欢迎来到天天文库
浏览记录
ID:51442247
大小:1.99 MB
页数:7页
时间:2020-03-24
《几种收割策略下轮叶黑藻(Hydrilla verticillata)的生长恢复研究.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、。e疗如iff越Ⅱ)分别进行了连续4次收割实验,研究收割强度、收割频次对其生长恢复的影响。结果表明,温度相近时,收割强度较高或收割频数增加将延长轮叶黑藻的恢复时间。以18cm强度收割第2次、第3次后,轮叶黑藻需近2个月的时间恢复;以12cm强度第3次收割后,需43d恢复;其余各次收割后,轮叶黑藻均在1个月内恢复。8月下旬,以18cm强度收割第3次后,普通枝条及匍匐枝的数目与总长明显减少,从而抑制了轮叶黑藻以匍匐枝和冬芽进行无性繁殖。其他各次收割均处于轮叶黑藻旺盛生长的季节,收割后,普通枝条和匍匐枝的数目和总长
2、明显增加,将不会抑制植物的无性繁殖。各次收割后至少75%的新生枝条从基部萌生,这些枝条成为生长最为旺盛的部分。在各处理组中,轮叶黑藻干重的相对增长率随收割次数的增加呈现较明显的下降趋势,而根冠比随着收割次数的增多而增大。关键词:富营养化;收割策略;轮叶黑藻;生长恢复中图分类号:x173文献标志码:A文章编号:1672—2043(2011)07—139l—07TheVegetatiVeRecoVeryof殛胁t抛1,阴如讽比口UnderseVemlHarvestingSt阳te矛懿zU0Jin-chen91’2
3、'UANGwei。,XUDoIl91,HEFeIlg。,ZHOUQi舯_hon91,WUzhen-bin卜(1.StateKeyLabomtoryofF.reshwaIerEcology舳dBiotecllllology,InstituteofHydrobiology,CAS,Wuhan430072,China;2.Couege““feSciences,LudongUniversjty,Y锄tai264025,Chi眦)A呐艄哪:Thee‰ctsofcuttingintensityand舶quency∞tll
4、evegetativerecoveryof删耽移e疗如甜Z地gro聊linbucket8.而thawaterdeptIlof24cm,weIeinvestigatedinas西esof4con∞cutiveexperimentswithdi丘_erentcuttingintensitiesat6cm,12cmand18cmf如mtheapexoftIlepl明t8,respectivelytllI.0ugIImid—MaytolateOctober'2005.neresultsshowedtIlatbotIl
5、higllcuningintensityandhigIIcuuing矗.equencyprolongedt}letimeofVegetativerecoveryof鼠秽e厅站以Z口衄whentlletempe咖rev撕ationw鹊negligible.Aperiodof2I∞ntIlsw鹳鹏ededfortheIecoveryofpl明tsbeingcut珊at18cm缸哪theapexaftert}lesecondandtIletllirdcut一础毫,锄d43daysforplaIltscutat12c
6、m肺mtIleapexafterthethirdcut—o皿舳dlessth明am佣tIfortherestcut一豳.InhteAugIlst,tIIenumberandlengtIlofbothtllenomlalshoots蚰dIhestolonsdeclinedsi印mc锄ny曲erthetllirdcu卜offat18cmf而mtlle印ex“theplants,sol王Ieasexualpropagationinthef妇ofstolon8orwimerbudswouldbeinhibited.A
7、Utheothercuttingtimewere惭tllinmeb∞mingseasonfor尼割e疗缸“Za瓴ttlenuIlllber明dtIletotaJlengtll0fnomlaJshoots蚰dstolonsincr朗∞dsignificantlyaftereachcu卜。噩thereforethea∞xualpropagationwollldnotbeinhibited.More山柚75%0fthenewshootsweregeneratedfIlomtlleb硝alpanoft量leplant
8、s出ereverycut卅:锄dthoseshootsco珊titutedtIIef如testgmwingpansoftlleplant8.AJongwith山eincreaseintIletimesofcut一础童inallexPerimentalgmups,tllefelativeincreasemteofdryweightin日.移e疵洌以口declinedsigIlific锄tly,butt
此文档下载收益归作者所有