关键词: 农村生活非点源污染, 农村生活非点源污染, 污染负荷, 总磷, 总氮, 化学需氧量

Abstract: To study current ecological situation of soil in different forest types and provide basic data and instruction for management and protection of forest resources, and further understand forest ecosystem, the methods of field investigation and laboratory testing were adopted to analyze soil nutrients and their distribution characteristic in three forest communities (mountainous rainforest, tropical rainforest and monsoon evergreen broad leaved forest) in the Naban Basin Nature Reserve. The results showed that all soils were acidic and slightly acidic, the nutrients were rich, but the contents of total phosphorus, total potassium and available phosphorus were low; the organic matter content followed an order of mountainous rainforest＞ monsoon evergreen broad leaved forest＞ tropical rainforest; the contents of total nitrogen were in great difference, which were in an order of mountainous rainforest＞ tropical rainforest＞ monsoon evergreen broad leaved forest; the contents of soil total phosphorus, total potassium and available potassium were in great difference, all followed an order of tropical rainforest＞ mountainous rainforest＞ monsoon evergreen broad leaved forest; the contents of organic matter, total nitrogen and hydrolyzable nitrogen in all forests decreased progressively with the increases of soil depth, the variation of the contents of total phosphorus and total potassium was not significant in different soil layers; under different forest communities, the organic matter content was closely related with the contents of nitrogen, phosphorus and available potassium.