Changes of Soil Microbial Biomass C and qSMBC during Degraded Karst Forest Restoration in Guizhou Plateau
The changes of SMBC and qSMBC of different soil layer, different microhabitats and rhizosphere, non-rhizosphere were studied during the process of degraded karst forest restoration by using the methods of microbial incubation and the chloroform fumigation-direct extraction. The results showed that SMBC and qSMBC had obvious difference. With degraded karst forest restoration, SMBC and qSMBC were ascending obviously, taking on arboreal community stage >shrubby community stage > herbaceous community stage >bare land stage, which indicated that the soil quality has been restored gradually. The SMBC and qSMBC took on the characteristic of vertical change in the soil profile, which decreased with the increase of the soil depth, presenting A >B. But change of qSMBC was opposite, it decreased with the forest restoration. The changes of SMBC in different habitats overall performed the characteristics which stone gully was higher than soil surface and stone-groove, It was because stone gully habitat were advantageous to breed soil microorganisms and animal and plant groups. But change of qSMBC was just opposite. The SMBC and qSMBC were different between the rhizosphere and none-rhizosphere. The former performed obviously rhizosphere > non-rhizosphere, the later performed rhizosphere<non-rhizosphere.
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万方数据
维普
