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Adsorption and Desorption of Ammonium in Wetland Soils Subject to Freeze-Thaw Cycles

Pedosphere 2011年第2期21卷 251-258页

作者： YU Xiao-Fei ZHANG Yu-Xia ZOU Yuan-Chun ZHAO Hong-Mei LU Xian-Guo WANG Guo-Ping Northeast Institute of Geography and Agroecology Chinese Academy of Sciences Changehun 130012 (China) Graduate University of Chinese Academy of Sciences Beijing 100049 (China)

Nitrogen （N） cycling in boreal peatland ecosystems may be influenced in important ways by freeze-thaw cycles （FTCs）. Adsorption and desorption of ammonium ions （NH4＋） were examined in a controlled laboratory experiment for soils sampled from palustrine wetland, riverine wetland, and farmland reclaimed from natural wetland in response to the number of FTCs. The results indicate that freeze-thaw significantly increased the adsorption capacity of NH： and reduced the desorption potential of NH4＋ in the wetland soils. There were significant differences in the NH4＋ adsorption amount between the soils with and without freeze-thaw treatment. The adsorption amount of NH4＋ increased with increasing FTCs. The palustrine wetland soil had a greater adsorption capacity and a weaker desorption potential of NH4＋ than the riverine wetland soil because of the significantly higher clay content and cation exchange capacity （CEC） of the riverine wetland soil. Because of the altered soil physical and chemical properties and hydroperiods, the adsorption capacity of NH4＋ was smaller in the farmland soil than in the wetland soils, while the desorption potential of the farmland soil was higher than that of the wetland soils. Thus, wetland reclamation would decrease adsorption capacity and increase desorption potential of NH4＋, which could result in N loss from the farmland soil. FTCs might mitigate N loss from soils and reduce the risk of water pollution in downstream ecosystems.

关键词： cation exchange capacity clay content farmland hydroperiod N loss

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Persistence of herpetofauna in the urbanized rouge river ecosystem

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Open Journal of Ecology 2013年第3期3卷 234-241页

作者： David A. Mifsud John C. Thomas 1Natural Sciences Department University of Michigan-Dearborn Dearborn USA 2Herpetological Resource and Management Chelsea USA Natural Sciences Department University of Michigan-Dearborn Dearborn USA

Over 100 years, urbanization has taken place along the Rouge River watershed of southeast Michigan, USA. To determine the impact(s) of urbanization on herpetofauna, species richness and distribution in 122 wetlands along 13.0 km of the urbanized Rouge River watershed were monitored from early spring to late fall 2003. Data were mapped using Geographic Information Systems (GIS). Both amphibian and reptile species richness were associated with wetland size and hydroperiod. The invasive plants Alliaria petiolata and Rhamnus cathartica were coincident with lower than average amphibian species richness. In spite of the number of herpetofauna being relatively low, this study identified hydroperiod and wetland size as important features that may contribute to amphibian and reptile species sustainability in this highly disturbed and fragmented urban landscape.

关键词： Amphibian hydroperiod Invasive Plants Reptiles Wetland Urban Herpetology

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