期刊
JOURNAL OF ARID ENVIRONMENTS
卷 129, 期 -, 页码 111-118出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jaridenv.2016.02.014
关键词
Carbon cycling; Shrub encroachment; Biogeochemical cycling; Prosopis; Nutrient cycling; Photodegradation
资金
- T E Inc.
- Native Plant Society of New Mexico Otero County Chapter
- New Mexico State University Biology Graduate Student Organization
- US National Science Foundation [DEB-0815808]
- USDA
- National Science Foundation [DEB-1235828, DEB-0618210]
- Direct For Biological Sciences
- Division Of Environmental Biology [1235828] Funding Source: National Science Foundation
Shrub encroachment, a common occurrence in drylands over the past 150 years, has the potential to alter the redistribution of soil and soil resources by wind and water. This may affect decomposition via soil litter mixing (SLM). SLM can accelerate decomposition, but its contributions and relationship with abiotic controls, particularly in the context of shrub encroachment, are unknown. To better understand the spatiotemporal relationships between decomposition and shrub encroachment, we conducted a 24 month decomposition study aimed at understanding how placement of litter on either up or downwind sides of dunes in association dune volume affected litter decomposition. There was little decomposition in the first six months of the experiment, with 97.2% of mass remaining despite high exposure to solar radiation. Decay occurred in synchrony with monsoons and SLM, suggesting precipitation during the monsoon season plays an important role in facilitating both SLM and decomposition. Litter placements across a gradient of shrub volumes had no effect on decomposition rates and SLM, but litter placement on the downwind side of dunes had a positive influence on soil-microbial film development. Ultimately, monsoons rainfall and SLM promoted decomposition across a gradient of shrub encroachment in this dryland ecosystem. (C) 2016 Elsevier Ltd. All rights reserved.
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