干旱区生态环境知识资源中心(Arid): Enzyme and osmotic adjustment compounds of key species can help explain shrub encroachment in a semiarid sandy grassland

Arid

DOI	10.1016/j.ecolind.2019.01.044
	Enzyme and osmotic adjustment compounds of key species can help explain shrub encroachment in a semiarid sandy grassland
	Yang, Liu 1,2; Lai, Liming 1; Zhou, Jihua 1; Yi, Sangui 1,2; Sun, Qinglin 1,2; Li, Heyi 1,2; Jiang, Lianhe 1; Zheng, Yuanrun 1
通讯作者	Zheng, Yuanrun
来源期刊	ECOLOGICAL INDICATORS
ISSN	1470-160X
EISSN	1872-7034
出版年	2019
卷号	101 页码:541-551
英文摘要	Rationale: In arid and semiarid grasslands where shrub encroachment usually occurs, water plays an important role and might control the process of shrub encroachment. Understanding how species adapt to different sandy environments can help explain the shrub encroachment process. Central methods: Four different grades of shrub encroached grasslands were selected as follows: the Agriophyllum squarrosum community in shifting sandy land (SA), the Artemisia ordosica community in semifixed sandy land (SFA), the A. ordosica community in fixed sandy land (FA) and the Stipa bungeana community in fixed sandy land (FS), which are located on the Ordos Plateau (China) and were selected to analyze the dynamics of enzyme and osmotic adjustment compounds of species in different stages of shrub encroachment. Key results: The results showed that from the community in shifting sandy land to the community in fixed sandy land, the average enzyme activities of species decreased and then increased; the malondialdehyde content increased, and the osmotic adjustment compounds increased (or increased and then decreased). The enzyme activities of grasses were significantly higher than those of shrubs. However, there were no significant differences in the malondialdehyde contents of grasses and shrubs. The proline and soluble protein contents of shrubs were significantly higher than those of grasses. The soluble sugar content of grasses was significantly higher than those of shrubs. The D values indicated that the drought resistance of the five species decreased as follows: S. bungeana in FS > S. bungeana in FA > Caragana korshinskii in FA > C. korshinskii in FS > A. ordosica in FS > A. squarrosum in SA > Artemisia sphaerocephala in SFA > A. sphaerocephala in SA > A. ordosica in FA > A. ordosica in SFA. Main conclusions: The results suggest that the five dominant species in different shrub encroachment stages could enhance their drought resistance by upregulating the antioxidant system and osmotic adjustment in response to drought stress. S. bungeana had a higher drought resistance. For different plant functions, grass had a higher drought resistance than shrubs. It is concluded that S. bungeana can adapt to a drier environment; when the surface soil layer becomes dry, S. bungeana communities developed well due to its high drought ability. Compared to A. ordosica, the S. bungeana community can be a dominant community when human disturbance decreased in the Ordos Plateau.
英文关键词	Ordos Plateau Sandy environment Drought resistance Antioxidant enzyme system Osmotic adjustment
类型	Article
语种	英语
国家	Peoples R China
收录类别	SCI-E
WOS记录号	WOS:000470963300055
WOS关键词	WOODY PLANT ENCROACHMENT ; OXIDATIVE STRESS ; DROUGHT STRESS ; RESPONSES ; COMMUNITIES ; MECHANISMS ; TOLERANCE ; SAVANNA ; IMPACTS ; DAMAGE
WOS类目	Biodiversity Conservation ; Environmental Sciences
WOS研究方向	Biodiversity & Conservation ; Environmental Sciences & Ecology
来源机构	中国科学院植物研究所
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/215205
作者单位	1.Chinese Acad Sci, Inst Bot, West China Subalpine Bot Garden, Key Lab Resource Plants, Beijing 100093, Peoples R China; 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Yang, Liu,Lai, Liming,Zhou, Jihua,et al. Enzyme and osmotic adjustment compounds of key species can help explain shrub encroachment in a semiarid sandy grassland[J]. 中国科学院植物研究所,2019,101:541-551.
APA	Yang, Liu.,Lai, Liming.,Zhou, Jihua.,Yi, Sangui.,Sun, Qinglin.,...&Zheng, Yuanrun.(2019).Enzyme and osmotic adjustment compounds of key species can help explain shrub encroachment in a semiarid sandy grassland.ECOLOGICAL INDICATORS,101,541-551.
MLA	Yang, Liu,et al."Enzyme and osmotic adjustment compounds of key species can help explain shrub encroachment in a semiarid sandy grassland".ECOLOGICAL INDICATORS 101(2019):541-551.