摘要
通过对阔叶红松林和红松人工林2种林型凋落物处理(分别为不添加凋落物(原样组)、添加凋落物(双倍组)和去除凋落物(去除组)等3个处理)与模拟氮磷沉降(分别为对照CK(0 g N m^(-2)a^(-1)、0 g P m^(-2)a^(-1))、低浓度氮磷(5 g N m^(-2)a^(-1)、5 g P m^(-2)a^(-1))、中浓度氮磷(15 g N m^(-2)a^(-1)、10g P m^(-2)a^(-1))和高浓度氮磷(30 g N m^(-2)a^(-1)、20 g P m^(-2)a^(-1))等4个强度)原位培养试验,研究凋落物质量的增加与氮磷沉降及两种处理的耦合作用对碳(C)和木质素分解释放的影响。结果表明:凋落物添加在试验前期(6月)抑制人工林L层的C释放,促进H层的C释放;试验后期(10月)促进人工林L层C释放,而抑制H层的C释放。凋落物添加在前期(6月)是促进天然林L层C释放的,但在后期(10月)产生抑制作用。与L层相反,凋落物添加持续促进天然林H层的C释放。低、中浓度氮磷沉降显著促进了红松人工林和阔叶红松林L、H层C释放和木质素降解,但高浓度的氮磷添加会抑制C释放和木质素的降解,两种处理之间无交互作用。
Broad-leaved Pinus koraiensis forest and Pinus koraiensis plantation were used as objects to carry out in-situ culture experiment through litter treatment and simulated nitrogen and phosphorus deposition.Litter treatments were divided into three treatments:no litter(original group),adding litter(double group)and removing litter(removal group).The simulated nitrogen and phosphorus deposition were as follows:Control CK(0 g N m^(-2)a^(-1),0 g P m^(-2)a^(-1)),low concentration N and P(5 g N m^(-2)a^(-1),5 g P m^(-2)a^(-1)),medium concentration N and P(15 g N m^(-2)a^(-1),10g P m^(-2)a^(-1))and high concentration N and P(30 g N m^(-2)a^(-1),20 g P m^(-2)a^(-1)),respectively.The purpose of the experiment was to study the effects of the increase of litter mass,nitrogen and phosphorus deposition and the coupling effect of the two treatments on the decomposition and release of carbon(C)and lignin.The results showed that in the early stage of the experiment(June),the addition of litter inhibited the C release of L layer and promoted the C release of H layer of plantation,while in the later stage of the experiment(October),it promoted the C release of L layer of plantation,but inhibited the C release of H layer.The addition of litter promoted the release of C from L layer of natural forest in the early stage(June),but had an inhibitory effect in the later stage(October).In contrast to the L layer,the addition of litter continued to promote the release of C from the H layer of the natural forest.Low and middle nitrogen and phosphorus deposition significantly promoted C release and lignin degradation in L and H layers of plantation and natural forest,but high concentration of nitrogen and phosphorus could inhibit C release and lignin degradation.There is no interaction between the two treatments.
作者
郭绮雯
段文标
刘玉萍
陈立新
李常准
于颖颖
李少然
李亦菲
GUO Qiwen;DUAN Wenbiao;LIU Yuping;CHEN Lixin;LI Changzhun;YU Yingying;LI Shaoran;LI Yifei(College of Forestry,Northeast Forestry University,Harbin 150040,China)
出处
《生态学报》
CAS
CSCD
北大核心
2021年第16期6621-6632,共12页
Acta Ecologica Sinica
基金
国家自然科学基金(31770656,31670627)。
关键词
凋落物
木质素
碳释放
红松
氮磷沉降
凋落物添加
litter
lignin
carbon release
Pinus koraiensis
nitrogen and phosphorus deposition
litter addition
