黑土土壤质量演变初探I——不同开垦年限黑土主要质量指标演变规律
흑토토양질량연변초탐I——불동개은년한흑토주요질량지표연변규률
An Approach to the Changes of Black Soil Quality (I) —— Changes of the Indices of Black Soil with the Year(s) of Reclamation
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