对陕北退耕还林还草的调查与思考

蒙忠祺;向立;周亚奇

Investigation and Thinking of Reforestation and Grass Plantation on Cultivated Land in Northern Shaanxi

MENG Zhong-qi;XIANG Li;ZHOU Ya-qi

人民黄河 . 2000, (5): 21 -22 .