科尔沁沙地固沙植物根系与土壤水分特征研究

The characteristics of sand-fixation plantations roots and soil moisture in Horqin sandy land

对科尔沁沙地典型固沙植物小黄柳(Salix gordejevii)、山竹子(Hedysarum fruticosum)、白柠条(Caragana korshinskii)及乌丹蒿(Artemisia wudanica)根系分布特征及同空间内土壤水分进行调查和观测。结果表明:1)四种植物根系呈浅层化分布,根系分布深度因立地水分条件不同而存在差异;小黄柳、山竹子、白柠条和乌丹蒿根系主要分布在0-60cm、0-50cm、0-40cm、0-20cm土层。2)小黄柳、山竹子具有较高的土壤水分消耗能力,根系分布与同空间内土壤水分存在正相关关系;白柠条和乌丹蒿根系分布与同空间的土壤水分呈负相关关系,两种植物深层根系空间土壤水分含量较高,有利于植被长期稳定发展。3)四种植物根-土界面研究范围表现为:小黄柳、山竹子和白柠条0-50cm土层,乌丹蒿0-20cm土层。

The study on the root distribution characters and soil moisture of typical sand- fixation plantations Salix flavida,Hedysarum fruticosum,Caragana korshinskii kom and Artemisia wudanica in Horqin sandy land showed that： 1） The roots of four sand- fixation plants were mainly distributed in shallow layers,the depth of roots were different depend on different water conditions; the root distribution of Salix flavida,Hedysarum fruticosum,Caragana korshinskii kom and Artemisia wudanica were mainly at 0- 60 cm,0- 50 cm,0- 40 cm,0-20 cm soil depth,respectively. 2） Salix flavida and Hedysarum fruticosum had a high soil water consumption capacity,and there was a positive correlation between root distribution and soil water at the same space; while,the root distribution of Caragana korshinskii kom and Artemisia wudanica was negatively correlated with soil moisture at the same space,and the higher water content was contributed to the long- term stable development of vegetation at deep soil layers. 3） The research clarified the space of the root- soil interface water transportation of four sand- fixation plantations was at 0- 50 cm soil depth for Salix flavida,Hedysarum fruticosum and Caragana korshinskii kom,0- 20 cm for Artemisia wudanica.