DOI: 10.1002/jgrd.50573
论文题名: Spatiotemporal variation in the microclimatic edge effect between wetland and farmland
作者: Liao X. ; Liu Z. ; Wang Y. ; Jin J.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 14 起始页码: 7640
结束页码: 7650
语种: 英语
英文关键词: air temperature
; edge effect
; farmland
; sigmoid gradients
; specific humidity
; Wetland microclimate
Scopus关键词: Atmospheric temperature
; Ecology
; Wetlands
; Air temperature
; Edge effect
; farmland
; sigmoid gradients
; Specific humidity
; Farms
; agricultural land
; air temperature
; anthropogenic effect
; biodegradation
; disturbance
; edge effect
; fragmentation
; landscape
; microclimate
; numerical model
; relative humidity
; spatiotemporal analysis
; wetland
; China
; Heilongjiang
; Sanjiang Nature Reserve
英文摘要: The creation of wetland edges associated with anthropogenic fragmentation is common in wetland landscapes and brings about a unique microclimatic change that affects adjacent farmland. However, microclimatic edge effects within this kind of landscape are not well quantified. Thus, using a study site located in the northeastern Sanjiang National Nature Reserve, China, we investigated the spatiotemporal variations in the microclimatic variables of the surface layer across the wetland-farmland edge. Air temperature and relative humidity data were collected continuously along a horizontal transect at four different heights over different periods, and the relative humidity was converted to specific humidity. Sigmoid models were used to fit the horizontal gradients of microclimatic edge effects. Then, based on the parameters in the fitted models, the characteristics of the edge effects were quantified with two indices, the magnitude of edge effect (MEE) and the spatial range of edge effect (REE). Under a light wind condition, the microclimatic features across the edge generally presented sigmoid ecological gradients in the horizontal direction, with unique spatial and temporal patterns: (1) In a normal year, wetland patches cooled and moistened the adjacent farmlands during the daytime and had a warming-moistening effect during the nighttime. (2) Vertically, the absolute MEE value of the microclimatic variables decreased, but the REE increased with increasing height. (3) The MEE and REE for air temperature and specific humidity varied with the time of day, both shifting at dawn and dusk when the gradients were absent. (4) At the interannual scale, when compared to the farmland, the wetland was cooler at night in a dry year but warmer in a normal year. The detection of spatiotemporal microclimatic patterns in the wetland-farmland edge zone may enable further understanding of how wetland degradation affects adjacent farmland ecology under human disturbance and promote better management and restoration of fragmented wetlands. Key Points Air temperature and humidity showed sigmoid gradients across the wetland edges. The magnitude of edge effect decreased but the extent increased with height. The edge effect pattern regularly varied with the time of day. ©2013. American Geophysical Union. All Rights Reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63547
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Northeast Institute of Geography and Agricultural Ecology, Chinese Academy of Sciences, Shengbei Road 4888, Changchun 130102, China; Northeast Institute of Geography and Agricultural Ecology, University of Chinese Academy of Sciences, Beijing, China; Department of Watershed Sciences, Utah State University, Logan UT, United States
Recommended Citation:
Liao X.,Liu Z.,Wang Y.,et al. Spatiotemporal variation in the microclimatic edge effect between wetland and farmland[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(14)