Spatio-temporal Changes of NDVI and Climatic Factors of Grassland in Northern China from 2000 to 2012

Zhang Renping; Feng Qisheng; Guo Jing; Shang Zhenyan; Liang Tiangang

doi:10.7522/j.issn.1000-694X.2014.00130

Journal of Desert Research >

2015 , Vol. 35 >Issue 5: 1403 - 1412

DOI: https://doi.org/10.7522/j.issn.1000-694X.2014.00130

Spatio-temporal Changes of NDVI and Climatic Factors of Grassland in Northern China from 2000 to 2012

Zhang Renping ,
Feng Qisheng ,
Guo Jing ,
Shang Zhenyan ,
Liang Tiangang

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1. State Key Laboratory of Grassland Agro-ecosystems/College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou 730020, China;
2. General Grassland Station of Xinjiang, Urumqi 830049, China;
3. Xinjiang Academy of Forestry, Urumqi 830000, China

Received date: 2014-09-18

Revised date: 2014-12-05

Online published: 2015-09-20

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Abstract

Based on MODIS NDVI data, combined with average annual temperature (AAT) and annual precipitation (AP) collected from 187 meteorological reference stations from 2000 to 2012 in northern China, this paper analyzed the spatio-temporal characteristics of NDVI and dynamic change of AAT and AP in past 13 years. The result showed that: (1) The grassland in most study areas doesn't appear significant change trend, and the main type is desert grassland; From view of change region, the degraded region (accounting for 23.97% of the grassland in northern China) is slightly greater than that of improved region (accounting for 11.68% of the grassland in northern China), it's main type is shrubland and typical grassland. (2) The principal part of the grassland in northern China is stable relatively in recent 13 years, which accounts for 68.37%. Among them, the desert grassland has less change, and its area in relatively stable condition accounts for 79.73% of this type of grassland. The shrubland and typical grassland have great change, and account for 41.55% and 45.92%, and their area of the coefficient of variation less than 1.5 accounts for 91.42% in the past 13 years. This shows that most of grassland in northern China is in a relatively stable status. (3)The region with a slight increasing trend of the AAT is larger than that with a decreasing trend of the AAT. The area of increasing temperature accounts for 54.04% of the grassland in northern China, the maximum increasing magnitude of AAT is 0.159 ℃·a^-1; The region with increasing trend of the AP is significantly larger than that with a decreasing trend of the AP. The area of increasing precipitation accounts for 71.01% of the grassland in northern China, the maximum increasing magnitude of AP is 23.29 mm·a^-1.

Key words： grassland in northern China; NDVI; coefficient of variation

Cite this article

Zhang Renping , Feng Qisheng , Guo Jing , Shang Zhenyan , Liang Tiangang . Spatio-temporal Changes of NDVI and Climatic Factors of Grassland in Northern China from 2000 to 2012[J]. Journal of Desert Research, 2015 , 35(5) : 1403 -1412 . DOI: 10.7522/j.issn.1000-694X.2014.00130

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