基于EVI的中國(guó)最近10 a植被覆蓋變化特征分析

doi:10.3969/2015jms.0100

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基于EVI的中國(guó)最近10 a植被覆蓋變化特征分析
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                        10.3969/2015jms.0100
                    
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基金項(xiàng)目:國(guó)家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃（973計(jì)劃）項(xiàng)目（2011CB403202）；國(guó)家自然科學(xué)基金資助項(xiàng)目（40675040）

Variation characteristics of vegetation cover in the latest 10 years over China based on EVI

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摘要:

通過(guò)對(duì)2000-2009年增強(qiáng)型植被指數(shù)（EVI）數(shù)據(jù)的分析發(fā)現(xiàn)：在過(guò)去的10 a里，中國(guó)的植被覆蓋度明顯增加，植被活動(dòng)在增強(qiáng)。植被覆蓋的年變化和季節(jié)變化特征如下：（1）10 a來(lái)植被覆蓋地區(qū)的面積呈增加趨勢(shì)，植被稀少地區(qū)的面積呈減少趨勢(shì)；（2）無(wú)論是植被覆蓋區(qū)還是全國(guó)平均，單位面積EVI年平均值都呈增加趨勢(shì)；（3）在生長(zhǎng)季節(jié)（夏季、春季）植被活動(dòng)增加更明顯，EVI增加速率按季節(jié)排列如下：夏季 > 春季 > 秋季 > 冬季。植被覆蓋的空間變化特征顯示，盡管總體上中國(guó)植被覆蓋呈增加趨勢(shì)，但存在空間異質(zhì)性。結(jié)合同期的溫度、降水和森林資源清查數(shù)據(jù)，從兩個(gè)方面初步解釋了植被覆蓋度增加的原因，即：溫度的上升和春季降水量的增加；近年來(lái)中國(guó)開(kāi)展的大型林業(yè)生態(tài)建設(shè)工程。

Abstract:

Analysis on the variation data of Enhanced Vegetation Index (EVI) from 2000 to 2009 found that the vegetation coverage was obviously increasing and the vegetation activity was enhancing in China during the past ten years. The characteristics of interannual and interseasonal vegetation coverage variation were as follows:(1) the area of vegetation coverage was increasing while the area of bare land was decreasing; (2) the mean EVI per unit land either in vegetation coverage areas or in the average areas of the whole country was increasing in the past ten years; (3) vegetation activity enhanced obviously in growing seasons (summer, spring), and the growth rate of EVI was ordered according to season as summer > spring > autumn > winter. The spatial variation features of vegetation coverage show that although the vegetation coverage presents increasing trend in China, the spatial difference exists. The increasing of EVI around China could be caused because of:(1) the increasing temperature and precipitation in spring; (2) large forestry ecological construction projects.

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赫英明,劉向培,王漢杰.基于EVI的中國(guó)最近10 a植被覆蓋變化特征分析.氣象科學(xué),2017,37(1):51-59 HE Yingming, LIU Xiangpei, WANG Hanjie. Variation characteristics of vegetation cover in the latest 10 years over China based on EVI. Journal of the Meteorological Sciences,2017,37(1):51-59

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收稿日期:2015-06-05
最后修改日期:2015-11-03
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在線發(fā)布日期: 2017-03-07
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