干旱区生态环境知识资源中心(Arid): 内蒙古温带典型草原植物凋落物和根系的分解及养分动态的研究

Arid

	内蒙古温带典型草原植物凋落物和根系的分解及养分动态的研究
其他题名	Decomposition and nutrients dynamics of plant litter and roots in Inner Mongolia steppe
	刘忠宽 1; 汪诗平 1; 韩建国 2; 陈佐忠 1
来源期刊	草业学报
ISSN	1004-5759
出版年	2005
卷号	14 期号:1 页码:24-30
中文摘要	在中国科学院内蒙古草原生态系统定位研究站,利用不同放牧强度下连续放牧了10年(1990-1999)的放牧样地,对停牧后草地恢复过程中的羊草(Leymus chinensis)、糙隐子草(Cleistogenes squarrosa)和星毛委陵菜(Potentilla acaulis)的凋落物和根系的分解及养分释放特性进行了研究.结果表明,植物凋落物和根系的分解及养分释放速率均以建群种羊草最高,重度退化种星毛委陵菜最低;凋落物和根系的分解及养分释放速率与木质素含量、C∶N、木质素∶N和木质素∶P均呈显著的负相关关系,而与土壤温度和土壤湿度则呈显著的正相关关系;在凋落物和根系的分解及养分释放过程中,土壤温度与土壤湿度存在极显著的互作效应.
英文摘要	Plant litter decomposition is a fundamental process of ecosystem functioning because it is a major de-terminant of nutrient cycling. The rate of plant decomposition and nutrient release varies with a number of fac-tors, including the nature of the plant material. In general, low-nutrient species produce litter that is more dif-ficult to decompose than litter from high-nutrient species. In arid and semiarid grasslands late-seral dominant grasses tend to have high tissue N concentrations and low C : N ratios and lignin concentrations, which result in fast decomposition and nutrient mineralization. In this system, high-nutrient grasses are palatable to ungu-late grazers, whereas low-nutrient grasses are unpalatable to ungulate grazers. In order to prove these hypothe-sis, a field experiment was conducted in the typical steppe area of central Inner Mongolia to test the characteris-tics of decomposition and nutrient release from leaf litter and roots from Leymus chinensis (high-nutrient, pal-atable grass), Cleisto genes squarrosa (middle-nutrient, palatable grass) and Potentilla acaulis (low-nutrient, unpalatable grass). Leaf litter and roots of each species were incubated in 3 mm mesh bags for 12 months at their source sites. Leaf litter decomposition was faster (P<0. 01) in the palatable than in the unpalatable spe-cies and, on average, root decomposition was faster (P<0. 01) in Leymus chinensis than in Cleistogenes squar-rosa and Potentilla acaulis. At the end of the incubation period nitrogen (N) and phosphorus (P) release from the leaf litter and roots was higher (P<0. 01) in the palatable than in the unpalatable species. The results on leaf litter and roots support the hypothesis that decomposition and nutrient release are faster in the palatable than in the unpalatable grasses. Moreover, decomposition of and nutrients release from plant litter and roots have significantly positive correlations with soil temperature and moisture, and significantly negative correla-tions with lignin content, C ! N ratio, Lignin : N ratio and Lignin: P ratio.
中文关键词	凋落物 ; 根系 ; 分解 ; 养分动态
英文关键词	plant litter plant root decomposition nutrient dynamics
语种	中文
国家	中国
收录类别	CSCD
WOS类目	PLANT SCIENCES
WOS研究方向	Plant Sciences
CSCD记录号	CSCD:1875203
来源机构	中国科学院植物研究所 ; 中国农业大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/205960
作者单位	1.中国科学院植物研究所, 植被数量生态学重点实验室, 北京 100093, 中国; 2.中国农业大学草地研究所, 北京 100094, 中国
推荐引用方式 GB/T 7714	刘忠宽,汪诗平,韩建国,等. 内蒙古温带典型草原植物凋落物和根系的分解及养分动态的研究[J]. 中国科学院植物研究所, 中国农业大学,2005,14(1):24-30.
APA	刘忠宽,汪诗平,韩建国,&陈佐忠.(2005).内蒙古温带典型草原植物凋落物和根系的分解及养分动态的研究.草业学报,14(1),24-30.
MLA	刘忠宽,et al."内蒙古温带典型草原植物凋落物和根系的分解及养分动态的研究".草业学报 14.1(2005):24-30.