Effects of elevated CO_2 on sensitivity of six species of algae and interspecific competition of three species of alga

Introduction The atm ospheric C O 2 concentration increases at a rate of 1.5 滋 m ol/(m ol·a) and w ill double com pared to pre-industrial levels around the year 2050 (W atson et al., 1990). Its effects and m echanism by elevated CO 2 on global clim ate,…     

Characteristics of distribution of heavy metals insediment of Le An River

ＣｈａｒａｃｔｅｒｉｓｔｉｃｓｏｆｄｉｓｔｒｉｂｕｔｉｏｎｏｆｈｅａｖｙｍｅｔａｌｓｉｎｓｅｄｉｍｅｎｔｏｆＬｅＡｎＲｉｖｅｒＬｉＱｉ（ＲｅｓｅａｒｃｈＣｅｎｔｅｒｆｏｒＥｃｏ－ＥｎｖｉｒｏｎｍｅｎｔａｌＳｃｉｅｎｃｅｓ，ＣｈｉｎｅｓｅＡｃａｄｅｍｙ...     

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.     

Effects of elevated CO2 on sensitivity of six species of algae and interspecific competition of three species of algae

Effects of elevated CO, （5000 μl/L） on sensitivity comparison of six species of algae and interspecific competition of three species of algae were investigated. The results showed that, the cell densities of six species of algae grown in elevated CO2 significantly increased compared to those in ambient CO2 （360 μl/L）, and with the time prolonged, the increasing extent increased. Therefore, elevated CO2 can promote the growth of six species of algae. However, there were differences in sensitivity between six species of algae. Based on the effects of elevated CO2 on biomass, the sensitive order （from high to low） was Platymanas sp., Platymanas subcordiformis, Nitzschia closterium, Isochrysis golbana Parke 8701, Dunoliella salina, Chlorella sp., on the condition of solitary cultivation. Compared to ambient CO2, elevated CO2 promoted the growth of three species of algae, Platymanas subcordiformis, Nitzschia closterium and Isochrysis galbana Parke 8701 under the condition of mixed cultivation. The sensitivity of the three species to elevated CO2 in mixed cultivation changed a lot compared to the condition of solitary cultivation. When grown in elevated CO2 under the condition of mixed cultivation, the sensitive order from high to low were Nitzschia clostertium, Platymonas subcordiformis; and Isochrysis galbana Parke 8701. However, under the condition of solitary cultivation, the sensitive order in elevated CO2 was Isochrysis galbana Parke 8701, Nitzschia clostertium, Platymonas subcordiformis, from sensitive to less sensitive. On the day 21, the dominant algae, the sub-dominant algae and inferior algae grown in elevated CO2 did not change. However, the population increasing dynamic and composition proportion of three algal species have significantly changed.     

Effects of allelochemicals on activity of nitrate reductase

ＩｎｔｒｏｄｕｃｔｉｏｎＰｌａｎｔｓｔｒａｗａｓａｉｍｐｏｒｔａｎｔｍｅａｓｕｒｅｆｏｒｉｎｃｒｅａｓｉｎｇｔｈｅｆｅｒｔｉｌｉｔｙａｎｄｉｍｐｒｏｖｉｎｇｔｈｅｓｔｒｕｃｔｕｒｅｏｆｓｏｉｌ,ｈａｓｂｅｅｎｗｉｄｅｌｙａｐｐｌｉｅｄｉｎａｇｒｉｃｕ?..     

