2021年11月28日 星期日
新疆博尔塔拉-精河流域植被净初级生产力 变化及其与主要气候因子的关系
Variation of vegetation net primary productivity in Bortala-Jinghe River Basin of Xinjiang and its relationship with main climatic factors
2019年 第28卷 第1期 页码[79-84]    下载全文[1.4MB]  
摘要

为揭示新疆博尔塔拉-精河流域植被净初级生产力(NPP)的变化特征及其对气候变化的响应,基于MOD17A3遥感数据对2000年至2015年该地区植被NPP值的时空变化进行了分析,并对植被NPP值与主要气候因子(年均温和年均降水量)的相关性进行了分析。结果表明:在2000年至2015年,林地、耕地、灌木地和草地4种地表覆盖类型植被NPP值的平均值分别为321.1、254.1、190.3和131.7 g·m-2,整个研究区植被NPP值的平均值为0.0~393.7 g·m-2,其空间分布呈现中间高、四周低的特征;57.22%区域的植被NPP值增加,19.90%区域的植被NPP值减少,22.88%区域的植被NPP值保持不变。相关性分析结果表明:53.45%区域的植被NPP值与年均温呈负相关,23.67%区域的植被NPP值与年均温呈正相关;41.65%区域的植被NPP值与年均降水量呈正相关,35.47%区域的植被NPP值与年均降水量呈负相关。值得注意的是,9.95%区域的植被NPP值与年均降水量呈显著正相关,且这些区域均为博尔塔拉河上游和中游两侧山地的草地。研究结果显示:在2000年至2015年,新疆博尔塔拉-精河流域的植被NPP值总体呈上升趋势;年均温和年均降水量对该区域植被生长有一定影响,并且年均降水量对博尔塔拉河上游和中游两侧山地的草地植被NPP值的影响最显著。

Abstract

 In order to reveal variation characteristics of vegetation net primary productivity (NPP) in Bortala-Jinghe River Basin of Xinjiang and its response to climate change, temporal and spatial variations of vegetation NPP value in this area from 2000 to 2015 were analyzed based on MOD17A3 remote sensing data, and the correlation between vegetation NPP value and main climatic factors of annual mean temperature and annual mean precipitation was analyzed. The results show that from 2000 to 2015, the means of vegetation NPP values of four kinds of land cover types of forest land, cultivated land, shrub land, and grassland are 321.1, 254.1, 190.3, and 131.7 g·m-2, respectively, while the mean of vegetation NPP value of the whole research area is 0.0-393.7 g·m-2, and its spatial distribution shows a pattern of high in center and low in around; vegetation NPP value of 57.22% of the area increases, that of 19.90% of the area decreases, while that of 22.88% of the area remains unchanged. The correlation analysis result shows that vegetation NPP value of 53.45% of the area shows a negative correlation with annual mean temperature, while that of 23.67% of the area shows a positive correlation with annual mean temperature; vegetation NPP value of 41.65% of the area shows a positive correlation with annual mean precipitation, while that of 35.47% of the area shows a negative correlation with annual mean precipitation. Notably, vegetation NPP value of 9.95% of the area shows a significantly positive correlation with annual mean precipitation, and these areas are all grasslands in mountainous area on both sides of the upper and middle stream of Bortala River. It is suggested that from 2000 to 2015, vegetation NPP value in Bortala-Jinghe River Basin of Xinjiang shows a tendency to increase in total; annual mean temperature and annual mean precipitation have a certain effect on growth of vegetation in this area, and annual mean precipitation has the most significant effect on vegetation NPP value of grasslands in mountainous area on both sides of the upper and middle streams of Bortala River.

关键词净初级生产力(NPP); 博尔塔拉-精河流域; 时空变化; 年均温; 年均降水量; 相关性分析
Key wordsnet primary productivity (NPP); Bortala-Jinghe River Basin; temporal and spatial variations; annual mean temperature; annual mean precipitation; correlation analysis
作者赵鹏1a,2, 于瑞德1a, 陈桃1b,2, 郭艳飞1a,2, 吴燕良1a,2
所在单位1. 中国科学院新疆生态与地理研究所: a. 干旱区环境演变实验室, b. 荒漠与绿洲国家重点实验室, 新疆 乌鲁木齐 830011;
2. 中国科学院大学, 北京 100049
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基金项目新疆维吾尔自治区重点研发计划项目专项经费(2016B02017-4)