Plants alter their vertical root distribution rather than biomass allocation in response to changing precipitation

doi:10.1002/ecy.2828

	Plants alter their vertical root distribution rather than biomass allocation in response to changing precipitation
	Zhang, Bingwei 1,2; Cadotte, Marc W.; Chen, Shiping1,2 ; Tan, Xingru 1,2; You, Cuihai 1,2; Ren, Tingting 1,2; Chen, Minling 4; Wang, Shanshan 1; Li, Weijing 1; Chu, Chengjin ; Jiang, Lin 5; Bai, Yongfei1,2 ; Huang, Jianhui1,2 ; Han, Xingguo1,2
	2019
发表期刊	ECOLOGY
ISSN	0012-9658
卷号	100 期号:11
摘要	Elucidating the variation of allocation pattern of ecosystem net primary productivity (NPP) and its underlying mechanisms is critically important for understanding the changes of aboveground and belowground ecosystem functions. Under optimal partitioning theory, plants should allocate more NPP to the organ that acquires the most limiting resource, and this expectation has been widely used to explain and predict NPP allocation under changing precipitation. However, confirmatory evidence for this theory has mostly come from observed spatial variation in the relationship between precipitation and NPP allocation across ecosystems, rather than directly from the influences of changing precipitation on NPP allocation within systems. We performed a 6-yr five-level precipitation manipulation experiment in a semiarid steppe to test whether changes in NPP allocation can be explained by the optimal partitioning theory, and how water requirement of plant community is maintained if NPP allocation is unaltered. The 30 precipitation levels (5 levels x 6 yr) were divided into dry, nominal, and wet precipitation ranges, relative to historical precipitation variation over the past six decades. We found that NPP in both aboveground (ANPP) and belowground (BNPP) increased nonlinearly as precipitation increased, while the allocation of NPP to BNPP (f(BNPP)) showed a concave quadratic relationship with precipitation. The declined f(BNPP) as precipitation increased in the dry range supported the optimal partitioning theory. However, in the nominal range, NPP allocation was not influenced by the changed precipitation; instead, BNPP was distributed more in the surface soil horizon (0-10 cm) as precipitation increased, and conversely more in the deeper soil layers (10-30 cm) as precipitation decreased. This response in root foraging appears to be a strategy to satisfy plant water requirements and partially explains the stable NPP allocation patterns. Overall, our results suggest that plants can adjust their vertical BNPP distribution in response to drought stress, and that only under extreme drought does the optimal partitioning theory strictly apply, highlighting the context dependency of the adaption and growth of plants under changing precipitation.
关键词	allocation optimal biomass partitioning theory precipitation change semiarid steppe species reordering vertical root distribution
学科领域	Ecology
DOI	10.1002/ecy.2828
收录类别	SCI
语种	英语
WOS关键词	NET PRIMARY PRODUCTIVITY ; RAIN-USE EFFICIENCY ; GRASSLAND ; VARIABILITY ; ECOSYSTEMS ; SENSITIVITY ; LIMITATION ; DYNAMICS ; PATTERNS ; MONGOLIA
WOS研究方向	Environmental Sciences & Ecology
WOS记录号	WOS:000481255900001
出版者	WILEY
文献子类	Article
出版地	HOBOKEN
EISSN	1939-9170
资助机构	National Key R&D Program of China [2017YFA0604801, 2016YFC0500700, 2016YFC0500103] ; National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [41773084, 31700375]
作者邮箱	spchen@ibcas.ac.cn
引用统计	被引频次：81[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.ibcas.ac.cn/handle/2S10CLM1/19591
专题	植被与环境变化国家重点实验室
作者单位	1.Sun Yat Sen Univ, Sch Life Sci, Dept Ecol, State Key Lab Biocontrol, Guangzhou 510275, Guangdong, Peoples R China 2.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing 100093, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 4.Cadotte, Marc W.] Univ Toronto Scarborough, Dept Biol Sci, Toronto, ON M1C 1A4, Canada 5.Jinan Univ, Coll Chinese Language & Culture, Guangzhou 510610, Guangdong, Peoples R China 6.Georgia Inst Technol, Sch Biol Sci, Atlanta, GA 30332 USA
推荐引用方式 GB/T 7714	Zhang, Bingwei,Cadotte, Marc W.,Chen, Shiping,et al. Plants alter their vertical root distribution rather than biomass allocation in response to changing precipitation[J]. ECOLOGY,2019,100(11).
APA	Zhang, Bingwei.,Cadotte, Marc W..,Chen, Shiping.,Tan, Xingru.,You, Cuihai.,...&Han, Xingguo.(2019).Plants alter their vertical root distribution rather than biomass allocation in response to changing precipitation.ECOLOGY,100(11).
MLA	Zhang, Bingwei,et al."Plants alter their vertical root distribution rather than biomass allocation in response to changing precipitation".ECOLOGY 100.11(2019).

条目包含的文件
文件名称/大小	文献类型	版本类型	开放类型	使用许可
Ecology - 2019 - Zha（2625KB）	期刊论文	出版稿	开放获取	CC BY-NC-SA	浏览请求全文