土壤微生物ATP、脱氢酶和尿素酶活性的ED50值评价外源镧的生物毒性

０IntroductionRareearthsarenowappliedwidelyinChina，whichcanimprovecropsyieldsandthetheirqualit－ies犤１犦．Thebeneficialeffectsmaybeduetothestimu－latoryeffectsoftheseelementsonthenutrientuptakebyplantsorontheincreasingofchlorophyllsynthesisintheplants犤２犦．Whilealotofresearcheshavebeendoneontheimprovednutritionofcropsafterapplica－tionofrareearths，muchlessattentionhasbeenpaidtothedeteriorationofsoilqualityduetotheapplicationofrareearthsforyears犤３犦．Scientistshavediscoveredthataccumula…     

A Study of Impacts of Global Sea Level Rise on Salt Water Intrusion Into the Changjiang Estuary

Using the methods of empirical correlation and numerical analogue computation of the longitudinal distribution of two-dimensional chlorinity and combined with the actual situation of water supply in the Changjiang Estuary, a calculation and analysis have been made in this paper of the impacts of sea level rise of 0.5—1.0 m in the Changjiang Estuary in the next century on the probabilities of hourly chlorinity of more than 100×10~(-6), 200×10~(-6) and 250×10~(-6) during the dry season st Wusong station and on the intrusion distance of the isohalines of 1×10~(-3) and 5×10~(-3) during the ebb tide stand of the dry season in the South Branch as well as on the longitudinal distribution of the chlorinity of the South Branch in the most unfavorable situation with the minimum monthly mean discharge during the special dry year.     

全球海平面上升对长江口盐水入侵的影响研究

本文采用经验相关和两维氯度沿程分布数值模拟计算的方法,结合长江口地区供水实际情况,就下一世纪长江口海平面上升0.5—1.0 m对吴淞口枯季逐时含氯度大于100×10~(-6),200×10~(-6)和250×10~(-6)的机率、南支河段枯季落憩1×10~(-3)和5×10~(-3)等盐度线的入侵距离以及在出现长江特枯水年最小月均流量的最不利情况下,南支河段氯度沿程分布的影响进行了分析和计算。