摘要
凋落物在分解过程中释放的酚类物质是植物影响其周边环境的主要媒介之一,然而凋落物混合分解对酚类物质释放的非加和性影响尚不清楚。本文以秦岭地区云杉、华北落叶松和华山松以及槭树、红桦和灰楸的凋落叶组成9种1∶1(w/w)针阔叶混合凋落物,采用分解袋法在室内条件(20~25℃、恒湿避光)下进行6个月的分解实验,研究针阔叶凋落物的存在对彼此水溶性酚和缩合单宁释放的影响。结果表明:(1)云槭和落槭凋落物混合分解初期对水溶性酚释放产生总体拮抗效应,但在试验后期转为产生总体协同效应,其中针阔叶凋落物在试验初期显著抑制彼此水溶性酚释放,随后转变为相互促进(P<0.05)。其余7种混合物分解时对水溶性酚释放产生总体拮抗效应(P<0.05),其中在云桦、云楸、落楸和落桦混合物中,针叶凋落物的水溶性酚释放由受到显著抑制转为受到显著促进(P<0.05)或不受影响(P>0.05),而在华桦、华楸和华槭混合物中,针叶凋落物的水溶性酚释放倾向于受到显著抑制(P<0.05)。在以上7种混合物中,阔叶凋落物的水溶性酚释放则普遍受到显著抑制(P<0.05)。(2)所有混合组合均对凋落物缩合单宁释放产生总体拮抗效应(P<0.05)。其中,落槭或落桦混合分解时,针叶凋落物的缩合单宁释放倾向于受到显著促进,阔叶凋落物分解则受到显著抑制(P<0.05);其余混合物中,针阔叶凋落物倾向于显著抑制彼此的缩合单宁释放(P<0.05)。
Litter-derived phenolics are one of the main media affecting the surrounding environment of trees.The effects of mixed decomposition induced non-additive effects on litter phenolics release remain unclear.To investigate how coniferous and broad-leaved species litter affects the release of phenolics from each other during the mixed decomposition,we created nine combinations of 1∶1(w/w) coniferous and broad-leaved mixed litters,with coniferous species litters of Picea asperata(Pa),Larix principis-rupprechtii(Lp),and Pinus armandii(Par),and broad-leaved species litters of Acer tsinglingens(At),Betula albosinensis(Ba),and Catalpa fargesii(Cf) from Qinling Mountains.Litter mixtures with litterbag were incubated under dark indoor condition at 20-25 ℃ and constant humidity for six months.The results showed that:(1) Pa + At combination and Lp + At combination firstly had antagonistic overall effect on water-soluble phenols release of litter mixture,and turned to synergistic effect at the late stage(P<0.05).Specifically,the mutual effects between coniferous and broad-leaved litter on water-soluble phenols release also exhibited a similar pattern to their combinations.The other seven litter combinations had antagonistic overall effect on water-soluble phenols release of litter mixture(P<0.05).For the mixtures of Pa + Ba,Pa + Cf,Lp + Cf,and Lp + Ba,the water-soluble phenols release of coniferous litter was firstly inhibited and then accelerated(P<0.05) or unchanged in the late stage.The release was significantly inhibited in the mixtures of Par + Ba,Par + Cf,and Par + At(P<0.05).Generally,the water-soluble phenols release of broad-leaved litters was significantly inhibited in the aforementioned seven mixtures(P<0.05).(2) All combinations had overall antagonistic effects on condensed tannins release of litter mixtures(P<0.05).In litter mixtures of Lp + At and Lp + Ba,the condensed tannins release of coniferous litter tended to be accelerated,while an opposite pattern was observed for the broad-leaved litters(P<0.05).In o
作者
张晓曦
刘凯旋
车文绒
胡嘉伟
李江文
田爽
ZHANG Xiaoxi;LIU Kaixuan;CHE Wenrong;HU Jiawei;LI Jiangwen;TIAN Shuang(College of Life Sciences,Shaanxi Engineering and Technological Research Center for Conservation and Utilization of Regional Biological Resources,Yan’an University,Yan’an 716100,Shaanxi,China)
出处
《生态学杂志》
CSCD
北大核心
2023年第12期2885-2894,共10页
Chinese Journal of Ecology
基金
国家自然科学基金项目(31800370)
延安大学科研计划资助项目(YDY2020-34)
国家大学生创新创业训练计划项目(S202010719013,202210719045)资助。
关键词
凋落物
酚类物质
混合分解
相互作用
非加和效应
litter
phenolic substance
mixed decomposition
mutual effect
non-additive effect
