
Meta-analyses of responses of sap flow to changes in environmental factors
ZHANG Ruiting, YANG Jinyan, RUAN Honghua
JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2022, Vol. 46 ›› Issue (5) : 113-120.
Meta-analyses of responses of sap flow to changes in environmental factors
【Objective】The relationship between sap flow and biotic and abiotic factors was examined at the ecosystem and global scales. The influencing factors were parameterized to estimate the global sap flow, and the impact of human-controlled environmental experiments on sap flow was quantitatively analyzed.【Method】Sap flow data from 106 published studies (2001-2019) were collected for our study by using meta-analysis. The response of the sap flow density (Fd) to biotic and abiotic factors was studied at the ecosystem and global scales, and the relationships among sap flow and different factors including the mean annual temperature (MAT), mean annual precipitation (MAP), saturated vapor pressure deficit (VPD), photosynthetically active radiation (PAR), and the soil moisture content (ρ) was determined using multiple regression.【Result】The diameter at breast height (DBH) and the leaf area index (LAI) were highly correlated with Fd at the ecosystem and global scales. The VPD was negatively correlated with Fd. The Fd was estimated through a parametric model based on MAT, MAP, VPD, DBH and the soil volumetric water content. Different manipulative experiments affected forest transpiration through their effects on the associated environmental factors.【Conclusion】The sap flow is predominantly determined by biological and environmental factors and the degree of influence depends on the ecosystem. Human activities lead to changes in the environmental factors, which in turn affect the sap flow and transpiration.
sap flow / diameter at breast height / leaf area index / vapor pressure deficit / soil moisture content
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