不同利用方式对紫色水稻土微生物量碳的影响

通过研究西南大学试验农场包括不同的耕作、轮作和施肥的综合利用方式对经14年28茬的中性紫色水稻土壤微生物量碳的差异，探究利用方式对紫色水稻土生物活性的影响。结果表明：耕层土壤微生物量碳主要介于200~600mg/kg，除垄作耕翻（稻油）处理外，基本随深度增加而降低。长期垄作免耕并实行稻油轮作的利用方式使其土壤微生物量碳在0~10cm土层与其他利用方式相比明显增加，并且差异显著；而水旱轮作（稻油）的利用方式不利于增加微生物量碳，说明微生物量碳可用作利用方式影响紫色水稻土土壤质量变化的生物学评价指标。从提高土壤生物活性与有机碳含量的角度来看，垄作免耕（稻油）的利用方式最适合于紫色水稻土。

Effect of Land Use Pattern on Soil Microbial Carbon of Purple Paddy Soil

Effect of land use pattern on soil microbial carbon of purple paddy soil were investigated in a field experiment ,which consisted of five treatment and had continued for 16 years at the farm of College of Resource and Environment of Southwest University. The results showed that content of microbial biomass carbon range from 200 to 600 mg/kg and decreased with increasing depth except for the conventional tillage and ridge, rice and rape. Microbial biomass carbon in no tillage and ridge, rice and rape in 0-10cm depth layer much more than other treatments after 14 years and showed significant differences;land use of rotation of waterlog rice and dry rape which was disadvantageous to increase the quantity of microbial biomass carbon value, which indicated microbial biomass carbon is good biological evaluation index of soil quality land use effect for paddy soil. Land use pattern of tillage and ridge, rice and rape is best for improve the Biological Activity and organic carbon of purple paddy soil.