过去百年青海和西藏耕地空间格局重建及其时空变化

doi:10.11820/dlkxjz.2015.02.008

Abstract

Abstract:

Since numerical simulation has become a popular method for studying the effects of land use and land cover change on climate and environment, spatially explicit historical cropland datasets are increasingly required in regional and global climate change and carbon cycle research. In this study, using historical population data as a proxy, we estimated the provincial cropland area of Qinghai and Tibet in 1910. Based on the statistical data of the National Bureau of Statistics of China, the survey data of the Ministry of Land and Resources, and the results of some previous studies, we revised the cropland area of Qinghai and Tibet in 1950-2000. The relationship between altitude and surface slope and cropland distribution were quantified to develop the spatially explicit reconstruction model of historical cropland at a resolution of 1 km×1 km. Since the cropland area reached the maximum in the 1980s, the satellite-observed cropland distribution extent of this time period was taken as the maximum distribution extent of historical cropland. The model developed in this research was used to reconstruct the spatial patterns of cropland in Qinghai and Tibet in 1910, 1960, 1980, and 2000. The reconstruction results show that: (1) in 1910-1950, cropland area of Qinghai-Tibet was stable, while in 1950-1980 cropland area increased rapidly, reaching 10583 km², which is the maximum of the entire study period; in 1980-1990, cropland area decreased slightly; and in 1990-2000, cropland area increased slightly; (2) with regard to its spatial distribution, in 1910-1960, cropland expanded and land use activities intensified greatly in the Yellow River-Huangshui River Valley (YHV); in 1960-1980, cropland expansion and land use intensification occurred in the YHV, the Yarlung Zangbo River, the Nianchu River, and the Lhasa River valleys; in 1980-2000, the spatial pattern of cropland in Qinghai and Tibet remained unchanged. By comparing the reconstruction results of this study for 2000 with satellite-observed cropland distribution of the same year, we found that the correlation coefficient was 0.92 and the absolute difference followed normal distribution. The percentage of grid cells where the absolute difference is low (-10% to 10%) reached 73.29%, while the percentage of grid cells where the absolute difference is high (>40% or <-40%) was 1.94%. Incorporating more information on historical population and cropland of Qinghai and Tibet will help improve the accuracy of our reconstruction modeling. The reconstruction results of this research can be used in regional climate models to study the impact of cropland cover change on the climate and carbon cycle.

Key words: cropland, estimation and revision, spatially explicit reconstruction, past one hundred years, Qinghai and Tibet

Shicheng LI, Yili ZHANG, Fanneng HE. Reconstruction of cropland distribution in Qinghai and Tibet for the past one hundred years and its spatiotemporal changes[J].PROGRESS IN GEOGRAPHY, 2015, 34(2): 197-.

Figures/Tables 8

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年份	1910^a	1950^b	1960^b	1970^c	1980^c	1990^c	2000^b
青海	4467	4527	5530	6921	6850	6739	6875
西藏	1560	1620	1852	2631	3733	3681	3667
全区	6027	6147	7382	9552	10583	10420	10541

数据集来源	模型涵盖限制因子	源数据分辨率	重建空间分辨率/km	不同坡度(°)耕地面积占比/%					不同高程(km)耕地面积占比/%
数据集来源	模型涵盖限制因子	源数据分辨率	重建空间分辨率/km	≤2		2~6	6~15	>15	≤2	2~3	3~4	>4
本文	高程、坡度	省域/约72.23万km²	1	24.1	60.7	15.0	0.1		8.3	79.2	12.5	0.0
罗静等(2014)	高程、坡度、气候、人口	县域/平均0.24万km²	2	23.0	62.1	14.8	0.2		3.2	85.6	11.2	0.0
Li等(2015)	高程、坡度、气候	省域/约72.23万km²	10	14.4	59.0	26.3	0.4		5.5	69.7	24.1	0.8

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Reconstruction of cropland distribution in Qinghai and Tibet for the past one hundred years and its spatiotemporal changes

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