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研究了落叶松人工林、针阔混交林以及间伐抚育对土壤微生物含量和土壤酶活牲的影响，并探讨了落叶松人工林地力衰退趋势与生物活性变化的关系。
The effects of larch plantation, coniferous-broadleaved mixed forest and thinning and tending on soil microbial biomass and soil enzyme activity were studied. The relationship between the trend of decline of soil fertility and the biological activity was also discussed.