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Variation Characteristics of NDVI of Different Vegetation Types in Ningxia, China and Their Responses to Climate(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2023年第04期
Page:
819-832
Research Field:
环境与可持续发展专刊
Publishing date:

Info

Title:
Variation Characteristics of NDVI of Different Vegetation Types in Ningxia, China and Their Responses to Climate
Author(s):
PAN Jin-jin1;  REN Zong-ping1*;  XU Shi-bin2;  LI Peng1; 3;  ZHANG Xiao-ming4;  XU Yao-tao1;  REN Zheng-yan5
(1. State Key Laboratory of Eco-hydraulics in Northwest Arid Region of China, Xi'an University of Technology, Xi'an 710048, Shaanxi, China; 2. Xiji Indiscriminate Mud River Basin Soil and Water Conservation Test Workstation, Xiji 756200, Ningxia, China; 3. Key Laboratory of National Forestry and Grassland Administration on Ecological Hydrology and Disaster Prevention in Arid Regions, Xi'an University of Technology, Xi'an 710048, Shaanxi, China; 4. China Institute of Water Resources and Hydropower Research, Beijing 100038, China; 5. Ningxia Soil and Water Conservation Monitoring Station, Yinchuan 750002, Ningxia, China)
Keywords:
NDVI;  vegetation type;  spatial-temporal change;  temperature;  rainfall;  variance decomposition;  correlation;  Ningxia
PACS:
Q948.112; X171.1; X87
DOI:
-
Abstract:
It is important to quantitatively analyze the driving mechanisms of vegetation cover changes and explore the relationship between vegetation and climate factors for regional ecological environment evaluation and soil and water conservation. Based on the normalized difference vegetation index(NDVI)in Ningxia from 1998 to 2019, the trend analysis, partial correlation analysis and variance decomposition of RDA were used to investigate the spatial-temporal variation characteristics of NDVI of different vegetation types and their driving factors. The results show that ① the annual growth rate of NDVI is 0.007 1 a-1, with the lowest NDVI growth rate in spring(0.002 3 a-1)and the highest NDVI growth rate in autumn(0.007 5 a-1); the NDVI growth rates of coniferous forests, shrub and desert are the highest in summer, and the NDVI growth rates of broad-leaved forests, farmland, grasslands and meadows are the highest in autumn; ② on the annual scale, 93.4% of the regional NDVI show an improving trend; within different seasons, the vegetation degradation is serious in spring, 16.6% of the vegetation area show a decreasing trend, which mainly occur in the yellow irrigation area of northern Ningxia, and the degraded areas in other seasons are concentrated around Yinchuan city; ③ climate is the main factor affecting the vegetation change, NDVI is positively correlated with temperature throughout the year and in spring, while NDVI and temperature are negatively correlated in summer, and NDVI and precipitation are positively correlated in different seasons.

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Last Update: 2023-06-20