Litter Decompositions of Three Dominant Plants in the Stipa baicalensis Grassland of Inner Mongolia

doi:10.11733/j.issn.1007-0435.2014.03.011

Acta Agrestia Sinica ›› 2014, Vol. 22 ›› Issue (3): 502-510.DOI: 10.11733/j.issn.1007-0435.2014.03.011

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Litter Decompositions of Three Dominant Plants in the Stipa baicalensis Grassland of Inner Mongolia

YU Wen-chao^1,2,3, ZHAO Jian-ning^2,3, LI Gang^2,3, XIU Wei-ming^2,3, ZHANG Gui-long^2,3, YANG Dian-lin^1,2,3

1. Department of Horticulture, Shenyang Agricultural University, Shenyang, Liaoning Province 110866, China;
2. Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China;
3. Key Laboratory of Original Agro-environment Quality of Ministry of Agriculture and Tianjin Key Laboratory of Agro-environment and Safe-product, Tianjin 300191, China

Received:2013-08-12 Revised:2013-11-01 Online:2014-06-15 Published:2014-06-04

内蒙古贝加尔针茅草原3种主要植物凋落物分解特征

于雯超^1,2,3, 赵建宁^2,3, 李刚^2,3, 修伟明^2,3, 张贵龙^2,3, 杨殿林^1,2,3

1. 沈阳农业大学园艺学院, 辽宁沈阳 110866;
2. 农业部环境保护科研监测所, 天津 300191;
3. 农业部产地环境质量重点实验室, 天津 300191

通讯作者: 杨殿林
作者简介:于雯超（1988- ），女，辽宁大连人，硕士研究生，主要开展草地生态恢复建设与保护研究，E-mail：leisituzi@163.com
基金资助:
国家自然科学基金项目（31170435）；“十二五”国家科技计划项目（2012BAD13B07）；中央级公益性科研院所基本科研业务费专项资金；农业部产地环境质量重点实验室/天津市农业环境与农产品安全重点实验室开放基金项目资助

Abstract

Abstract:

Litter decomposition is one of the key processes of energy flow and nutrient cycling in grassland ecosystems. The objectives of the present study are to explore the seasonal dynamics of both root and shoot litter decompositions of Stipa baicalensis, Leymus chinensis and Artemisia frigida in the Stipa baicalensis grassland of Inner Mongolia, China. The root tissues and aboveground litters (leaves and stems) of three different species were covered with litterbags. The litterbags were collected after 295, 356 and 417 days, then the mass losses and C, N, P and K contents of remaining litters were determined. The decomposition rates of litters had significant difference among tested plants. The decomposition of aboveground litter of S. baicalensis was faster than that of root tissue, whereas the decompositions of root tissues of both L. chinensis and A. frigida were slower than that of aboveground litters. The seasonal dynamics of decomposition rate of tested litters showed a single-peak curve with the maximum value in August. The decomposition rate of stem litter had significantly positive correlation with initial nitrogen, significantly negative correlation with initial carbon content and C/N ratio.

Key words: Decomposition rate, Nutrient dynamics, Root and shoot litter, Seasonal dynamics

摘要：

以内蒙古贝加尔针茅（Stipa baicalensis）草原3种主要植物贝加尔针茅、羊草（Leymus chinensis）和冷蒿（Artemisia frigida）为对象，采用分解袋法研究了3种不同植物器官（叶、茎、根）凋落物的分解速率和养分动态变化过程。结果表明：3种主要植物凋落物分解速率存在明显差异，贝加尔针茅叶凋落物分解快于根凋落物，羊草和冷蒿根凋落物分解快于叶和茎凋落物；3种主要植物凋落物分解季节动态呈单峰型曲线，在8月份时达最大值；羊草和冷蒿茎凋落物初始N含量与其分解速率成显著正相关，3种主要植物凋落物C含量和C/N与各器官凋落物分解速率成显著负相关。

关键词: 分解速率, 养分动态, 根茎叶, 季节变化

CLC Number:

S154.4

YU Wen-chao, ZHAO Jian-ning, LI Gang, XIU Wei-ming, ZHANG Gui-long, YANG Dian-lin. Litter Decompositions of Three Dominant Plants in the Stipa baicalensis Grassland of Inner Mongolia[J]. Acta Agrestia Sinica, 2014, 22(3): 502-510.

于雯超, 赵建宁, 李刚, 修伟明, 张贵龙, 杨殿林. 内蒙古贝加尔针茅草原3种主要植物凋落物分解特征[J]. 草地学报, 2014, 22(3): 502-510.

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Litter Decompositions of Three Dominant Plants in the Stipa baicalensis Grassland of Inner Mongolia

内蒙古贝加尔针茅草原3种主要植物凋落物分解特征

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