Arid
DOI10.1016/j.ecolind.2018.06.032
Coupling structural and functional thresholds for vegetation changes on a Mongolian shrubland
Sasaki, Takehiro1; Koyama, Asuka2; Okuro, Toshiya2
通讯作者Sasaki, Takehiro
来源期刊ECOLOGICAL INDICATORS
ISSN1470-160X
EISSN1872-7034
出版年2018
卷号93页码:1264-1275
英文摘要

The concept of an ecological threshold has spurred important advances in understanding the nonlinear responses of ecosystems to various disturbances. Yet integrated evaluations of an ecosystem’s structural threshold and functional threshold are rare, and we know little about linkages between observed nonlinear changes in ecosystem structure along disturbance gradients and the associated changes in system feedbacks. We applied a two-step approach to perform integrated evaluations of structural and functional thresholds in a Mongolian shrub land. First, by using 6 years of data from plant communities along a gradient of grazing intensity, we identified the structural threshold in the changes in shrub cover along the gradient. We then identified the functional threshold at which wind erosion rates were accelerated due to sufficient decline in shrub cover. We found that shrub cover changed abruptly along the grazing gradient, indicating the presence of a structural threshold. Shrub cover decreased gradually along the grazing gradient to the threshold of 6.9%; thereafter it decreased rapidly. This level of shrub cover was close to that of the functional threshold (5.3%), namely the point at which the rate of wind erosion was accelerated. Our key finding is the coupling of structural and functional thresholds, suggesting that the modification of feedbacks between wind erosion and shrub cover might be associated with the nonlinear response of ecosystem structure to grazing. To bridge the gap between management applications and ecological threshold theory, it is essential to understand the potential feedback mechanisms that would contribute to nonlinear changes in ecosystem structure.


英文关键词Arid and semi-arid rangelands Caragana microphylla Ecological threshold Mongolia Piecewise linear model Positive feedback Wind erosion
类型Article
语种英语
国家Japan
收录类别SCI-E
WOS记录号WOS:000452692600124
WOS关键词ECOLOGICAL THRESHOLDS ; ECOSYSTEM MANAGEMENT ; ALTERNATIVE STATES ; GRAZING GRADIENTS ; REGIME SHIFTS ; RESILIENCE ; EROSION ; SOIL ; PRODUCTIVITY ; INTENSITY
WOS类目Biodiversity Conservation ; Environmental Sciences
WOS研究方向Biodiversity & Conservation ; Environmental Sciences & Ecology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/208742
作者单位1.Yokohama Natl Univ, Grad Sch Environm & Informat Sci, 79-7 Tokiwadai, Yokohama, Kanagawa 2408501, Japan;
2.Univ Tokyo, Grad Sch Agr & Life Sci, Bunkyo Ku, 1-1-1 Yayoi, Tokyo 1138657, Japan
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GB/T 7714
Sasaki, Takehiro,Koyama, Asuka,Okuro, Toshiya. Coupling structural and functional thresholds for vegetation changes on a Mongolian shrubland[J],2018,93:1264-1275.
APA Sasaki, Takehiro,Koyama, Asuka,&Okuro, Toshiya.(2018).Coupling structural and functional thresholds for vegetation changes on a Mongolian shrubland.ECOLOGICAL INDICATORS,93,1264-1275.
MLA Sasaki, Takehiro,et al."Coupling structural and functional thresholds for vegetation changes on a Mongolian shrubland".ECOLOGICAL INDICATORS 93(2018):1264-1275.
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