Grazing disturbance increases transient but decreases persistent soil seed bank

	Grazing disturbance increases transient but decreases persistent soil seed bank
	Ma, Miaojun ; Walck, Jeffrey L. ; Ma, Zhen ; Wang, Lipei ; Du, Guozhen
刊名	ECOLOGICAL APPLICATIONS
	2018-06-01
英文摘要	Very few studies have examined whether the impacts of grazing disturbance on soil seed banks occur directly or indirectly through aboveground vegetation and soil properties. The potential role of the seed bank in alpine wetland restoration is also unknown. We used SEM (structural equation modeling) to explore the direct effect of grazing disturbance on the seed bank and the indirect effect through aboveground vegetation and soil properties. We also studied the role of the seed bank on the restoration potential in wetlands with various grazing intensities: low (fenced, winter grazed only), medium (seasonally grazed), and high (whole-year grazed). For the seed bank, species richness and density per plot showed no difference among grazing intensities for each depth (0-5, 5-10, 10-15 cm) and for the whole depth (0-15 cm) in spring and summer. There was no direct effect of grazing disturbance on seed bank richness and density both in spring and summer, and also no indirect effect on the seed bank through its direct effect on vegetation richness and abundance. Grazing disturbance indirectly increased spring seed bank density but decreased summer seed bank density through its direct effect (negative correlation) on soil moisture and total nitrogen and its indirect effect on vegetation abundance. Species composition of the vegetation changed with grazing regime, but that of the seed bank did not. An increased trend of similarity between the seed bank and aboveground vegetation with increased grazing disturbance was found in the shallow depth and in the whole depth only in spring. Although there was almost no change in seed bank size with grazing intensities, grazing disturbance increased the quantity of transient seeds but decreased persistent seeds. Persistent seeds stored in the soil could play a crucial role in vegetation regeneration and in restoration of degraded wetland ecosystems. The seed bank should be an integral part of alpine wetland restoration programs.
出版者	WILEY
内容类型	期刊论文
源URL	[http://210.75.249.4/handle/363003/13812]
专题	西北高原生物研究所_中国科学院西北高原生物研究所
推荐引用方式 GB/T 7714	Ma, Miaojun,Walck, Jeffrey L.,Ma, Zhen,et al. Grazing disturbance increases transient but decreases persistent soil seed bank[J]. ECOLOGICAL APPLICATIONS,2018.
APA	Ma, Miaojun,Walck, Jeffrey L.,Ma, Zhen,Wang, Lipei,&Du, Guozhen.(2018).Grazing disturbance increases transient but decreases persistent soil seed bank.ECOLOGICAL APPLICATIONS.
MLA	Ma, Miaojun,et al."Grazing disturbance increases transient but decreases persistent soil seed bank".ECOLOGICAL APPLICATIONS (2018).