Regional Sustainability ›› 2021, Vol. 2 ›› Issue (1): 36-46.doi: 10.1016/j.regsus.2021.01.002cstr: 32279.14.j.regsus.2021.01.002
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Peng He, Lishuai Xu*(), Zhengchun Liu, Yaodong Jing, Wenbo Zhu
Received:
2020-09-02
Revised:
2020-12-31
Accepted:
2021-01-15
Published:
2021-01-20
Online:
2021-03-11
Contact:
Lishuai Xu
E-mail:sdytxu@126.com
Peng He, Lishuai Xu, Zhengchun Liu, Yaodong Jing, Wenbo Zhu. Dynamics of NDVI and its influencing factors in the Chinese Loess Plateau during 2002-2018[J]. Regional Sustainability, 2021, 2(1): 36-46.
Fig. 4.
Mann-Kendall mutation test of NDVI in the CLP (a), as well as in different vegetation cover types (crops (b), steppes (c), scrub (d), broadleaved forests (e), desert (f), meadows (g), grasses (h), and coniferous forests (i)) from 2002 to 2018. The black dotted line represents the critical value at the 5% significance level (±1.96). UFk and UBk represent forward sample sequence statistics and reverse sample sequence statistics, respectively."
Table 1
Linear regression between NDVI and time series for different vegetation cover types."
Vegetation cover type | Area percentage (%) | Regression equation | R2 | P | Increasing contribution rate (%) |
---|---|---|---|---|---|
Crops | 44.99 | y=0.006x-12.193 | 0.814 | 0.01 | 50.97 |
Steppes | 24.40 | y=0.005x-9.965 | 0.502 | 0.01 | 23.04 |
Scrub | 7.61 | y=0.005x-8.879 | 0.870 | 0.01 | 7.18 |
Broadleaved forests | 5.69 | y=0.004x-6.641 | 0.860 | 0.01 | 4.30 |
Deserts | 5.16 | y=0.004x-8.517 | 0.342 | 0.01 | 3.90 |
Meadows | 4.35 | y=0.003x-6.005 | 0.701 | 0.01 | 2.46 |
Grasses | 4.15 | y=0.007x-13.488 | 0.887 | 0.01 | 5.49 |
Coniferous forests | 3.15 | y=0.004x-8.159 | 0.924 | 0.01 | 2.38 |
Others | 0.50 | y=0.003x-5.531 | 0.653 | 0.01 | 0.28 |
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