果和梨树的数十年树环稳定同位素记录表明,高山山谷对环境变化的生态生理反应一致
Nilendu Singh1,2, Massimo Tagliavini1, Enrico Tomelleri1
1Faculty of Agricultural, Environmental and Food Sciences, Free University of Bolzano, Bolzano, Italy.
Frontiers in plant science
|January 27, 2025
概括
意大利的老果和梨树由于大气二氧化碳 (CO2) 和温度升高而提高了用水效率,这表明碳同化得到了增强. 这些发现提供了对农业生态系统应对气候变化的见解.
科学领域:
- 农业生态系统科学 农业生态系统科学
- 气候变化研究研究气候变化研究
- 植物生态生理学植物生态生理学
背景情况:
- 气候变化和大气二氧化碳 (CO2) 增加对农业生态系统的影响比森林生态系统了解得更少.
- 果树对气候变化和二氧化碳增加的长期生态生理反应需要进一步研究.
研究的目的:
- 研究气候变化和大气二氧化碳增加对果和梨的生态系统的生态生理学和生态水文学影响.
- 用树环稳定同位素重建内在用水效率 (iWUE) 和碳同化的长期趋势.
- 确定气候变量 (温度,降雨) 和二氧化碳对树木生理学的影响.
主要方法:
- 从北意大利的老果树 (1976-2021) 和梨树 (1943-2021) 开发长期树环稳定同位素记录 (δ13C和δ18O).
- 重建生态生理学参数,包括内在用水效率 (iWUE) 和细胞间二氧化碳度 (Ci).
- 统计分析以将同位素数据与气候变量和大气二氧化碳度相关联.
主要成果:
- 自20世纪80年代末以来,在果树和梨树中观察到细胞间二氧化碳度 (Ci) 和内在用水效率 (iWUE) 的持续增加.
- 与梨树相比,果树表现出更高的iWUE,主要是由于二氧化碳受精效应.
- 最低生长季节温度被确定为影响iWUE的重要因素,除了CO2受精外,降水的影响较小.
- 稳定的氧同位素 (δ18O) 表明当地水气候相对稳定,并结合的δ13C-δ18O分析证实碳同化增加而不是蒸发转化减少.
结论:
- 大气中二氧化碳的增加和温度的升高显著提高了果和梨的农业生态系统中的碳同化和用水效率.
- 果树和梨树对气候变化表现出不同的生理反应,果树表现出更大的可塑性.
- 长期树环同位素数据为校准模型和预测未来气候场景下的农业生态系统行为提供了宝贵的见解.
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