添加能延迟了植物生物质干旱性诱导的值的出现
Hailing Li1, César Terrer2, Miguel Berdugo3,4
1State Key Laboratory of Herbage Improvement and Grassland Agro-Ecosystems, College of Ecology, Lanzhou University, Lanzhou730000, China.
National science review
|October 30, 2023
概括
干旱地区的生态系统在干旱值时面临着突然的退化. 添加气,但不增加二氧化碳,可以通过增加植物生物质和延迟预测土地变化的关键值来减轻这种下降.
科学领域:
- 生态生态学 生态生态学
- 全球变化生物学
- 环境科学 环境科学
背景情况:
- 干旱地区容易受到土地退化和荒漠化的影响,原因是干旱度值.
- 全球变化的驱动因素,如二氧化碳 (CO2) 和 (N) 沉积的增加,可能会影响这些值.
- 这些驱动因素对生态系统对干旱的反应的影响在很大程度上是未知的.
研究的目的:
- 调查二氧化碳和的增加如何影响全球干旱地区的干旱值.
- 确定跨越这些门对植物生物质,根:芽的比率和碳库存的影响.
- 在不同的全球变化情景下,预测未来土地面积的变化超过干旱度值.
主要方法:
- 分析了超过5000次植物生物质的实证测量.
- 干旱度指数的计算 (1-降水/潜在的蒸发透气).
- 连接遥感数据 (叶面积指数) 与多个生态系统模型模拟.
主要成果:
- 超过约0.50的干旱度值导致地面生物量 (AGB) 急剧下降,根:芽比增加.
- 添加气显著增加了AGB,并将干旱度值从0.49延迟到0.55.
- 升高的二氧化碳并没有改变观察到的干旱度值.
结论:
- 添加可以减轻干旱度增加对干旱植物生物质的负面影响.
- 二氧化碳的丰富似乎没有改变干旱地植被的关键干旱度值.
- 考虑到沉积对于准确预测全球环境变化下的旱地植被变化至关重要.
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