一个实用的方法来提取光系统II (PSII) 对近红外太阳诱导的叶绿素光的贡献
Chenhui Guo1, Linke Li2, Zhunqiao Liu3
1College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China.
The Science of the total environment
|August 10, 2024
概括
这项研究引入了一种新方法来隔离光系统II (PSII) 太阳引起的叶绿素光 (SIF) 信号. 这一进步提高了从SIF测量的总初级生产率 (GPP) 估计的准确性.
科学领域:
- 植物生理学 植物生理学
- 遥感是一种远程传感.
- 生态系统研究研究生态系统研究
背景情况:
- 太阳引起的叶绿素光 (SIF) 显示了估计二氧化碳同化潜力.
- SIF源自光系统I (PSI) 和光系统II (PSII).
- PSII SIF与光合作用碳固定直接相关,但顶层 SIF (SIF_TOC) 包括两个光系统的贡献.
研究的目的:
- 开发一种切实可行的方法来提取PSII对SIF_TOC的贡献.
- 在不同的环境条件下调查PSII SIF分数 (fPSII_760) 的反应.
- 提高使用SIF估计初级生产率 (GPP) 的准确性.
主要方法:
- 提出一种方法来从近红外 (NIR) 频段中从SIF_TOC提取PSII贡献 (fPSII_760) 使用红色和NIR光谱区域.
- 在受控的光和温度下开发了一种叶片尺度仪器来测量fPSII_760.
- 在冬季小麦场地估计的树冠尺度fPSII_760,并将SIF估计的GPP与的共变量数据进行比较.
主要成果:
- 叶片尺度fPSII_760随着光强度和温度的变化而变化,显示出与PSII光率的正相关性.
- 在冬季小麦中,天花板尺度fPSII_760从0.61到0.83不等.
- 使用动态fPSII_760的GPP估计比使用固定fPSII_760 (R2=0.6) 准确得多 (R2=0.84).
结论:
- 开发的方法有效地提取了PSII SIF贡献.
- 环境因素影响PSII SIF分数,影响GPP估计.
- fPSII_760的动态调整提高了基于SIF的GPP估计的可靠性,推进了生态系统监测.
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