长期轮作施肥对土壤微生物碳氮的影响

Effects of Long-term Rotations and Fertilizations on Soil Microbial Biomass Carbon and Nitrogen

就设在黄土高原旱作农耕地上的长期定位试验不同处理土壤微生物量碳氮进行研究 ,主要就长期不同施肥、种植不同作物及轮作等农业措施对土壤微生物量碳氮的影响进行研究。结果显示 :施肥与种植作物提高了土壤微生物量碳氮含量 ,长期施用土粪肥显著提高微生物量碳氮含量 ,施化肥与有机肥并种植苜蓿处理微生物量碳氮是长期休闲地的 3.7倍 ,轮作比连作更有利于微生物量碳氮的提高 。

The fertilization, crop types and planting ways that affected amount of soil microbial biomass carbon and microbial biomass nitrogen were studied according to the data of a long term experiment. Long term fertilization and planting increased the content of soil microbial biomass carbon (Bc) and microbial biomass nitrogen (Bn). Especially, manure can enhance Bc and Bn significantly. The Bc of treatment applied chemical and manure fertilizers along with alfalfa planted was 3.7 times than that of fallow treatment, therefore rotation and applied manure are main ways that improve soil fertility in this area.