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湖南省林地主要分布在中亚热带低山丘陵,属中亚热带常绿阔叶林地带,多为混交次生林,年平均气温16—18℃,≥10℃积温为5000—5800℃,年降水量为1200—1700毫米,属亚热带温暖湿润气候,林地主要土壤为红壤、黄壤及黄棕壤(大部分肥力较高,有机质1—5％),多为微酸性至酸性,一般质地较轻,通透性较强,林木生长繁茂,形成了多层次的森林结构。由于森林的郁闭,形成了林下特有的水热条件,少或无直线光的生境,使林地微生物活动非常旺盛,与林木其生非常活跃,其中主要是根瘤与菌根。在
The forest land in Hunan Province is mainly distributed in the subtropical hilly region, belonging to the subtropical evergreen broad-leaved forest, mostly mixed secondary forests, the annual average temperature is 16-18 ℃, the accumulated temperature is ≥5-500 ℃ and the annual precipitation is 1200 -1700 mm, subtropical humid and humid climate, the main forest soil is red soil, yellow soil and yellow brown soil (most fertile, 1-5% organic matter), mostly acidic to slightly acidic, the general texture of light, permeability Strong, lush forest growth, the formation of a multi-level forest structure. Owing to the closed canopy, the unique hydrothermal conditions are formed in the forest, and the habitats with little or no direct light make the woodland microbial activities very vigorous. The forest and its woods are very active, mainly nodules and mycorrhizae. in