Spatiotemporal Variations of NDVI in Ningxia Hui Autonomous Region

Du Ling-tong; Tian Qing-Jiu

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Spatiotemporal Variations of NDVI in Ningxia Hui Autonomous Region

- Spatiotemporal Variations of NDVI in Ningxia Hui Autonomous Region
- Bulletin of Soiland Water Conservation Vol. 30, Issue 5, Pages: 208-214(2011)
- 作者机构：
  
  1. 南京大学国际地球系统科学研究所
  2. 宁夏大学西北退化生态系统恢复与重建教育部重点实验室
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published：2011
- 稿件说明：
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Du Ling-tong, Tian Qing-Jiu. Spatiotemporal Variations of NDVI in Ningxia Hui Autonomous Region[J]. Bulletin of Soiland Water Conservation, 2011, 30(5): 208-214.
DOI：

Du Ling-tong, Tian Qing-Jiu. Spatiotemporal Variations of NDVI in Ningxia Hui Autonomous Region[J]. Bulletin of Soiland Water Conservation, 2011, 30(5): 208-214. DOI：

摘要

利用1999年以来的SPOT-VGTNDVI及气象数据

在合成月、年最大值NDVI及标准化植被异常指数等指标的基础上

运用回归分析、相关分析和变异系数等NDVI时空分析方法

对宁夏回族自治区近11a来的植被活动特征进行了研究。结果表明

在空间分布上

NDVI存在南北好

中部差的特征

这与宁夏植被分布格局和地理气候特点相吻合;在年际变化上

NDVI值受降雨影响较大

特别是中部干旱带的NDVI对干旱胁迫响应明显;在变化趋势上

该区大部分地区的NDVI值处于逐渐增加的态势

只有5个地级市所在的少部分地区

其NDVI处于降低趋势。NDVI的时空变化特征表明

该区近年来的生态环境在逐步改善

且NDVI变化对区域生态系统变动响应明显。近年来

该区实施的许多重大生态治理工程是导致区域NDVI增强的主要因素。

Abstract

Based on SPOT-VGT NDVI and meteorological data from 1999to 2009

the paper synthesized monthly and yearly maximum NDVI

and standardized anomaly NDVI.Using some spatiotemporal analysis methods

such as regression analysis

correlation analysis and variation coefficient

the paper studied the dynamic characteristics of vegetation in Ningxia Hui Autonomous Region over recent 11years.The spatial distribution analysis results show that the NDVI values were higher in the north and the south part

but lower in middle.This characteristic agreed with the geographical division and vegetation distribution pattern of Ningxia.The NDVI values changed greatly over time and responded closely to yearly precipitation

especially in the drought zone located in the middle of the region.The NDVI in most places within the region increased during the period and in only five areas decreases of NDVI were found

which indicated the whole vegetation cover the region became better over the period.The spatiotemporal variations of NDVI show that the ecosystem has been gradually improved in recent years as the NDVI variations responded clearly to the ecosystem changes.There had some ecological restorations projects applied recently

which might be the major factor that resulted in the increase of NDVI in the region

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