Variation of desert and sandy field in China on the basis of remote sensing analysis and the relationship with climate change during 1992-2015

doi:10.7522/j.issn.1000-694X.2019.00044

Journal of Desert Research ›› 2020, Vol. 40 ›› Issue (1): 57-63.DOI: 10.7522/j.issn.1000-694X.2019.00044

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Variation of desert and sandy field in China on the basis of remote sensing analysis and the relationship with climate change during 1992-2015

Chang Xi, Lu Huayu, Lü Nana, Cui Mengchun, Li Haiyu

School of Geography and Ocean Science/Jiangsu Provincial Collaborative Innovation Center of Climate Change, Nanjing University, Nanjing 210023, China

Received:2019-04-01 Revised:2019-04-15 Online:2020-01-20 Published:2020-01-18

Abstract

Abstract: Assessment of climatic change impact on desert/sandy filed has attracted a widely attention, however there has not an interannual time series of the desert/sandy filed variations of the recent years in Northern China. In this study we used 1 km-resolution land cover and land use data to calibrate the 1992-2015 CCI-LC data to obtain the annual variations of desert/sandy field in Northern China during 1992-2015. Accuracy of the corrected desert/sandy field area was verified by the interpretation results of the remote sensing images of Tengger Desert in 2000 and 2002. Then, forcing mechanism of climate change on desert/sandy filed area variations was analyzed. Our results show that the total desert/sandy field area in Northern China decreased by 86 704 km² during 1992-2015, the reduction of desert/sandy field area in East Asian Monsoon zone is the most significant in which 18.13% desert/sandy field turned greening, followed by the Qinghai-Tibetan High and Cold zone (reduced desert/sandy field area of 46 109 km²), and the Northwest Arid zone (reduced desert/sandy field area of 23 470 km²), respectively. Soil moisture in the Northwest Arid zone and Qinghai-Tibetan High and Cold zone is the key factor on controlling the interannual variation of desert/sandy field area. Precipitation, relative humidity and soil humidity have a direct impact on variation of the desert/sandy field in the monsoon dominated climate region, but the forestry ecological construction projects, restoring farmland to forests and grassland and other measures also have a certain effect on the bare dunes greening. Moreover we found human protection and the decrease of wind speed are the predominated factors that modulated the reduction of desert and sandy field in Northern China in the recent 20 years.

Key words: desert/sandy field in China, area variation, interpretation of remote sensing images, climate change effect, data of land cover

CLC Number:

P931.3

Chang Xi, Lu Huayu, Lü Nana, Cui Mengchun, Li Haiyu. Variation of desert and sandy field in China on the basis of remote sensing analysis and the relationship with climate change during 1992-2015[J]. Journal of Desert Research, 2020, 40(1): 57-63.

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Variation of desert and sandy field in China on the basis of remote sensing analysis and the relationship with climate change during 1992-2015

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