草业学报2016，Vol.25Issue(4)：45-54,10.DOI:10.11686/cyxb2015523
川西北沙化草地植被群落、土壤有机碳及微生物特征
Plant community characteristics,soil organic carbon and soil biological properties of grassland desertification sites in Northwest Sichuan
摘要
Abstract
Changes in surface vegetation cover,soil organic carbon and soil microorganisms associated with al-pine grassland desertification in Northwest Sichuan were explored.We studied the surface vegetation cover, aboveground and underground biomass and the vertical distribution of soil organic carbon and microorganisms in different grassland on sandy soils using repeated sampling.The results showed that with aggravation of de-sertification,vegetation cover and aboveground and underground biomass decreased sharply.Compared with grassland not undergoing desertification,aboveground biomass of grassland suffering mild,medium,heavy and severe desertification was decreased by 13.0%,91.8%,76.5% and 40.6% respectively.Underground biomass decreased by 21.4%,44.0%,83.4% and 94.7% respectively.With the increase of the degree of desertifica-tion,soil organic carbon and humus carbon fractions showed a declining trend,most obvious in the 0-20 cm soil layer.There were differences among different soil layers but there were no differences between grassland undergoing heavy and severe desertification.The degree of desertification also influenced the number of soil mi-croorganisms (bacteria,fungi,actinomycetes)and microbial biomass carbon and nitrogen;desertification re-duced all of these soil traits.关键词
草地沙化/植被群落/有机碳/微生物Key words
grassland desertification/vegetation community/soil organic carbon/microorganism引用本文复制引用
舒向阳,胡玉福,蒋双龙,马畅,李一丁,蒲琴,王倩..川西北沙化草地植被群落、土壤有机碳及微生物特征[J].草业学报,2016,25(4):45-54,10.基金项目
四川省科技支撑计划项目（2013SZ0110），四川省科技计划项目（2013SZ0110和2014SZ0159）资助。 （）
