Chin J Plant Ecol ›› 2012, Vol. 36 ›› Issue (11): 1197-1204.DOI: 10.3724/SP.J.1258.2012.01197

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Root growth into litter layer and its impact on litter decomposition: a review

MA Cheng-En1, KONG De-Liang2,*(), CHEN Zheng-Xia3, GUO Jun-Fei4   

  1. 1Department of Ecology, Peking University, Beijing 100871, China
    2College of Life Sciences, Henan University, Kaifeng, Henan 475004, China
    3Shenzhen Graduate School, Peking University, Shenzhen 518055, China
    4Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China
  • Received:2012-07-27 Revised:2012-09-30 Online:2012-07-27 Published:2012-11-09
  • Contact: KONG De-Liang

Abstract:

Litter decomposition is one of the most important and dynamic components of nutrient cycling in ecosystems. In addition to the well-known actions of plant roots on litter, roots also constitute an important biotic factor regulating litter decomposition. However, relatively little attention has been given to this. Relative to the upper litter layer, the middle and lower layers are enriched in water and nutrients, which provide favorable conditions for root growth. By proliferating in litter, roots potentially influence litter decomposition through a priming effect, mycorrhizal fungi and N uptake. We give an overview of root foraging in litter, including factors influencing it. We then review its influence and possible mechanisms of root growth on litter decomposition. We also propose a conceptual module that enhances understanding of the relationship between root and litter decomposition.

Key words: decomposition, growth, litter layer, root system