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Influence of limestone powder doses on fine root growth of seriously damaged forests of Pinus massoniana in the acid rain region of Chongqing, China Response of Fine Root Characteristics of Pinus massoniana to the Doses of\n Limestone Powder Mixed in Soil in the Acid Rain Area of Chongqing, China Influence of Limestone Powder Doses on Growth of Schima superba in Pinus massoniana Plantation in the Acid Rain Region of Chongqing, China