湖北农业科学 ›› 2024, Vol. 63 ›› Issue (5): 22-29.doi: 10.14088/j.cnki.issn0439-8114.2024.05.005

• 资源·环境 • 上一篇    下一篇

2000—2021年渭河流域NDVI变化及其影响因素

封建民1, 刘宇峰1, 郭玲霞1, 文琦2   

  1. 1.咸阳师范学院地理与环境学院,陕西 咸阳 712000;
    2.宁夏大学建筑学院,银川 750021
  • 收稿日期:2023-04-27 出版日期:2024-05-25 发布日期:2024-06-04
  • 作者简介:封建民(1972-),男,陕西凤翔人,教授,博士,主要从事遥感应用研究,(电话)13571062160(电子信箱)feng_jianmin@aliyun.com。
  • 基金资助:
    国家自然科学基金项目(42061037); 陕西省创新能力支撑计划项目(2023-CX-RKX-063); 陕西省高等教育改革研究项目(23BY146)

Change and the influencing factors of NDVI in Weihe River Basin from 2000 to 2021

FENG Jian-min1, LIU Yu-feng1, GUO Ling-xia1, WEN Qi2   

  1. 1. School of Geography and Environment, Xianyang Normal University, Xianyang 712000, Shaanxi, China;
    2. School of Architecture, Ningxia University, Yinchuan 750021, China
  • Received:2023-04-27 Published:2024-05-25 Online:2024-06-04

摘要: 渭河流域是黄河中游重要的生态涵养地,同时也是黄土高原水土流失的典型区域,监测该地区植被生长变化趋势,并分析其与气候变化和人类活动的关系,对科学评估区域生态建设成效、黄土高原植被恢复和生态修复具有重要意义。基于2000—2021年归一化植被指数(NDVI)、气温、降水量、人口密度、土地利用数据,分析了渭河流域NDVI的时空变化特征,探究了气候变化和人类活动对NDVI变化趋势的影响。结果表明,2000—2021年,渭河流域植被生长季NDVI呈增加趋势,全区年平均增速为0.004。年际尺度上,NDVI与年平均降水量呈正相关关系,与年平均气温的相关性不显著;月尺度上,NDVI与 4月和8月的气温、降水量均呈正相关关系,与7月气温呈弱的负相关关系。人口密度变化与NDVI变化趋势呈负相关,流域人口密度的减小有利于植被的恢复和改善。土地利用类型内部变化是植被NDVI变化的主要原因。NDVI显著减少区NDVI的减少趋势主要由关中平原耕地NDVI的减少引起,NDVI显著增加区NDVI的增加趋势主要由草地、林地以及黄土丘陵区、黄土残塬区耕地NDVI的增加引起。

关键词: 归一化植被指数(NDVI), 气候, 人口密度, 土地利用, 渭河流域

Abstract: The Weihe River Basin is an important ecological conservation area in the middle reaches of the Yellow River. It is also a typical region of soil erosion on the Loess Plateau. Monitoring the trend of vegetation growth in the region and analyzing its relationship with climate change and human activities are important for the scientific assessment of regional ecological construction, vegetation and ecological restoration of the Loess Plateau. The normalized difference vegetation index(NDVI), temperature, precipitation, population density, and land use data from 2000 to 2021 were selected to analyze the spatio-temporal variation characteristics of NDVI in Weihe River Basin, and explore the impacts of climate change and human activities on the trends of NDVI. The results showed that, from 2000 to 2021, NDVI increased in the Weihe River Basin, with an annual average growth rate of 0.004. On the inter-annual scale, NDVI was a positively correlated with annual average precipitation, but not significantly correlated with annual average temperature. On the monthly scale, NDVI had a positive correlation with temperature and precipitation in April and August, and a weak negative correlation with the temperature in July. The change of population density was negatively correlated with the change of NDVI, which indicated that the decrease of population density was beneficial to the restoration and improvement of vegetation. The internal change of land use type was the main reason for the vegetation NDVI change. The decreasing trend of NDVI in the area with significant decrease of NDVI was mainly caused by the decreasing of NDVI of cultivated land in Guanzhong Plain, while the increasing trend of NDVI in the area with significant increase of NDVI mainly resulted from the increase of NDVI in grassland, forest land, and cultivated land in the loess hilly area and loess remnant plateau.

Key words: normalized difference vegetation index (NDVI), climate, population density, land use, Weihe River Basin

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