Through analyzing the degradation index, this paper monitored and evaluated the black soil degradation in Dehui city.
本文通过对黑土退化指标进行分析，对吉林省德惠市的黑土退化进行监测与评价。
This paper details the change characters of black soil quality, and analyses the natural and artificial factors of black soil degradation.
详述了近几十年来黑土资源质量的变化特征，分析了黑土质量退化的各种自然与人为因素。
Through field investigation and soil fertility index analysis, causes and mechanism of fertility degradation of black soil in the Songliao Plain were explored.
通过田间调查和土壤肥力指标分析，探讨了松辽平原玉米带黑土肥力退化的原因和机理。
Through field investigation and soil fertility index analysis, causes and mechanism of fertility degradation of black soil in the Songliao Plain were explored.
通过田间调查和土壤肥力指标分析，探讨了松辽平原玉米带黑土肥力退化的原因和机理。
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