Arid
DOI10.1016/j.apsoil.2008.08.002
Effects of grazing and rainfall variability on root and shoot decomposition in a semi-arid grassland
Giese, Marcus1,2; Gao, Ying Zhi2,5; Zhao, Ying2; Pan, Qingmin4; Lin, Shan3; Peth, Stephan2; Brueck, Holger1
通讯作者Brueck, Holger
来源期刊APPLIED SOIL ECOLOGY
ISSN0929-1393
EISSN1873-0272
出版年2009
卷号41期号:1页码:8-18
英文摘要

Overgrazing increasingly affects large areas of Inner Mongolian semi-arid grasslands. Consequences for ecosystem functions and, in particular, for the decomposition as a key process of ecosystem carbon (C) and nitrogen (N) cycling are still unclear.


We studied the effects of grazing on shoot and root decomposition with the litter bag method in a long-term grazing exclosure (UG79), a moderate winter grazed (WG) and a long-term heavily grazed site (HG). We separated the effects of local environmental factors and litter quality as altered by grazing. Growing seasons of average and very low precipitation allowed us to study the effect of inter annual rainfall variability on decomposition.


Grazing-induced differences in environmental factors of the three studied grassland sites had no effect on decay rates of shoot and root dry mass. Also differences in litter quality among the grazing sites were not reflected by root decomposition dynamics. The accelerated shoot decay at site HG could not clearly be linked to litter quality parameters. Shoot decay rates were more or less constant, even under very dry conditions. This indicates the possibility of photodegradation (solar UV-B radiation) to control aboveground decomposition in this semi-arid ecosystem. By selecting the best predictors of root decomposition from regression analysis, we found that soil water content was the best parameter explaining the dynamics.


Net N immobilization was generally not detected during the decay process of shoot and root. It is likely, when root decomposition is strongly reduced in dry periods, shoot decomposition becomes relatively more important for nutrient cycling. A separate analysis of shoot and root decay dynamics is required in order to describe C and N cycling in this semi-arid grassland. The grazing impact on C and N fluxes through decomposition of plant material likely exhibits a strong interaction with seasonal rainfall pattern. (C) 2008 Elsevier B.V. All rights reserved.


英文关键词Steppe Nitrogen and carbon cycling N release Litter bag Inner Mongolia
类型Article
语种英语
国家Germany ; Peoples R China
收录类别SCI-E
WOS记录号WOS:000262872800002
WOS关键词LONG-TERM DECOMPOSITION ; LITTER DECOMPOSITION ; INNER-MONGOLIA ; LEAF-LITTER ; SHORTGRASS STEPPE ; NITROGEN DYNAMICS ; PLANT ; CLIMATE ; QUALITY ; ECOSYSTEMS
WOS类目Soil Science
WOS研究方向Agriculture
来源机构中国农业大学 ; 中国科学院植物研究所
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/159768
作者单位1.Univ Hohenheim, Inst Plant Prod & Agroecol Trop & Subtrop, D-70599 Stuttgart, Germany;
2.Univ Kiel, Inst Plant Nutr & Soil Sci, D-24118 Kiel, Germany;
3.China Agr Univ, Dept Plant Nutr, Beijing 100094, Peoples R China;
4.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing 100093, Peoples R China;
5.NE Normal Univ, Key Lab Vegetat Ecol, Changchun 130024, Peoples R China
推荐引用方式
GB/T 7714
Giese, Marcus,Gao, Ying Zhi,Zhao, Ying,et al. Effects of grazing and rainfall variability on root and shoot decomposition in a semi-arid grassland[J]. 中国农业大学, 中国科学院植物研究所,2009,41(1):8-18.
APA Giese, Marcus.,Gao, Ying Zhi.,Zhao, Ying.,Pan, Qingmin.,Lin, Shan.,...&Brueck, Holger.(2009).Effects of grazing and rainfall variability on root and shoot decomposition in a semi-arid grassland.APPLIED SOIL ECOLOGY,41(1),8-18.
MLA Giese, Marcus,et al."Effects of grazing and rainfall variability on root and shoot decomposition in a semi-arid grassland".APPLIED SOIL ECOLOGY 41.1(2009):8-18.
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