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根据野外调查和土壤理化分析、差热分析。X射线分析等资料,说明西天目山南坡土壤具明显富铝化特征,硅铝率2左右,粘土矿物以高岭石为主,并含较多三水铝矿,酸性强、活性铝含量较高,土壤剖面呈明显的黄化特征,故统属黄壤类土壤。从山顶到山麓又可续分为山地漂灰黄壤、山地表潜黄壤和山地黄壤等亚类。 从1959和1980年两次相距21年的观察和测定,说明西天目山森林生态系统处于缓慢的动平衡中。森林生物群落主组分生物量的增长,导致森林郁闭度、残落物和土壤蓄水量的增长,自然水不断对土壤进行盐基淋洗和酸化作用,而土壤的变化又反过来影响森林群落的组成和结构。
According to field investigation and soil physical and chemical analysis, differential thermal analysis. X-ray analysis and other data, indicating that the south slope of the western slope of the mountain with significant Al-rich features of aluminum, silica-alumina rate of about 2, mainly kaolinite clay minerals, and more gibbsite, acidic, more active aluminum content High, the soil profile was obvious yellowing characteristics, so the system belongs to yellow soil soil. From the summit to the foothills can be further divided into mountain ash-yellow soil, submarine surface sub-yellow soil and yellow soil and other sub-categories. From 2159 observations and measurements made twice in 1959 and 1980, it shows that the forest ecosystem in West Tienmu Mountain is in slow balance. The increase in biomass of the main components of the forest biome led to an increase in forest canopy density, debris and soil water retention. Natural water continued to salt-wash and acidify the soil, which in turn affected the soil Composition and structure of forest communities.