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基于喀斯特峰丛洼地农作区、人工林、次生林、原生林4类生态系统土壤微生物量、微生物数量及土壤养分的分析,本文探讨了不同生态系统土壤微生物特征及其与土壤养分的耦合关系。结果表明:不同生态系统微生物种群组成不同,真菌比率均较低,农作区、人工林、原生林的放线菌比率较大,而次生林细菌比率较大;不同生态系统中微生物量碳(Cmic)与微生物量氮(Nmic)、微生物量磷(Pmic)的相关性均达到了显著或极显著水平;不同生态系统土壤微生物量与土壤养分的关系密切,而微生物数量与土壤养分的相关性均较弱,表明土壤微生物细菌、真菌、放线菌种群数量分布的随机性较大,而不是受单一养分因子的控制;不同生态系统中土壤微生物属性和土壤养分的耦合关系不同:农作区土壤有机质(SOM)、pH、全磷(TP)起较大作用,主要影响土壤Cmic、细菌和真菌;人工林中土壤水分、SOM、全氮(TN)、TP主要影响土壤微生物量;次生林中以pH、SOM、TP、碱解氮(AN)、速效钾(AK)主要影响土壤微生物量和真菌;原生林主要有pH、TP、AN影响土壤微生物量和细菌。
Based on the analysis of soil microbial biomass and microbial biomass in four types of ecosystems including karst peak-cluster depression farmland, plantation, secondary forest and primary forest, this paper discussed the relationship between soil microbial characteristics and soil nutrient in different ecosystems. The results showed that: the microbial population in different ecosystems was different, the fungi rates were lower, the actinomycetes ratio in farming areas, plantations and primary forests was larger, while the proportion of secondary forest bacteria was larger; the microbial biomass Cmic ) And microbial biomass nitrogen (Nmic) and microbial biomass phosphorus (Pmic) reached significant or extremely significant levels. Soil microbial biomass was closely related to soil nutrients in different ecosystems, while the correlation between microbial biomass and soil nutrients Weak, indicating that the population distribution of bacteria, fungi and actinomycetes in soil microorganisms is rather random, not controlled by a single nutrient factor. The coupling relationship between soil microbial properties and soil nutrients in different ecosystems is different: Soil organic matter (SOM), pH and total phosphorus (TP) played a major role in affecting soil Cmic, bacteria and fungi. Soil water, SOM, total nitrogen (TN) and TP in the plantations mainly affected soil microbial biomass Soil microbial biomass and fungi were mainly affected by pH, SOM, TP, AN, AK. The soil microbial biomass and bacteria were affected by pH, TP and AN in primary forest.