间伐强度对塞罕坝华北落叶松人工林生长进程和生物量的影响
간벌강도대새한패화북락협송인공림생장진정화생물량적영향
Effects of Thinning Intensity on the Growth and Biomass of Larix principis-rupprechtii Plantation in Saihanba,Hebei Province
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