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[1]彭 艳 杨万勤 薛 樵 李 俊 王 滨 谭 波 吴福忠**.季节性冻融期间土壤动物对高山草甸两种凋落叶木质素降解的影响[J].应用与环境生物学报,2016,22(02):300-306.[doi:10.3724/SP.J.1145.2015.06029]
 PENG Yan,YANG Wanqin,XUE Qiao,et al.Impact of soil fauna on lignin degradation of two foliar litters in an alpinemeadow during freezing-thawing period*[J].Chinese Journal of Applied & Environmental Biology,2016,22(02):300-306.[doi:10.3724/SP.J.1145.2015.06029]
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季节性冻融期间土壤动物对高山草甸两种凋落叶木质素降解的影响()
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《应用与环境生物学报》[ISSN:1006-687X/CN:51-1482/Q]

卷:
22卷
期数:
2016年02期
页码:
300-306
栏目:
研究论文
出版日期:
2016-04-25

文章信息/Info

Title:
Impact of soil fauna on lignin degradation of two foliar litters in an alpinemeadow during freezing-thawing period*
作者:
彭 艳1 杨万勤1 薛 樵2 李 俊1 王 滨1 谭 波1 吴福忠1**
1四川农业大学生态林业研究所,四川省林业生态工程重点实验室,高山森林生态系统定位研究站 成都 6111302理县林业局 理县 623100
Author(s):
PENG Yan1 YANG Wanqin1 XUE Qiao2 LI Jun1 WANG Bin1 TAN Bo1 & WU Fuzhong1**
1Long-term Research Station of Alpine Forest Ecosystem, Key Laboratory of Ecological Forestry Engineering, Institute of Ecology and Forestry,Sichuan Agriculture University, Chengdu 611130, China2Lixian Forestry Bureau, Lixian 623100, China
关键词:
高寒生态系统木质素降解凋落物分解季节性冻融土壤动物
Keywords:
cold biomes lignin degradation litter decomposition seasonal freezing-thawing soil fauna
分类号:
Q148
DOI:
10.3724/SP.J.1145.2015.06029
摘要:
高山草甸冻融季节强烈的冻结作用和频繁的冻融循环可促进凋落叶木质素降解,进而影响凋落叶分解及其相关的物质循环过程,但严酷环境下仍然活跃的土壤动物是否具有明显的作用尚无定论. 因此,以高山草甸代表性植物黄花亚菊(Ajania nubigena)和黑褐苔草(Carex atrofusca)凋落叶为研究对象,采用不同孔径凋落叶袋排除土壤动物的方法,探讨冬季不同冻融时期(冻结前期、冻结期和融化期)土壤动物对凋落叶木质素降解的贡献. 结果显示,整个季节性冻融期间,土壤动物对凋落叶中木质素的降解具有明显的贡献. 土壤动物作用的凋落叶木质素降解率(Cfau)为19.41%(黄花亚菊凋落叶)和2.02%(黑褐苔草凋落叶),总贡献率(Pfau)为32.47%(黄花亚菊凋落叶)和2.33%(黑褐苔草凋落叶). 然而不同时期土壤动物具有不同程度的影响. 相对于其他时期,冻结初期土壤动物作用于黑褐苔草凋落叶木质素降解率最大(13.59%),而融化期最小(-0.27%). 与黑褐苔草不同,融化期土壤动物作用于黄花亚菊凋落叶木质素降解率最大(17.59%),而在冻结期最小(-5.12%). 土壤动物作用于凋落叶木质素的降解率和贡献率均与负积温显著正相关(P < 0.05),与凋落叶初始质量无显著相关性. 可见,高寒草甸土壤动物在严酷的冬季环境下仍然对凋落叶木质素降解具有积极的作用,但相对于凋落叶质量,温度及其相关冻融环境的改变对土壤动物作用于木质素降解过程的影响更大. (图6 表4 参40)
Abstract:
Strong freezing and frequent freeze-thaw cycles could accelerate lignin degradation during litter decomposition inalpine meadow during the seasonal freezing-thawing period, which plays an important role in keeping circulation of materialsand the balance of ecosystem nutrients. However, little information is currently available about whether soil fauna has obviouseffects on lignin degradation under the crucial environment conditions during the freezing-thawing period in alpine meadow.Using litterbags with different mesh sizes, we conducted a field experiment to investigate the contribution of soil fauna tolignin degradation of two foliar litters in the freezing-thawing period in an alpine meadow on the eastern Tibetan Plateau. Thepredominant plants were Ajania nubigena and Carex atrofusca, and the litterbags were sampled in the pre-freezing period, thefreezing period and the thawing period from November 2013 to April 2014. Soil fauna showed an obvious effect on the lignindegradation of foliar litter in the alpine meadow over the freezing-thawing period. The lignin degradation rate of A. nubigenaand C. atrofusca foliar litter driven by soil fauna (Cfau) was 19.41% and 2.02%, respectively, with the corresponding contributionrate of soil fauna to litter lignin degradation rate (Pfau) as 32.47% for A. nubigena, and 2.33% for C. atrofusca. However, theeffect of soil fauna to litter lignin degradation was different in different freezing-thawing stages. Among all, the thawingperiod showed the highest lignin degradation rate of A. nubigena foliar litter driven by soil fauna (17.59%), and the freezingperiod (-5.12%) the lowest one. In contrast, lignin degradation rate of C. atrofusca foliar litter (13.59%) was the highest in thepre-freezing period, but the lowest in the thawing period (-0.27%). Additionally, Cfau and Pfau were significantly correlatedwith negative accumulated temperature (P < 0.05), but insignificantly with the initial litter quality. These results suggested thatsoil fauna obviously affect lignin degradation during foliar litter decomposition in winter; the temperature and freeze-thawdynamics could have greater impact than the litter quality on the lignin degradation processes in the alpine meadow.

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更新日期/Last Update: 2016-04-25