干旱区生态环境知识资源中心(Arid): The effects of different management interventions on degraded rangelands in Iceland

Arid

DOI	10.1002/ldr.4057
	The effects of different management interventions on degraded rangelands in Iceland
	Mulloy, Tara A.; Barrio, Isabel C.; Jonsdottir, Ingibjorg S.; Hik, David S.
通讯作者	Mulloy, TA (corresponding author), Simon Fraser Univ, Dept Biol Sci, 8888 Univ Dr, Burnaby, BC V5A 1S6, Canada.
来源期刊	LAND DEGRADATION & DEVELOPMENT
ISSN	1085-3278
EISSN	1099-145X
出版年	2021
英文摘要	Loss of vegetation and soil erosion are symptoms of widespread rangeland degradation across most of the Icelandic highlands. Areas at different stages of degradation coexist as a mosaic that includes both vegetated heathlands, and exposed gravelly deserts. Revegetation efforts have included fertilizer applications and grazing exclusion to increase plant biomass and reduce bare ground, but their effectiveness is predicted to differ depending on the stage of degradation for a certain area. In this study, we used a 4-year field experiment to test the predictions of a state-and-transition model for the Icelandic highlands. We measured the combined effects of grazing exclusion and factorial applications of nitrogen (N), phosphorus (P), and potassium (K) fertilizers, on plant biomass, species richness, amount of exposed bare ground and plant community composition in a dwarf-shrub heathland and a gravelly desert habitat. After 4 years: (1) grazing exclusion alone had no effect in either habitat; (2) fertilizers increased biomass in both habitats, especially in plots treated with NP or NK; (3) the combination of fertilizers and grazing exclusion produced the greatest amount of aboveground biomass, predominantly of forb and graminoid species. In the dwarf-shrub heath, the increase in biomass in fertilized and fenced plots also corresponded to a loss in species richness, whereas in the gravelly desert, increased biomass reduced the amount of bare ground without reducing species richness. Our results reinforce the importance in understanding the effects of different management interventions across ecological conditions to determine the most effective revegetation approach.
英文关键词	fertilization grazing exclusion highlands land degradation nutrient co-limitation
类型	Article ; Early Access
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000685679300001
WOS关键词	ARCTIC TUNDRA ; TRANSITION MODELS ; SPECIES RICHNESS ; NUTRIENT ; STATE ; RESPONSES ; RESTORATION ; RECLAMATION ; VEGETATION ; LIGHT
WOS类目	Environmental Sciences ; Soil Science
WOS研究方向	Environmental Sciences & Ecology ; Agriculture
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/364106
作者单位	[Mulloy, Tara A.; Hik, David S.] Simon Fraser Univ, Dept Biol Sci, 8888 Univ Dr, Burnaby, BC V5A 1S6, Canada; [Mulloy, Tara A.; Barrio, Isabel C.] Agr Univ Iceland, Fac Environm & Forest Sci, Reykjavik, Iceland; [Jonsdottir, Ingibjorg S.] Univ Iceland, Inst Life & Environm Sci, Reykjavik, Iceland
推荐引用方式 GB/T 7714	Mulloy, Tara A.,Barrio, Isabel C.,Jonsdottir, Ingibjorg S.,et al. The effects of different management interventions on degraded rangelands in Iceland[J],2021.
APA	Mulloy, Tara A.,Barrio, Isabel C.,Jonsdottir, Ingibjorg S.,&Hik, David S..(2021).The effects of different management interventions on degraded rangelands in Iceland.LAND DEGRADATION & DEVELOPMENT.
MLA	Mulloy, Tara A.,et al."The effects of different management interventions on degraded rangelands in Iceland".LAND DEGRADATION & DEVELOPMENT (2021).