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莫莫格湿地冷岛效应遥感分析

时间:2022-04-27 19:10:03  浏览次数:

zoޛ)j香۲םjwlj�Kn4&:INm۲ڝv۲۲v饨ky文章编号 0517-6611(2019)23-0082-06

doi:10.3969/j.issn.0517-6611.2019.23.026

开放科学(资源服务)标识码(OSID):

Remote Sensing Analysis of Cold Island Effect in Momoge Wetland

XIANG Xiao yun1, LI Feng xiu2 ,DU Jia3 et al

(1.College of Tourist and Geoscience, Jilin Normal University, Siping,Jilin 136000;2.Henan Meteorological Center,Zhengzhou,Henan 450003;3.Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun, Jilin 130102)

Abstract Based on the Landsat 8 image of the Momoge Wetland in the spring, summer and autumn of 2015, land surface temperature was estimated by using atmospheric correction method. We used buffering analysis, overlay analysis and geostatistical analysis in spatial analysis tools of ArcGIS software to complete the cold island effect study of Momoge Wetland based on the remote sensing inversion results and land use data. The results showed the cold island effect of the wetland on different land use types was gradually weakened when the distance from the wetland increased.Wetland had different cooling effects on different land use types. The impact on residence, dryland and saline alkali land was roughly 240-540 m, 480-660 m and 600-660 m, respectively. Wetland has different cooling effects on other land use types in different seasons. In the three seasons of spring, summer and autumn, the cooling effect from strong to weak is summer, autumn and spring.

Key words Cold island effect;Atmospheric correction method;Landsat 8 image;Momoge Wetland

濕地是位于陆生生态系统和水生生态系统之间的过渡性地带,是水陆相互作用形成的一种独特的生态系统,湿地具有较大的比热容量和较强的水分蒸散度,其自身的“碳汇”作用使其对周边的大气温度和湿度都起到显著的调节作用[1]。由于湿地长期和季节性积水,其水热容量较大,气候较周边区域冷。正是由于这种冷岛作用,所以湿地能够在一定程度上对周边不同土地利用类型具有冷岛效应。

目前关于湿地的冷岛效应国内有很多学者进行了研究,杨一鹏等[2]提出气候调节功能在干旱区的湿地表现尤为显著,每年气候调节所带来的生态服务价值在湿地总生态服务价值中占比可达到32%,居于各项生态价值的首位;聂晓等[3]对沼泽湿地的局地小气候效应进行研究,结果表明,沼泽湿地具有一定的冷湿效应,且在不同高度上冷湿作用表现有所不同,距离地面越近作用越显著;拱秀丽等[4]以洪河自然保护区为研究区,对沼泽湿地冷湿小气候效应的时空分布特征进行模拟研究,发现湿地在垂直方向和水平方向上其冷湿效应的效果存在差异。以往对湿地冷岛效应的研究多关注于湿地具有冷湿作用的功能研究,对于其冷岛效应影响程度和影响范围的研究较少。

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