吉林省不同黑土土壤微生物学肥力指标差异

Evaluation Index Differences of Microbial Fertility in Different Fertility of Mollisols in Jilin Province

选择吉林省不同肥力黑土,开展高、中、低肥力土壤微生物数量、土壤微生物量碳、微生物量氮及土壤酶活性等微生物学指标测定,系统分析不同肥力土壤微生物学指标差异,拟合不同肥力土壤与微生物学肥力指标的关联性,确定不同肥力土壤微生物学指标参考标准值。结果表明,不同肥力土壤微生物学肥力指标有很大差异,高肥力土壤具有较高的细菌、放线菌、微生物量碳、微生物氮数量以及土壤酶活性,真菌数量较低,为细菌型健康土壤;低肥力土壤细菌、放线菌、微生物量碳、微生物氮数量和土壤酶活性较低,真菌数量较高。提出吉林省不同肥力土壤相关微生物指标临界阈值,建立不同肥力土壤微生物学肥力指标评价标准。

Selection of different fertility black soil in Jilin province, the soil microbial flora, soil microbial biomass carbon, soil microbial biomass nitrogen and soil enzyme activity were measured in high, medium and low fertility soils. The differences of microbial indicators in different fertility soil were systematically analyzed, and the correlations between different fertility soil and microbial indicators were fitted, and the reference standard values of soil microbial indicators for different fertility soil were determined. The results showed that the soil microbial fertility index varied greatly with different fertility soil. High fertility soil had higher bacteria, actinomycetes, microbial biomass carbon, microbial nitrogen and soil enzyme activity, but the number of fungi was lower, which was healthy soil.The number of bacteria, actinomycetes, microbial biomass carbon, microbial nitrogen and soil enzyme activity in low fertility soil were lower, and the number of fungi was higher. The critical thresholds of soil-related microbial indexes for different fertility soil in Jilin province were proposed, and the evaluation criteria of microbial fertility indexes for different fertility soil were established.