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《類蘆根系對不同強(qiáng)度干旱脅迫的形態(tài)學(xué)響應(yīng)-中國農(nóng)學(xué)通報(bào)》由會員上傳分享,免費(fèi)在線閱讀,更多相關(guān)內(nèi)容在工程資料-天天文庫。
1、中國農(nóng)學(xué)通報(bào)2012,28(28):44-48ChineseAgriculturalScienceBulletin類蘆根系對不同強(qiáng)度干旱脅迫的形態(tài)學(xué)響應(yīng)1,21,21,21,21,21,2蔡麗平,吳鵬飛,侯曉龍,馬祥慶,鄭珊珊,鄭錦文(1福建農(nóng)林大學(xué)林學(xué)院,福州350002;2福建農(nóng)林大學(xué)森林與環(huán)境研究所,福州350002)摘要:為了探討類蘆根系對干旱脅迫逆境的響應(yīng)規(guī)律,為其在水土流失區(qū)推廣和應(yīng)用提供科學(xué)理論依據(jù),以水土保持先鋒植物類蘆為研究對象,通過4個(gè)不同干旱強(qiáng)度脅迫的盆栽試驗(yàn),測定不同干旱處理對類蘆根系生物量和根系形態(tài)指標(biāo)。結(jié)果表
2、明:不同干旱強(qiáng)度脅迫處理,類蘆根系總長度、表面積、平均直徑、根系生物量的差異明顯,而根體積差異較小。在不同程度干旱脅迫下,根體積、根平均直徑隨著干旱脅迫程度增加逐漸減小,且均比充足供水的??;而類蘆根系總長度、根表面積、根系生物量、根冠比均比充足供水的大,中度干旱脅迫條件下(田間持水量40%±5%),類蘆的根系長度、根表面積、根系生物量、地上部生物量、根冠比均為最大。類蘆具有龐大的根系,抗旱和耐旱能力強(qiáng);類蘆根系增強(qiáng)延伸能力、擴(kuò)大與土壤接觸面積是對干旱逆境的形態(tài)學(xué)響應(yīng)機(jī)制之一。關(guān)鍵詞:干旱脅迫;類蘆;根系形態(tài);生物量;田間持水中圖分類號:
3、S157文獻(xiàn)標(biāo)志碼:A論文編號:2012-2561MorphologicalResponsetoDifferentDroughtStressintheRootsofNeyraudiareynaudiana1,21,21,21,21,21,2CaiLiping,WuPengfei,HouXiaolong,MaXiangqing,ZhengShanshan,ZhengJinwen(1CollegeofForestry,FujianAgricultureandForestryUniversity,Fuzhou350002;2Institute
4、ofForestryandEnvironment,FujianAgricultureandForestryUniversity,Fuzhou350002)Abstract:InordertodiscusstheresponselawofrootinNeyraudiareynaudianatodroughtstress,andprovidescientifictheoreticalbasisforthepromotionandapplicationofNeyraudiareynaudianainsoilerosionarea,taking
5、pioneerspeciesNeyraudiareynaudianawhichwaswidespreadinsouthernChinaregionofwaterandsoilconservationastheresearchobject,potexperimentwith4differentdroughtstresswasdesigned,rootmorphologyindexandbiomassdistributionweredeterminedindifferenttreatments,andmorphologicalrespons
6、etodroughtstresswasresearched.Theresultsshowedthatamongtreatmentswithdifferentdroughtstress,therewassignificantlydifferentintotalrootlength,rootsurface-area,rootaveragediameter,rootbiomassofNeyraudiareynaudiana,butnotintherootvolume.Therootvolumeandrootaveragediameterdec
7、reasedwithincreasingdroughtstress,andtherewerelowerunderdroughtstressthanenoughwatersupplies.Thetotalrootlength,rootsurface-area,rootbiomass,root-shootratioweregreaterunderdroughtstressthanenoughwatersupply,andtherewerethelargestundermoderatedroughtstresswithfieldmoistur
8、ecapacityby40%±5%amongdifferenttreatments.Neyraudiareynaudianahadstrongdrought-resistantanddrought-tole