摘要
选择锡林浩特东部国家气候观象台的生态监测研究样地,对大针茅(Stipa grandis)、羊草(Leymus chinensis)、糙隐子草(Cleistogenes squarrosa)、知母(Anemarrhena asphodeloides)枯落物的化学结构特征进行阐释。结果表明:(1)枯落物分解速率呈先增大后减小的变化趋势,且知母枯落物分解速率高于大针茅、羊草和糙隐子草;枯落物总碳(TC)含量为富集-释放模式,在第120d时,知母枯落物TC含量高于其他3种植物。(2)大针茅、羊草、知母、糙隐子草枯落物所含的主要官能团为-OH;=C-H、-CH 2、-CH 3;C=O;C=O、C=C;C-O。(3)不同植物枯落物官能团含量在分解初期迅速减少,在分解后期减少趋势较为缓慢,与分解过程中枯落物的分解速率变化趋势一致;知母的含碳官能团含量在分解结束后最低,而羊草的则最大,且知母和糙隐子草损失量最大,与分解过程中枯落物TC含量的特征一致。(4)大针茅的支链化指数最大,羊草的最小;糙隐子草的芳香性指数最大,知母的最小。不同植物芳香性指数在分解初期迅速减少,在分解后期减少趋势较为缓慢,与分解速率变化趋势一致。
The chemical structure characteristics of four plant withered litters(Stipa grandis,Leymus chinensis,Cleistogenes squarrosa and Anemarrhena asphodeloides)were studied at the ecological monitoring research plots of the National Climate Observatory in the eastern part of Xilinhot.The results showed that:(1)The decomposition rate of withered litters of the four plants increased first and then decreased that the decomposition rate of withered litters in A.asphodeloides was higher than that of S.grandis,L.chinensis and C.squarrosa.The total carbon(TC)content of withered litters of the four plants followed the enrichment-release mode that the TC content of withered litters in A.asphodeloides was higher than that of other plant withered litters after 120 days.(2)The main functional groups in withered litters of S.grandis,L.chinensis,A.asphodeloides and C.squarrosa were-OH;=C-H,-CH 2,-CH 3;C=O;C=O、C=C and C-O.(3)The content of functional groups of withered litters in different plants decreased rapidly in the initial stage of decomposition,and the decreasing trend was slower in the later stage of decomposition,which was consistent with the change of the decomposition rate of withered litters.At the end of the decomposition,the content of carbon-containing functional groups was the lowest in A.asphodeloides and highest in L.chinensis,respectively.The loss of the content of carbon-containing functional groups in A.asphodeloides and C.squarrosa was the largest,which was consistent with the characteristics of TC content in withered litters during decomposition.(4)The branched-chain index(CH 3/CH 2)of S.grandis was the largest,and that of L.chinensis was the smallest.The aromaticity index of C.squarrosa was the largest,and that of A.asphodeloides was the smallest.The aromaticity index of different plant withered litters decreased rapidly in the initial stage of decomposition,and the decreasing was relatively slow in the later stage of decomposition,which was consistent with the change of decomposition rate.
作者
乔羽
刘华民
王建
寇欣
曹晓霭
温璐
梁存柱
赵玲
王立新
QIAO Yu;LIU Hua-min;WANG Jian;KOU Xin;CAO Xiao-ai;WEN Lu;LIANG Cun-zhu;ZHAO Ling;WANG Li-xin(School of Ecology and Environment,Inner Mongolia University,Hohhot 010021,China;Collaborative Innovation Center for Grassland Ecological Security(Jointly Supported by the Ministry of Education and Inner Mongolia Autonomous Region),Hohhot 010021,China;Key Laboratory of Ecology and Resource Use of the Mongolian Plateau of Ministry of Education,Hohhot 010021,China)
出处
《中国草地学报》
CSCD
北大核心
2021年第4期61-70,共10页
Chinese Journal of Grassland
基金
内蒙古科技重大专项项目(ZDZX2018054)
国家自然科学基金项目(31560146)
内蒙古科技计划项目(201802100)资助。
关键词
枯落物分解
红外光谱
官能团
芳香性
支链化
Withered litter decomposition
Infrared spectrum,Functional groups
Aromaticity
Branched-chain
