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地理学报  2012 

中国传统农区过去300年耕地重建结果的对比分析

DOI: 10.11821/xb201209004, PP. 1190-1200

Keywords: 耕地数据集,分析对比,中国传统农区,过去300年

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Abstract:

土地覆被变化是气候与生态效应模拟研究的重要参量。SAGE和HYDE两个全球历史土地利用数据集在相关研究中得到广泛应用,但在区域尺度上的应用,其可靠性如何,至今少有论及。以我国学者重建的传统农区历史耕地数据集(CHCD)为基础,从全区、省区和网格(60km×60km)三个空间尺度,对SAGE(2010)和HYDE3.1数据集中有关中国传统农区历史耕地重建结果进行对比分析,结果表明(1)SAGE(2010)数据集对中国传统农区耕地数量重建是以单一线性插补而得,其中1700-1950年是以0.51%的年均增长率线性递增,1950年后是以0.34%年均速率线性递减,这种“标准化”变化趋势不能客观反映传统农区土地垦殖的真实历史,耕地面积也明显高估,与CHCD数据集不具有可比性;(2)HYDE3.1数据集吸纳了区域性研究成果,使其在总量上与CHCD数据集较为接近,具有较好的可比性,但其在省区和网格尺度上与CHCD存在显著差异,其中相对差异率超过70%(70%)的网格占比高达56%~63%,超过90%(90%)的网格占比也高达40%~45%;而相对差异率介于-10%~10%的网格占比仅为5%~6%,介于-30%~30%的网格占比也仅为17%左右;(3)充分利用我国丰富的历史文献,建立更高精度的中国区域历史土地利用数据集,是提高区域气候与生态效应模拟研究质量的重要保障。

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