Non-additive effects of mixed decomposition of coniferous and broad-leaved species litter on the release of phenolics
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 conif-erous 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 con-stant 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-solu-ble 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 an-tagonistic 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 other mixtures,coniferous and broad-leaved litters tended to sig-nificantly inhibit condensed tannins release of each other(P＜0.05).
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