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对贵州花江喀斯特高原生态综合治理示范区内不同植被类型下土壤4大微生物生理类群(氨化细菌、硝化细菌、纤维素分解菌及固氮菌)数量的时空动态变化进行研究。结果表明,4种植被类型土壤4大微生物生理类群中,氨化细菌数量最大,固氮菌及纤维素分解菌次之,硝化细菌数量最小,分别占微生物总数的59.13%~66.32%,29.00%~35.69%,3.71%~4.03%和0.42%~1.22%。4种植被类型不同空间层次土壤4大微生物生理类群数量变化均较大,表土层(A层)的数量为下土层(B层)的1.21~1.68倍;不同植被类型土壤4大微生物生理类群数量及其总数季节变化明显,夏季达最大,冬季最小,年际变化基本一致,总体上表现为夏季>秋季>春季>冬季的特点(P<0.05);不同植被类型同一时间土壤4大微生物生理类群总数差异较大,为3.19×105~7.64×105CFU/(g干土),表现出森林>灌木林>草地>裸荒地的分布特点。
The spatial and temporal dynamics of soil microbial populations (ammonification bacteria, nitrifying bacteria, cellulolytic bacteria and azotobacter) under different vegetation types in the Huajiang Karst Plateau Ecological Comprehensive Management Demonstration Area were studied. The results showed that the number of ammonifying bacteria was the largest among the four microbial communities in the four vegetation types, followed by the azotobacter and the cellulose-degrading bacteria, which accounted for 59.13% -66.32% and 29.00% respectively of the total number of microorganisms, 35.69%, 3.71% ~ 4.03% and 0.42% ~ 1.22%. The quantity of four macro-physiology groups in four types of vegetation varied in different spatial layers, and the number of topsoil (A layer) was 1.21-1.68 times that of the lower soil layer (B layer). The four micro-physiology groups (P <0.05). The four major microbial physiology of soil at the same time with different vegetation types The total number of taxa varied greatly, ranging from 3.19 × 105 to 7.64 × 105 CFU / (g dry soil), showing the distribution characteristics of forest> shrub> grassland> bare land.