Effect of plant species on shrub fertile island at an oasis-desert ecotone in the South Junggar Basin, China
Effect of plant species on shrub fertile island at an oasis-desert ecotone in the South Junggar Basin, China
复制标题
准噶尔盆地南部绿洲-荒漠交错带灌木肥沃岛植物种类的影响
DOI：
10.1016/j.jaridenv.2007.03.015
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发表时间：
2007-12-01
影响因子：
2.7
通讯作者：
Wang, F.
中科院分区：
文献类型：
--
作者：
Li, J.;Zhao, C.;Wang, F.
灌木肥沃的岛屿是干旱生态系统的共同特征。为了研究植物种类对单个灌木周围土壤理化性质的空间格局的影响，以两种不同形态的落叶灌木(Tamarix spp.和梭梭属(Haloxron ammodendron Bge.)在准噶尔盆地南部绿洲-荒漠交错带进行了研究。在灌木树冠下(冠层)、灌木树冠边缘垂直投影界限(外围)和灌木树冠间隙(间隙)两个深度(0~10和10~20 cm)采集土壤样品，分析土壤的理化性质。结果表明，罗望子属(Tamarix spp.与梭梭相比，它们富含更多的土壤养分(显著高于20厘米)，并且面积更大(超过树冠面积)(P<；0.05，土壤养分仅在20厘米深处检测到，小于树冠面积)。两种灌木周围的土壤质地格局更不同，柳下粗颗粒较多。冠层比灌木之间的空隙少，但梭梭冠层下的空隙比空隙少。这些差异归因于两个被研究物种在形态上的差异：梭梭的Y形树冠捕获和保持其下的落叶的能力不如Tamarix spp.的半球形树冠，这导致了梭梭灌木周围不太发达的肥沃岛屿。(C)2007爱思唯尔有限公司。保留所有权利。
Shrub fertile islands are a common feature in arid ecosystems. To examine the effect of plant species on the spatial patterns of soil chemical and physical properties surrounding individual shrubs, two deciduous shrub species with different morphologies (Tamarix spp. and Haloxylon ammodendron Bge.) were studied at an oasis-desert ecotone in South Junggar Basin. Soil samples were collected under the shrub crown (canopy), at the vertically projected limit of shrub crown margin (periphery), and in the space between shrub crowns (interspace) at two depths, 0-10 and 10-20 cm, to analyze their physical and chemical properties. The results show that the fertile islands of ;Tamarix spp. are enriched with more soil nutrients (significantly higher, P 20 cm) and in a larger area (beyond the canopied area) compared to that of H. ammodendron (significantly higher, P < 0.05, soil nutrients detected only for AN; < 20 cm in depth; smaller than the canopied area). Soil texture patterns surrounding the shrubs of the two species are even more different, with more coarse particles under the Tamarix spp. canopies compared to the interspace between shrubs but fewer under the H. ammodendron canopies compared to the interspaces. These variations are attributed to the difference in morphology of the two studied species: the Y-shaped crowns of H. ammodendron are less capable of capturing and maintaining litter under them than the hemispheroidal crowns of Tamarix spp., which leads to the less well developed fertile islands surrounding H. ammodendron shrubs. (C) 2007 Elsevier Ltd. All rights reserved.