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对南亚热带赤红壤地区、广州市花县不同薪材用材林型下土壤微生物特性研究表明，不同林型下的年均土壤微生物（主要是细菌、真菌和放线菌）总量由高到低依次为：混交林＞豆科纯林＞纯桉树林＞裸露生荒地。大叶相思与按树混交林地土壤具有较高的纤维素酶和转化酶活性，而豆科纯林土壤中则有较高的脲酶、蛋白酶和触酶活性。土壤的呼吸作用强度以马占相思纯林及其混交林为高，纯桉树林较低。经过五年垦荒造林后，土壤中的微生态环境有很大改善，这种变化由地下微生物特性和地面上林木的生物量充分反映出来，而未开垦生荒地土壤微生物数量和生物化学活性则仍处于低水平的衰退状态。
The results showed that under the different types of forests, the annual average amount of soil microorganisms (mainly bacteria, fungi and actinomycetes) decreased from high to low in the southern subtropical red soil region. As: mixed forest> legume pure forest> pure eucalyptus forest> exposed wild wasteland. The soil of Acacia crassicarpa and Pinus massoniana forest had higher activity of cellulase and invertase, while the soil of leguminous plantation had higher urease, protease and catalase activity. Soil respiration intensity to Acacia mangium forest and mixed forest as high, pure eucalyptus forest is low. After five years of land reclamation and afforestation, the micro-ecological environment in the soil has been greatly improved. This change is fully reflected by the characteristics of underground microorganisms and the biomass of trees on the ground. However, the quantity and biochemical activity of soil microbes in uncultivated wasteland are still At a low level of recession.