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The biogeographical distribution of tree species-abundance and its relation to climatic factors in mass islands

Acta Oceanologica Sinica 2017年第9期36卷 87-90页

作者： LI Xiaoming WU Chengzhen GU Wu YE Ran ZHANG Haibo QI Ping WANG Shengqiang ZHOU Siying WEI Yongjie CAI Yanhong State Oceanic Administration Beijing 100860 China Wuyi University Wuyishan 354300 China Marine Environmental Monitoring Center of Ningbo Ningbo 315012 China Marine Environmental Monitoring Center of Tianjin Tianjin 300450 China

Tree species-abundance in forests is a function of geographical area and climate, although it is not clear whether such relationships apply to mass islands. We examined the spatial pattern of tree species in mass islands along the coast of Zhejiang, East China Sea using the Preston model, to identify the relationships between tree communities and climatic conditions. The results show that：（1） the biogeographical distribution of tree species-abundance conformes to Preston＇s log-normal pattern, and is in accordance with the findings in both tropical rainforests and estuarine forests;（2） the climatic factors related to tree communities in mass islands are similar to that of the subtropical zone, including the major species of evergreen needle-leaf, broad-leaf and deciduous broad-leaf forests. We conclude that the Preston model can be applied to the trees of mass islands and thus facilitate the systematic ecological researches of vegetation species＇ composition in subtropical zone.

关键词： mass islands species-abundance spatial pattern log-normal model

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modeling aggregate size distribution of eroded sediment resulting from rain-splash and raindrop impacted flow processes

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International Journal of Sediment Research 2019年第2期34卷 166-177页

作者： Selen Deviren Saygin Gunay Erpul Department of Soil Science and Plant Nutrition Faculty of AgricultureUniversity of Ankara

Soil susceptibility to detachment and transport sub-processes of erosion is generally controled by the aggregate breakdown *** particle size and aggregation to the estimate erodibility potential of soils is important under erosive rainfall *** Aggregate Size Distribution（ASD）is one of the most important determinants of soil structure along with soil organic matter content for describing the efficiency of applied,sustainable management *** study aimed to compare the performances of three different aggregate size distribution models to predict the characteristic aggregate size parameter(median diameter,D50)for eroded sediment from interrill erosion processes of RainSplash Transport（RST）and Raindrop Impacted Flow Transport（RIFT）.The ASDs of 1143 collected sediment samples from the RST and RIFT processes were measured and modeled by the log-normal,Fractal,and Weibull *** D50value,as a characteristic parameter for aggregate size distributions,derived from the cumulative ASD curve was compared for soils from different land use types and different slope and rainfall intensity *** performance of each model was evaluated using the Mean Square Error（MSE）and Coefficient of Determination（R2）.The Weibull approach was the most accurate model showing the best fit with the lowest MSE values（0.0002≤MSE≤0.0048）and having the greatest R2values（0.936≤R2≤0.998）when compared with the log-normal and Fractal ***,for semi-arid land use and soil,specific shape and scale parameters for the Weibull distribution,the respective ASDs were successfully re-generated for modeling the eroded sediment of the simulated RST and RIFT interill processes.

关键词： Aggregate size distribution Eroded sediment log-normal model Fractal model Weibull model

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