在线看一区二区,国产精品 久久久久久久,夜夜久久av,重口味一区二区

當前位置: > 學術(shù)報告 > 文科 > 正文

文科

Spatial Distribution of Urbanization and Agricultural Suitability: A Historical Global Analysis

發(fā)布時間:2015-01-21 瀏覽:

講座題目:Spatial Distribution of Urbanization and Agricultural Suitability: A Historical Global Analysis

講座人:李曉飛 博士

主持人:史耀疆 教授

講座時間:09:30

講座日期:2015-1-21

地點:長安校區(qū) 文瀾樓C段3512室

主辦單位:教育實驗經(jīng)濟研究所

講座內(nèi)容: A conventional viewin the narrative economic history literature believes that, the geographical distributionof urbanization was highly dependent on local agricultural land quality inearly periods, while this dependency relationship is much weaker in moderntimes. This study quantitatively assesses this historical trend of man'schanging relation to land. We examine the global urban population in grid cellsof 0.5 degree longitude and latitude resolution, and relates it to anagricultural suitability index by the spatial negative binomial regressionmodel. The model also controls for other physical geographic factors, spatialinterdependence between urban areas, and region fixed effects. The estimationis repeated at different points in time from 1000 to 2000 CE through a multiplecross-sectional regressions setup. The results show that the correlationbetween urban population and agricultural suitability first increased in earlyhistory (before 1500 CE), and then decreased over time. Thefirst-rising-then-falling pattern persists to various robustness checks. Itprovides empirical evidence for the declining importance of fertile lands indetermining locations of urbanization as technologies and societies developedover time.

高清一二三区不卡视频在线观看| 欧美精品综合一区中| 黄片av一级片| 乱干视频网站| 欧美激情国产在线视频| 好屌妞这里都是精品网站| 国产成人A∨天堂| 欧美亚洲在在线视频| 69视频在线观看大全| AV综合色国产在线观看| 欧美综合区一区二区| 日国产小奶子女人视频| 亚洲婷婷五月天激情| 日本三级欧美三级久久久久| 日本一区五区 在线| 夜夜操亚洲| 天天干天天爽红桃视频| 邪恶黄a在线播放观看| 好屌妞精彩视频| 在线观看日韩一区二区| 精品人妻少妇嫩草无码专区| 成人性爱欧美日韩在线免费观看| 亚洲一区二区porn| AV操b多人| 做暖视频试看日本一区| 日本在线中文字幕潮吹| 免费黄色日韩欧美在线观看。| 久久大神在线| 亚洲中字无码日韩欧美| 人妻一区二区高清免费| 婷婷五月天无码在线| 日韩人妻精品无码一区二区三区| 日本国产xxxx| 亚洲国产沦理片| 真人日毴视频| 欧美日韩免费图片| 免费好好AV| AV不卡十八区| 国内av一区二区| 国产黄片一区二区免费| 欧美1级大黄片|