本文選題：植被變化 + NDVI�。� 參考：《干旱區(qū)地理》2016年02期

【摘要】：基于重構后的AVHRR GIMMS NDVI、MODIS NDVI、GLC 2000數(shù)據(jù)產(chǎn)品和研究區(qū)的128個氣象站點的氣溫、降水數(shù)據(jù),利用回歸分析、相關性分析法,研究了西北地區(qū)近30 a(1984-2013年)以來不同植被NDVI的時空變化及其與氣候的相關性。結果表明:(1)研究時段內(nèi),西北地區(qū)植被NDVI變化整體上呈上升趨勢,將整個研究分為兩個時段,1984-1997年呈小幅上升趨勢,且波動起伏較大,最大值在1993年,最小值出現(xiàn)在1995年;1997-2013年也呈波動上升趨勢,且上升趨勢大于前一階段。(2)空間上,西北地區(qū)植被NDVI變化存在明顯的區(qū)域差異,大部分區(qū)域植被NDVI變化顯著性較弱,昆侖山、塔里木盆地北部、祁連山、青海的中東西部、甘肅東部、陜西北部等地區(qū)植被NDVI顯著增加;阿爾泰山、天山、伊犁哈薩克自治州等干旱地區(qū)植被NDVI下降趨勢明顯。(3)除甘肅的祁連山、青海東南部、陜西的秦嶺等地植被NDVI的變化主要受氣溫的驅動外,西北地區(qū)植被NDVI變化與氣溫整體上呈弱相關,干旱半干旱地區(qū)植被與氣溫呈負相關;除甘肅南部、祁連山西段和陜西中部等一些年降水量較多以及灌溉農(nóng)業(yè)區(qū)或草地以外,西北地區(qū)植被與降水呈較強正相關,降水是影響植被變化的主要自然因素;(4)不同植被類型NDVI的變化具有時空差異性,且與氣溫和降水的相關性不盡相同,與氣溫由強到弱:耕地灌叢草地沼澤濕地林地;與降水由強到弱:耕地草地灌叢林地沼澤濕地。
[Abstract]:Based on the reconstructed AVHRR GIMMS NDVI MODIS NDVI 2000 data product and the temperature and precipitation data from 128 meteorological stations in the study area, regression analysis and correlation analysis are used.The temporal and spatial variations of NDVI in different vegetation and its correlation with climate in Northwest China from 1984 to 2013 were studied.The results showed that the NDVI variation of vegetation in Northwest China showed an upward trend during the period of study. The whole study was divided into two periods: 1984-1997 with a small upward trend, and the fluctuation was quite large. The maximum value was in 1993.The minimum value also showed a fluctuating upward trend from 19951997 to 2013, and the rising trend was larger than that of the former stage. There were obvious regional differences in vegetation NDVI changes in Northwest China, and the significant changes of vegetation NDVI were weak in most regions and Kunlun Mountains.In the northern part of the Tarim Basin, Qilian Mountains, the central and western parts of Qinghai, the eastern part of Gansu, and the northern part of Shaanxi, the vegetation NDVI increased significantly; the Altai Mountains, the Tianshan Mountains, the Tianshan Mountains, and so on.Except for the Qilian Mountains in Gansu Province, the southeast of Qinghai and the Qinling Mountains in Shaanxi Province, the change of vegetation NDVI is mainly driven by temperature.The variation of vegetation NDVI was weakly correlated with air temperature in Northwest China, and negatively correlated with temperature in arid and semi-arid areas, except for some annual precipitation in southern Gansu, western Qilian Mountains and central Shaanxi, and irrigated agricultural areas or grasslands.There is a strong positive correlation between vegetation and precipitation in Northwest China. Precipitation is the main natural factor affecting vegetation change. (4) the variation of NDVI of different vegetation types has space-time difference, and the correlation with temperature and precipitation is not the same.And temperature from strong to weak: cultivated land, shrub, grassland, marsh wetland, and precipitation from strong to weak: cultivated land, grassland, shrub, woodland, marsh wetland.
【作者單位】： 西北師范大學地理與環(huán)境科學學院;蘭州大學資環(huán)學院;
【基金】：甘肅省科技計劃(1308RJZA141) 國家自然科學基金(41261016)資助
【分類號】：Q948;P237

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本文編號：1743196