Arid
DOI10.1016/j.jenvman.2017.04.086
Reductions of plant cover induced by sheep grazing change the above-belowground partition and chemistry of organic C stocks in arid rangelands of Patagonian Monte, Argentina
Larreguy, C.1; Carrera, A. L.1,2; Bertiller, M. B.1,2
通讯作者Larreguy, C.
来源期刊JOURNAL OF ENVIRONMENTAL MANAGEMENT
ISSN0301-4797
EISSN1095-8630
出版年2017
卷号199页码:139-147
英文摘要

The objective of this study was to estimate the size and chemical quality of the total organic C stock and its partition between above-belowground plant parts and soil at sites with different plant cover induced by sheep grazing in the arid Patagonian Monte. This study was conducted at six representative sites with increasing signs of canopy disturbance attributed to grazing pressure. We used faeces density as a proxy of grazing pressure at each site. We assessed the total plant cover, shrub and perennial grass cover, total standing aboveground biomass (AGB), litter mass and belowground biomass (BGB) at each site. We further estimated the content of organic C, lignin and soluble phenols in plant compartments and the content of organic C, organic C in humic substances (recalcitrant C) and water soluble C (labile C) in soil at each site. Total plant cover was significantly related to grazing pressure. Standing AGB and litter mass decreased with increasing canopy disturbance while BGB did not vary across sites. Total organic C stock and the organic C stock in standing AGB increased with increasing total plant, shrub, and perennial grass cover. The organic C stock in litter mass increased with increasing total plant and shrub cover, while the organic C stock in BGB did not vary across sites. Lignin content in plant compartments increased with increasing total and shrub cover, while soluble phenols content did not change across sites. The organic C stock and the water soluble C content in soil were positively associated with perennial grass cover. Changes in total plant cover induced by grazing pressure negatively affected the size of the total organic C stock, having minor impact on the size of belowground than aboveground components. The reduction of perennial grass cover was reflected in decreasing chemical quality of the organic C stock in soil. Accordingly, plant managerial strategies should not only be focused on the amount of organic C sequestered but also on the chemical quality of organic C stocks since C chemistry could have an important impact on ecosystem functioning. (C) 2017 Elsevier Ltd. All rights reserved.


英文关键词Arid ecosystems C chemistry Grazing disturbance Organic C stocks perennial grass Water soluble C
类型Article
语种英语
国家Argentina
收录类别SCI-E
WOS记录号WOS:000403736000015
WOS关键词SOIL MICROBIAL ACTIVITY ; CARBON SEQUESTRATION ; NORTHERN PATAGONIA ; RECOVERY PROCESSES ; GRAZED SHRUBLANDS ; FUNCTIONAL TRAITS ; INNER-MONGOLIA ; ROOT BIOMASS ; LAND-USE ; MATTER
WOS类目Environmental Sciences
WOS研究方向Environmental Sciences & Ecology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/200360
作者单位1.Consejo Nacl Invest Cient & Tecn, CCT CENPAT, Inst Patagon Estudio Ecosistemas Continentales, Blvd Brown 2915, RA-9120 Puerto Madryn, Chubut, Argentina;
2.UNPSJB, Fac Ciencias Nat, Blvd Brown 3000, RA-9120 Puerto Madryn, Chubut, Argentina
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GB/T 7714
Larreguy, C.,Carrera, A. L.,Bertiller, M. B.. Reductions of plant cover induced by sheep grazing change the above-belowground partition and chemistry of organic C stocks in arid rangelands of Patagonian Monte, Argentina[J],2017,199:139-147.
APA Larreguy, C.,Carrera, A. L.,&Bertiller, M. B..(2017).Reductions of plant cover induced by sheep grazing change the above-belowground partition and chemistry of organic C stocks in arid rangelands of Patagonian Monte, Argentina.JOURNAL OF ENVIRONMENTAL MANAGEMENT,199,139-147.
MLA Larreguy, C.,et al."Reductions of plant cover induced by sheep grazing change the above-belowground partition and chemistry of organic C stocks in arid rangelands of Patagonian Monte, Argentina".JOURNAL OF ENVIRONMENTAL MANAGEMENT 199(2017):139-147.
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