Huang, Ding

Li, Zizhong

Wang, Hao

Wang, Zhongyan

English

University of Kentucky

University of Kentucky UKnowledge International Grassland Congress Proceedings 21st International Grassland Congress / 8th International Rangeland Congress Effects of Single Irrigation on Yield and WUE of Siberian Wildrye Grass in Agro‐Pastoral Transition Zone of China Hao Wang China Agricultural University, China Zizhong Li China Agricultural University, China Zhongyan Wang China Agricultural University, China Ding Huang China Agricultural University, China Follow this and additional works at: https://uknowledge.uky.edu/igc  Part of the Plant Sciences Commons, and the Soil Science Commons This document is available at https://uknowledge.uky.edu/igc/21/7-1/35 The 21st International Grassland Congress / 8th International Rangeland Congress took place in Hohhot, China from June 29 through July 5, 2008. Proceedings edited by Organizing Committee of 2008 IGC/IRC Conference Published by Guangdong People's Publishing House This Event is brought to you for free and open access by the Plant and Soil Sciences at UKnowledge. It has been accepted for inclusion in International Grassland Congress Proceedings by an authorized administrator of UKnowledge. For more information, please contact UKnowledge@lsv.uky.edu. 瞯 ]852　 瞯 　 Multifunctional Grasslands in a Changing World 　 Volume Ⅰ 　Grasslands/Rangelands Resources and Ecology ———Water Resources in Grasslands/RangelandsEffects of single irrigation on yield andWUE of siberian wildrye grass in agro‐pastoral transitionzone of ChinaHao W ang , Ziz hong L i , Zhongyan W ang , Ding H uangCollege o f Resources and Env ironmental Sciences , China A gricultural University , Bei j ing 100094 , China ,E‐mail : z iz hong＠ cau .edu .cnKey words : Irrigation ; siberian wildrye grass ; yield ; water use efficiency ; agro‐pastoral transition zone of ChinaIntroduction The recent studies showed that deficient irrigation increased water use efficiency ( WUE) whereas full irrigationdecreased it ( Waldron et al . , ２００２ ) . Recent research on the relationship between forage dry matter yield and totalevapotranspiration ( ET ) showed linear and curvilinear relationships ( Nielsen et al .２００６ ) .Irrigating in the elongating stageincreased the grow th of siberian wildrye grass significantly , and forage yield could benefit .Materials and methods The field experiment was conducted on the Yu摧ershan Demonstration Pasture of China AgriculturalUniversity in Bashang Plateau in the typical agro‐pastoral transition zone of China ( １１６°１１′E , ４１°４５′N , elevation of １４６０ m)during ２００２‐２００４ .The treatments included : no irrigation ( NI ) , full irrigation ( FI) and single irrigation in the key growingstage ( KI) .　 　 Figure 1 The yield response f unction and the relationshipbetween WUE and total ET .Results Although forage yield of irrigated treatments weremuch larger than that of NI , differences were notsignificant between FI and KI ( Table １ ) .WUE could beincreased by irrigation and the effect of KI was better thanthat of FI . It was obvious that water can be usedsufficiently in KI .FI with lower WUE would be morecostly and waste of water resources .Regression analysisshowed that forage yield and WUE were significantlyrelated t ET with quadratic responses ( Figure １ ) , the R２was ０ .８５ and ０ .５８ , respectively .Conclusions Forage yield of KI reached about ９０％ of FIwith only ３０％ of the irrigated water .KI was a betterirrigation schedule in semiarid areas .The yield responsefunction and the relationship between WUE and total ETwere significant and quadratic .Table 1 The evapotransp iration ( ET ) , f orage yield and w ater use e f f iciency (WUE) 倡Year T ET ( mm) Yield ( kg ha‐１ ) WUE ( kg m‐３ )２００２２００３２００４NIFIKINIFIKINIFIKI２８８ g.０ ± ４ .２ a３８７ .２ ± ２０ .１ c３４０ .５ ± １１ .４ b２８９ .６ ± ６ .５ a４４０ .０ ± １６ .３ c３３３ .０ ± ８ .３ b２７２ .８ ± ４ .７ a３８０ .２ ± ６ .９ c３４３ .５ ± ９ .９ b２９７０ �.０ ± ７７ .９ a６５２０ .０ ± １７１ .５ c５７２５ .０ ± １７７ .８ b２４００ .０ ± ８１ .６ a７１３３ .３ ± ３４７ .２ c６２３０ .０ ± １６０ .６ b３５５３ .６ ± ３７０ .３ a６４８９ .１ ± ８０３ .６ b６３３３ .３ ± ７７５ .９ b１ Z.０ ± ０ .０ a１ .７ ± ０ .１ b１ .７ ± ０ .１ b０ .８ ± ０ .０ a１ .６ ± ０ .０ b１ .９ ± ０ .１ c１ .３ ± ０ .１ a１ .７ ± ０ .２ ab１ .８ ± ０ .２ b倡 T : treatment .Values followed by the same letter within a column are not significantly difference at p ＝ ０ .０５ .ReferenceNielsen , D .C . , Vigil , M .F . , Benjamin , J .G .(２００６) .Forage yield response to water use for dryland corn , millet , and triticalein the central Great Plains .A gron .J .９８ , ９９２‐９９８ .Waldron , B .L . , Asay , K .H . , Jensen , K .B .( ２００２ ) .Stability and yield of cool‐season pasture grass species grown at fiveirrigation levels .Crop Sci . ４２ , ８９０‐８９６ .0 Y= -0.1558 ET 2+136.10 ET-22577, R2=0.8461 8000 V WUE= -5.22 •10-5 ET 2+ 0.04 ET -6.0, R2 =0.5839 0 00 3 c9 °:' 6000 E 0 .s:::: E Cl) 2 Cl) 6 v,~ V ~ "O UJ ai 4000 'vi 'VV ::J :,-::: '• V s 2000 250 300 350 400 450 500 ET (mm) 

Effects of Single Irrigation on Yield and WUE of Siberian Wildrye Grass in Agro‐Pastoral Transition Zone of China

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Effects of Single Irrigation on Yield and WUE of Siberian Wildrye Grass in Agro‐Pastoral Transition Zone of China

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