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1. Using CA-Markov Models to Simulate the Land-use Changes in Pudong New Area, Shanghai City | |||
Xie Yi,Ma Weichun,Zhang Hao,Chen Weizhen,Chen Mingnan,Zhou Liguo | |||
Environmental Science and Techology 15 January 2014 | |||
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Abstract:In recent years, much attention has been paid to land-use change simulations for the sake of better displaying the mechanism of land-use change and making out relevant policies. While CA-Markov model is a robust approach in spatial and temporal dynamic modeling of land use/cover changes because geographic information system (GIS) and remote-sensing data can be efficiently incorporated. In this paper, geographical environment factors as well as social-economic factors are combined with land-use current situation data over the past one decade to simulate the future land use patterns of Pudong New Area, Shanghai city. As a newly well-developed district in Shanghai, Pudong New Area is experiencing an increase in both population and built-up areas, which intensify the contradictions of all kinds of land use. CA-Markov model is introduced to simulate the land use changes of the city. After determined the parameter, transformation rules and correcting process of the model, it is applied to the simulation and prediction of Pudong New Area. The good simulation results demonstrate the feasibility of our model, which can reflect the characteristics of the Land use Policy in past years, and guarantee appropriate deployment of the urban land. Moreover, we further used the established CA-Markov model to simulate the land use situation in 2012 and 2018, and therefore provide a reference and solution to sustainable development in the study area. | |||
TO cite this article:Xie Yi,Ma Weichun,Zhang Hao, et al. Using CA-Markov Models to Simulate the Land-use Changes in Pudong New Area, Shanghai City[OL].[15 January 2014] http://en.paper.edu.cn/en_releasepaper/content/4582182 |
2. Research of the phosphorus types and releasing rates from the water-sediment interface of Shanzi deep reservoir in Fujian Province | |||
Su Yuping,Lin wangzhen,Linjia,ZHONG Hou-zhang,Chen Youzhen | |||
Environmental Science and Techology 09 October 2009 | |||
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Abstract:The SMT methods were used for the extraction of phosphorus species in the surface sediments of the Shanzi reservoir in Fujian province in 2005.The results showed that the concentrations of total phosphorus in surface sediment ranged from 641mg/kg to 1068 mg/kg and the concentrations gradually increase from the Riverine Zone to Transition Zone and Lacustrine Zone. The content of total phosphorus decreases vertically from the surface sediment. while the aluminium/Iron bounded phosphorus and the organic phosphorus were the preponderant forms in the sediment, which opplied about 70%~85% of the total phosphorus concentration. The high sedimentary phosphorus is a potential source of dissolved phosphorus to the overlying water and the exchange potentials of phosphates at the water–sediment interface were investigated by the sediment sampling from four sections area. The capacity of releasing soluble phosphorus from the sediment is Lacustrine Zone larger then Transition Zone and the Riverine Zone. The low release rate of soluble phosphorus is due to the existing environmental conditions in the river. If condition such as DO changed, the release rate could increase by as much as 5-6 times, which could reach to 10.66 mg•m-2•d-1.The sediment phosphorus load would be an important factor of the trophic status of the reservoir if the outside sources had been reduced. | |||
TO cite this article:Su Yuping,Lin wangzhen,Linjia, et al. Research of the phosphorus types and releasing rates from the water-sediment interface of Shanzi deep reservoir in Fujian Province[OL].[ 9 October 2009] http://en.paper.edu.cn/en_releasepaper/content/35695 |
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