Simulated seasonal movement of precipitation zone in rainy season over China and its change on CO2-doubling

In this paper, an investigation of simulated monthly precipitations from April to September is made. Though the precipitations are sometimes overestimated or underestimated, the geographical advance and recession of precipitation zones are well simulated by the UKMO global climate model with a simple mixed-layer ocean. Main characteristics of large-scale precipitation distribution are changed less on CO₂-doubling, but the change is significant in some regions. The change in precipitation threatens us while the dry region is imposed by rainfall defect or the wet region by abundant rainfall induced by CO₂-doubling.     

NH_3·H_2O-KI改良法测定水中溶解氧

本方法在原测定溶解氧方法的基础上进行了改进,用 NH_3·H_2O—KI、H_2SO_4—H_3PO_4分别代替了原方法中的 NaOH—KI、H_2SO_4;同时作了样品空白,校正了氧化还原物质产生的干扰。据实验:1mg/1Fe~(2+)、0.5mg/1NO_2~-及浓度不太高的 S~(2-)、S_2O_3~(2-)、SO_3~(2-)、Cl_2对测定不产生干扰。对蒸馏水、自来水、废水进行测定,均获得满意结果。     

On the indicator of weak sustainability

ＯｎｔｈｅｉｎｄｉｃａｔｏｒｏｆｗｅａｋｓｕｓｔａｉｎａｂｉｌｉｔｙＺｈａｏＪｉｎｇｚｈｕ（ＲｅｓｅａｒｃｈＣｅｎｔｅｒｆｏｒＥｃｏ－ＥｎｖｉｒｏｎｍｅｎｔａｌＳｃｉｅｎｃｅｓ,ＴｈｅＣｈｉｎｅｓｅＡｃａｄｅｍｙｏｆＳｃｉｅｎｃｅｓ,Ｂｅｉｊｉｎｇ１...     

Photochemistry of chrysene adsorbedon several types of particle

ＰｈｏｔｏｃｈｅｍｉｓｔｒｙｏｆｃｈｒｙｓｅｎｅａｄｓｏｒｂｅｄｏｎｓｅｖｅｒａｌｔｙｐｅｓｏｆｐａｒｔｉｃｌｅＺｈｏｎｇＪｉｎｘｉａｎ；ＭａｕｌｄｉｎＲ．Ｆ．；Ｄｕｎｓｔａｎ，Ｔ．Ｄ．Ｔ，Ｓａｎｄｅｒｓ，Ｊ．Ｋ．，Ｈｉｐｐｓ，Ａ．Ｄ．，Ｗｅｈｒｙ，...     

Modelling of water quality of Minjiang estuary

In order to establish economic development region at Mawei districtwhich is nearby downstream of Minjiang river and to answer the question of impact of economic development on water quality of Minjiang estuary, the analyses of hydrologic and hydraulic characteristics of Mawei reach of Minjiang tidal river, a two-dimensional mathematical model has been established and simulation of water quality was studied. The results show that the flushing time of a conservative pollutant during dry and raining period are 12 and 7 days respectively from Mawei to Minjiang mouth, the decay rate constants of BOD and NH3-N are 0.1 to 0.4 and 0.18 to 0.45 d-1 respectively. The capacity of dilution and assimilation for pollutants is larger.     

Chemical endemic diseases and their impact on population in china

This paper deals with some endemic diseases related to selenium, iodine and fluoride in eco-environment. Keshan disease and Kaschin-Beck disease are associated with low selenium, they mainly occur in a belt zone across China ranging from North-East to South-West. Selenium contents in food grains and human hair from the disease affected areas are usually below 0.020ppm and 0.20ppm respectively. The endemic goitre caused by iodine deficiency distributes extensively in China, mainly in mountainous and hilly districts, swamp and peat areas, some sand soil and limestone areas. Also there is another kind of endemic goitre which caused by iodine excess in interior and coast areas. Endemic cretinism usually occurs in the endemic goitre seriously affected areas. Endemic fluorosis is also widely distributed in China, but mainly occurs in dry or semi-dry areas of north China. The fluoride sources for causing endemic fluorisis are drinking water and food grains polluted by coal smoke in the backing process of maize     

A comparative assessment of alternative approaches to sustainable development

ＡｃｏｍｐａｒａｔｉｖｅａｓｓｅｓｓｍｅｎｔｏｆａｌｔｅｒｎａｔｉｖｅａｐｐｒｏａｃｈｅｓｔｏｓｕｓｔａｉｎａｂｌｅｄｅｖｅｌｏｐｍｅｎｔＰａｎＪｉａｈｕａＩｎｓｔｉｔｕｔｅｏｆＷｏｒｌｄＥｃｏｎｏｍｉｃｓａｎｄＰｏｌｉｔｉｃｓ，ＣｈｉｎｅｓｅＡｃａ...     

Effects of main range and strength factors on change of COD in a shallow lake 

ＥｆｅｃｔｓｏｆｍａｉｎｒａｎｇｅａｎｄｓｔｒｅｎｇｔｈｆａｃｔｏｒｓｏｎｃｈａｎｇｅｏｆＣＯＤｉｎａｓｈａｌｏｗｌａｋｅＦａｎＣｈｅｎｇｘｉｎＮａｎｊｉｎｇＩｎｓｔｉｔｕｔｅｏｆＧｅｏｇｒａｐｈｙａｎｄＬｉｍｎｏｌｏｇｙ，ＣｈｉｎｅｓｅＡｃａｄ...     

Analysis and improving ways for water condition in winter wheat field of dryland in subhumid areas of the Loess Plateau

Based on the soil moisture data from the locating experiments from 1986—1990, and using the water balance method, the water supply and demand state in the field of winter wheat, and the ways for improving water condition in dryland of dry subhumid area of the Loess Plateau were studied. The results suggested that a low precipitation satisfying ratio of 42.9%—58.8% appears in the growing period of winter wheat, and the yield, to a great extent depended on the water that was stored in deep soil layer in the previous rainy season. The filed trial results showed that tillage in the summer fallow period,straw cover, soil moisture regulation with adequate fertilization, crop rotation and proper cropping system could be the efficient ways for improving the water condition,and for the exploitation and utilization of natural water resources(both precipitation and soil water) in the winter wheat field of dryland.      

Ecodynamic models accounting for the changes in lake ecosystem

ＥｃｏｄｙｎａｍｉｃｍｏｄｅｌｓａｃｏｕｎｔｉｎｇｆｏｒｔｈｅｃｈａｎｇｅｓｉｎｌａｋｅｅｃｏｓｙｓｔｅｍＺｈａｎｇＹｏｎｇｚｅ，ＨｕａｎｇＣｈｕａｎｙｏｕ，ＷａｎｇＸｕａｎＤｅｐａｒｔｍｅｎｔｏｆＨｙｄｒａｕｌｉｃＥｎｇｉｎｅｅｒｉｎｇ，Ｓｉｃｈｕ...