Rhombomys opimus contribution to the “fertile island” effect of tamarisk mounds in Junggar Basin
Rhombomys opimus contribution to the “fertile island” effect of tamarisk mounds in Junggar Basin
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DOI：
10.1007/s11284-012-0952-6
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发表时间：
2012-04
影响因子：
2
通讯作者：
Wenxuan Xu;Wei Liu;Weikang Yang;C. Tang;D. Blank
中科院分区：
文献类型：
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作者：
Wenxuan Xu;Wei Liu;Weikang Yang;C. Tang;D. Blank
肥沃的岛屿是通过物理和生物介导的过程相结合而形成和维持的。植物已被证明在肥沃岛屿的形成中非常重要，最近的研究表明，穴居动物的活动对土壤的理化性质有重大影响，可以促进肥沃岛屿的发展。在本文中，我们选择Tamarixspp. -一个建设性的物种，生长在绿洲-沙漠交错带，和大沙鼠（Rhombomys opimus）-一种广泛分布在中亚的啮齿动物，以研究大沙鼠对土壤养分动态的影响在tamelik土堆。结果表明，肥沃的岛屿存在于塔木斯克土丘没有洞穴的大沙鼠。然而，大沙鼠的挖洞活动促进了塔木斯克土丘的肥岛效应：沙鼠活动频繁的灌木下的土壤养分在15~50 cm的表层和深层土壤中均显著高于土丘间区域。有啮齿动物洞穴的土墩中的有效氮是相同深度的无洞穴土墩中有效氮的两倍多。大沙鼠的挖洞活动促进了塔木斯克土丘土壤养分的集中。
Fertile islands are created and maintained by a combination of physical and biologically mediated processes. Plants have been shown to be very important in the formation of fertile islands, and recent research indicates that the activities of burrowing animals have a significant influence on the physiochemical properties of soil that can promote the development of fertile islands. In this paper, we chose tamarisk (Tamarixspp.)—a constructive species that grows in the oasis-desert ecotone, and the great gerbil (Rhombomys opimus)—a widely distributed rodent in Central Asia to study the influence of great gerbils on soil nutrient dynamics in tamarisk mounds. Results indicate that fertile islands exist in tamarisk mounds without burrows of the great gerbil. However, the great gerbil’s burrowing activities promote the fertile island effect in tamarisk mounds: soil nutrients under shrubs with great gerbil activity were significantly higher than inter-mound areas in both surface soil and deep soil from 15 to 50 cm. Available nitrogen in mounds with rodent burrows was over twice as high as in tamarisk mounds without burrows at the same depth. The great gerbil’s burrowing activities promote the concentration of soil nutrients in the tamarisk mounds.