TY - JOURNAL OF NATURAL RESOURCES A1 - ZHANG Zhi-qiang, XU Zhong-min, LONG Ai-hua, GONG Zeng-tai T1 - Measuring the economic value of restoring ecosystem services in Zhangye city of Heihe river basin—Comparison and application of continuous and discrete contingent valuation survey Y1 - 2004-04-25 00:00:00.0 JF - JOURNAL OF NATURAL RESOURCES JO - JOURNAL OF NATURAL RESOURCES SP - 230 EP - 239 VL - 19 IS - 2 UR - {https://www.jnr.ac.cn/EN/10.11849/zrzyxb.2004.02.014} N1 - 10.11849/zrzyxb.2004.02.014 ER -