DOI: 10.1016/j.foreco.2019.117730
论文题名: Sap flow changes and climatic responses over multiple-year treatment of rainfall exclusion in a sub-humid black locust plantation
作者: He Q.-Y. ; Yan M.-J. ; Miyazawa Y. ; Chen Q.-W. ; Cheng R.-R. ; Otsuki K. ; Yamanaka N. ; Du S.
刊名: Forest Ecology and Management
ISSN: 3781127
出版年: 2020
卷: 457 语种: 英语
英文关键词: Black locust
; Drought resistance
; Granier-type sensor
; Rainfall exclusion
; Robinia pseudoacacia
; Sap flow
; Transpiration
Scopus关键词: Arid regions
; Climate change
; Drought
; Rain
; Reforestation
; Soil moisture
; Transpiration
; Black locust
; Drought resistance
; Global climate changes
; Meteorological variables
; Pre-dawn leaf water potentials
; Precipitation patterns
; Robinia pseudo-acacia
; Sap flow
; Plants (botany)
; climate change
; deciduous tree
; drought
; global climate
; leaf area
; potential evapotranspiration
; precipitation (climatology)
; rainfall
; sap flow
; sensor
; throughfall
; transpiration
; Drought
; Precipitation
; Rain
; Reforestation
; Robinia
; Sap
; Transpiration
; China
; Robinia pseudoacacia
英文摘要: Black locust (Robinia pseudoacacia) plantations have been widely established in the semiarid and sub-humid areas of central China. Under the condition of global climate change, which is introducing much uncertainty of precipitation patterns in this region, it is of special significance to investigate their responses to precipitation. Here, we investigated sap flow response to reduced throughfall. Stem sap flow was measured from 2011 to 2017 using Granier-type sensors. By placing waterproof panels within tree rows, about 47.5% precipitation was excluded from treated plots since April 2015. Differences in soil water content gradually increased to 4.3% between treated and control plots with continued throughfall exclusion. Decreased precipitation input significantly reduced the average sap flux density in treated plots by 9.1%–45.3%. The extent of this reduction depended on precipitation in the previous and current years. Transpiration and forest growth were negatively affected by the treatment. Furthermore, sap flow response to environmental factors became insensitive, with the discrepancy increasing with increasing drought duration, but was regained by rainfall recharge to soil water in the first two treatment years. However, prolonged drought might damage transpiration resilience capacity, as the saturated sap flux after soil water recharging during the wet period was still lower than that in the control plot in the latter year. Predawn leaf water potential was significantly lower in the treated plot compared to the control plot, whereas midday leaf water potential was similar. Whole tree hydraulic conductance (GP) was also similar between the two plots, except in extreme drought months when GP was much lower in the treated plot. In addition, the specific leaf area and stomatal density decreased in the treated plot. Therefore, decreases in precipitation would cause a transpiration reduction, weakening the tree's response to meteorological variables and lowering growth and productivity, potentially damaging transpiration resilience. These results suggest that black locust is sensitive to water changes, its capacity of drought tolerant is restrained by the drought time scale or drought severity, the use of such species in reforestation in semiarid regions should be implemented with caution. © 2019 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/159430
Appears in Collections: 气候变化与战略
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作者单位: State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A&F University, Yangling, Shaanxi 712100, China; College of Forestry, Northwest A&F University, Yangling, Shaanxi 712100, China; Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi 712100, China; Office for Campus Planning, Kyushu University, Motooka, Fukuoka 8190395, Japan; Kasuya Research Forest, Kyushu University, Sasaguri, Fukuoka 8112415, Japan; Arid Land Research Center, Tottori University, Hamasaka, Tottori, 6800001, Japan
Recommended Citation:
He Q.-Y.,Yan M.-J.,Miyazawa Y.,et al. Sap flow changes and climatic responses over multiple-year treatment of rainfall exclusion in a sub-humid black locust plantation[J]. Forest Ecology and Management,2020-01-01,457