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The agricultural pollution of non-point sources is the main cause of the eutrophication of surface water environment in rural areas. The pollution loads of COD, TN and SS were estimated by investigating the non-point sources in the upper Zihe river basin. The results showed that the yearly pollution load of every pollutant of non-point sources was higher than that of point sources. In the normal year,...
According to the groundwater level changes after the construction of Luohe River water projects in Luoyang, numerical simulation method is used to analysis the exploitation potential of groundwater resources of Luoyang Basin. The results show that the construction of Luohe River water projects strengthen the groundwater recharge from Luohe River, an increase of about 0.8×108 m3/a. The groundwater...
To study HCHs and DDTs contents and their spatial distribution in the agricultural soil of Shanghai suburb, the residue amounts of HCHs and DDTs in 2413 surface soil samples were determined. The results showed that concentrations of HCHs ranged from 0 to 1.000 mg/kg and DDTs ranged from 0 to 3.000 mg/kg, with occurrence of 88.3% and 98.3%, respectively. The cumulate ratios of soil samples with HCHs...
The application of nitrate is an accepted procedure to manage eutrophication municipal rivers by controlling the phosphorus release from sediments into overlying water and offering electron acceptor for microorganism metabolism. An in-situ-experiment was carried out to oxidize the sediment by direct calcium nitrate injection. Phosphorus release from sediment injected calcium nitrate was almost stopped...
The coalbed methane(CBM) exploitation is not only access to clean energy and reduces coal mine disasters, but also decreases greenhouse gas emissions, which produces favorable economic and social benefits. But water resources (including surface water and groundwater) damage can not be ignored in CBM exploitation. According to drilling, cementing, logging, perforating, hydraulic fracturing and drainage...
The marine air-conditioning was important equipment on board the ship. It created the comfortable and cozy surrounding for the crew in the working time and daily lives. The fresh air for the air condition system was essential to keep the crew watchful during the watch-keeping. What is more, the condition outside of the marine vessel is diverse; the self-adjustability of the marine air conditioning...
Tanghai wetland and bird nature protection area is a provincial level nature protection area. As a result of global climate change, the average temperature of Tanghai wetland has increased in the past 30 years. The change in temperature influences the water cycle directly. In this paper, the changing on Tanghai wetland water environment is explained from the temperature, precipitation, evaporation,...
This passage takes the environment factor as an exchange object, through the theories analysis and assumption examples on a series of H-O model, to point out the establishment of carbon emissions exchange market maybe make our country to be a cheaper tool of reducing dangerous emissions. By carrying on a research on the model in the closed situation, we know under the objective conditions our trade...
For treating the coal mining subsided area, coal gangue is usually used to filling the subsided area and topsoil will be covered to reclaim, then the abandoned land will be used to plant crops, but different topsoil thickness will influence the nutrient content and the yield of crop. Xinzhuangzi coal mine reclamation land is chosen and different thickness topsoil is sampled to analyze the soil quality...
Use micro-evaporating dish to test the soil evaporation of daily sprinkling during the growth period of summer maize under the condition of controlled alternate furrow irrigation, analyze its change law and study the main environmental factors which have effected soil evaporation of daily sprinkling, finally establish the relationship between relative strength of soil surface evaporation and water...
In addition to the balanced scorecard, there are other performance evaluations of knowledge management approaches: knowledge-based economy value-added, economic value added, activity-based costing. These three methods are biased towards the financial level, and the indicators are applied to knowledge management evaluation. The primary role of the use of knowledge management pays more attention to...
Estimation of pollutant concentration in agricultural drainage is the key point of quantitative research on agricultural non-point source pollution load. Synthesis of fertilization and irrigation is used as an impulse input to the farmland, meanwhile, the pollutant concentration in agricultural drainage is looked as the response process corresponding to the impulse input,the migration and transformation...
Saline irrigation decreased the evapotranspiration (ET) of Haloxylon Ammodendron Bunge (H. Ammodendron) and Caragana Karshiskii Kom (C. Karshiskii) via reducing transpiration water, and it also changed the proportion of transpiration in ET: the proportion of evaporation from soil surface increased, and the proportion of transpiration in ET decreased when irrigating with higher salt concentration....
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