J. Wang

Chinese Academy of Sciences

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Anna Ma

Chinese University of Hong Kong

Yunpeng Wang

Shanghai Jiao Tong University

Xin Li

Chinese Academy of Sciences

Xiangqian Li

Jiangsu Provincial Institute of Geological Survey

Frank Veroustraete

University of Antwerp

Zhenhong Li

Chang'an University

Lingwen Lu

University of Nottingham Ningbo China

E. Kang

National Taiwan Ocean University

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Chinese Academy of Sciences

University of Chinese Academy of Sciences

Ministry of Natural Resources

Ministry of Education of the People's Republic of China

Chinese University of Hong Kong

Institute of Geographic Sciences and Natural Resources Research

Shanghai Jiao Tong University

Guangzhou Institute of Geochemistry

Institute of Mechanics

Beihang University

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Land-use change analysis in Yulin prefecture, northwestern China using remote sensing and GIS

International Journal of Remote Sensing (2004)

Zhenhong Li Xiangqian Li Yunpeng Wang Anna Ma J. Wang

Rapid land-use change has taken place in many arid and semi-arid regions of China such as Yulin prefecture over the last decade due to rehabilitation measures. In this paper, land-use change dynamics were investigated by the combined use of satellite remote sensing and geographical information systems (GIS). Our objectives were to determine land-use transition rates among land-use types in Yulin prefecture over 14 years from 1986-2000 and to quantify the changes of various landscape metrics using FRAGSTATS, the spatial pattern analysis program for Categorical Maps. Using 30-m resolution Landsat Thematic Mapper (TM) data from the Institute of Remote Sensing Application (IRSA) in China, we classified images into six land-use types: cropland, forestland, grassland, water, urban and/or built-up land, and barren land. Significant changes in land-use occurred within the area over the study period. The results show the significant decrease in barren land was mainly due to conversion to grassland. Cropland increased by 3.39%, associated with conversions from grassland and barren land. The landscape has become more continuous, clumped and more homogeneous. The study demonstrates that the integration of satellite remote sensing and GIS was an effective approach for analysing the direction, rate and spatial pattern of land-use change.

Thematic Mapper

Thematic map

10.1080/01431160412331291206

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Analysing the forcing mechanisms for net primary productivity changes in the Heihe River Basin, north‐west China

International Journal of Remote Sensing (2009)

Lingwen Lu Xin Li Frank Veroustraete E. Kang J. Wang

Most of the inland river basins in north‐west China have experienced ecosystem degradation and even desertification in the last few decades. As a case study, we estimated the net primary productivity (NPP) of the Heihe river basin and analysed its difference between 2002 and 1998 by using the C‐Fix, a Monteith type parametric NPP model. The data used include the normalized difference vegetation index (NDVI) derived from the 1‐km SPOT/VEGETATION sensor and other environmental records. By obtaining the spatiotemporal patterns of NPP change as well as land use changes from higher resolution imagery in the basin, we identified its forcing factors in terms of climate change and human activities. We suggest that a decline in rainfall over the five years was one reason for NPP decrease in the basin. Other factors, such as irrational reclamation upstream and intensive development of irrigated farmland in the midstream play more important roles. They reinforce water competition between artificial and natural ecosystems over the whole basin. It is also found that human activities can produce very different NPP changes in a short time in mountainous regions. The NPP decreased in the east Qilian Mountains due to farmland reclamation and overgrazing but increased in the west, according to the ecosystem preserve project.

Desertification

Steppe

10.1080/01431160802438530

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Citations (25)