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《贵阳市烟田土壤水分动态变化特征分析与研究-论文.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、安徽农业科学,JournalofAnhuiAgri.Sci.2014,42(17):5437—5439责任编辑刘月娟责任校对李岩贵阳市烟田土壤水分动态变化特征分析与研究刁朝强,钱晓刚,黄宁,周建云(1.贵州省烟草公司贵阳市公司,贵州贵阳55oool;2.贵州大学,贵州贵阳550025)摘要[目的]为了掌握贵阳市烟田主要土壤水分变化动态,为烟田灌溉提供理论依据。[方法]分别对自然条件下不同季节、不同土层深度和坡度的自然降雨土壤水分动态进行研究。[结果]贵阳烟区在烤烟旺长期和成熟前期阶段性的土壤含水量是亏缺的,将限制烟叶产质量提高;成熟后期0~40am土层土壤含水量最高,伸根期变幅最小,旺长
2、期各土层的土壤含水量最低;受烤烟根系吸水综合作用的影响,层深15em的土壤受地表蒸发的影响强烈,而层深30em的土层正是烤烟根系密集区域,受根系的吸水影响较大;坡度可加大地表径流的作用,减少雨水的就地入渗量,降低烟地的蓄水量、保水量。[结论】自然雨养烟田土壤含水量呈浅“V”型,控水烟田土壤含水量呈倒“V”型,说明烟田抗旱能力随坡度增加而减低,在干旱季节旺长期和成熟期适量补水有利于烤烟产量的形成和品质的提升。关键词烤烟;水分;土壤;动态;特征中图分类号$572文献标识码A文章编号CI517—6611(2014)17—05437—03AnalysisandResearchofSoilMois
3、tureDynamicCharacteristicsinGuiyangCityDIAOChao·qiangetal(TobaccoCompanyinGuiyang,Guiyang,Guizhou550001).Abstract[Objective]Theresearchaimedtograspmoisturedynamicsinthemaintobaccofieldsoil,andprovideatheoreticalbasisfortheto—baccofieldirrigation.『Method]Undernaturalconditionsindifferentseasons,di
4、fierentsoildepthandslope,naturalrainfallandsoilmoisturedy—namicwerestudied.[Result]Guiyangsoilmoisturewasdeficientinvigorousgrowingperiodandthematurestage,whichwouldlimitthetobaccoleafproductionandqualityimprovement.Soilmoisturewasthehighestinthelatestageofmaturationlatein0—40am,thatinrootextendi
5、ngstagewasthesmallest,andsoilmoisturecontentintheperiodofvigorousgrowthwasthelowest.Affectingbythecomprehensiveeffectofwateruptakeoffluecuredtobaccoroot,soilinthelayer15cmwasinfluencedstronglybysurfaceevaporation,and30cmdeepsoillayerwasthetobae—eorootdenseregions,whichwasaffectedstronglybytheabso
6、rptionofroot.Slopecouldincreasethesurfacerunof,reducerainfallinfiltration,andreducesmokewaterstorageandwaterholdingcapacity.[Conclusion]Thenaturalrainedtobaccofieldsoilwaterc#ont州en篙t如show娶ed姆shallow“V”type.andcontrolwatercontentshowedinve~ed“V”type.Thedroughtresistanceoftobaccofielddecreasedwith
7、theincreaseoftheslope.蚰蛐∞Duringthedryseason,wateringrowingandmatureperiodofflue—curedtobaccowasfavorablefortheformationandtheenhancementofthequal—ity.KeywordsFlue—curedtobacco;Water;Soil;Dynamic;Characteristic所有雨水只有进入土
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