for AW... |
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