Photochemistry of chrysene adsorbedon several types of particle

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

Biodegradation of mixture of VOC''''s in a biofilter

IntroductionDeterioratingatmosphericairqualityhasresultinginmorestringentregulationsarebeingenforcedtocontrolairpollutants .Volatileorganiccompounds(VOCs)areamongthenewclassofaircontaminantsgeneratedfromavarietyofindustrialsources .Effortstocontroltheemis…     

A complete set of procedure for determination of multiresidue of pesticides in vegetables

A complete set of procedure for determination of multiresidue of pesticides in vegetables was presented in this paper.The complete set of procedure included three steps:bioassay,cholinesterase inhibition and GLC analysis.The samples could be identified to be contaminated with pesticides if 5% of house flies was knocked down in 50 tested house flies. Those samples contaminated with pesticides needed to be detected by AChE inhibition method.The qualitative and quantitative analyses were carried out by GLC.Recoveries ranged from 83.7% in Chinese cabbages to 105.6% in tomatoes for pyrethroids,and 84.0% in tomatoes to 102.7% in sweetbell redpeppes for organophosphorus compounds.Coefficients of variations ranged from 0.59% to organophosphorus compounds.Coefficients of variations ranged from 0.59% to 7.87% for pyrethroids. and 0.33% to 9.88% for organophosphorus compounds with vegetables. The complete set of procedure has been used successfully to analyze 7000 samples collected in Beijing. About 1% of the samp     

A review of the contributions of Albert Einstein to Earth Sciences—in commemoration of the World Year of Physics

The World Year of Physics (2005) is an international celebration to commemorate the 100th anniversary of Einstein’s “Annus Mirabilis.” The United Nations has officially declared 2005 as the International Year of Physics. However, the impact of Einstein’s ideas was not restricted to physics. Among numerous other disciplines, Einstein also made significant and specific contributions to Earth Sciences. His geosciences-related letters, comments, and scientific articles are dispersed, not easily accessible, and are poorly known. The present review attempts to integrate them as a tribute to Einstein in commemoration of this centenary. These contributions can be classified into three basic areas: geodynamics, geological (planetary) catastrophism, and fluvial geomorphology. Regarding geodynamics, Einstein essentially supported Hapgood’s very controversial theory called Earth Crust Displacement. With respect to geological (planetary) catastrophism, it is shown how the ideas of Einstein about Velikovsky’s proposals evolved from 1946 to 1955. Finally, in relation to fluvial geodynamics, the review incorporates the elegant work in which Einstein explains the formation of meandering rivers. A general analysis of his contributions is also carried out from today’s perspective. Given the interdisciplinarity and implications of Einstein’s achievements to multiple fields of knowledge, we propose that the year 2005 serve, rather than to confine his universal figure within a specific scientific area, to broaden it for a better appreciation of this brilliant scientist in all of his dimensions.     

Effect of acidic deposition on productivity of forest ecosystem and estimation of its economic losses in southern suburbs of Chongqing

In accordance with principle sand methods of ecology, this paper studied the effects of acidic deposition on productivity and volume increment of masson pine and Cinnamomum campora forest which are widely distributed in southern suburbs of Chongqing. Based on the field data and measurements, a multivariable stepwise regression model was established to analyze the effects of multiple environmental factors on the productivity of the forest ecosystems. This model was used to assess the volume and economic losses of these two forest ecosystems caused by acidic deposition. The results showed that, among the environmental factors, pH value of precipitation, soil depth, soil organic contents and slope are the dominant ones influencing the growth of masson pine forest. It is also shown that the acidic deposition has no clear relation to the growth of C.Campora forest, so development of such broad-leaved forest is suitable in the area.     

Seasonal changes of endogenous ABA and cytokininsin environmental adaptation of differentecotypes of reed plants

ＳｅａｓｏｎａｌｃｈａｎｇｅｓｏｆｅｎｄｏｇｅｎｏｕｓＡＢＡａｎｄｃｙｔｏｋｉｎｉｎｓｉｎｅｎｖｉｒｏｎｍｅｎｔａｌａｄａｐｔａｔｉｏｎｏｆｄｉｆｆｅｒｅｎｔｅｃｏｔｙｐｅｓｏｆｒｅｅｄｐｌａｎｔｓＷａｎｇＨｏｎｇｌｉａｎｇ，ＺｈａｎｇＣｈｅｎｇｌｉ...     

