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Geoarchaeological evidence from Angkor, Cambodia, reveals a gradual decline rather than a catastrophic 15th-century collapse 期刊论文
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 2019, 116 (11) : 4871-4876
作者:  Penny, Dan;  Hall, Tegan;  Evans, Damian;  Polkinghorne, Martin
收藏  |  浏览/下载：12/0  |  提交时间：2019/11/27
Angkor  collapse  Cambodia  archaeology  
Policy distortions, farm size, and the overuse of agricultural chemicals in China 期刊论文
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 2018, 115 (27) : 7010-7015
作者:  Wu, Yiyun;  Xi, Xican;  Tang, Xin;  Luo, Deming;  Gu, Baojing;  Lam, Shu Kee;  Vitousek, Peter M.;  Chen, Deli
收藏  |  浏览/下载：9/0  |  提交时间：2019/11/27
crop yield  environmental protection  fertilizer use efficiency  socioeconomic barriers  urbanization