Journal of Resources and Ecology >
Spatio-temporal Variation of Vegetation Ecological Quality and Its Response to Climate Change in Rocky Desertification Areas in Southwest China during 2000-2020
XU Lingling, E-mail: xulingling2001@126.com |
Received date: 2021-07-21
Accepted date: 2021-10-11
Online published: 2022-01-08
Supported by
The National Natural Science Foundation of China(31700421)
Vegetation restoration is the primary task of ecological reconstruction and rocky desertification control in Karst areas. With vegetation net primary productivity and coverage as two key indicators, a vegetation ecological quality evaluation model was built based on meteorological and remote sensing data. Spatiotemporal variation of vegetation ecological quality index and its response to climate change in rocky desertification areas in Southwest China during 2000-2020 were also analyzed by using the difference method and linear trend method. The results showed that: (1) Vegetation ecological quality in rocky desertification areas in Southwest China showed a fluctuating upward trend during 2000-2020. In 2020, the vegetation ecological quality index reached 69.7, which was 19.9% and 9.3% higher than the averaged values for 2000 and 2000-2019, respectively, ranking the fourth highest since 2000. (2) Vegetation ecological quality of the rocky desertification areas in Yunnan, Guangxi and Guizhou provinces have been improved by 89.2%, 99.2% and 98.5%, respectively, from 2000 to 2020, with their vegetation ecological quality index values increasing by 0.5-0.75 per year in southeast Yunnan, most areas in Guizhou and northwest Guangxi. (3) Precipitation was an important meteorological factor affecting the vegetation ecological quality in rocky desertification areas. The vegetation ecological quality index in the northwest and central Yunnan rocky desertification areas has been rising slowly, but with localized declines at a yearly rate of nearly 0.25 caused by climatic warming and drying.
XU Lingling , QIAN Shuan , ZHAO Xiulan , YAN Hao . Spatio-temporal Variation of Vegetation Ecological Quality and Its Response to Climate Change in Rocky Desertification Areas in Southwest China during 2000-2020[J]. Journal of Resources and Ecology, 2022 , 13(1) : 27 -33 . DOI: 10.5814/j.issn.1674-764x.2022.01.003
Fig. 1 Comparison of vegetation ecological quality index in 2020 with those of perennial (a) and 2019 (b) in rocky desertification areas of Southwest China |
Fig. 2 Precipitation differences in 2020 compared with 2019 during March to June (a) and in July (b) in rocky desertification areas of Southwest ChinaNote: Positive means precipitation enhancement; negative means precipitation reduction. |
Fig. 3 Changing trend of vegetation ecological quality index in rocky desertification areas of Southwest China during 2000-2020 |
Fig. 4 Spatial distribution of annual average change rate of the vegetation ecological quality index in rocky desertification areas of Southwest China from 2000 to 2020Note: Positive means vegetation ecological quality improved; negative means vegetation ecological quality worsened. |
Fig. 5 Spatial distribution of annual average temperature and precipitation averaged changing rate in rocky desertification areas of Southwest China from 2000 to 2020.Note: Positive means temperature or precipitation in increasing tendency; negative means temperature or precipitation in decreasing tendency. |
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