Arid
DOI10.1007/s11284-016-1396-1
Contrasting hydraulic strategies in Salix psammophila and Caragana korshinskii in the southern Mu Us Desert, China
Li, Yangyang1; Chen, Weiyue2; Chen, Jiacun1; Shi, Hui3
通讯作者Li, Yangyang
来源期刊ECOLOGICAL RESEARCH
ISSN0912-3814
EISSN1440-1703
出版年2016
卷号31期号:6页码:869-880
英文摘要

Salix psammophila and Caragana korshinskii are two common shrubs in the southern Mu Us Desert, China. Their hydraulic strategies for adapting to this harsh, dry desert environment are not yet clear. This study examined the hydraulic transport efficiency, vulnerability to cavitation, and daily embolism refilling in the leaves and stems of these two shrubs during the dry season. In order to gain insight into water use strategies of whole plants, other related traits were also considered, including daily changes in stomatal conductance, leaf mass per area, leaf pressure-volume parameters, wood density and the Huber value. The leaves and stems of S. psammophila had greater hydraulic efficiency, but were more vulnerable to drought-induced hydraulic dysfunction than C. korshinskii. The difference between leaf and stem water potential at 50 % loss of conductivity was 0.12 MPa for S. psammophila and 0.81 MPa for C. korshinskii. Midday stomatal conductance decreased by 74 % compared to that at 8:30 in S. psammophila, whereas no change occurred in C. korshinskii. Daily embolism and refilling occurred in the stems of S. psammophila and leaves of C. korshinskii. These results suggest that a stricter stomatal regulation, daily embolism repair in stems, and a higher stem water capacitance could be partially compensating for the greater susceptibility to xylem embolism in S. psammophila, whereas higher leaf elastic modulus, greater embolism resistance in stems, larger difference between leaf and stem hydraulic safety, and drought-induced leaf shedding in C. korshinskii were largely responsible for its more extensive distribution in arid and desert steppes.


英文关键词Cavitation Daily embolism and refilling Hydraulic conductivity Safety margin Shrubs
类型Article
语种英语
国家Peoples R China
收录类别SCI-E
WOS记录号WOS:000387344900011
WOS关键词CAVITATION RESISTANCE ; STOMATAL CONDUCTANCE ; WOODY-PLANTS ; WATER-STATUS ; XYLEM VULNERABILITY ; DROUGHT RESISTANCE ; LEAF HYDRAULICS ; EMBOLISM REPAIR ; SAFETY MARGINS ; RAIN-FOREST
WOS类目Ecology
WOS研究方向Environmental Sciences & Ecology
来源机构西北农林科技大学
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/192448
作者单位1.Northwest A&F Univ, Inst Soil & Water Conservat, State Key Lab Soil Eros & Dryland Farming Loess P, 26 Xinong Rd, Yangling 712100, Shaanxi, Peoples R China;
2.Northwest A&F Univ, Coll Forestry, Yangling 712100, Shaanxi, Peoples R China;
3.Xian Univ Architecture & Technol, Sch Environm & Municipal Engn, Xian 710055, Shaanxi, Peoples R China
推荐引用方式
GB/T 7714
Li, Yangyang,Chen, Weiyue,Chen, Jiacun,et al. Contrasting hydraulic strategies in Salix psammophila and Caragana korshinskii in the southern Mu Us Desert, China[J]. 西北农林科技大学,2016,31(6):869-880.
APA Li, Yangyang,Chen, Weiyue,Chen, Jiacun,&Shi, Hui.(2016).Contrasting hydraulic strategies in Salix psammophila and Caragana korshinskii in the southern Mu Us Desert, China.ECOLOGICAL RESEARCH,31(6),869-880.
MLA Li, Yangyang,et al."Contrasting hydraulic strategies in Salix psammophila and Caragana korshinskii in the southern Mu Us Desert, China".ECOLOGICAL RESEARCH 31.6(2016):869-880.
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