How much are US households prepared to pay to manage and protect whitebark pine (Pinus albicaulis Engelm.)? [0.03%]
美国居民管理及保护白皮松（Pinus albicaulis）的意愿支付额是多少？
Helen T Naughton,Kendall A Houghton,Eric D Raile et al.
Helen T Naughton et al.
The whitebark pine (Pinus albicaulis Engelm.) tree species faces precipitously declining populations in many locations. It is a keystone species found primarily in high-elevation forests across the Western US. The species is an early respon...