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XXI International Grassland Congress / VIII International Grassland Congress Proceedings International Rangeland Congress

Seedling Emergence and Survival of lactea. var. chinensis in Different Vegetations

Y. C. Sun Agricultural University, China

Z. M. Yang August First Land Reclamation University, China

Kun Wang China Agricultural University, China

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Part of the Sciences Commons, and the Soil Science Commons This document is available at https://uknowledge.uky.edu/igc/21/14-2/25 The XXI International Grassland Congress / VIII 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 [email protected]. Multifunctional Grasslands in a Changing World Volume Ⅱ 瞯 6 23 瞯 ]

Seedling emergence and survival of Iris lactea . var .chinensis in different vegetations

倡 Y . C . Sun 1 ,2 , Z . M . Y ang 2 , K . W ang 1 1 Dep artment o f G rassland Science , China A gricultural University , 2 Y uan M ing Y uan X ilu , Beij ing , 100094 P .R . 倡 China ;2 Heilongj iang A ugust f irst reclamation university , Daqing ,Heilongj iang ,163319 , P .R . China , corresponding author , E‐mail : w angkun＠ cau .edu .cn

Key words : lactea chinensis , Iris .var . seedling , emergence , survival , vegetations Introduction I . lactea population became dominant during the process of grassland succession１９w８h５en２g０r０a０ssland was overgrazed . In general , good vegetation can restraiIn.sleaecdtegaermination and seedling survival ( Fenner M , , ) . In this experience , we would find how seed germinate of and seedling survive in different vegetation condition . Material and method I . lactea ２００５ seed１s０were collected from wild stands growing in the Guyuan Rangland of Heibei in S＝ep１temb３er . Capsules were air dried for d to release see１d５s０and seeds wer０e℃stratified wit２h００s６and and water ( seed to sand to ) outdoors during４ ℃winter , which had a period of over days below . On June , seeds were picked up and stored in refrigerator at . The experim１ent was conducted in a randomised complete block de３sign consisting of four seedbed treatments and five replicates : a control , A , ( undis２t０urbed vegetation) ; a removal treatment , A , ( cutting out the existing‐vegetation and digg‐ing out the plant roots to a depth of cm , then th２e soil‐were backfilled) and two cutting‐treatments ( pre sowing‐cutting only cutting the existing vegetation at ground level , A ; pre sowing cutting followed４ by post sowing interval cutting cutt４ing the existing veg１e０t０at×io１n００at gr２ound level and keep the existing veget５a０tion to a height ２o０f cm２００p６rio２r０t０o the growing season , A ) . Each plot was cm and the distance between plots was cm . On July th , , seeds were sown into each plot .

Figure 2 E f f ects o f di f f erent vegetation Figure 1 E ff ects o f di f f erent vegetation treatments on seedling surv iv al o f treatments on seedling emergence o f I . lactea . I . Lactea .

Results ５０ ２３％ ３ Seedlings emerged after d１ays of sowing . Seedling emergence ( ) in the removal tre４a０tment ( A ) w２ as higher than the other three treatments ( Figure ) . Seedling survived after counting seedling emerge percent d as Figure . The removal treatment also resulted in the highest seedling survival . Conclusions The removal treatment significantly improve seedling emergence and survival . This may be due to both improved soil water and gas condition and reduced root allelopathy of other . The control also improved seedling survival . It may be due to reduced seedling transpiration . References Chapman and H all , １９８５ ８７‐１０２ Fenner M . seed ecology : germination . London New York : : . ２nd .London New York : CA B International ２０００ ２３７‐ Fe３n３n０er M . Seeds : the ecology of regeneration in plant communities ( ) , , .

Grasslands/Rangelands Production Systems——— Seed Science and Technology