Influence of acid deposition on atmospheric corrosion of zinc

Site exposure tests both open and sheltered have been carried out in acid deposition area in Southwest China. Results from six sites show that acid deposition exerts a great influence on atmospheric corrosion of Zn, and it is more serious in wet condition. Basically, Zn corrosion is directly proportional to time of exposure. While SO2 is the main pollutant of the atmosphere environment, Zn corrosion has a linear relationship to SO2 depositing rate and a hyperbolic to rain pH value.Observations by SEM, EDAX and X-ray diffraction show that under sheltered exposure condition, the corrosion products of Zn in heavy acid deposition area principally are sulphates.Based on the corrosion rates measured, the working life of galvanized steel can be predicated.     

Determination of atmospheric concentrations of halocarbons in Beijing area

Gas chromatography with ambient temperature injection and frozen-trapped techniques was used to determine the atmospheric concentrations of halocarbons over Beijing. Halogenated compounds such as CFC-11, CFC-12, CHCl_3, CCl_4, CH_3CCl_3, CHCl =CCl_2, and CCl_2=CCl_2 were measured and their concentrations are 109±8, 234±13, 47±22, 97±24, 88±29, 11±1 and 17±3 (pptv), respectively.     

Appljcation of the thermal lens effectfor determination of iodide

ＡｐｐｌｊｃａｔｉｏｎｏｆｔｈｅｔｈｅｒｍａｌｌｅｎｓｅｆｆｅｃｔｆｏｒｄｅｔｅｒｍｉｎａｔｉｏｎｏｆｉｏｄｉｄｅＧｕＸｉａｏｍｅｉ：ＷａｎｇＳｈｕｎｒｏｎｇ；ＱｉｎＫｅｘｕａｎ；Ｌｉｊｉｅｃｈｕｎ（ＲｅｓｅａｒｃｈＣｅｎｔｅｒｆｏｒＥｃｏ－Ｅｎｖｉ...     

The crystal growth of hydroxyapatite in presence of collagens

The crystal growth of hydroxyapatite (HAP) seeds in presence of the abnormal collagen secreted by the chondrocyte grown in media containing free radical sources or fulvic acid and the type II collagen (pig cartilage) damaged by · OH and fulvic acid(FA) from potable water in endemic region of Kaschin-Beck disease (KBD) was studied. The results showed that in the former case, the abnormal collagen rich in type I collagen promoted mineralization in contrast with the type n collagen. The oxidatively damaged type II collagen became less inhibitive or even promotive. In all cases, the reaction followed a second order kinetics. The powder X-diffraction analysis and SEM observation indicated that the damaged type II collagen lowers the crystalinity in the beginning and made the final crystal more agglomerated. All the results showed that the abnormal and the damaged cartilage matrix affected the bimineralization and was likely to have played an important role in the development of KBD.     

Introduction of DWSEC

The Drinking Water Science and Engineering Center (DWSEC) is based on the State Key Laboratory of Environmental Aquatic Chemistry in the Research Center of Eco-Environmental Sciences (RCEES),the Chinese Academy of Sciences. Through integration of other pertinent research forces in the RCEES and establishment of strategic cooperative relations with water-related industries and institutions,DWSEC is aimed to provide a scientific and technological platform for     

A method of analysis of macro water environmental systems

ＡｍｅｔｈｏｄｏｆａｎａｌｙｓｉｓｏｆｍａｃｒｏｗａｔｅｒｅｎｖｉｒｏｎｍｅｎｔａｌｓｙｓｔｅｍｓＢａｏＪｉｎｇｌｉｎｇ（ＴｉａｎｊｉｎｉｎｓｔｉｔｕｔｅｏｆＥｎｖｉｒｏｎｍｅｎｔＰｒｏｔｅｃｔｉｏｎＳｃｉｅｎｃｅ，Ｔｉａｎｊｉｎ３００１９１，Ｃｈｉ...     

