黄土丘陵区不同植被恢复措施对土壤养分和微生物量C、N、P的影响

Changes of Soil Nutrient and Soil Microbial Biomass C,N and P in Different Plant Rehabilitation on the Loess Hilly Area of Ningxia

以黄土丘陵典型地区-宁夏固原不同植被恢复措施:撂荒地、人工草地、天然草地和灌木林地(柠条)为研究对象,分析了不同植被类型下土壤微生物量碳、氮、磷的变化。研究结果表明:不同植被类型条件下,土壤微生物量有显著差异,微生物量碳和微生物量磷含量均表现为撂荒地<人工草地<天然草地<灌木林地,微生物量氮以人工草地略低,撂荒地和柠条林地较大。土壤微生物量碳、氮、磷与土地利用方式关系密切。柠条林对土壤微生物生物量有明显的促进作用。

Soil microbial biomass carbon（Cmic）,nitrogen（Nmic）,phosphorus（Pmic） were studied under different vegetation types,which were abandoned land,artificial grassland,natural grassland and Caragana korshinskii shrubland on the loess hilly area of Guyuan of Ningxia province.The results showed that the soil microbial biomass has significant difference in different plant.Cmic and Pmic was abandoned landartificial grasslandnatural grasslandCaragana korshinskii shrubland;The Artificial grassland had lowest microbial biomass nitrogen,but the abandoned land and Caragana korshinskii shrubland had higher microbial biomass nitrogen;Soil microbial biomass carbon,nitrogen,phosphorus had positively relationship with land use.Caragana korshinskii shrubland play positive role in promoting microbial biomass.