| 榆林地区植被指数动态变化及其对气候和人类活动的响应 |
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| 引用本文： | 王涛,杨梅焕.榆林地区植被指数动态变化及其对气候和人类活动的响应[J].干旱区研究,2017,34(5). |
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| 作者姓名： | 王涛 杨梅焕 |
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| 作者单位： | 1. 西安科技大学测绘科学与技术学院,陕西西安710054;黄土高原土壤侵蚀与旱地农业国家重点实验室,中国科学院水利部水土保持研究所,陕西杨凌712100;西北大学城市与环境学院,陕西西安710127;2. 西安科技大学测绘科学与技术学院,陕西西安,710054 |
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| 基金项目： | 国家自然科学基金项目，陕西省自然科学基础研究计划，黄土高原土壤侵蚀与旱地农业国家重点实验室开放基金项目 |
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| 摘 要： | 榆林地区是中国典型生态脆弱区,植被生态系统对气候变化和人类活动影响较为敏感。以榆林地区2000—2015年MODIS NDVI为基础,结合气温、降水数据,利用线性趋势法、相关系数、偏相关系数及缓冲区方法,分析了区域NDVI(归一化差异植被指数)动态变化及其对气候和人类活动的响应,结果表明:(1)榆林地区总体上NDVI较小,植被覆盖水平较低。2000—2015年NDVI以每年0.009 6的线性速率递增,空间上主要表现出线性增加趋势,占总面积的97.06%,减少趋势面积较小且主要与人类活动有关,分布在区域西南部山区、城镇附近及中、东部的河流谷地。(2)相关分析表明,榆林地区NDVI与气温以负相关为主,而与降水以正相关为主,反映出干旱、半干旱地区水分是植物生长的主导因子。(3)NDVI变化过程反映出人类活动范围中,市级行政中心缓冲区人类活动强度高于县级行政中心缓冲区。市级行政中心缓冲区范围可划分为5 km以内受人类活动剧烈影响区域、5~9km受人类活动影响递减区域和9 km以外未受人类活动影响区域。
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| 关 键 词： | NDVI 气温 降水 人类活动 榆林 |
Dynamic Change of NDVI and Its Response to Climate Change and Human Activities in Yulin,Shaanxi Province,China |
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| WANG Tao,YANG Mei-huan.Dynamic Change of NDVI and Its Response to Climate Change and Human Activities in Yulin,Shaanxi Province,China[J].Arid Zone Research,2017,34(5). |
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| Authors: | WANG Tao YANG Mei-huan |
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| Abstract: | Yulin is a typical ecologically fragile area in China,and its vegetation ecosystem is so fragile that could be vulnerable to climate change and human activities.In this study,the linear trend analysis,correlation and buffer analysis were used to analyze the spatial and temporal change of Normalized Difference Vegetation Index (NDVI) and its relationship with climate change and human activities based on MODIS NDVI data from 2000 to 2015 and annual temperature and precipitation data from 2000 to 2014.Result are as follows:① NDVI values and vegetation coverage in Yulin were low,and NDVI had a linear annual growth rate of 0.009 6 from 2000 to 2015.The proportion of areas with growth trend accounted for 97.06％ of the total area,but the area with decrease trend was small,which was mainly related to human activities and distributed in the southwest mountainous area,urban neighborhood and river valleys in central and eastern Yulin;② NDVI had mainly a negative correlation with temperature,but mainly a positive one with precipitation,which revealed that rainfall is the main factor affecting vegetation growth;③ NDVI change process indicated that the intensity of human activities in city-level buffer was higher than that in county-level buffer.Human activities in city-level buffer affected strongly the area within 5 km,they were decreased in the area from 5 km to 9 km,and there were no effects of human activities in the area further than 9 km. |
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| Keywords: | NDVI temperature precipitation human activity Yulin |
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