升高的二氧化碳在变暖的条件下进一步延长生长季节
Melissa Reyes-Fox1, Heidi Steltzer2, M J Trlica3
11] USDA-ARS, Soil Plant Nutrient Research Unit and Northern Plains Area, Fort Collins, Colorado 80526, USA [2].
Nature
|April 25, 2014
概括
气候变暖通过推进春季生长延长了植物生长季节. 然而,二氧化碳 (CO2) 的高含量也起着至关重要的作用,特别是在节约水和延长植物活动方面,尤其是在水资源稀缺的地方.
科学领域:
- 植物生态学植物生态学
- 气候变化生物学 气候变化生物学
- 全球变化科学科学 全球变化科学
背景情况:
- 温带和极地地区显示较早的植物生长,通常归因于气候变暖.
- 实验性变暖研究表明,较早的现象学 (叶子脱落,开花) 可以导致较早的衰老,缩短活跃季节.
- 气候变暖和大气二氧化碳 (CO2) 增加对生长季节长度的综合影响仍未得到充分研究.
研究的目的:
- 测试一个概念模型,解释观察到更长的生长季节和实验发现之间的明显矛盾.
- 分析二氧化碳的增加如何影响植物年度生命周期事件和在变暖的气候下生长季节的长度.
- 为了确定变暖和高二氧化碳对生长季节长度变化的相对贡献.
主要方法:
- 对温带草原生态系统进行了实验性变暖.
- 引入了大气中的二氧化碳 (CO2) 度升高.
- 对各种物种进行了植物现象学监测,包括叶子的出现,开花,种子的成熟和衰老.
主要成果:
- 实验性变暖促进了早期叶子物种 (例如草) 的叶子出现.
- 晚期衰老的物种老化是恒定的或延迟的,导致生长季节更长.
- 升高的二氧化碳进一步延长了温暖草原的生长季节,通过节约水,使植物保持更长的活力,但没有延长繁殖期.
结论:
- 这项研究支持一个概念模型,即变暖促进季节早期的生长,而延迟的衰老延长了整体生长季节.
- 增加的二氧化碳有助于显著延长生长季节的长度,特别是在水资源有限的环境中,通过保护水分.
- 较长的生长季节是变暖和二氧化碳增加的结果,二氧化碳在延长活跃植物周期方面发挥着关键作用.
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