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How plant production in the Mongolian grasslands is affected by wind-eroded coarse-textured topsoil
Journal of Arid Environments ( IF 2.7 ) Pub Date : 2021-03-17 , DOI: 10.1016/j.jaridenv.2021.104443
Kaman Kong , Banzragch Nandintsetseg , Masato Shinoda

Wind erosion results in soil redistribution and textural changes on topsoil. There is little information about how these changes affect plant production. Here, we compared simulations of vegetation growth between a wind-eroded scenario and an actual condition at two sites in Mongolian grasslands (steppe and desert steppe) using an ecosystem model. The wind-eroded scenario, topsoil (0–0.1 m depth) with 1% clay and 99% sand, was designed to represent an extremely wind-eroded soil surface that had permanently lost the fine particles and gained sand particles. Effects of temperature, nutrient, and water stresses on vegetation were quantitatively estimated. The model gave reasonably good simulations of the vegetation and soil water dynamics. Results show that water had more effect on plant production than nitrogen and temperature. In the wind-eroded scenario, stresses because of a lack of water and nutrients affected plant production. For the wind-eroded topsoil, plant production decreased (20.2%) in the desert steppe with increasing water stress, but it was slightly increased (5.0%) in the wetter steppe because of an inverse texture effect, where water infiltrates from the coarse topsoil to the deeper root-zone due to lower soil evapotranspiration and facilitates growth. Plant growth was, therefore, affected by the nitrogen supply.



中文翻译:

风蚀的粗纹表层土如何影响蒙古草原的植物生产

风蚀导致土壤重新分布和表层土壤的质地变化。关于这些变化如何影响植物生产的信息很少。在这里,我们使用生态系统模型比较了蒙古草原两个地区(草原和沙漠草原)的风蚀情景和实际状况之间的植被生长模拟。风蚀的情况是表土(0-0.1 m深度),粘土含量为1%,砂为99%,被设计为代表极度风蚀的土壤表面,永久失去了细颗粒并获得了沙粒。定量估计了温度,养分和水分胁迫对植被的影响。该模型对植被和土壤水分动力学给出了相当好的模拟。结果表明,水对植物生产的影响大于氮和温度。在风蚀的情况下,由于缺乏水分和养分而产生的压力影响了植物的产量。对于风蚀的表土,沙漠草原的植物产量随着水分胁迫的增加而下降(20.2%),而在湿润的草原中,植物的产量由于纹理的逆向影响而略有增加(5.0%),其中水分从粗糙的表层土壤中渗入由于较低的土壤蒸散作用而使根系向较深的根部区域生长并促进其生长。因此,植物生长受到氮供应的影响。由于较低的土壤蒸散量,水从较粗的表层土壤渗透到更深的根部区域,并促进了土壤的生长。因此,植物生长受到氮供应的影响。由于较低的土壤蒸散量,水从较粗的表层土壤渗透到更深的根部区域,并促进了土壤的生长。因此,植物生长受到氮供应的影响。

更新日期:2021-03-17
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