增温和施氮对小兴安岭叶凋落物分解的影响

doi:10.11924/j.issn.1000-6850.casb19010132

中国农学通报 ›› 2020, Vol. 36 ›› Issue (14): 46-53.doi: 10.11924/j.issn.1000-6850.casb19010132

增温和施氮对小兴安岭叶凋落物分解的影响

徐萌, 王庆贵, 闫国永, 邢亚娟()

黑龙江大学农业资源与环境学院,哈尔滨 150080

收稿日期:2019-01-26 修回日期:2019-04-08 出版日期:2020-05-15 发布日期:2020-05-20
通讯作者: 邢亚娟
作者简介:徐萌,女,1996年出生,山西长治人,在读硕士,研究方向：气候变化与凋落物分解。通信地址：150000 黑龙江大学农业资源与环境学院,E-mail： 2505794130@qq.com。
基金资助:
国家自然科学基金“阔叶红松林生态系统土壤碳循环对增氮和减水交互作用的响应”(41773075);“大兴安岭北方森林细根动态和形态特征对氮沉降的响应”(41575137);“大兴安岭北方森林生态系统对N沉降增加的响应”(31370494);“小兴安岭阔叶红松林生态系统对N沉降增加的响应”(31170421);科技部基础性工作专项A类项目“东北森林国家级保护区及毗邻区植物群落和土壤生物调查”(2014FY110600)

Warming and Nitrogen Application: Effects on Decomposition of Leaf Litter in the Less Khingan Mountains

Xu Meng, Wang Qinggui, Yan Guoyong, Xing Yajuan()

College of Agricultural Resource and Environment, Heilongjiang University, Harbin 150080

Received:2019-01-26 Revised:2019-04-08 Online:2020-05-15 Published:2020-05-20
Contact: Xing Yajuan

摘要/Abstract

摘要：

为研究小兴安岭叶凋落物对温度升高、氮沉降及其交互作用的响应。试验采用空间移位方法,进行施氮(LN)、增温(WT)、施氮增温(WLN)和对照(CK)4种处理。结果表明：（1）氮沉降对叶凋落物分解的作用表现为先抑制后逐渐促进,在第1年冻融期后抑制显著(P<0.05);（2）温度升高情况下,第1年生长季较对照相比显著减缓了凋落叶分解(13.8%),显著加快了第2年生长季凋落叶的分解(9.4%);（3）施氮增温共同驱动下凋落物分解情况与增温处理一致,均表现为先抑制后促进;（4）各处理凋落物质量损失率与元素释放率较对照相比皆表现为先抑制后促进,不同处理的叶凋落物质量损失率为LN(55.2%)>WT(54.4%)>WLN(53.4%)>CK(53.2%)。本研究表明：施氮、增温及交互作用对叶凋落物分解均表现为初期抑制、然后加速叶凋落物的分解,与长白山相比,小兴安岭叶凋落物分解对施氮处理的响应更加敏感。

关键词: 凋落物分解, 氮沉降, 增温, 叶凋落物, 质量损失率, 释放率

Abstract:

The paper aims to study the response of leaf litter in the Lesser Khingan Mountains to temperature rise, nitrogen deposition and their interaction. We designed 4 kinds of treatments [nitrogen addition (LN), warming (WT), interaction of nitrogen addition and temperature increase (WLN) and control (CK)] by using the spatial shift method. The results showed that: (1) the effect of nitrogen deposition on leaf litter decomposition was first inhibition and then gradual promotion, and the inhibition was significant after the first year of freezing and thawing (P<0.05); (2) under the condition of temperature increase, the leaf litter decomposition of the first year’s growth season was significantly slowed down (by 13.8%) compared with the control, and the leaf litter decomposition of the second year’s growth season was significantly accelerated (by 9.4%); (3) the litter decomposition under the combined driving of nitrogen and temperature was consistent with the warming treatment, and both of them showed first inhibition and then promotion; (4) the mass loss rate and element release rate of each treatment were firstly inhibited and then promoted compared with the control, and the mass loss rate of leaf litter of different treatments was LN (55.2%)>WT (54.4%)>WLN (53.4%)>CK (53.2%). The study shows that the decomposition of leaf litter is initially inhibited by nitrogen application, temperature increase and interaction, and then accelerated, compared with Changbai Mountains, the decomposition of leaf litter in the Lesser Khingan Mountains is more sensitive to nitrogen addition.

Key words: litter decomposition, nitrogen deposition, warming, leaf litter, mass loss rate, release rate

中图分类号:

X171.1

徐萌, 王庆贵, 闫国永, 邢亚娟. 增温和施氮对小兴安岭叶凋落物分解的影响[J]. 中国农学通报, 2020, 36(14): 46-53.

Xu Meng, Wang Qinggui, Yan Guoyong, Xing Yajuan. Warming and Nitrogen Application: Effects on Decomposition of Leaf Litter in the Less Khingan Mountains[J]. Chinese Agricultural Science Bulletin, 2020, 36(14): 46-53.

图/表 8

图1. 施氮情况下凋落叶质量剩余百分率 *表示处理与对照间差异显著(P<0.05)。下同

图2. 施氮情况下凋落叶元素积累释放百分率

图3. 增温情况下凋落叶质量剩余百分率

图4. 施氮情况下温度升高凋落叶质量剩余百分率

图5. 增温情况下凋落叶元素积累释放百分率

图6. 增温施氮协同作用下凋落叶质量剩余百分率

图7. 增温施氮协同作用下凋落叶元素积累释放百分率

处理方式	初始质量	2年后剩余质量
CK	5.000±0.000A	2.34±0.35A
LN	5.000±0.000A	2.24±0.23A
WT	5.000±0.000A	2.28±0.13A
WLN	5.000±0.000A	2.33±0.19A

表1. 不同处理下混叶凋落物初始质量及2年后剩余质量 g

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增温和施氮对小兴安岭叶凋落物分解的影响

Warming and Nitrogen Application: Effects on Decomposition of Leaf Litter in the Less Khingan Mountains

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