JOURNAL OF NATURAL RESOURCES ›› 2013, Vol. 28 ›› Issue (8): 1373-1382.doi: 10.11849/zrzyxb.2013.08.010

• Resources Evaluation • Previous Articles     Next Articles

Cropland Dynamics and Its Influence on the Productivity in Recent 20 Years in Northern Shaanxi, China

LIU Wen-chao1 2, YAN Chang-zhen1, QIN Yuan-wei2 3, YAN Hui-min3, LIU Ji-yuan3   

  1. 1. Cold and Arid Regions Environmental and Engineering Research Institute, CAS, Lanzhou 730000, China;
    2. University of Chinese Academy of Sciences, Beijing 100049, China;
    3. Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China
  • Received:2012-11-05 Revised:2013-01-29 Online:2013-08-20 Published:2013-08-19
  • Contact: 颜长珍,男,研究员,博士生导师,研究方向为资源环境遥感。E-mail: yancz@lzb.ac.cn E-mail:yancz@lzb.ac.cn

Abstract: Cropland reclamation and ecological protection and construction programs in Northern Shaanxi, China, have significant impact on the spatial distribution patterns of cropland and its productivity. In this paper, cropland dynamics from medium and high resolution remote sensing images (Landsat TM/ETM+) of recent 20 years (from the end of the 1980s to 2010) were generated by image interpretation. Furthermore, by using GLO-PEM model and AGRO-VPM model, with medium resolution and long time series of remote sensing dataset (AVHRR/MODIS), Net Primary Productivity (NPP) and its change on cropland were accounted. Finally, the response of cropland change to productivity was analyzed. The result shows that during the former decade of the research period, cropland area and its productivity in Northern Shaanxi experienced a small fillip, while in the latter decade both area and NPP were significantly reduced. The main cause for cropland decrease was the implementation of the Grain for Green Program. Besides, urbanization was also a key factor. Overall, in the past 20 years, the total area of cropland in Northern Shaanxi decreased by 42.56%, and cropland NPP dropped by 41.90% over the same period. This study is of great importance to the assessment of regional cropland security and food security, and also the planning of regional land use scientifically.

Key words: cropland, cropland change, Northern Shaanxi, remote sensing, NPP

CLC Number: 

  • F301.2