Conservation outcomes assessment of Sanjiangyuan alpine grassland with MODIS-EVI approach

doi:10.17520/biods.2017196

Abstract

Abstract:

The Sanjiangyuan Region is a priority area for ecosystem conservation in China. Since 2005, the government has contributed significant funding to implement ecological conservation and restoration to protect and restore the grasslands. This study correlated aboveground biomass (AGB) data from 248 sites scattered across the Sanjiangyuan Region with MODIS Enhanced Vegetation Index (EVI) data from 2000 to 2016 and utilized four regression models to estimate AGB by EVI. Results showed that power-function model worked best for grasslands in the Sanjiangyuan Region. Trend analysis showed no significant trends in 62% of the area of Sanjiangyuan, with 22% of the area, mainly distributed in the western and northern regions, increasing significantly and 16% of the area, sporadically located in the central and southern regions, decreasing significantly from 2000 to 2016. In general, the AGB of the entire area showed no significant increases or decreases with high annual fluctuations since 2000. However, there have been significant decreases since 2012. The AGB inside of the Sanjiangyuan Nature Reserve was lower than that found outside, and didn’t increase significantly during first-stage projects between 2005 and 2012, based on results from matching methods.

http://jtp.cnki.net/bilingual/detail/html/SWDY201802005

Key words: Sanjiangyuan Region, rangelands degradation, effectiveness assessment, nature reserve, biomass, MODIS-EVI

Ruiling Song, Hao Wang, Di Zhang, Zhi Lü, Ziyun Zhu, Lu Zhang, Yanlin Liu, gongbao Caiwen, Lan Wu. Conservation outcomes assessment of Sanjiangyuan alpine grassland with MODIS-EVI approach[J]. Biodiv Sci, 2018, 26(2): 149-157.

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URL: https://www.biodiversity-science.net/EN/10.17520/biods.2017196

https://www.biodiversity-science.net/EN/Y2018/V26/I2/149

Figures/Tables 8

References 32

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模型 Model	拟合方程 Function	决定系数R²Coefficients of determination	Sig.	平均误差系数 Mean error coefficients
线性 Linear	Y = 376.571X - 17.075	0.606	< 0.001	33.4%
二次 Quadratic	Y = 163.385X² + 280.199X - 6.634	0.609	< 0.001	43.0%
乘幂 Power	Y = 383.897X^1.3	0.675	< 0.001	24.3%
指数 Exponential	Y = 11.977e^5.653^X	0.611	< 0.001	32.4%

模型 Model	拟合方程 Function	决定系数R²Coefficients of determination	Sig.	平均误差系数 Mean error coefficients
线性 Linear	Y = 376.571X - 17.075	0.606	< 0.001	33.4%
二次 Quadratic	Y = 163.385X² + 280.199X - 6.634	0.609	< 0.001	43.0%
乘幂 Power	Y = 383.897X^1.3	0.675	< 0.001	24.3%
指数 Exponential	Y = 11.977e^5.653^X	0.611	< 0.001	32.4%

匹配前后 Before & after matching (BM & AM)	统计值 Statistics	海拔 Elevation (m)	坡度 Slope (°)	草地类型(高寒草甸/高寒草原) Grassland type (Alpine meadow/ Alpine steppe)	人口密度(人/km²) Population density (per km²)
匹配前 BM	均值 Mean (内/外 Inside/Outside)	4,567.200 /4,414.500	10.911/12.770	1.129/1.092	0.799/2.782
匹配后 AM	均值 Mean (内/外 Inside/Outside)	4,566.700 /4,572.500	10.914/11.085	1.129/1.120	0.799/1.752
匹配前 BM	标准化均数差 Standardized mean difference	49.409	-19.899	11.040	-9.659
匹配后 AM	标准化均数差 Standardized mean difference	-1.894	-1.833	2.453	-4.639

匹配前后 Before & after matching (BM & AM)	统计值 Statistics	海拔 Elevation (m)	坡度 Slope (°)	草地类型(高寒草甸/高寒草原) Grassland type (Alpine meadow/ Alpine steppe)	人口密度(人/km²) Population density (per km²)
匹配前 BM	均值 Mean (内/外 Inside/Outside)	4,567.200 /4,414.500	10.911/12.770	1.129/1.092	0.799/2.782
匹配后 AM	均值 Mean (内/外 Inside/Outside)	4,566.700 /4,572.500	10.914/11.085	1.129/1.120	0.799/1.752
匹配前 BM	标准化均数差 Standardized mean difference	49.409	-19.899	11.040	-9.659
匹配后 AM	标准化均数差 Standardized mean difference	-1.894	-1.833	2.453	-4.639

序号 No.	评估对象(处理组/对照组) Items（treatment /control）	ATT	t	P-value
1	保护区内/外 Inside/outside of NR	-158.170	-4.7394	0.000^**
2	保护区内/外(去除10 km 缓冲区) Inside/outside (without 10 km buffer) of NR	-126.700	-3.030	0.002^**
3	保护区内/外5 km缓冲区 5 km buffer inside and outside the border of NR	-211.200	-5.755	0.000^**
4	保护区核心区 Core areas of NR	-185.410	-5.668	0.000^**