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土壤微生物量碳(MBC)是反映农田土壤质量的重要指标。本研究以西藏河谷农田生态系统为对象,在中国科学院拉萨农业生态试验站长期施肥样地和农田撂荒地通过随机混合采样获取土壤样品,实验室内以氯仿熏蒸法测定土壤微生物量碳,探讨了不同施肥方式、不同除草方式对西藏河谷农田土壤质量的影响。从3个不同生育期的平均结果来看,施加羊粪样地的土壤微生物量碳比空白样地提高了56.1%,单纯施用化肥样地的微生物量碳比空白样地降低了14.0%,表明有机肥的施用对于提高西藏农田土壤质量具有显著的促进作用,而单纯施用化肥则会导致土壤质量的下降。在农田撂荒地试验中,自然撂荒样地(不除草)的土壤微生物量碳大约为85.2 mg/kg,而经常除草样地的土壤微生物量碳比不除草样地降低约1/4,从而进一步说明有机质输入对于提高高原农田土壤质量具有重要的作用。
Soil microbial biomass carbon (MBC) is an important indicator of farmland soil quality. In this study, soil samples were obtained from stochastic sampling in long-term fertilization plots and abandoned farmland of Lhasa Agro-Ecological Experimental Station, Chinese Academy of Sciences. Soil microbial biomass carbon was determined by chloroform fumigation in laboratory. Effect of Different Fertilization Methods and Different Weeding Methods on Soil Quality in Farmlands of Tibet Valley. According to the average results at three different growth stages, soil microbial biomass carbon was increased by 56.1% compared with the blank sample in the application of sheep manure, and decreased by 14.0% compared with the blank sample in the pure fertilizer application The application of organic fertilizer has a significant role in promoting the quality of farmland soil in Tibet, while the simple application of chemical fertilizers will lead to the decline of soil quality. In the fallow land experiment, the soil microbial biomass carbon in the natural abandoned land (no weed control) was about 85.2 mg / kg, whereas the soil microbial biomass carbon in the conventional weeding land decreased about 1/4 compared with that in the non-weeding land, It shows that input of organic matter plays an important role in improving soil quality of plateau farmland.