• 主题
高级搜索  >
历史搜索 清空历史
首页> 美国卫生研究院文献>Ecology and Evolution >Community carbon and water exchange responses to warming and precipitation enhancement in sandy grassland along a restoration gradient
【2h】

Community carbon and water exchange responses to warming and precipitation enhancement in sandy grassland along a restoration gradient

机译：恢复梯度下沙质草地群落碳和水交换对增暖和增雨的响应

代理获取
本网站仅为用户提供外文OA文献查询和代理获取服务，本网站没有原文。下单后我们将采用程序或人工为您竭诚获取高质量的原文，但由于OA文献来源多样且变更频繁，仍可能出现获取不到、文献不完整或与标题不符等情况，如果获取不到我们将提供退款服务。请知悉。
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Temperature increasing and precipitation alteration are predicted to occur in arid and semiarid lands; however, the response mechanism of carbon and water exchange at community level is still unclear in semiarid sandy land. We investigated the responses of carbon and water exchanges to warming and precipitation enhancement along a sand dune restoration gradient: mobile sand dunes (MD), semifixed sand dunes (SFD), and fixed sand dunes (FD). The average net ecosystem productivity (NEP) and evapotranspiration (ET) between May and August increased by 98% and 59%, respectively, from MD to SFD, while they had no significant differences between FD and the other two habitats. Warming inhibited ecosystem NEP, ET, and water use efficiency (WUE) by 69%, 49% (p < .001), and 80%, respectively, in SFD, while it nearly had no significant effects in MD and FD. However, precipitation addition by 30% nearly had no significant effects on community NEP, ET, and WUE, except for warming treatment in FD. In general, precipitation addition of 30% may still not be enough to prevent drought stress for growth of plants, due to with low water holding capacity and high evaporation rates in sandy land. Temperature increase magnified drought stress as it increased evapotranspiration rates especially in summer. In addition, community NEP, ET, and WUE were usually influenced by interactions between habitats and temperature, as well as the interactions among habitats, temperature, and precipitation. Species differences in each habitat along the restoration gradient may alter climate sensitivity of sandy land. These results will support in understanding and the prediction of the impacts of warming and precipitation change in semiarid sandy grassland.
机译：预计干旱和半干旱地区会出现温度升高和降水变化的现象。然而，在半干旱沙地上，社区碳和水交换的响应机制仍不清楚。我们沿着沙丘恢复梯度调查了碳和水交换对变暖和降水增加的响应：移动沙丘（MD），半固定沙丘（SFD）和固定沙丘（FD）。从MD到SFD，5月和8月之间的平均净生态系统生产力（NEP）和蒸散（ET）分别增加了98％和59％，而FD与其他两个栖息地之间没有显着差异。变暖使SFD的生态系统NEP，ET和水分利用效率（WUE）分别降低了69％，49％（p <.001）和80％，而对MD和FD几乎没有显着影响。然而，除了FD的增温处理外，增加30％的降水量对社区的NEP，ET和WUE几乎没有显着影响。通常，由于沙地中的持水量低和蒸发率高，添加30％的降水可能仍不足以防止干旱对植物的生长造成压力。温度升高加剧了干旱胁迫，因为它增加了蒸散速率，尤其是在夏季。此外，社区NEP，ET和WUE通常受生境与温度之间的相互作用以及生境，温度和降水之间相互作用的影响。每个生境沿恢复梯度的物种差异可能会改变沙地的气候敏感性。这些结果将有助于理解和预测半干旱沙质草地变暖和降水变化的影响。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
代理获取

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号