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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碳的变化,结果表明:裸地处理的微生物生物量碳最低;不施肥种植作物(CK)或施肥种植作物(NPK)能显著提高土壤微生物量碳含量;NPK配合猪厩肥处理的微生物体碳含量显著高于CK和NPK处理;荒地处理由于返回的植物残体量很大,积累的有机物很多,所以其微生物量碳最大;其次为割草处理和林地处理。有机质含量高的土壤其土壤微生物量也高,土壤微生物碳的周转强度也大,周转时间短,周转速率为:荒地>割草>林地>NPK+C>NPK>CK>裸地。
The results showed that the microbial biomass carbon in bare land was the lowest. Soil non-fertilizing plantation (CK) or fertilizing planting crop (NPK) could significantly increase soil microbial The carbon content of microbial biomass treated with NPK combined with pig manure was significantly higher than that of CK and NPK treatments; the waste biomass of the treated plants was the largest due to the large amount of returned plant residues and the accumulated organic matter, followed by mowing Processing and woodland processing. The soil organic matter with high soil microbial biomass was also high, soil microbial carbon turnover intensity is also large, short turnaround time, turnover rate: wasteland> mowing> woodland> NPK + C> NPK> CK> bare land.