JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2020, Vol. 44 ›› Issue (2): 1-9.doi: 10.3969/j.issn.1000-2006.202001013

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Key ecological issues in plant-soil feedback: pattern, process and mechanism

WANG Shaojun1,2()   

  1. 1. College of Ecology and Environment, Southwest Forestry University, Kunming 650224, China
    2. Co-Innovation Center for the Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing 210037, China
  • Received:2020-01-05 Revised:2020-02-03 Online:2020-03-30 Published:2020-04-01

Abstract:

The process and mechanism of mutual feedback between plant and soil can determine the structure, function and process of ecosystems. They are also key scientific issues to understand the responses of terrestrial ecosystems to global changes. This review focused on cascading effects and their variations in patterns of nutrient-feedback between plant and soil at different spatial scales (i.e., root surface, rhizosphere, species, ecosystem and region) and various temporal dimensions (from seconds to thousand years). The plant-soil feedback was expounded at the level of root-soil interface, plant species, ecosystem and regional geography. We highlighted the regulatory mechanism of rhizosphere-interface process of root secretion, symbiosis, growth and metabolism on soil water and nutrients absorption, and physical modification. Moreover, we expounded the mechanism of above- and under-ground nutrient cycling process driven by interactions among plant species, litter chemistry, soil organism and soil organic matter. The bottom-up and top-down control theories, and the detritus food-web model were applied to reveal the process and mechanism of interactions between above-and under-ground biotic communities. We explored the process and mechanism of mutual feedback between soil geography evolution (the change in pattern of rock weathering, soil formation and soil nutrients), and regional vegetation succession (i.e., dominant species replacement, and shifting in mode of vegetation distribution, and above-ground litter input). This review also focused on the characteristics, formation mechanism and possible regulatory strategies of plant-soil mutual feedback for global change issues (i.e., ecological degradation and restoration, ecological invasion of alien species, atmospheric N deposition, elevated CO2 concentration, and reduced biodiversity). Furthermore, we concluded the biological and ecological processes of the interactions between above- and under-ground terrestrial ecosystems, predicting the response characteristics and mechanism of terrestrial ecosystems.

Key words: plant-soil, rhizosphere interface, ecosystem, feedback effect, feedback pattern, feedback process, feedback mechanism

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