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东北黑土区小流域农业景观结构与土壤侵蚀的关系 Aromatic, Medicinal Plants and Vulnerability of Traditional Herbal Knowledge in a Berber Community o Ecological Reconstruction of the Loess Plateau and Research of Soil Erosion and Dryland Agriculture 南亚热带水土流失地区人工加速植被演替过程