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Journal of Geographical Sciences    2014, Vol. 24 Issue (4) : 593-611     DOI: 10.1007/s11442-014-1108-0
Research Articles |
Grassland coverage inter-annual variation and its coupling relation with hydrothermal factors in China during 1982-2010
Wei ZHOU1(),Chengcheng GANG1,Yizhao CHEN1,Shaojie MU1,Zhengguo SUN2,Jianlong LI1,*()
1. School of Life Science, Nanjing University, Nanjing 210093, China
2. College of Animal Sciences, Nanjing Agricultural University, Nanjing 210095, China
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Abstract  

GIMMS (Global Inventory Modeling and Mapping Studies) NDVI (Normalised Difference Vegetation Index) from 1982 to 2006 and MODIS (Moderate Resolution Imaging Spectroradiometer) NDVI from 2001 to 2010 were blended to extract the grass coverage and analyze its spatial pattern. The response of grass coverage to climatic variations at annual and monthly time scales was analyzed. Grass coverage distribution had increased from northwest to southeast across China. During 1982-2010, the mean nationwide grass coverage was 34% but exhibited apparent spatial heterogeneity, being the highest (61.4%) in slope grasslands and the lowest (17.1%) in desert grasslands. There was a slight increase of the grass coverage with a rate of 0.17% per year. Increase in slope grasslands coverage was as high as 0.27% per year, while in the plain grasslands and meadows the grass coverage increase was the lowest (being 0.11% per year and 0.1% per year, respectively). Across China, the grass coverage with extremely significant increase (P<0.01) and significant increase (P<0.05) accounted for 46.03% and 11% of the total grassland area, respectively, while those with extremely significant and significant decrease accounted for only 4.1% and 3.24%, respectively. At the annual time scale, there are no significant correlations between grass coverage and annual mean temperature and precipitation. However, the grass coverage was somewhat affected by temperature in alpine and sub-alpine grassland, alpine and sub-alpine meadow, slope grassland and meadow, while grass coverage in desert grassland and plain grassland was more affected by precipitation. At the monthly time-scale, there are significant correlations between grass coverage with both temperature and precipitation, indicating that the grass coverage is more affected by seasonal fluctuations of hydrothermal conditions. Additionally, there is one-month time lag-effect between grass coverage and climate factors for each grassland types.

Keywords grass coverage      climate factors      spatial-temporal dynamic      correlation      time lag effect     
Fund:The National Natural Science Foundation of China, No.41271361.National Basic Research Program of China, No.2010CB950702.The APN Projects, No.ARCP2013-16NMY-Li.The Public Sector Linkages Program supported by AusAID, No.64828.China’s High-tech Special Projects, No.2007AA10Z231
Corresponding Authors: Jianlong LI     E-mail: zhouw866@163.com;jianlongli@gmail.com;jlli2008@nju.edu.cn
About author: Zhou Wei (1985-), PhD, specialized in application of remote sensing and terrestrial ecosystem carbon cycle. E-mail: zhouw866@163.com
Issue Date: 09 July 2015
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Wei ZHOU
Chengcheng GANG
Yizhao CHEN
Shaojie MU
Zhengguo SUN
Jianlong LI
Cite this article:   
Wei ZHOU,Chengcheng GANG,Yizhao CHEN, et al. Grassland coverage inter-annual variation and its coupling relation with hydrothermal factors in China during 1982-2010[J]. Journal of Geographical Sciences, 2014, 24(4): 593-611.
