| 祁连山MODIS LST时空变化特征及影响因素分析 |
| |
| 引用本文： | 邱丽莎,何毅,张立峰,王文辉,唐源蔚.祁连山MODIS LST时空变化特征及影响因素分析[J].干旱区地理,2020,43(3):726-737. |
| |
| 作者姓名： | 邱丽莎 何毅 张立峰 王文辉 唐源蔚 |
| |
| 基金项目： | 甘肃省自然科学基金( 17JR5RA095 );兰州交通大学天佑青年托举人才计划;甘肃省教育厅“兰州市主城区地面沉降 InSAR 监测”(2019A-043)资助 |
| |
| 摘 要： | 地表温度(Land Surface Temperature，LST)是研究区域尺度和全球尺度上地表能量和水平衡物理过程中不可缺少的参数。祁连山LST的时空变化规律及其影响因素模式未知。通过采用趋势分析法和相关性分析法，探讨2000—2017年间祁连山LST〖WTBZ〗的时空变化特征及与植被的相互关系，分析各植被类型下地表温度的时空分异特征。结果表明：（1） MODIS LST产品的精度能够满足祁连山地表温度时空变化分析的要求。（2） 祁连山LST时间序列呈
“上升—下降—上升—下降”的波动变化，整体呈小幅上升趋势，以0.17 ℃·（10
a）-1的速率波动上升，冬季LST上升趋势最显著（63.37%），变化率为0.22℃·（10 a）-1；空间上呈西北降低东南升高的变化趋势，显著上升面积（14.89%）远大于下降面积（0.90%）。（3） 祁连山年均LST与NDVI呈负相关，显著相关区域占22.56%，夏季NDVI对LST的调控作用较显著（25.45%）；荒漠NDVI对LST的影响大于其他植被类型。（4） 海拔对各植被类型LST有强烈的影响，相关性依次为荒漠>林地>草甸>耕地；然而，夏季LST与海拔的相关性因植被覆盖增加而显著降低。（5）祁连山LST上升是NDVI、海拔以及植被类型综合影响的结果。
|
| 关 键 词： | MODIS LST NDVI 植被类型 祁连山 |
| 收稿时间： | 2020-01-07 |
Spatiotemporal variation characteristics and influence
factors of MODIS LST in
Qilian Mountains |
| |
| QIU Li-sha,HE Yi,ZHANG Li-feng,WANG Wen-hui,TANG Yuan-wei.Spatiotemporal variation characteristics and influence
factors of MODIS LST in
Qilian Mountains[J].Arid Land Geography,2020,43(3):726-737. |
| |
| Authors: | QIU Li-sha HE Yi ZHANG Li-feng WANG Wen-hui TANG Yuan-wei |
| |
| Abstract: | Land surface temperature (LST) is an important variable in the surface energy
budget,significantly affecting the global agriculture，natural
disasters，hydrology,and ecological environment.With
global climate change,quantitative research on LST and its related factors become critical in both regional and
global scales.The Qilian Mountains in Qinghai and Gansu Province,China,as the
boundary between the Qinghai-Tibetan Plateau and Northern Hinterland,is
influenced by the continental climate and the climate of the Qinghai Tibetan Plateau.It belongs to the temperate semi-arid climate zone
and is an important geographical and climatic boundary line in China.The study
of LST in the Qilian Mountains is
essential for understanding the hydrothermal cycle in the northwest and
improving the fragile ecological environment.The climate pattern,vegetation,and
different land-use of the Qilian Mountains have been studied
comprehensively.However,the spatiotemporal variability characteristics of LST and its response mode to terrain are
not yet clear.Besides,the impact of different vegetation types on LST changes need to be discussed.Based
on the MODIS LST data from 2000 to
2017,this study used a linear trend method to analyze the temporal and spatial
variation of LST in the Qilian
Mountains and used Pearson correlation analysis to discuss the regulation of LST by different types of vegetation and
the influence of altitude on its change.The results are as follows: (1) the
accuracy of MODIS LST products can
meet the requirements of temporal spatial variation
analysis of surface temperature in the Qilian Mountains.(2) LST of the Qilian Mountains increased at
a rate of 0.17 ℃·(10 a)-1，with two rising periods in 2000-2003 (1.83 ℃·(10 a)-1) and 2004-2017 (0.14 ℃·(10
a)-1).The annual average 〖WTBX〗LST〖WTBZ〗 increased
from South West to North East,and
the significant rising area accounts for 77.26% of the total area.The extremely
significant rising areas were mainly distributed in the middle and low
altitudes below 3 500 m.In addition,the winter change rate was the highest
(0.22 ℃·(10 a)-1),and the warmer area
reached 98.23%.The winter warming had the greatest contribution to the increase
of LST in the Qilian Mountains.(3)
vegetation had a significant impact on LST changes,cultivated lands had a better inhibitory effect on LST rise,and vegetation in the desert had a stronger regulatory
effect on LST.Except for summer，the NDVI and LST were positively correlated in the
rest of the season，and the positively correlated areas
were mainly concentrated in the high altitude forest
land.(4) the effect of altitude on LST was significantly weak during the summer due to conditions such as vegetation
cover changes.The LST in the desert
showed the strongest response to altitude,with strong annual fluctuations
between 2 500 and 3 500 m.Meanwhile,vegetation degradation and human activities
at low and medium altitudes may be the main factors accelerating the increase
in LST. |
| |
| Keywords: | |
|
| 点击此处可从《干旱区地理》浏览原始摘要信息 |
| 点击此处可从《干旱区地理》下载免费的PDF全文 |
|
