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研究了长期定位试验不同土地利用方式下土壤微生物生物量氮的变化,结果表明:农田生态系统中,长期施用化肥并不能提高微生物生物量氮的水平,但可以加快其周转速率。NPK配合猪厩肥处理的微生物体氮含量最高,周转也最快。林地和草地生态系统中,荒地处理由于积累的有机物很多,其微生物量氮最大,其次是林地处理和割草处理,裸地处理的微生物生物量氮最低。各处理的土壤微生物量周转速率为:NPK+M>荒地>林地=割草>NPK>CK>裸地。
The changes of soil microbial biomass nitrogen under different land use patterns under long-term experiment were studied. The results showed that long-term application of chemical fertilizers could not increase the level of microbial biomass nitrogen in farmland ecosystem, but could accelerate its turnover rate. NPK with pig manure treatment of the highest nitrogen content of microorganisms, turnover is also the fastest. Among the forestland and grassland ecosystem, the wasteland has the highest microbial biomass nitrogen due to the accumulation of organic matter, followed by the forestland and mowing treatments, and the lowest biomass nitrogen in the bare land. The turnover rate of soil microbial biomass in each treatment was NPK + M> wasteland> woodland = mowing> NPK> CK> bare land.