Bao, Yajing

Li, Zhenghai

English

University of Kentucky

University of Kentucky UKnowledge International Grassland Congress Proceedings 21st International Grassland Congress / 8th International Rangeland Congress The Caloric Values of Main Plant Species and Functional Groups in the Steppe Communities of Xilin River Basin Yajing Bao Dalian Nationalities University, China Zhenghai Li Dalian Nationalities 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/21/1-4/19 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 ]168　 瞯 　 Multifunctional Grasslands in a Changing World 　 Volume Ⅰ 　Grasslands/Rangelands Resources and Ecology ——— Ecology of Grasslands/RangelandsThe caloric values of main plant species and functional groups in the steppe communities of XilinRiver BasinBAO Y a‐Jing L I Zheng‐HaiCollege o f L i f e Science , Dalian Nationalities University , １８ L iaohe West Road , Dalian Economic & Technical DevelopmentZone , L iaoning １１６６００ , Peop le摧s Republic o f China . E‐mail : by j＠ dlnu .edu .cnKey words :Xilin River Basin , the caloric value , plant functional groups ,steppe community , plant speciesIntroductions The caloric value is a useful parameter which has been broadly employed to measure the energy budgets throughan ecosystem ( Ren et al . , １９９９ ) , as well as to assess the photosynthetic efficiency of plants and to identify the allocation ofenergy storage within different organisms of plants . The objective of this study was to detect variations of caloric value ofdominant species and functional groups in total １２ sites in the steppe communities of Xilin River Basin , Inner Mongolia .Materials and methods Caloric values of main plant population were investigated in Xilin River Basin , Inner Mongolia The studywas based on field surveys of the standing vegetation in two typical steppes respectively dominated by L . chinensis or S .grandis and one meadow steppe dominated by L . chinensis including of four degraded intensities sites ( undegraded , relativelylight , moderate and heavy degraded) in each steppe types Aboveground part was sampled in terms of different species fromabove １２ sites from １８ July to １０ August ２００２ , and then oven dried at ６０ ℃ to constant weight . The caloric determinationswere made of each sample using a Parr １２８１ oxygen bomb calorimeter , The caloric value was analyzed for species groupedaccording to their life form , family and water ecological types .Results The mean caloric value of ６０ species , taking into account three steppe types and four grazing degraded intensitiesstudied , was １７ .２５ ± ０ .９２ kJ g‐１ with a CV of ５ .４％ . Among them , a annual forbs , Salsola collina (１３畅１２ ± １ .０９ kJ g‐１ ) hada significant lower caloric value than other species ( Figure １ ) . Shrub had the highest value among groups classified by lifeforms . The mean of perennial grasses was significant higher than that of annuals and biennials ( p ＜ ０ .０５ ) , the subshrubs andperennial forbs were in the midst . No statistically significant differences were found among the caloric values of the differentplant groups based on water ecological types include of xerophytes , mesoxerophytes , xeromesophytes and mesophytes .Different families showed apparent difference in caloric value . The higher caloric values were found in Gramineae , Leguminosaeand Compositae , while Chenopodiaceae has the lowest value ( Figure ２) .Figure 1 Frequency distributions o fthe number o f species by caloricv alue classes o f major p lant speciesin the step pe o f X ilin River Basin .　 　 　Figure 2 Mean caloric v alue ( ± SD) f or di f f erent p lant group ing in step peo f X ilin River Basin . Di f f erent letters rep resent signi f icant di f f erencesamong means ( P ＜ 0 .05 , A NOVA Duncan test ) . The number in the barrep resent the number o f species in cor responding group ing .１)Based on life form . A : annual and biennials , SS : subshrubs , PF : perennial forbs , PG : perennial grasses , S : shrubs .２)Based on water ecological types . X : xerophytes , MX : mesoxerophytes , XM : xeromesophytes , M : mesophytes .３)Based on family . Che : Chenopodiaceae , Car : Caryophyllaceae , Ros : Rosaceae , Ran : Ranunculaceae , Lil : liliaceae , Com :Compositae , Leg : Leguminosae , Gra : Gramineae .20 18 16 "'14 -~ 12 2110 (/) 8 0 L,_L ____ .,._.ae;:::1-,__j_ __ L,__L __ 13.0 13.5 14.014.515.015.516.016.517.017.518.018.5 Energy( kj/g) 19 ~ 18 ;;:: 2' 17 (]) C LU 16 15 a A 19 18 ~ 17 ;;:: 2' (]) 16 C LU 15 b ab ab 8 2 48 ss PF PG s 1) Che Car Ros 19 a ~ a a :;c 18 a ;;:: 2' (]) 17 C w 21 4 16 15 X MX XM M 2) d d bed cd cd 5 7 7 12 Ran Lil Com Leg Gra 3) 

The Caloric Values of Main Plant Species and Functional Groups in the Steppe Communities of Xilin River Basin

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The Caloric Values of Main Plant Species and Functional Groups in the Steppe Communities of Xilin River Basin

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