【摘要】 通过对东北东部帽儿山区人工落叶松纯林土壤肥力和养分循环过程的研究,揭示出落叶松人工林潜在地力的衰退趋势;从物种多样性原理和系统养分循环特点出发,浅析了地力衰减的原因,并提出了相应的防治对策。建议改造树种单一、结构简化的大面积针叶纯林为多物种、多层次的混交林,或小面积块状混交和不同树种林分间的轮作。通过生物自肥过程,实现系统的自我调节,从而维持长期稳定的土壤肥力和生物生产力。更多还原

【Abstract】 Based on studies of the soil fertility and the processes of biological cycling of nutrient clements in larch plantation ecosystem, the potential soil degradation and unstability were revealed, and the mechanism and causes of soil degradation were analyzed according to the principles of biodiversity and the trait of nutrient cycling. Mean-while, the countermeasures against soil degradation were put forward. It is suggested that a large scale man-made coniferous pure stand with single tree speciesand simplified structure should be replaced by planting coniferous/boardlcaved mixed forests tree spccicsand multiple layers structure, or by many patches of different pure stands, and rotation among different trees should be adopted instead of coniferous cropping, in order? to sustain a long-term and stable soil fertility and forest productivity through the processes.更多还原