干旱区生态环境知识资源中心(Arid): Relationships between Xylem Transport, Anatomical, and Mechanical Traits at Organ Level of Two Cupressaceae Species

Arid

DOI	10.3390/f13101564
	Relationships between Xylem Transport, Anatomical, and Mechanical Traits at Organ Level of Two Cupressaceae Species
	Xie, Jiang-Bo; Zhang, Bo-Na; Wang, Zhong-Yuan
通讯作者	Wang, ZY
来源期刊	FORESTS
EISSN	1999-4907
出版年	2022
卷号	13 期号:10
英文摘要	Compared to arid regions, forests in humid regions can be more vulnerable to drought as they are not used to, and thus not adapted to, water stress. Therefore, it is vital to understand the drought responses of woodland species in humid areas. Xylem structures and functions of species growing in the humid regions are the key to their drought responses. Two Cupressaceae species (including three taxa: Sequoia sempervirens, Taxodium distichum and its variety Taxodium distichum var. imbricatum) grown in a mesic common garden were targeted, and their xylem hydraulic function (hydraulic conductivity, K-s; cavitation resistance, P-50), anatomical structure (tracheid and pit structure), and mechanical support (wood density, WD; tracheid thickness-to-span ratio, Ttob) were measured. Likewise, we analyzed the differences in hydraulic function and anatomical structure of xylem in branches and roots, and the quantitative relationship between xylem water transport, anatomical structure, and mechanical support. Our results showed that roots had a higher hydraulic conductivity and a weaker cavitation resistance than branches. There was no safety-efficiency trade-off in the branches and roots within species. Tracheid mechanical support had a trade-off relationship with K-s or P-50 (negative correlation appeared in branch K-s similar to WD and root K-s similar to Ttob of S. sempervirens, root P-50 similar to Ttob of T. distichum var. imbricatum, and branch P-50 similar to WD). There was no trade-off in anatomical structure, which led to no safety-efficiency trade-off in xylem function. Our results suggest that the two species exhibit both low efficiency and low safety in xylem, and that there is no safety-efficiency trade-off in branches and roots. The reason behind this is that the structural demand for high safety and high efficiency differs (i.e., the root K-s of S. sempervirens was strongly controlled by D-h; in contrast, the root P-50 of S. sempervirens was strongly determined by tracheid density, N). Namely, the structural basis for a safety-efficiency trade-off does not exist and therefore trade-offs cannot be achieved.
英文关键词	climate change humid area Cupressaceae hydraulic efficiency cavitation resistance
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:000873066500001
WOS关键词	CAVITATION RESISTANCE ; HYDRAULIC EFFICIENCY ; WOOD DENSITY ; DOUGLAS-FIR ; VULNERABILITY ; STEM ; SAFETY ; CONDUCTIVITY ; POPULATIONS ; RESPONSES
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/2XILL650/392633
推荐引用方式 GB/T 7714	Xie, Jiang-Bo,Zhang, Bo-Na,Wang, Zhong-Yuan. Relationships between Xylem Transport, Anatomical, and Mechanical Traits at Organ Level of Two Cupressaceae Species[J],2022,13(10).
APA	Xie, Jiang-Bo,Zhang, Bo-Na,&Wang, Zhong-Yuan.(2022).Relationships between Xylem Transport, Anatomical, and Mechanical Traits at Organ Level of Two Cupressaceae Species.FORESTS,13(10).
MLA	Xie, Jiang-Bo,et al."Relationships between Xylem Transport, Anatomical, and Mechanical Traits at Organ Level of Two Cupressaceae Species".FORESTS 13.10(2022).