Homeostatic responses and growth of Leymus chinensis under incrementally increasing saline-alkali stress

doi:10.7717/peerj.10768

	Homeostatic responses and growth of Leymus chinensis under incrementally increasing saline-alkali stress
	Li, Shujie 1,2; Huang, Yujin 2,3; Li, Yuefen 1,2
刊名	PEERJ
	2021-03-01
卷号	9 页码:15
关键词	Saline-alkali stress Stoichiometric homeostasis Ecological stoichiometry Specific growth rate L. chinensis Nitrogen and phosphorus
ISSN号	2167-8359
DOI	10.7717/peerj.10768
通讯作者	Li, Yuefen(yfli@jlu.edu.cn)
英文摘要	Despite considerable tolerance to salt and alkali stress, Leymus chinensis populations on the southwestern Songnen Plain in northern China are threatened by increasing soil salinity and alkalinity. To explore the species' responses to saline-alkali stress, we grew it in substrates with varying concentrations of nitrogen (N) and phosphorus (P) while applying varying levels of saline-alkali stress (increasing in 14-, 17- or 23-day intervals). We measured the plants' contents of N and P, and the N:P ratio, and calculated their homeostasis indices (HN, HP and HN:P) under each nutrient and saline-alkali stress treatment. The N content was found to be more sensitive to saline-alkali stress than the P content. The N and P contents were highest and the N:P ratio was stable at pH 8.4. At both pH 8.1 and 8.4, H-N:P > H-N > H-P, but the indices and their relations differed at other pH values. Exposure to saline-alkali stress for the 14-day incremental interval had weaker effects on the plants. Rapid changes in salinity-alkalinity weakened both the positive effects of the weakly alkaline conditions (pH 7.5-8.4) and the negative effects of more strongly alkaline conditions (pH 8.7 or 9.3) on L. chinensis. When L. chinensis plants lack N, applying N fertilizer will be extremely efficient. The optimal concentrations of N and P appeared to be 16 and 1.2 mmol/L, respectively. When the L. chinensis plants were N- and P-limited, the specific growth rate correlated positively with N:P, when limited by N it correlated positively with the environmental N concentration, and when limited by P it was weakly positively correlated with the environmental P concentration.
资助项目	Science and Technology Strategy and Planning Research of Jilin Science and Technology Department[20200101119FG]
WOS关键词	ECOLOGICAL STOICHIOMETRY ; BIOLOGICAL STOICHIOMETRY ; SOIL ; PATTERNS
WOS研究方向	Science & Technology - Other Topics
语种	英语
出版者	PEERJ INC
WOS记录号	WOS:000623548300003
资助机构	Science and Technology Strategy and Planning Research of Jilin Science and Technology Department
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/160471]
专题	中国科学院地理科学与资源研究所
通讯作者	Li, Yuefen
作者单位	1.Minist Land & Resources, Key Lab Mineral Resources Evaluat Northeast Asia, Changchun, Peoples R China 2.Jilin Univ, Coll Earth Sci, Changchun, Peoples R China 3.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Beijing, Peoples R China
推荐引用方式 GB/T 7714	Li, Shujie,Huang, Yujin,Li, Yuefen. Homeostatic responses and growth of Leymus chinensis under incrementally increasing saline-alkali stress[J]. PEERJ,2021,9:15.
APA	Li, Shujie,Huang, Yujin,&Li, Yuefen.(2021).Homeostatic responses and growth of Leymus chinensis under incrementally increasing saline-alkali stress.PEERJ,9,15.
MLA	Li, Shujie,et al."Homeostatic responses and growth of Leymus chinensis under incrementally increasing saline-alkali stress".PEERJ 9(2021):15.