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Spatial heterogeneity of soil water content in the reversion process of desertification in arid areas

Journal of Arid Land 2011年第4期3卷 268-277页

作者： QuanLin MA Fang CHENG YouJun LIU FangLin Wang DeKuai ZHANG HuJia JIN Gansu Key Laboratory of desertification Combating ＆ Minqin National Studies Station for Desert Steppe Ecosystem Gansu Desert Control Research Institute Lanzhou 730070 China Institute of desertification Studies Chinese Academy of Forestry Beijing 100091 China

Sandy soils in arid,rain-fed environments have low and limited water content,which is a principal factor limiting vegetation development,and a key constraint controlling the structure and functions of the ecological systems in arid *** spatial heterogeneity of soil water content is a major soil property,and a focus of soil science and *** the southern edge of the Tengger Desert,sample plots were selected from mobile sand dunes in desertified lands that had been enclosed for 5,15 and 25 years,*** study explored the dynamic and spatial heterogeneity of soil water content in these different layers of soil that were also in the reversion process of *** results showed that the soil water content of the mobile sand dunes was highest when in the initial stages of the reversion process of desertification,while the soil water content in the 0-20 cm,20-40 cm and 40-60 cm layers of soil was 1.769%,3.011%,and 2.967% respectively,presenting a restoring tendency after 25 years of *** were significant differences,as a whole,in the soil water content among different restoration stages and different soil layers,*** in soil water content,in different soil layers,at different restoration stages,exhibited exponential or spherical *** spatial distribution of soil water content exhibited a mosaic patch pattern with obvious spatial *** ratio of the heterogeneity of spatial autocorrelation to gross spatial heterogeneity was greater than 50%.The gross spatial heterogeneity of the 0-20 cm layer of soil improved gradually,while those of the 20-40 cm and 40-60 cm layers improved initially,then weakened in the reversion process of *** study revealed that restoration with sand-binding vegetation reduced soil water content,and increased its spatial heterogeneity in arid ***,after 25 years of vegetation-soil system restoration,the soil water content started to increase and it

关键词： Tengger Desert reversion process of desertification soil water content sand-binding vegetation geostatistical analysis

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