Effects of vegetation height and density on soil temperature variations  

作　　者：SONG YanTao ZHOU DaoWei ZHANG HongXiang LI GuangDi JIN YingHua LI Qiang 

机构地区：[1]Institute of Grassland Science, Northeast Normal University [2]Key Laboratory of Vegetation Ecology, Ministry of Education [3]Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences [4]Graham Centre for Agricultural Innovation (alliance between Industry&Investment NSW and Charles Sturt University), Wagga Wagga Agricultural Institute

出　　处：《Chinese Science Bulletin》2013年第8期907-912,共6页

基　　金：supported by the National Basic Research Program of China(2011CB403200, 2011CB403203)

摘　　要：Reduction in vegetation cover caused by human activities has a great impact on soil temperature. It is important to assess how soil temperature responds to reduction of vegetation height and density. In this paper we first report the trends of mean annual soil surface and air temperatures recorded at the meteorological stations near the Ecological Research Station for Grassland Farming (ERSGF) from 1961 to 2007, then we setup an experiment using reed (Phragmites australis) stalks with different heights and densities to simulate effects of different vegetation height and density on soil and air temperatures. The warming rates of the mean annual soil and air temperatures were 0.043 and 0.041C a 1 , respectively. Changes of soil temperature were characterized by both increased mean annual maximum and minimum soil temperatures. At the experimental site, mean daily temperature, mean daily maximum soil and air temperatures increased significantly. In contrast, mean daily minimum soil temperature increased significantly while mean daily minimum air temperature decreased significantly as the height and density of reed stalks reduced during the experimental period. Mean diurnal soil temperature ranges were smaller than mean diurnal air temperature ranges. These results highlight that the importance of vegetation cover on soil and air temperatures.Reduction in vegetation cover caused by human activities has a great impact on soil temperature. It is important to assess how soil temperature responds to reduction of vegetation height and density. In this paper we first report the trends of mean annual soil surface and air temperatures recorded at the meteorological stations near the Ecological Research Station for Grassland Farming （ERSGF） from 1961 to 2007, then we setup an experiment using reed （Phragmites australis） stalks with different heights and densities to simulate effects of different vegetation height and density on soil and air temperatures. The warming rates of the mean annual soil and air temperatures were 0.043 and 0.041℃ a-1, respectively. Changes of soil temperature were characterized by both increased mean annual maximum and minimum soil temperatures. At the experimental site, mean daily temperature, mean daily maximum soil and air temperatures increased significantly. In contrast, mean daily minimum soil temperature increased significantly while mean daily minimum air temperature decreased significantly as the height and density of reed stalks reduced during the experimental period. Mean diurnal soil temperature ranges were smaller than mean diurnal air temperature ranges. These resuits highlight that the importance of vegetation cover on soil and air temperatures.

关 键 词：土壤温度 植被高度 密度 空气温度 气温记录 植被覆盖 实验场地 温度范围 

分 类 号：S154.4[农业科学—土壤学]