滇中亚高山人工林凋落物分解对模拟氮沉降的响应

doi:10.13287/j.1001-9332.202008.034

应用生态学报 ›› 2020, Vol. 31 ›› Issue (8): 2523-2532.doi: 10.13287/j.1001-9332.202008.034

滇中亚高山人工林凋落物分解对模拟氮沉降的响应

张雨鉴, 宋娅丽, 王克勤^*, 杨晓雨, 邢进梅, 张转敏

西南林业大学生态与环境学院, 昆明 650224

收稿日期:2019-11-23 修回日期:2020-05-11 出版日期:2020-08-15 发布日期:2021-02-15
通讯作者: * E-mail: wangkeqin7389@sina.com
作者简介:张雨鉴, 男, 1994年生, 硕士研究生。主要从事森林生态系统与功能研究。E-mail: kotenbu@163.com
基金资助:
云南省高校优势特色重点学科(生态学)建设项目和国家林业和草原局林业科技创新平台运行项目“云南玉溪森林生态系统国家定位观测研究站”(2019132161)资助

Responses of litter decomposition in two subalpine plantations to simulated nitrogen deposition in central Yunnan, China

ZHANG Yu-jian, SONG Ya-li, WANG Ke-qin^*, YANG Xiao-yu, XING Jin-mei, ZHANG Zhuan-min

College of Ecology and Environment, Southwest Forestry University, Kunming 650224, China

Received:2019-11-23 Revised:2020-05-11 Online:2020-08-15 Published:2021-02-15
Supported by:
This work was supported by the University's Advantageous Key Discipline (Ecology) Construction Program of Yunnan Province and the National Forestry and Grassland Bureau Forestry Science and Technology Innovation Platform Operation Program “National Forestry Ecosystem Positioning Observation and Research Station of Yuxi City, Yunnan Province” (2019132161).

摘要/Abstract

摘要： 2018年2月至2019年1月,利用尼龙网袋法对滇中亚高山华山松和云南松两种人工林开展模拟氮(N)沉降下凋落叶和凋落枝原位分解试验,N沉降水平分别为对照(CK, 0 g N·m^-2·a^-1)、低N(LN, 5 g N·m^-2·a^-1)、中N(MN, 15 g N·m^-2·a^-1)和高N(HN, 30 g N·m^-2·a^-1)。结果表明: 华山松凋落叶和凋落枝年分解率分别为34.8%和18.0%,分别高于云南松凋落叶的32.2%和凋落枝的16.1%。模拟N沉降下,LN处理使华山松凋落叶、枝分解95%所需时间较对照分别减少0.202和1.624年,MN处理分别减少0.045和1.437年,HN处理则分别增加0.840和2.112年;LN处理使云南松凋落叶、枝分解95%所需时间较对照分别减少0.766和4.053年,MN处理分别增加0.366和0.455年,HN处理分别增加0.826和0.906年。经过1年的分解,低N处理促进了华山松和云南松凋落物(叶、枝)的分解,而高N处理表现为抑制作用;N沉降对两种林型凋落物分解的影响与凋落物中纤维素和木质素含量密切相关。可见,凋落物基质质量在一定程度上决定了凋落物分解对N沉降的响应情况,尤其是纤维素和木质素含量。

关键词: 氮沉降, 纤维素, 木质素, 凋落叶, 凋落枝, 华山松, 云南松

Abstract: From February 2018 to January 2019, a field experiment of simulated nitrogen (N) depo-sition was conducted in Pinus armandii and Pinus yunnanensis plantations in the subalpine region of central Yunnan, China. The litterbag method was used for in situ litter (leaf and twig) decomposition experiment in both plantations. Four levels of N addition were applied, i.e., control (CK, 0 g N·m^-2·a^-1), low nitrogen (LN, 5 g N·m^-2·a^-1), medium nitrogen (MN, 15 g N·m^-2·a^-1), and high nitrogen (HN, 30 g N·m^-2·a^-1). The results showed that the annual decomposition rates of leaf and twig in P. armandii were 34.8% and 18.0%, which were higher than the 32.2% (leaf) and 16.1% (twig) in P. yunnanensis. Under N deposition, the LN treatment reduced the time of 95% mass loss of leaf and twig litter in P. armandii by 0.202 and 1.624 years, the MN treatment reduced by 0.045 and 1.437 years, and the HN treatment increased by 0.840 and 2.112 years, respectively. In the P. yunnanensis plantation, the LN treatment reduced the time of 95% mass loss of leaf and twig litter by 0.766 and 4.053 years, while the MN treatment increased by 0.366 and 0.455 years, and the HN treatment increased by 0.826 and 0.906 years, respectively. Litter (leaf and twig) decomposition of both P. armandii and P. yunnanensis were promoted by low N treatment and inhibited by high N treatment. The effects of N deposition on litter decomposition of two plantations were significantly correlated with the contents of cellulose and lignin in litter. In conclusion, the responses of litter decomposition to N deposition mainly depended on the litter substrate, especially cellulose and lignin contents.

Key words: nitrogen deposition, cellulose, lignin, leaf litter, twig litter, Pinus armandii, Pinus yunnanensis

张雨鉴, 宋娅丽, 王克勤, 杨晓雨, 邢进梅, 张转敏. 滇中亚高山人工林凋落物分解对模拟氮沉降的响应[J]. 应用生态学报, 2020, 31(8): 2523-2532.

ZHANG Yu-jian, SONG Ya-li, WANG Ke-qin, YANG Xiao-yu, XING Jin-mei, ZHANG Zhuan-min. Responses of litter decomposition in two subalpine plantations to simulated nitrogen deposition in central Yunnan, China[J]. Chinese Journal of Applied Ecology, 2020, 31(8): 2523-2532.

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滇中亚高山人工林凋落物分解对模拟氮沉降的响应

Responses of litter decomposition in two subalpine plantations to simulated nitrogen deposition in central Yunnan, China

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