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首页> 外文期刊>European Journal of Agronomy >Interactive effects of free-air CO2 enrichment and drought stress on maize growth
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Interactive effects of free-air CO2 enrichment and drought stress on maize growth

机译：空气中二氧化碳富集和干旱胁迫对玉米生长的相互作用

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Predicting future maize yields requires quantifying anticipated climate change impacts on maize growth and yield. In the present study, maize was grown over 2 years (2007 and 2008) under sufficient (WET) and reduced water supply (DRY) and under ambient (378 mu l l(-1), AMB) and elevated (550 mu l l(-1), FACE) atmospheric CO2 concentration ([CO2]) using free air CO2 enrichment (FACE). The objective of the present study was to test the hypothesis that maize growth does not respond to elevated [CO2] under WET but under DRY conditions due to an increase of water use efficiency (WUE) of biomass production realized through reduced transpiration. Moreover, in 2008 soil cover was varied to test whether mitigation of evaporation by straw mulch increases the CO2 effect on WUE. The DRY treatment received 12% and 48% less water than the WET treatment in 2007 and 2008, respectively, which was achieved with the aid of rainout shelters. In the first year, drought stress was insignificant and crop growth was similar among the two watering regimes. CO2 enrichment did not affect crop growth in 2007 and also in the WET treatment of 2008. In the second year, a pronounced drought stress decreased green leaf index, accumulated seasonal radiation absorption and radiation use efficiency (RUE) significantly. However, these effects were mitigated by CO2 enrichment and the decrease of RUE was higher under AMB (-18%) than under FACE (-2%) conditions. In the DRY treatment in 2008, CO2 enrichment significantly increased final biomass (+24%) and grain yield (+41%) as compared to the DRY AMB treatment. CO2 enrichment significantly increased soil water content under WET and DRY conditions but did not affect the soil water exploitation. There was a significant interaction of [CO2] and water supply on WUE with no (2007) or a small CO2-response (+10% in 2008) under WET and a strong effect under DRY conditions in 2008 (+25%). Soil cover did not intensify the CO2 effect on WUE. It is concluded that maize will benefit from the increase in [CO2] only under drought but not under sufficient water supply. (C) 2012 Elsevier B.V. All rights reserved.
机译：预测未来玉米单产需要量化预期的气候变化对玉米生长和单产的影响。在本研究中，玉米在2年（2007年和2008年）的条件下（WET），水供应减少（DRY），在环境（378 mu ll（-1），AMB）和高水平（550 mu ll（- 1），FACE）使用自由空气CO2浓缩（FACE）的大气CO2浓度（[CO2]）。本研究的目的是检验以下假设：在WET下，但在DRY条件下，由于通过减少蒸腾作用实现的生物质生产的水分利用效率（WUE）的提高，玉米的生长不会对[CO2]升高做出反应。此外，2008年对土壤覆盖进行了变化，以测试秸秆覆盖减轻蒸发是否增加了WUE的CO2效应。 DRY处理在2007年和2008年的用水量分别比WET处理少12％和48％，这是通过防雨棚实现的。在第一年中，两种灌溉方式的干旱压力微不足道，而作物的生长也相似。 CO2的富集在2007年和2008年的WET处理中都没有影响作物的生长。第二年，明显的干旱胁迫降低了绿叶指数，累积的季节性辐射吸收和辐射利用效率（RUE）。但是，这些影响通过二氧化碳富集得到缓解，AMB（-18％）条件下RUE的降低高于FACE（-2％）条件下的RUE降低。与DRY AMB处理相比，2008年的DRY处理中，CO2富集显着提高了最终生物量（+ 24％）和谷物产量（+ 41％）。在WET和DRY条件下，CO2富集显着增加了土壤含水量，但并未影响土壤水分的开采。在WUE上[CO2]和水供应之间存在显着的交互作用，在WET下没有（2007年）或有较小的CO2响应（在2008年增加10％），而在DRY条件下在2008年产生了强烈的影响（+ 25％）。土壤覆盖没有增强二氧化碳对水分利用效率的影响。得出的结论是，仅在干旱下而不在充足的水供应下，玉米才能从[CO2]的增加中受益。 （C）2012 Elsevier B.V.保留所有权利。

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