Bi, Y. F.

Zhang, J. L.

English

University of Kentucky

University of Kentucky UKnowledge International Grassland Congress Proceedings 21st International Grassland Congress / 8th International Rangeland Congress Relationship of Soil Seed Bank and Vegetation in Hot‐Dry Valley Grassland of Jin‐Sha River J. L. Zhang Yunnan Agriculture University, China Y. F. Bi Yunnan Agriculture 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/21/1-4/6 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. 　 Multifunctional Grasslands in a Changing World 　 Volume Ⅰ 　 瞯 ]155　 瞯Grasslands/Rangelands Resources and Ecology ——— Ecology of Grasslands/RangelandsRelationship of soil seed bank and vegetation in Hot‐Dry Valley grassland of Jin‐Sha RiverJ .L .Zhang , Y .F .Bi 倡College o f A nimal Science , Y unnan A gricultural University , K unming 650201 , China . E‐mail :z hang j l‐z＠ １６３ .comKeywords : Hot‐Dry Valley , enclosure grassland , soil seed bank , vegetation ,regressionIntroduction The soil seed bank means the vigorous seeds existing in the soil surface , or buried in the soil , duff or litter , in thecertain period and place ( Andreza ,M .M . and Vera ,L .E .２００７ ) . Soil seed bank plays an important role in the communitycomposition and vegetation evolution . Although soil seed bank have been the subject of much recent attention , little is knownabout the relationship of the soil seed bank and vegetation in Hot‐Dry Valley摧s grassland of Jin‐Sha River and understanding ofhow these interact to determine the importance of soil seed bank to vegetation ecosystem摧s succession is limited ( Luo H . andWang K .Q .２００６ ) .Materials and methods The study was conducted in Yongsheng county of Yunnan province . The mean annual temperature is２２ ℃ and the mean annual rainfall ８９１ mm . The most rain fall during June to October . The dry season is from November toMay . Soil is brown yellow with pH ６ .７ . The grassland is the typical �Savanna" . The representative degeneration grasslandwas enclosed on JinSha River Hot‐Dry Valley in ２００４ . Soil seed bank was sampled in March ２００５ and ２００６ . The randomsampling was used within each sampling region of enclosure and degeneration grassland ( as control ) . Nine plots were takenfrom each sampling region with three replicates square (２０ cm × ２０ cm) . Total soil samples were ２４３ . The sampling depth was５cm , total depth １５ cm in every sample square . Soil samples were sorted to eliminate plant fragments and stones and kept inventilating bags . Seed germination test began in April ２００６ . The soil samples were placed in greenhouse that temperaturesranging from １８ ℃ to ２５ ℃ . Each sample was spread out flowerpots (２５ cm) to the depth of ４cm over seedbed soil ( the soil waspreviously sterilized and killed seed by １５０ ℃ ) . All pots were watered as needed to keep the soil moist . The research ofvegetation began October ２００５ and ２００６ .Figure 1 Relationship between soil seedbank density and vegetation totaldensity .　 　Figure 2 Relationship between soil seed bank and vegetationdensity o f perennial and annual herbage . ( A : annual . P :perennial .)Results Seed bank and vegetation density values in this study were found increased significantly ( P ＜ ０ .００１ ) compared withother unclosed grassland . Regressions showed a significant relationship ( P＜ ０ .０１ ) between seed bank density and vegetationdensity when the data of individual species were analysed . Density of the seed bank varied with increasing density of vegetationcan be described by a quadratic curve ( Figure .１ ) . The perennial and annual herbage were analysed and the high perennialherbage seed bank density with the vegetation density showed the positive regression ( P ＜ ０ .０１ ) , but the short perennialherbage are negative regression ( P＜ ０ .０１) . However , the relationship of the seed bank density and vegetation were oppositevariation ( P＜ ０ .０１) of the annual herbage摧s seed density compared with the perennial herbage ( Figure .２) .Conclusions The results indicate that both of the soil seed bank and vegetation density have significant positive regression ongrassland . The perennial and annual herbage摧s seed bank and vegetation density have significant regression , which it depend oncharacteristics of vegetation form .ReferencesAndreza ,M .M . , Vera ,L .E . , ( ２００７ ) . Soil seed banks in tropical forest fragments with different disturbance histories insoutheastern Brazil . Ecological Engineering ３１(３ ) , １６５‐１７４ .Luo ,H . ,Wang ,K .Q . ,( ２００６ ) . Soil seed bank and above vegetation in jinshajiang Hot‐Dry River Valley Hillslope vegetationrestoration site . A cta Ecologica Sinica ２６ (８ ) , ２４３２‐３４４２ .~ 4000 NE :1500 y=-0. 0012x2+6. 9/1 x-2i'ii'i7 ul R2=0. ■ " "O 8i'i <I) 3000 .. ~ p 2500 ·;;; 2000 C: <I) ■ "O 1.500 ■ "O <I) 1000 .. <I) lfJ 500 ,550 6.50 750 850 950 10.50 Plant density (plants/m2) 900 750 600 ~ 450 ~~ :300 V, 150 "O <I) 0 <l) ~ >. -~ 700 ii3 600 "O "O 500 ::l 400 lfJ 3 00 200 100 Heteropogon contortus (P) y-0. 0009x'+o. 22x-60. :-): 1~ 2-0. 80 ■ 150 :11111 4511 600 750 900 Hulhostylisdensa (A) 6110 5110 4110 :300 200 JOO 0 250 200 150 JOO 50 Oxalis corniculata (P) y - .'323. 17!:' 10 15 211 25 :rn :\5 40 45 Bidens pilosa (A) y--2. 6f:ix+10f:i. 12 F::-0. 26 30 60 90 120 0 10 20 :30 ·10 50 Plant density (plants/m 2) 

Relationship of Soil Seed Bank and Vegetation in Hot‐Dry Valley Grassland of Jin‐Sha River

https://uknowledge.uky.edu/cgi/viewcontent.cgi?article=2334&amp;context=igc

Relationship of Soil Seed Bank and Vegetation in Hot‐Dry Valley Grassland of Jin‐Sha River

Abstract

Similar works

Full text

Available Versions

University of Kentucky