2000—2018年古尔班通古特沙漠EVI时空变化特征

摘要/Abstract

摘要： 基于MODIS-EVI数据，采用一元线性回归、经验正交函数（EOF）、变异系数，从时间和空间两个维度分析古尔班通古特沙漠增强型植被指数（EVI）的时空变化特征。结果表明：2000—2018年古尔班通古特沙漠整体EVI的年际变化呈显著增加趋势，增长速率为0.016 0·(10a)^-1（P<0.01），其中固定沙丘、半固定沙丘和流动沙丘中的EVI年际变化也呈显著增加趋势；生长季内沙漠整体及不同类型EVI的变化趋势大致相同，从3月开始，EVI逐渐增加，并在6—7月达到一年中的最高值；古尔班通古特沙漠大部分区域的EVI呈上升趋势，上升趋势明显的区域主要集中在沙漠南缘以及沙漠西缘的开荒区域，沙漠腹地EVI上升趋势较小，EVI降低的区域主要分布在沙漠北部；古尔班通古特沙漠EVI波动较大的区域在沙漠西缘与南缘，其中波动最大的区域在沙漠西缘的开荒区域，沙漠腹地EVI波动较小。EVI能够较好地反映以固定和半固定为主的沙漠区植被覆盖变化，其反映的植被状况对区域沙漠地貌类型的空间划分具有重要的参考意义。

关键词: 增强型植被指数（EVI）, 时空变化, 经验正交函数（EOF）, 古尔班通古特沙漠

Abstract: Based on the MODIS EVI data, the spatiotemporal change of EVI in the Gurbantunggut Desert was studied using the one-dimensional linear regression analysis, empirical orthogonal function (EOF) and variable coefficient. The results showed that the interannual variation of EVI in the Gurbantunggut Desert from 2000 to 2018 was in a significant increase trend with an increase rate of 0.016 0·(10a)^-1 (P<0.01), and it on fixed dunes, semi-fixed dunes and mobile dunes was also in a significant increase trend. The variation trend of EVI in the whole desert and different types of the deserts was similar in growth season. From March, EVI increased gradually and reached the highest value during the period from June to July. The EVI was in an increase in most areas of the Gurbantunggut Desert, especially in the southern and western marginal zones, the increase trend was low in the hinterland of the desert, and the areas with a decrease of EVI were mainly distributed in the northern part of the desert. The areas with high EVI fluctuation were mainly distributed in the southern and western marginal zones of the Gurbantunggut Desert, the fluctuation of EVI was the most significant in the western marginal zone, and it was low in the hinterland. EVI can used to reflect the change of vegetation coverage in the desert with fixed and semi-fixed dunes, and these results have important reference significance for spatial division of regional desert types.

Key words: EVI')">

EVI, spatiotemporal change, empirical orthogonal function (EOF), Gurbantunggut Desert

杨怡, 吴世新, 庄庆威, 牛雅萱. 2000—2018年古尔班通古特沙漠EVI时空变化特征[J]. 干旱区研究, 2019, 36(6): 1512-1520.

YANG Yi, WU Shi-xin, ZHUANG Qing-wei, NIU Ya-xuan. Spatiotemporal Change of EVI in the Gurbantunggut Desert from 2000 to 2018[J]. Arid Zone Research, 2019, 36(6): 1512-1520.

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