Journal of Geographical Sciences ›› 2014, Vol. 24 ›› Issue (4): 593-611.doi: 10.1007/s11442-014-1108-0
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Wei ZHOU1(), Chengcheng GANG1, Yizhao CHEN1, Shaojie MU1, Zhengguo SUN2, Jianlong LI1,*(
)
Received:
2013-12-27
Accepted:
2014-01-22
Online:
2014-04-20
Published:
2015-07-09
Contact:
Jianlong LI
E-mail:zhouw866@163.com;jianlongli@gmail.com;jlli2008@nju.edu.cn
About author:
Author: Zhou Wei (1985-), PhD, specialized in application of remote sensing and terrestrial ecosystem carbon cycle. E-mail:
Supported by:
Wei ZHOU, Chengcheng GANG, Yizhao CHEN, Shaojie MU, Zhengguo SUN, Jianlong LI. 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.
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Table 1
Error analysis for the interpolated meteorological data, using year 2001 as an example"
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 2
Results of implementation of the grass coverage change significant test for different grassland types"
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 |
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 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)"
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"
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 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"
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 |
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