Spatiotemporal Tradeoffs and Synergies in Vegetation Vitality and Poverty Transition in Rocky Desertification Area
Abstract
Vegetation recovery and poverty alleviation are critical problems in the karst national designed poor counties
(NPDC) in southwest China. However, little information is available about the relationship between poverty
and vegetation dynamics in these areas. In this study, we used remote sensing and statistical datasets from
2000 to 2015 to identify the relations between vegetation dynamics and poverty among the NPDC in southwest
rocky desertification areas. We estimated the vegetation dynamics using the Normalized Difference Vegetation
Index and poverty with the rural per capita net income. Local indicator of spatial association and the
space-time transition type of poverty were applied to identify spatial patterns of the poverty spatial distribution
relationship and transition. Also, poverty, natural and ecological governance factorswere assessed using the Geodetector
method to uncover the driving factors of karst vegetation. The results showed that vegetation increased
significantly (p < 0.05) in karst NPDC (82.82%) and rocky desertification control counties (78.77%). The karst
NPDC was significantly clustered. The hot spots of rural per capita net income changed from west and north
(2000) to only north (2015) and cold spots changed from east and south (2000) to only south (2015). The
rural per capita net income spatiotemporal transitionwas higher in 2000 than in 2015.Wefound aweak synergy
between vegetation change and poverty type transition in 42.86% of the browning counties, 45.45% in the slowly
greening counties, and 43.65% in stable greening counties. However, 57.50% of counties in the quick greening
counties showed a tradeoff relationship with the poverty type transition. The rocky desertification rate and
ecological engineering measures affected vegetation dynamics importantly. The results will help decisionmakers
to understand the interdependence between vegetation and poverty. This will contribute to better
policies formulation to tackle poverty in the karst rocky desertification area.
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