Spatially explicit reconstruction of cropland cover in Europe from AD 1800 to 2000

IF 6 2区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY Science China Earth Sciences Pub Date : 2024-08-06 DOI:10.1007/s11430-023-1381-0
Jun Li, Yu Ye, Xiuqi Fang, Diyang Zhang, Zhilei Wu
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Abstract

One of the challenges in global change research is the significant uncertainty in global historical land use and land cover (LUCC) datasets, which are widely used as foundational data. In addition to the regional cropland area reconstructions, improving the grid allocation method is another feasible way to raise the reliability of historical LUCC data. In this study, an integrated reconstruction of the national cropland areas over the past 200 years was developed for 36 European countries. After that, the allocation algorithm was built using physiogeographic variables and historical city sites for accounting for land suitability and cultivation preferences, respectively. Finally, cropland data in Europe with a spatial resolution of 5′×5′ at five time sections from AD 1800 to 2000 were generated using the optimal allocation algorithm in accordance with the stages of the regional history. The results were as follows: (1) The dominant factors governing the distribution of croplands in Europe vary at different agricultural stages, but the results can be merged together. Land suitability was more optimal for allocation during the modern agricultural stage (AD 1950 and 2000); the priority index combined with land suitability and cultivation preference was more reasonable for allocation during the traditional agricultural stage (AD 1800). The average of the allocations by priority index and the land suitability could be adopted as the allocation results during the transitional stage (AD 1850 and 1900) because the grids for absolute differences within ±10 and ±20 percentage points between the results obtained from the above two allocations were above 80% and 95%, respectively, which means the two allocation results could be merged. (2) Over the past 200 years, the total cropland area in Europe first increased to a peak in AD 1900 and then decreased. Spatially, the centre of the higher cropland fraction shifted from the western part of Europe in AD 1800 to the eastern part of the continent after AD 1950. (3) Both the cropland area and the spatial distribution in this study are more reasonable than the global dataset HYDE3.2.

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公元 1800 年至 2000 年欧洲耕地覆盖的空间明确重建
全球变化研究面临的挑战之一是被广泛用作基础数据的全球历史土地利用和土地覆被数据集的严重不确定性。除区域耕地面积重建外,改进网格分配方法是提高历史土地利用和土地覆被数据可靠性的另一种可行方法。本研究对欧洲 36 个国家过去 200 年的耕地面积进行了综合重建。随后,利用自然地理变量和历史城址建立了分配算法,分别用于考虑土地适宜性和耕作偏好。最后,根据区域历史阶段,使用最优分配算法生成了公元 1800 年至 2000 年五个时间段、空间分辨率为 5′×5′ 的欧洲耕地数据。结果如下(1) 在不同的农业阶段,欧洲耕地分布的主导因素不同,但结果可以合并。在现代农业阶段(公元 1950 年和 2000 年),土地适宜性对耕地分配更为有利;在传统农业阶段(公元 1800 年),优先指数结合土地适宜性和种植偏好对耕地分配更为合理。在过渡阶段(公元 1850 年和 1900 年),可采用优先指数和土地适宜性分配的平均值作为分配结果,因为上述两种分配结果之间±10 个百分点和±20 个百分点的绝对差值网格分别在 80%和 95%以上,这意味着两种分配结果可以合并。(2)在过去的 200 年中,欧洲的耕地总面积先是增加到公元 1900 年的峰值,然后又有所减少。从空间上看,耕地比例较高的中心从公元 1800 年的欧洲西部转移到公元 1950 年后的欧洲东部。(3) 与全球数据集 HYDE3.2 相比,本研究的耕地面积和空间分布都更加合理。
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来源期刊
Science China Earth Sciences
Science China Earth Sciences GEOSCIENCES, MULTIDISCIPLINARY-
CiteScore
9.60
自引率
5.30%
发文量
135
审稿时长
3-8 weeks
期刊介绍: Science China Earth Sciences, an academic journal cosponsored by the Chinese Academy of Sciences and the National Natural Science Foundation of China, and published by Science China Press, is committed to publishing high-quality, original results in both basic and applied research.
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