Climate Change and Dryland Agricultural Ecosystem Management
Climate Change and Dryland Agricultural Ecosystem Management
Climate Change and Dryland Agricultural Ecosystem Management
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Research on total phosphorus removal from sewage by subsurface<br />
flow constructed wetl<strong>and</strong>s<br />
Li Li*,WANG Quan-jin<br />
College of Economic & <strong>Management</strong>, Sichuan <strong>Agricultural</strong> University, Ya’an, 625014<br />
Abstract:Phosphorus was the main induction factor of water eutrophication. The system of<br />
subsurface flow constructed wetl<strong>and</strong>s was established. In terms of the authors’ test, it adopted<br />
potassium persulfate oxidation-molybdenum-antimony anti spectrophotometric method, with HATH<br />
spectrophotometer. Based on such factors as hydraulic loading rate, plants selection, pollution loading<br />
rate, seasonal variation influence, the experiment analyzed the effect of total phosphorus removal,<br />
Results indicated the four factors had significantly effect for total phosphorus removal rate. As<br />
hydraulic retention time was one to seven days, removal rate of the total phosphorus was 30 to 95.75<br />
percent. As hydraulic retention time was five days, effluent of total phosphorus was superior to A<br />
(0.5mg/L) criteria specified in GB 18918-2002. Logarithmic equation could fit the relationship<br />
between total phosphorus removal loading <strong>and</strong> hydraulic retention time well, With hydraulic retention<br />
time increasing, removal rate became decreasing, While removal amount was not rising continuously.<br />
It concluded from logarithmic equation that when hydraulic retention time was nine days, total<br />
removal amount (removal rate) became decreasing. The removal rates order of four plants was<br />
Zizania、Canna、Cyperus alternifolius <strong>and</strong> Coix lacryma-jobi. Removal loading of total phosphorus<br />
increases with pollution loading increasing <strong>and</strong> total phosphorus removal loading was liner with<br />
pollution loading, removal rate in summer was better than in winner, but there was good removal rate<br />
in winner.<br />
Evaluation of water resources for their sustainable utilization in<br />
Manas River basin<br />
Yang Guang1, 2, Li Junfeng1, 2,* , He Xinlin1, 2, Jia Xiaojuan1, 2<br />
1 College of Water Conservancy & Architectural Engineering, Shihezi University Shihezi, China,832000;<br />
2 Xinjiang Production & Construction Group Key Laboratory of Modern Water-Saving Irrigation, Shihezi, China,<br />
832000<br />
Abstract:Water shortage restricts the water resources sustainable development in the Manas River<br />
basin, so the evaluation of sustainable development is crucial to the social development. This article<br />
from the water, social, economic, ecological environment subsystems, set up the evaluation model<br />
through combination of entropy theory <strong>and</strong> projection pursuit; evaluate the sustainable development of<br />
water resources. The Evaluation results show that water resources sustainable development tends to<br />
benign trend. The evaluation method is reliable <strong>and</strong> reasonable. The evaluation results can afford<br />
scientific basis for water resources sustainable development <strong>and</strong> it is proved that EV-PP model is<br />
* Corresponding author: Li Li, sunmiy@yahoo.com.cn<br />
* Corresponding author: Li Junfeng, Email: mikeyork@163.com.<br />
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