落叶松人工林土壤肥力与防治地力衰退趋势的研究

Study on the Soil Fertility and Controllig the Degenerating Tendency for Productivity of Soil of Larch Plantations

从土壤养分、腐殖质、酶活性和微生物含量的变化，研究了落叶松纯林土壤衰退的问题。探讨了间伐、混交林和二代连栽对土壤肥力的影响。并对导致土壤衰退的原因进行了分析，提出了相应的防治对策。

In this paper,the probleln of soil degradation was studied inpure larch plantation, from soii nutrients,lumus, soil enzyme activity to soilmicroorganism content, At the same time,the influence on the soil fertilitywas discussed of intermediate cuttings,the second rotation stand and mixed fo-rest. The reasons of leading to soil degradation in pure larch plantations werediscussdand some appropriate control countermeasure were put forward.