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	Fast-cycling unit of root turnover in perennial herbaceous plants in a cold temperate ecosystem
	Sun K.; Mccormack, M. L.; Li, L.; Ma, Z. Q.; Guo, D. L.
	2016
关键词	life-span branch order fine roots nutrient availability fraxinus-mandshurica forest leaf carbon respiration longevity
英文摘要	Roots of perennial plants have both persistent portion and fast-cycling units represented by different levels of branching. In woody species, the distal nonwoody branch orders as a unit are born and die together relatively rapidly (within 1-2 years). However, whether the fast-cycling units also exist in perennial herbs is unknown. We monitored root demography of seven perennial herbs over two years in a cold temperate ecosystem and we classified the largest roots on the root collar or rhizome as basal roots, and associated finer laterals as secondary, tertiary and quaternary roots. Parallel to woody plants in which distal root orders form a fast-cycling module, basal root and its finer laterals also represent a fast-cycling module in herbaceous plants. Within this module, basal roots had a lifespan of 0.5-2 years and represented 62-87% of total root biomass, thus dominating annual root turnover (60%-81% of the total). Moreover, root traits including root length, tissue density, and biomass were useful predictors of root lifespan. We conclude that both herbaceous and woody plants have fast-cycling modular units and future studies identifying the fast-cycling module across plant species should allow better understanding of how root construction and turnover are linked to whole-plant strategies.
出处	Scientific Reports
卷	6
语种	英语
ISSN号	2045-2322
DOI标识	10.1038/srep19698
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/42789]
专题	地理科学与资源研究所_历年回溯文献
推荐引用方式 GB/T 7714	Sun K.,Mccormack, M. L.,Li, L.,et al. Fast-cycling unit of root turnover in perennial herbaceous plants in a cold temperate ecosystem. 2016.

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