黄土高原典型植物根际对土壤微生物生物量碳、氮、磷和基础呼吸的影响

选择黄土高原7种典型植物的根际与非根际土壤为研究对象,对土壤的养分含量、微生物生物量碳、氮、磷和基础呼吸的影响进行了初步研究。结果表明,7种不同植物根际土壤与非根际土壤的养分含量、微生物生物量和基础呼吸均存在显著差异;除冷蒿的土壤微生物生物量磷以外,其他各种植物的根际土壤的养分含量、微生物生物量和基础呼吸均比非根际土壤的高;土壤有机碳、全氮与土壤微生物生物量碳、氮及基础呼吸之间均具有极显著或显著相关关系,表明了土壤微生物生物量碳、氮可以作为判断土壤肥力状况的生物学指标,同时也可为提高土壤肥力水平和土壤培肥效果提供依据。

Soil microbial biomass C, N, P and basal respiration in rhizosphere soil of typical plants on the Loess Plateau

The rhizosphere soil and the non- rhizosphere soil of seven typical plants were collected as the research object on the Loess Plateau, Soil microbial biomass, basal respiration and soil nutrient were studied through the experiment. The experimental results indicated that: The rhizosphere soil and the non- rhizosphere soil of the seven typical plants had significantly differences in both soil microbial biomass and basal respiration; Except that the content of soil microbial biomass P was lower in the rhizosphere soil of Artemisia frigida compared to the non-rhizosphere soil, Both the content of soil microbial biomass and the content of basal respiration were higher in the rhizosphere soil of others plants compared to the non-rhizosphere soil; Soil organic C and total N have correlations with soil microbial biomass C, soil microbial biomass N and basal respiration; But there is significant correlation among soil microbial biomass C, soil microbial biomass N and basal respiration, soil microbial biomass P is not correlated with soil microbial biomass C, soil microbial biomass N and basal respiration; Comparing soil microbial biomass and basal respiration of the seven typical plants, the content in the soil of A. frigida and Agropyron cristatum were higher than that in the soil of others plants, the content in the soil of Lespedeza bicolor Turcz being the lowest.