摘要
地表温度和地表植被参数的互动作用将关系到草原区域的稳定性.根据植物温度和环境温度的数据,采用统计学方法,研究地表温度与植被覆盖度、植物种温度、植物群落温度之间的相关性.结果表明:(1) 40%覆盖度下的地表温度最高,小于40%覆盖度时,地表温度随植被覆盖度的增大而增大,覆盖度大于40%时,地表温度随覆盖度的增加而减小;(2)羊草、银灰旋花、糙隐子草、黄囊苔草的温度与地表温度均呈显著正相关;(3)聚类分析中,以多年生旱生/中旱生植物为主的第三类植物生态类群温度(羊草、大针茅等)与地表温度显著正相关;(4)地表温度及0 m和0.1 m处植物群落温度显著正相关,与植物群落温度的拟合系数随着距地高度增加明显降低.植物可吸收大部分的太阳辐射,减缓进入土层的热量;同时又能降低近地表风速,减少表土层水分蒸发及向大气放热的强度,植被不仅通过遮荫土壤表面,对地表起保温作用,而且通过蒸发使地表变得干燥,降低土壤热容量.
The interaction between temperature of land surface and vegetation parameters greatly influences the stability of ecosystem in grassland areas.The data of plant and ambient temperature were obtained in 2016 to study the correlation between temperature of land surface and coverage of vegetation,temperature of plant species and temperature of plant community by using correlation analysis,cluster analysis and other statistical methods in this paper.The results showed that:①The temperature of land surface rose and reached the highest with the coverage of vegetation increasing to 40%,but the trend reversed when the coverage was more than 40%.②There was a significant positive correlation(P<0.05)between the temperature of land surface and temperature of the following plant species:Leymus chinensis,Convolvulus ammannii,Cleistogenes squarrosa,Carex korshinskyi.③Cluster analysis demonstrated that the temperature of some species of the third type of plant ecological group(Leymus chinensis,Stipa grandis etc),which mainly were perennial xerophytes and mesoxerophytes,was significantly positively correlated with temperature of land surface.④The temperature of land surface was significantly positively correlated with the temperature of plant community at 0 m and 0.1 m,but the fitting coefficient decreased significantly with the increasing of height to land surface of plant community.All of the results suggested that the plants were able to absorb most of the solar radiation and reduced the heat entering the soil layer.Also,plants were able to decelerate the wind near surface and thereby reduce the evaporation of top soil and the intensity of heat releasing to the atmosphere.The research indicated that vegetation not only preserved heat by shading the surface of the soil,but also avoided it too wet through transpiration and reduced the heat capacity of the soil.
作者
吴佳佳
李素英
杨理
周舆
杨秀影
WU Jia-jia;LI Su-ying;YANG Li;ZHOU Yu;YANG Xiu-ying(Department of Environment Science and Engineering,Inner Mongolia University of Technology,Hohhot 010051,China;School of Economics and Management,Inner Mongolia University,Hohhot,010021)
出处
《内蒙古师范大学学报（自然科学汉文版）》
CAS
2019年第3期263-267,共5页
Journal of Inner Mongolia Normal University(Natural Science Edition)
基金
国家重点研发计划资助项目(2016YFC0500508)
内蒙古自然科学基金资助项目(2016MS0307)
内蒙古人才开发基金资助项目
关键词
地表温度
植被覆盖度
聚类分析
植物群落
temperature of land surface
vegetation coverage
cluster analysis
plant community
