...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Tree Physiology >Effects of predicted future and current atmospheric temperature and [CO2] and high and low soil moisture on gas exchange and growth of Pinus taeda seedlings at cool and warm sites in the species range.
【24h】

Effects of predicted future and current atmospheric temperature and [CO2] and high and low soil moisture on gas exchange and growth of Pinus taeda seedlings at cool and warm sites in the species range.

机译：预测的未来和当前大气温度以及[CO 2 ]和高低土壤水分对该物种在凉爽和温暖点的 Pinus taeda 幼苗气体交换和生长的影响范围。

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Predicted future changes in air temperature and atmospheric CO2 concentration ([CO2]), coupled with altered precipitation, are expected to substantially affect tree growth. Effects on growth may vary considerably across a species range, as temperatures vary from sub-optimal to supra-optimal for growth. We performed an experiment simultaneously at two locations in the current range of loblolly pine, a cool site and a warm site, to examine the effect of future climate conditions on growth of loblolly pine seedlings in contrasting regions of the species range. At both sites 1-year-old loblolly pine seedlings were grown in current (local ambient temperature and [CO2]) and predicted future atmospheric conditions (ambient +2 degrees C temperature and 700 mol mol-1 [CO2]). Additionally, high and low soil moisture treatments were applied within each atmospheric treatment at each site by altering the amount of water provided to the seedlings. Averaged across water treatments, photosynthesis (Anet) was 31% greater at the cool site and 34% greater at the warm site in elevated temperature and [CO2] compared with ambient temperature. Biomass accumulation was also stimulated by 38% at the cool site and by 24% at the warm site in that treatment. These results suggest that a temperature increase of 2 degrees C coupled with an increase in [CO2] (predicted future climate) will create conditions favorable for growth of this species. Reduced soil moisture decreased growth in both current and predicted atmospheric conditions. Biomass accumulation and Anet were reduced by ~39 and 17%, respectively, in the low water treatment. These results suggest that any benefit of future atmospheric conditions may be negated if soil moisture is reduced by altered precipitation patterns.
机译：预计未来气温和大气中CO 2 浓度（[CO 2 ]）的变化以及降水的变化将对树木的生长产生重大影响。在不同的物种范围内，对生长的影响可能会发生很大的变化，因为温度对于生长而言从次优温度变化到次优温度。我们在目前的火炬松范围内的两个位置（凉爽的地方和温暖的地方）同时进行了一项实验，以检验未来气候条件对物种范围不同区域中火炬松幼苗生长的影响。在两个地点，均在当前环境（当地环境温度和[CO 2 ]）下生长1岁的火炬松幼苗，并预测未来的大气条件（环境温度+2摄氏度和700 mol mol > -1 [CO 2 ]）。另外，通过改变提供给幼苗的水量，在每个地点的每个大气处理中进行高土壤湿度处理和低土壤湿度处理。在升高的温度和[CO 2 ]与环境温度相比。在该处理中，生物质的积累在凉爽的地方刺激了38％，在温暖的地方刺激了24％。这些结果表明，温度升高2摄氏度，同时[CO 2 ]的增加（预测的未来气候）将创造有利于该物种生长的条件。减少土壤水分会降低当前和预计大气条件下的生长。在低水处理中，生物量积累和 A net 分别减少了约39％和17％。这些结果表明，如果通过改变降水方式减少土壤水分，对未来大气条件的任何好处都会被抵消。

著录项

相似文献

  • 外文文献
获取原文

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