Experimental Exclusion of Guanaco Grazing Increases Cover, Diversity, Land Function and Plant Recruitment in Patagonia
作者机构：INTA Instituto Nacional de Tecnología AgropecuariaSanta Cruz9400Rio GallegosArgentina Universidad Nacional de la Patagonia AustralSanta Cruz9400Rio GallegosArgentina
出 版 物：《Phyton-International Journal of Experimental Botany》 (国际实验植物学杂志（英文）)
年 卷 期：2024年第93卷第7期
页 面：1383-1401页
核心收录：
学科分类：0710[理学-生物学] 071001[理学-植物学] 07[理学]
基 金：Resources for this study were obtained from INTA Projects
主 题：Rangelands herbivory biodiversity overgrazing carrying capacity fauna
摘 要：Semiarid Patagonia represents 25%of the rangeland area in Argentina,and sheep overgrazing has degraded about a third of it in the *** this century,depleted domestic stocks have mostly stabilized,but Guanaco populations have *** native camelids share habitat and diets with sheep,but their effect on vegetation is poorly understood and has long been *** set up an exclusion experiment in Monte León and Cañadón Vaca,a semiarid shrubland grassland in southern Patagonia,currently grazed only by *** baselines were studied in 2016 in twelve plots,and half of them were protected from guanaco ***-six plots were cleared to study *** was reassessed in 2021,and changes were evaluated using a paired *** protected plots,vegetation cover increased,bare soil diminished,and vegetated patches grew in size,but the density of the patch-interpatch arrangement did not ***,measured by richness and the Shan-non-Wiener(SW)index,grew signifi*** recycling increased,as did the Stability and Infiltration Land Function indexes,although these last differences were not signifi*** cover under guanaco grazing also increased,mainly due to the growth of dwarf shrubs,a typical tendency in sheep grazing-induced transitions in the *** patches under grazing fragmented,resulting in smaller patches and denser patch struc-tures,while diversity and land function indexes remained *** plants established in cleared plots without guanacos showed higher cover density and individual *** effects are similar to those observed in numerous experimental sheep *** grazing may thus prevent restoration and contribute to the generalized land degradation processes that overgrazing has been causing in Patagonia for over a century.
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