氮沉降和干旱对阔叶红松林凋落物分解的影响

郑俊强; 郭瑞红; 李东升; 李东; 李金功; 朱保坤; 韩士杰

doi:10.13332/j.1000-1522.20150464

氮沉降和干旱对阔叶红松林凋落物分解的影响

1.
1 中国科学院沈阳应用生态研究所
2.
2 盘锦市芦苇科学研究所
3.
3 长白山自然保护管理中心
4.
4 东北师范大学环境学院

基金项目:

“973”国家重点基础研究发展计划项目(2011CB403202、2014CB954400)、国家自然科学基金项目(41173087、41330530)

详细信息

作者简介:
郑俊强,博士,副研究员。主要研究方向: 森林土壤生态。Email: zhjq79@yahoo.com 地址:110016辽宁省沈阳市沈河区文化路72号中国科学院沈阳应用生态研究所。
责任作者: 韩士杰,研究员,博士生导师。主要研究方向: 森林生态。Email: hansj@iae.ac.cn 地址:同上。

郑俊强,博士,副研究员。主要研究方向: 森林土壤生态。Email: zhjq79@yahoo.com 地址:110016辽宁省沈阳市沈河区文化路72号中国科学院沈阳应用生态研究所。
责任作者: 韩士杰,研究员,博士生导师。主要研究方向: 森林生态。Email: hansj@iae.ac.cn 地址:同上。

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出版历程
- 收稿日期: 2015-12-03
- 发布日期: 2016-04-29

Effects of nitrogen deposition and drought on litter decomposition in a temperate forest

1.
1 Institute of Applied Ecology, Chinese Academy of Sciences, 110164, Shenyang, Liaoning, P. R. China;
2.
2 Liaoning Institute of Wetland, Panjin City,Liaoning, 124000, P.R. China;
3.
3 Changbai Mountain Natural Conservation Administration Centre, 133613,Yanbian, Jilin, P.R. China;
4.
4 School of Environment, Northeast Normal University, 130117,Changchun, Jilin, P.R. China.

摘要

摘要: 氮沉降和降水减少耦合作用对我国北温带森林凋落物分解的影响还知之甚少,通过常规的凋落物分解袋法进行了对照(CK)、施氮(N, 50 kg/(hm·a))、降雨减少(RP,-30%)和降雨减少加施氮(RP+N)4个处理对长白山阔叶红松林主要树种叶凋落物分解和碳、氮元素动态影响的研究。结果表明:凋落物分解95%需要6.025～15.167年,椴树的分解速率最快,其次是蒙古栎,红松最慢,三者混合后分解率介于期间。分解系数结果显示:施氮能在一定程度上促进紫椴叶凋落物的分解, 施氮对红松凋落物和混合凋落物分解则表现出抑制作用, 降雨减少对分解表现为明显的抑制作用,干旱情况下施氮后4种凋落物的分解系数介乎氮沉降和降雨减少两者之间,说明氮沉降和降雨减少存在交互作用。总体看来,氮沉降对凋落物分解和氮元素含量有一定的影响,并且与分解阶段和凋落物种类有关,降水减少对凋落物分解和碳氮元素比值具有显著的抑制作用。
- 氮沉降 /
- 降水减少 /
- 凋落物分解 /
- 碳氮释放 /
- C/N /
- 阔叶红松林 /
- 长白山
Abstract: To study the responses of nitrogen (N) deposition and drought on litter decomposition, we conducted an in situ experiment in a broadleaf-Korean pine mixed forest in Changbai Mountains by using litterbag technique. Four treatments were installed, i.e., null level of N (CK), N addition (N, 50 kg N/(ha·a)), precipitation reduction (RP, -30%) and precipitation reduction combined with N addition (RP+N). The results showed that it would take 6.025 to 15.167 years to decompose 95% of mass of litter used. Among the tree species, Tilia amurensis (TA) had the highest decomposition rate, followed by Quercus mongolica (MQ), and Pinus koraiensis (PK) showed the lowest decomposition rate. After 92 d and 154 d, although the litter decomposition rate with N addition was higher than those with CK, no significant difference was found, whereas the decomposition rate of litter in RP and RP+N treatments was significantly lower than that of CK (P<, 0.05). But after 365 d and 457 d, the differences between RP, RP+N and CK were also significant. Compared with CK, N and drought treatments had a 42.64%-51.01% decrease of litter C/N ratio. As a whole, N deposition had no significant effects on litter decomposition and C and N concentration, but RP and RP+N significantly inhibited the litter decomposition, and C and N release.
- nitrogen deposition /
- reduce precipitation /
- litter decomposition /
- C and N /
- C/N ratio /
- broadleaf-Korean pine mixed forest /
- Changbai Mountains

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氮沉降和干旱对阔叶红松林凋落物分解的影响

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Effects of nitrogen deposition and drought on litter decomposition in a temperate forest

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