干旱区生态环境知识资源中心(Arid): Biophysical controls on nocturnal sap flow in plantation forests in a semi-arid region of northern China

Arid

DOI	10.1016/j.agrformet.2020.107904
	Biophysical controls on nocturnal sap flow in plantation forests in a semi-arid region of northern China
	Chen, Zuosinan 1; Zhang, Zhiqiang 1; Sun, Ge 2; Chen, Lixin 1; Xu, Hang 1; Chen, Shengnan 1
通讯作者	Zhang, Zhiqiang
来源期刊	AGRICULTURAL AND FOREST METEOROLOGY
ISSN	0168-1923
EISSN	1873-2240
出版年	2020
卷号	284
英文摘要	Recent studies have recognized the importance of nocturnal sap flow (Q(n)) in affecting forest carbon and water budgets and responses to climate change at stand, regional, and global scales. However, biophysical controls on Q(n) are not fully understood, and their implications for land surface and vegetation models are unclear. We measured growing season sap flow of two widely distributed afforestation species, Pinus tabuliformis and Acer truncatum, in a middle-aged and a young monoculture forest stand, respectively, in a semi-arid mountainous area of northern China. We found a convergence in Q(n) between the two species and in the proportion of Q(n) to the total sap flow (12.2-15.0%) across species and ages. Total growing season Q(n) was higher for middle-aged stands than for young stands because of larger diameters at breast height of older stands. Nighttime vapor pressure deficit (VPDn) influence on Q(n) of young stands was soil moisture dependent. Nighttime wind speed indirectly controlled Q(n) through enhancing VPDn in young stands and directly promoted Q(n) in middle-aged stands with relatively low tree densities. For each species, both increased and decreased soil water content were able to promote Q(n) in stands with relatively dry soils, which might be due to enhanced nighttime water recharge for capacitance refilling and for avoiding hydraulic failure under prolonged water stress, respectively. Total effects of these three environmental factors explained less than 55% of the Q(n) variations. This study highlights uncertain physiological influences of VPDn on nighttime stomatal water loss, the nighttime water loss induced by wind, region-specific patterns of nighttime water recharge, and the importance of biotic controls on Q(n). Our findings help to improve the existing VPD-based method for partitioning nighttime transpiration and water recharge at tree and stand levels, and suggest the importance of incorporating nocturnal sap flow into large-scale models.
英文关键词	Nocturnal sap flow Tree species Tree age Biophysical control Semi-arid region Nighttime sap flow partitioning
类型	Article
语种	英语
国家	Peoples R China ; USA
收录类别	SCI-E
WOS记录号	WOS:000525817500021
WOS关键词	NATURAL TEMPERATURE-GRADIENTS ; NIGHTTIME WATER-USE ; THERMAL DISSIPATION PROBES ; STOMATAL CONDUCTANCE ; SOIL-WATER ; HYDRAULIC REDISTRIBUTION ; POPULUS-EUPHRATICA ; CANOPY CONDUCTANCE ; SUMMER DROUGHT ; CLIMATE-CHANGE
WOS类目	Agronomy ; Forestry ; Meteorology & Atmospheric Sciences
WOS研究方向	Agriculture ; Forestry ; Meteorology & Atmospheric Sciences
来源机构	北京林业大学 ; E18
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/313925
作者单位	1.Beijing Forestry Univ, Coll Soil & Water Conservat, Key Lab Soil & Water Conservat & Desertificat Com, State Forestry & Grassland Adm, Beijing 100083, Peoples R China; 2.US Forest Serv, Eastern Forest Environm Threat Assessment Ctr, USDA, Res Triangle Pk, NC 27709 USA
推荐引用方式 GB/T 7714	Chen, Zuosinan,Zhang, Zhiqiang,Sun, Ge,et al. Biophysical controls on nocturnal sap flow in plantation forests in a semi-arid region of northern China[J]. 北京林业大学, E18,2020,284.
APA	Chen, Zuosinan,Zhang, Zhiqiang,Sun, Ge,Chen, Lixin,Xu, Hang,&Chen, Shengnan.(2020).Biophysical controls on nocturnal sap flow in plantation forests in a semi-arid region of northern China.AGRICULTURAL AND FOREST METEOROLOGY,284.
MLA	Chen, Zuosinan,et al."Biophysical controls on nocturnal sap flow in plantation forests in a semi-arid region of northern China".AGRICULTURAL AND FOREST METEOROLOGY 284(2020).