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利用定位研究方法对2种乡土防沙灌木下土壤水分时空动态规律进行了研究。结果发现沙拐枣和花棒根系发达,对表土及树冠外土壤水分利用更多;降雨对土壤水分的补充决定于固沙植物的根型和耗水特征。花棒根系为水平分布型,表土耗水剧烈,降雨仅入渗到30cm;而沙拐枣水平和垂直根系均发达,对深层土壤水分利用到50cm土层。根据防沙灌木的根系生长分布特点可确定该地区不同灌木下土壤水分空间分布状况,尤其不同季节不同灌木类型对土壤水分影响更为明显。
The spatial and temporal dynamics of soil moisture under two native desertification shrubs were studied by using the method of location study. The results showed that the stems of Calligonum brasiliensis and Hedysarum scoparium developed well, and had more soil water utilization on topsoil and canopy. The supplement of rainfall to soil moisture was determined by the root type and water consumption characteristics of sandy plants. The roots of Hualien bud were distributed in horizontal distribution. The topsoil consumed water drastically, and the rainfall only infiltrated to 30 cm. The horizontal and vertical root systems of A. fulva were all developed, and the deep soil water was utilized to 50 cm soil layer. According to the characteristics of root growth distribution of sand-control shrubs, the spatial distribution of soil moisture under different shrubs in the region can be determined. In particular, the impact of different shrub types on soil moisture is more obvious in different seasons.