解耦土壤水分胁迫(low soil moisture, SM) 和大气水分胁迫 (high vapor pressure deficit, VPD)对光合的影响

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1. 简介

1.1 目的：介绍两种用于解耦土壤水分胁迫(low soil moisture) 和大气水分胁迫 (high VPD) 对光合作用影响的方法

1.2 背景介绍：

(1) 为什么重要？ Why is important?

• Dryness stress can limit vegetation growth and is often characterized by low soil moisture (SM) and high atmospheric water demand (vapor pressure deficit, VPD). However, the relative role of SM and VPD in limiting ecosystem production remains debated and is difficult to disentangle, as SM and VPD are coupled through land-atmosphere interactions, hindering the ability to predict ecosystem responses to dryness [1].

(2) 目前的共识？Current understanding

• VPD-GPP relationship was strongly influenced by climatic interactions and that VPD was more important for plant water stress than SWC across most plant functional types when we removed the effect of main climatic drivers, e.g. air temperature, incoming shortwave radiation and wind speed [4].
• Humid and mesic ecosystems including forests and grasslands are dominated by VPD, while the semi-arid and arid ecosystems including shrublands and savannas are dominated by SM [2].

（3）为什么要用high temporal resolution的数据？

• VPD 和 SWC 在daily会解耦

1.3 方法（四篇经典文献）

• 1. 分bin的方法 ([1-2])

• 2. Machining learning的方法[3-4]

(1) ANN [3]

(2) Shapley additive explanations framework [4]

2. 参考文献

[1] Liu L, Gudmundsson L, Hauser M, et al. Soil moisture dominates dryness stress on ecosystem production globally[J]. Nature communications, 2020, 11(1): 4892.

[2] Xu S, Gentine P, Li L, et al. Response of Ecosystem Productivity to High Vapor Pressure Deficit and Low Soil Moisture: Lessons Learned From the Global Eddy‐Covariance Observations[J]. Earth’s Future, 2023, 11(8): e2022EF003252.

[3] Fu Z, Ciais P, Prentice I C, et al. Atmospheric dryness reduces photosynthesis along a large range of soil water deficits[J]. Nature communications, 2022, 13(1): 989.

[4] Wang H, Yan S, Ciais P, et al. Exploring complex water stress–gross primary production relationships: Impact of climatic drivers, main effects, and interactive effects[J]. Global Change Biology, 2022, 28(13): 4110-4123.