Nutrient reallocation between stem and leaf drives grazed grassland degradation in inner Mongolia, China

doi:10.1186/s12870-022-03875-4

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	Nutrient reallocation between stem and leaf drives grazed grassland degradation in inner Mongolia, China
	Liu, Jiayue 3; Lu, Shuaizhi 2; Liu, Changcheng 2; Hou, Dongjie 1
刊名	BMC PLANT BIOLOGY
	2022
卷号	22 期号:1
关键词	Grazing Macroelements Microelements Nutrient reallocation Steppe
ISSN号	1471-2229
DOI	10.1186/s12870-022-03875-4
文献子类	Article
英文摘要	Background Decline in height and aboveground biomass of the plant community are critical indicators of grassland ecosystem degradation. Nutrient reallocation induced by grazing occurs among different organs, which balances the trade-off between growth and defense. However, it is not yet clear how nutrient reallocation strategies affect plant community structure and functions in grazed grasslands. A grazing experiment was conducted in a typical steppe in Inner Mongolia, China. We investigated plant community characteristics and measured plant functional traits of dominant species (Leymus chinensis and Cleistogenes squarrosa) at individual and population levels. Carbon (C), nitrogen (N), phosphorus (P), copper (Cu), iron (Fe), manganese (Mn), and zinc (Zn) concentrations of stem and leaf in the two species were also determined. Results N, P, Cu, Fe, Mn, and Zn concentrations in leaves and stems of L. chinensis and C. squarrosa significantly increased with grazing intensity, and microelements (Cu, Fe, Mn, and Zn) were more sensitive to grazing. The nutrient slopes of macro- and microelements in leaves were significantly higher than those in stems under grazing, indicating that nutrient resources were preferentially allocated to leaves and enhanced the compensatory growth of leaves in the grazed grassland. With increasing grazing intensity, the aboveground biomass of stems and leaves in the two species significantly decreased, but leaf to stem ratio increased at the individual level, indicating that plants preferentially allocated biomass to leaves under grazing. The increase in leaf to stem ratio due to nutrient reallocation between the two organs significantly reduced height and aboveground biomass at population and community levels, driving grassland ecosystem degradation. Conclusion Our study revealed the driving forces of community structure and function degradation in grazed grasslands from the perspective of nutrient resource allocation, and provided insights into plant adaptation strategies to grazing.
学科主题	Plant Sciences
出版地	LONDON
WOS关键词	LEYMUS-CHINENSIS ; FUNCTIONAL DIVERSITY ; SEMIARID GRASSLAND ; STRATEGIES ; MANAGEMENT ; RESPONSES ; WATER ; ZN ; FE ; CU
WOS研究方向	Science Citation Index Expanded (SCI-EXPANDED)
语种	英语
出版者	BMC
WOS记录号	WOS:000876309300001
资助机构	Inner Mongolia Agricultural University high-level talents research launch project [NDYB2020-2] ; Major Program of National Natural Science Foundation of China [32192463] ; Scientific and Technological Transformative Project in Inner Mongolia Autonomous Region [2020CG0013]
内容类型	期刊论文
源URL	[http://ir.ibcas.ac.cn/handle/2S10CLM1/28831]
专题	植被与环境变化国家重点实验室
作者单位	1.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing 100093, Peoples R China 2.Inner Mongolia Univ, Sch Ecol & Environm, Inner Mongolia Key Lab Grassland Ecol, Hohhot 010021, Peoples R China 3.Inner Mongolia Univ, Sch Ecol & Environm, Minist Educ, Key Lab Ecol & Resource Use Mongolian Plateau, Hohhot 010021, Peoples R China 4.Inner Mongolia Agr Univ, Coll Grassland Resource & Environm, Hohhot 010019, Peoples R China
推荐引用方式 GB/T 7714	Liu, Jiayue,Lu, Shuaizhi,Liu, Changcheng,et al. Nutrient reallocation between stem and leaf drives grazed grassland degradation in inner Mongolia, China[J]. BMC PLANT BIOLOGY,2022,22(1).
APA	Liu, Jiayue,Lu, Shuaizhi,Liu, Changcheng,&Hou, Dongjie.(2022).Nutrient reallocation between stem and leaf drives grazed grassland degradation in inner Mongolia, China.BMC PLANT BIOLOGY,22(1).
MLA	Liu, Jiayue,et al."Nutrient reallocation between stem and leaf drives grazed grassland degradation in inner Mongolia, China".BMC PLANT BIOLOGY 22.1(2022).