URL:  
http://www.geogsci.com/EN/10.1007/s11442-014-1108-0     OR     http://www.geogsci.com/EN/Y2014/V24/I4/593
Figure 1  The regression analysis between MODIS NDVI and GIMMS NDVI
Month Temperature (℃) (n=720) Precipitation (mm) (n=720)
Mean error RMSE R2 Mean error RMSE R2
Jan 0.006 0.958 0.958 0.289 0.987 0.809
Feb -0.073 0.985 0.935 0.351 1.425 0.815
Mar -0.115 0.937 0.859 0.509 0.958 0.931
Apr -0.136 0.883 0.821 3.149 1.491 0.799
May -0.124 0.925 0.842 0.438 1.677 0.839
Jun -0.108 0.960 0.869 1.758 0.975 0.877
Jul -0.113 0.883 0.894 -10.026 1.709 0.841
Aug -0.095 0.908 0.886 -7.659 1.506 0.792
Sep -0.098 0.976 0.893 -4.742 0.997 0.828
Oct -0.085 0.950 0.897 2.768 1.302 0.817
Nov 0.028 0.875 0.927 0.481 1.146 0.784
Dec 0.008 0.887 0.953 -0.447 1.030 0.803
Table 1  Error analysis for the interpolated meteorological data, using year 2001 as an example
Figure 2  Location of the study area and its grassland type distribution
Figure 3  Correlation analysis of the estimated grass coverage and its field observed values
Figure 4  Spatial distribution of the mean grass coverage from 1982 to 2010 in China
Percentage
(%)
Alpine sub-alpine
meadow
Slope
grassland
Plain
grassland
Desert
grassland
Meadow Alpine sub-alpine
grassland
Total
grassland
ESD 5.53 1.64 5.26 2.76 6.27 1.22 4.10
SD 4.05 1.68 3.75 2.35 5.30 1.12 3.24
NSD 13.84 8.23 17.61 10.85 23.78 6.47 13.80
NSI 19.90 18.46 23.96 22.69 27.13 18.72 21.83
SI 9.85 11.63 9.55 11.97 8.35 15.02 11.00
ESI 46.83 58.36 39.87 49.39 29.17 57.46 46.03
Table 2  Results of implementation of the grass coverage change significant test for different grassland types
Figure 5  Dynamics of the China’s grassland coverage from 1982 to 2010. Pattern of the grass coverage change (a), spatial distribution of significant test in China (b), the grade percentage of significant change of different types of grass coverage (c), and the nationwide inter-annual change of grass coverage (d)
Figure 6  Changing trends of annual mean temperature and total precipitation in China from 1982 to 2010
Figure 7  Correlations of grass coverage in China with temperature (a), and precipitation (b) from 1982 to 2010
Figure 8  Distribution of correlation coefficient of temperature, precipitation and grassland coverage of different grassland types (a. denotes alpine and sub-alpine meadow; b. denotes slope grassland; c. denotes plain grassland; d. denotes desert grassland; e. denotes meadow; f. denotes alpine and sub-alpine grassland)
Figure 9  Correlation coefficients between current month’s grass coverage and the current month’s temperature (a), the former one month’s temperature (b), the former two months’ temperature (c), and the former three months’ temperature (d)
Figure 10  Correlation coefficients between current month’s grass coverage and the current month’s precipitation (a), the former one month’s precipitation (b), the former two months’ precipitation (c), and the former three months’ precipitation (d)
Figure 11  Correlation coefficients between current months’ grass coverage for different grassland types and the current month’s, former one month’s, former two months’ and former three months’ temperature (a) and precipitation (b)
Temperature Current
month’s
Former one
month’s
Former two
months’
Former three
months’
Alpine sub-alpine meadow 0.82 0.92 0.74 0.28
Slope grassland 0.83 0.90 0.68 0.07
Plain grassland 0.83 0.91 0.71 0.20
Desert grassland 0.71 0.85 0.75 0.42
Meadow 0.88 0.93 0.68 0.11
Alpine sub-alpine grassland 0.76 0.90 0.81 0.47
Total grassland 0.80 0.90 0.74 0.29
Table 3  Correlation coefficients between current month’s grass coverage for different grassland types and the current month’s, former one month’s, former two months’ and former three months’ temperature
Precipitation Current month’s Former one month’s Former two months’ Former three months’
Alpine sub-alpine meadow 0.81 0.85 0.49 0.11
Slope grassland 0.71 0.74 0.61 0.06
Plain grassland 0.80 0.82 0.53 0.04
Desert grassland 0.64 0.69 0.55 0.03
Meadow 0.84 0.83 0.54 0.19
Alpine sub-alpine grassland 0.70 0.75 0.51 0.15
Total grassland 0.76 0.79 0.56 0.07
Table 4  Correlation coefficients between current month’s grass coverage for different grassland types and the current month’s, former one month’s, former two months’ and former three months’ precipitation
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