乌珠穆沁草原水热动态对植被的影响
发布时间：2018-08-05 13:54
【摘要】：在陆地生态系统中,土壤、大气和水分等要素通过植被来连接,热量、水分及其分布格局决定着地球上各区域的植被类型,植被的变化往往会反映气候的变化。研究水热时空分布动态变化及植被的相应变化对揭示植被动态变化与水热条件的相关性,预测研究区的生态环境变化趋势具有十分重要的意义。本文以乌珠穆沁草原作为研究区域,以2000-2013 MODIS植被产品和气象数据为主要数据源,运用时间序列分析法、趋势分析法、相关分析法,结合GIS空间分析,定量分析了近15年乌珠穆沁草原水热时空分布、ET及其植被覆盖的变化特征,主要研究结果如下:1.从水热年际变化来看,研究区降水以95.7mm/10a速率呈显著增加趋势,气温呈以0.497℃/10a线性倾向率减少趋势,ET以线性倾向率为21.7mm/10a呈上升趋势,不及降水的增加速率;乌珠穆沁草原近15年气候变化呈相对湿润化趋势。2.2000-2013年,乌珠穆沁草原生长季4月份降水、气温和蒸散量均呈下降趋势,5-9月份的降水和蒸散量呈增加趋势,5、6月份的气温有下降趋势外,其他月份气温呈下降趋势,其中7月份气温下降趋势最大。3.乌珠穆沁草原生长季植被覆盖度以0.05/10a速率呈增加趋势;其中,4月份植被覆盖呈减少趋势,5-10月份的植被覆盖有增加趋势。4.植被长势主要受降水量的控制,降水量多的年份植被长势也好。3月份NDVI值随气温升高而升高,3月份温度高有助于植被的生长发芽,对植被生长尤为重要;其他时段气温对NDVI值负相关,其中7月份植被生长受气温的负相关性最明显。4-6月植被生长受当月降水量的影响明显,7、8月份NDVI值与6月份降水量呈显著正相关,表明植被生长对降水变化具有一定滞后性,但8月份NDVI与当月降水呈负相关,是由于8月份植被长势达到最大值,过多降水可能导致涝灾而影响植被生长。降水及温度对植被NDVI的作用存在一个阈值,对植被的影响既有促进作用也有减弱作用。
[Abstract]:In terrestrial ecosystem, the elements of soil, atmosphere and water are connected by vegetation. The distribution pattern of heat, water and water determines the vegetation types in every region of the earth, and the change of vegetation often reflects the change of climate. It is very important to study the temporal and spatial distribution of water and heat and the corresponding changes of vegetation in order to reveal the correlation between the dynamic changes of vegetation and the conditions of water and heat, and to predict the trend of ecological environment change in the study area. This paper takes Wuzhoumuqin grassland as the research area, taking the vegetation products and meteorological data of MODIS from 2000 to 2013 as the main data sources, using time series analysis, trend analysis, correlation analysis and GIS spatial analysis. The variation characteristics of et and its vegetation cover in Wudhumuqin grassland in recent 15 years were analyzed quantitatively. The main results are as follows: 1. From the point of view of the interannual variation of water and heat, the precipitation in the study area showed a significant increase trend at the rate of 95.7mm/10a, and the temperature showed a decreasing trend with the linear tendency rate of 0.497 鈩，
本文编号：2165996
[Abstract]:In terrestrial ecosystem, the elements of soil, atmosphere and water are connected by vegetation. The distribution pattern of heat, water and water determines the vegetation types in every region of the earth, and the change of vegetation often reflects the change of climate. It is very important to study the temporal and spatial distribution of water and heat and the corresponding changes of vegetation in order to reveal the correlation between the dynamic changes of vegetation and the conditions of water and heat, and to predict the trend of ecological environment change in the study area. This paper takes Wuzhoumuqin grassland as the research area, taking the vegetation products and meteorological data of MODIS from 2000 to 2013 as the main data sources, using time series analysis, trend analysis, correlation analysis and GIS spatial analysis. The variation characteristics of et and its vegetation cover in Wudhumuqin grassland in recent 15 years were analyzed quantitatively. The main results are as follows: 1. From the point of view of the interannual variation of water and heat, the precipitation in the study area showed a significant increase trend at the rate of 95.7mm/10a, and the temperature showed a decreasing trend with the linear tendency rate of 0.497 鈩，
本文编号：2165996
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