干旱区生态环境知识资源中心(Arid): Sap Flow in Aleppo Pine in Greece in Relation to Sapwood Radial Gradient, Temporal and Climatic Variability

Arid

DOI	10.3390/f12010002
	Sap Flow in Aleppo Pine in Greece in Relation to Sapwood Radial Gradient, Temporal and Climatic Variability
	Korakaki, Evangelia; Fotelli, Mariangela N.
通讯作者	Fotelli, MN (corresponding author), Hellen Agr Org Demeter, Forest Res Inst, Thessaloniki 57006, Greece.
来源期刊	FORESTS
EISSN	1999-4907
出版年	2021
卷号	12 期号:1
英文摘要	Research Highlights: The radial gradient of sap flux density (Js) and the effects of climatic factors on sap flow of Aleppo pine were assessed at different time scales in an eastern Mediterranean ecosystem to improve our understanding of the species water balance. Background and Objectives: Aleppo pine's sap flow radial profile and responses to environmental parameters in the eastern Mediterranean were, to our best knowledge, originating to date from more arid planted forests. Information from natural forests in this region was lacking. Our objectives were to (a) determine the species' radial variability in Js on a diurnal and seasonal basis and under different climatic conditions, (b) scale up to tree sap flow taking into account the radial profile of Js and (c) determine the responses of Aleppo pine's sap flow over the year to climatic variability. Materials and Methods: Js was monitored in Aleppo pine in a natural forest in northern Greece with Granier's method using sensors at three sapwood depths (21, 51, and 81 mm) during two periods differing in climatic conditions, particularly in soil water availability. Results: Js was the highest at 21 mm sapwood depth, and it declined with increasing depth. A steeper gradient of Js in deep sapwood was observed under drier conditions. The same patterns of radial variability in Js were maintained throughout the year, but the contribution of inner sapwood to sap flow was the highest in autumn when the lower seasonal Js was recorded in both study periods. Not taking into account the radial gradient of Js in the studied Aleppo pine would result in a c. 20.2-27.7 % overestimation of total sap flow on a sapwood basis (Qs), irrespective of climatic conditions. On a diurnal and seasonal basis, VPD was the strongest determinant of sap flux density, while at a larger temporal scale, the effect of soil water content was evident. At SWC > 20% sap flow responded positively to increasing solar radiation and VPD, indicating the decisive role of water availability in the studied region. Moreover, in drier days with VPD > 0.7 KPa, SWC controlled the variation of sap flow. Conclusions: There is a considerable radial variability in Js of the studied Aleppo pine and a considerable fluctuation of sap flow with environmental dynamics that should be taken into account when addressing the species water balance.
英文关键词	sap flux radial profile sapwood depth Aleppo pine diurnal variation seasonal variation climate
类型	Article
语种	英语
开放获取类型	gold
收录类别	SCI-E
WOS记录号	WOS:000610228500001
WOS关键词	VAPOR-PRESSURE DEFICIT ; WATER-USE ; FLUX-DENSITY ; HYDRAULIC CONDUCTANCE ; TRANSPIRATION ; GROWTH ; FOREST ; TREES ; RESPONSES ; VELOCITY
WOS类目	Forestry
WOS研究方向	Forestry
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/347892
作者单位	[Korakaki, Evangelia] Hellen Agr Org Demeter, Inst Mediterranean & Forest Ecosyst, POB 14180, Athens 11528, Greece; [Fotelli, Mariangela N.] Hellen Agr Org Demeter, Forest Res Inst, Thessaloniki 57006, Greece
推荐引用方式 GB/T 7714	Korakaki, Evangelia,Fotelli, Mariangela N.. Sap Flow in Aleppo Pine in Greece in Relation to Sapwood Radial Gradient, Temporal and Climatic Variability[J],2021,12(1).
APA	Korakaki, Evangelia,&Fotelli, Mariangela N..(2021).Sap Flow in Aleppo Pine in Greece in Relation to Sapwood Radial Gradient, Temporal and Climatic Variability.FORESTS,12(1).
MLA	Korakaki, Evangelia,et al."Sap Flow in Aleppo Pine in Greece in Relation to Sapwood Radial Gradient, Temporal and Climatic Variability".FORESTS 12.1(2021).