人工林地力衰退机理及其防止对策

Depletion Mechanism of Forest Plantation Productivity and Preventive Strategy

本文分析了导致人工林地力衰退的因素，主要有：自然地理环境和生态系统固有的脆弱性；人工林植物群落的结构简单导致功能降低；土壤动物和微生物区系演变；土壤理化性质和生化特性变化；人工林对营养物质的消耗；营林生产活动的干扰等。

Abstract Depletion of forest plantation productivity has become a problem to be urgently resolved for sustainable development of forestry and be in common concerned by forestry organizations and foresters around the world. The factors, which lead to site depletion of plantations, mainly are inherent fragility that exists in ecological systems; simple structure of artificial plant community leading to the reduction of functions; evolution of the flora of soil animals and micro organism; the changes in physical and chemical properties of soil; nutrient loses and the disturbance of forest operations. A strategy to prevent the depletion in productivity of plantations is put forward, including regulation of stand structure, stimulating the development of understorey, improvement of biotic fertilization and environment quality, increasing nutrient elements, using shifting culture and proper soil management.