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关于养分增加和流失的知识,基于对森林生态系统中养分循环的理解.由于养分的流失能改变森林的生产能力或造成水体的富营养化,考察这些过程对造林和环境都是必要的.对于提供全国现在木材需要量45%,并须加强管理和正确采伐以应付今后的需要.南部森林的养分活动状态,现在还了解得不多.对于造林地来说,研究森林采伐前、采伐中和采伐后养分的增加和减少,对于林地水源质量标准的改进是有帮助的.这项研究的目的是决定来自不同土壤类型和水文特点的五条林区小流
Knowledge of nutrient uptake and loss is based on an understanding of the nutrient cycle in forest ecosystems and the process of afforestation and the environment is necessary to examine these processes as nutrient loss can alter forest productivity or cause eutrophication of water bodies Providing 45% of the country’s timber demand now, and to strengthen management and correct logging to meet the future needs of the activities of the southern forest nutrient status, and now do not know much.For the afforestation, the study of forest harvesting, harvesting and The increase and decrease of nutrients after harvesting is helpful for improving the quality standard of forestland water sources.The purpose of this study is to determine the effects of small streams from five forest types with different soil types and hydrological characteristics