Influence of inorganic salt on aerobic biodegradability of dyestuffs

ＩｎｔｒｏｄｕｃｔｉｏｎＩｎｄｕｓｔｒｉａｌｗａｓｔｅｗａｔｅｒｏｆｔｅｎｃｏｎｔａｉｎｓｈｉｇｈｌｙ ｃｏｎｃｅｎｔｒａｔｅｄｉｎｏｒｇａｎｉｃｓａｌｔｓ.ＣｏｍｍｏｎｃａｔｉｏｎｓｉｎｃｌｕｄｅＫ ,Ｎａ ａｎｄＣａ2 ,ａｎｄｃｏｍｍｏｎａｎｉｏｎｓｉｎｃｌｕｄｅＣｌ-,ＳＯ42 -ａｎｄＮＯ3-.Ｆｏｒｅｘａｍｐｌｅ ,ｗａｓｔｅｗａｔｅｒｆｒｏｍｔｈｅｐｒｏｃｅｓｓｏｆｄｙｅｓｔｕｆｆｓ,ｓｕｃｈａｓｃａｔｉｏｎｉｃｂｌｕｅＸ ＧＲＲＬ ,ｂａｓｉｃｂｒｏｗｎ ,ｂａｓｉｃｏｒａｎｇｅ,ｂａｓｉｃｖｉｏｌｅ…     

Prediction model of mercury accumulation in fish of reservoirs

ＩｎｔｒｏｄｕｃｔｉｏｎＨｅａｌｔｈｈａｚａｒｄｓｆｒｏｍｍｅｒｃｕｒｙｉｎｔｈｅｅｎｖｉｒｏｎｍｅｎｔｈａｖｅｃａｕｓｅｄｒｅｓｔｒｉｃｔｉｏｎｓｉｎｔｈｅｕｓｅｏｆｍｅｒｃｕｒｙａｎｄａｓｔｒｉｃｔｅｒｃｏｎｔｒｏｌｏｆｔｈｅｒｅｌｅａｓｅｏｆｍｅｒｃｕｒｙｆｒｏｍｉｎｄｕｓｔｒｉａｌａｎｄｏｔｈｅｒｕｓｅｓ.Ｂｕｔａｔｔｈｅｓａｍｅｔｉｍｅｔｈｅｓｅｓｏｕｒｃｅｓｏｆｍｅｒｃｕｒｙｈａｖｅｂｅｅｎｓｕｂｊｅｃｔｅｄｔｏｒｅｇｕｌａｔｉｏｎ ,ｔｗｏｎｅｗｓｏｕｒｃｅｓｈａｖｅａｐｐｅａｒｅｄ …     

Utility of semivariogram for spatial variation of soil nutrients and the robust analysis of semivariogram

ＩｎｔｒｏｄｕｃｔｉｏｎＧｅｏｓｔａｔｉｓｔｉｃｓｈａｓｐｒｏｖｅｎｕｓｅｆｕｌｆｏｒｃｈａｒａｃｔｅｒｉｚｉｎｇａｎｄｍａｐｐｉｎｇｔｈｅｓｐａｔｉａｌｖａｒｉａｔｉｏｎｏｆｓｏｉｌｐｒｏｐｅｒｔｉｅｓ (Ｗｅｂｓｔｅｒ,1985;Ｔｒａｎｇｍａｒ,1985;Ｇｏｏｖａｅｒｔｓ ,1999) .Ｍｏｓｔｐｒｅｖｉｏｕｓｇｅｏｓｔａｔｉｓｔｉｃａｌｓｔｕｄｉｅｓｆｏｃｕｓｅｄｏｎｔｈｅｄａｔａｏｆａｒｅｌａｔｉｖｅｌｙｓｍａｌｌｓｐａｔｉａｌｓｃａｌｅ(Ｃｈｉｅｎ ,1997) .Ｔｈｅａｐｐｌｉｃａｔｉｏｎｏｆｇｅｏｓｔａｔ…