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分析和比较了甘肃省中部典型黄土丘陵区不同降雨量下人工重建林土壤性状及微生物特性。结果表明:随降水量的增加,土壤含水量升高,pH值变化不明显;土壤有机碳、全氮、微生物量碳、微生物量氮含量均表现为以400mm降水量为分界线,降水量≥400mm样地的含量显著高于降水量<400mm样地(p<0.05);降水量为500mm样地的全磷、速效磷、速效钾含量及土壤微生物呼吸最高,但土壤微生物呼吸熵为200mm降水量样地最高;微生物熵变化不显著。相关性分析表明,不同降水量梯度下,土壤理化性质与微生物特性之间存在不同程度的相关性。
The soil characteristics and microbial characteristics of the artificial rebuilding forests under different rainfalls in a typical loess hilly region in central Gansu were analyzed and compared. The results showed that with the increase of precipitation, the soil moisture content increased but the pH value did not change obviously. The contents of soil organic carbon, total nitrogen, microbial biomass carbon and microbial biomass nitrogen all showed the boundary of 400mm precipitation, the precipitation ≥ 400mm plot was significantly higher than that of precipitation <400mm plot (p <0.05). The total phosphorus, available phosphorus and available potassium in the 500mm precipitation were the highest, while the soil microbial respiration was the highest, but the soil microbial respiration entropy was 200mm precipitation The highest amount of sample; microbial entropy change was not significant. Correlation analysis shows that there is some degree of correlation between soil physicochemical properties and microbial characteristics under different precipitation gradients.