简介:Floodingtimingandfrequencymayhavedifferenteffectsonthegrowthandcarbonmetabolismofplantsinwetlands.WetestedthishypothesisusingthreemarshplantsinSanjiangPlain,whichweregrowingindifferentfloodingtimingandfrequencyenvironmentsfor24days.Thethreemarshplantsindifferentelevationsalongawater-levelgradient,high-elevationspeciesCalamagrostisangustifolia,mid-elevationspeciesCarexlimosaandlow-elevationspeciesCarexlasiocarpa.Ourexperimentincluded6kindsoftreatments:control,longerfloodingtiming,medialfloodingtimingandfrequency(2treatments),andhigherfloodingfrequency(2treatments).LongerfloodingtimingandhigherfloodingfrequencytreatmentsledtosimilarreductionsinbiomassaccumulationandrelativegrowthrateofCalamagrostisangustifolia,whereasgrowthofCarexlimosawasnotaffectedbyeitherfloodingtimingorfrequency.However,biomassaccumulationandrelativegrowthrateofCarexlasiocarpawasonlyreducedbythehigherfloodingfrequency.StarchandsolublesugarcontentsofCalamagrostisangustifoliawerenegativelyaffectedbyfloodingfrequency.OnCarexlimosa,higherfloodingfrequencyresultedinhigherstarchcontent,butlongerfloodingtimingledtoaccumulatedstarchcontentinCarexlasiocarpa.SolublesugarcontentsofCarexlasiocarpaandCarexlimosawerenotaffectedbyeitherfloodingtimingorfloodingfrequency.Theseresultsindicatedthatgrowthresponsesofthethreemarshplantstofloodingtimingandfrequencywascloselyrelatedtothedifferentphysiologyofcarbohydratemetabolism.
简介:为了在量的特征和人的解决的空间模式探索地理差别,在三的环境适用性(HSES)塞满水库区域(TGRA),地面,气候,水文学,植被和另外的天赋因素被选择造过得去的环境评估,并且定量分析通过遥感(RS)和地理参考系统(GIS)被进行揭示地理特征和HSES的空间模式。结果如下被获得:(1)重庆的TGRA的居民与中等高HSES在区域被集中,它是在48%学习区域散布的78%全部的人口;(2)HSES是仔细与地面有关,并且它形成一个弧乐队空间继任模式:在东北和东南相对低当时在西方和南方比较地高;(3)大量人与低适用性在区域被散布(与更高的人口密度比西方的中国的一般水准),但是在这些区域的经济发展水平是相当低的。而且,这些区域是生态的敏感、易碎,许多种eco环境的问题被人的活动引起了。因此,人口移植和布局是为这些区域的发展的合理选择。