Systematic Restoration for Degraded Grasslands: Concept, Mechanisms and Approaches
WANG DeLi1, WANG Ling1, XIN XiaoPing2, LI LingHao3, TANG HuaJun,21Key Laboratory of Vegetation Ecology, Ministry of Education/School of Environment, Northeast Normal University, Changchun 130024 2Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081 3State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing 100093
Abstract Grasslands occupying the most terrestrial land surface display multiple functions. The long-term overgrazing of livestock often occur, and additional climate changes brings about the negative effects on the ecological stability, and therefore, grassland degradation is worldwide prevailing, which reduce the multiple functions of grasslands, and how to restore those degraded grasslands remains a crucial challenge for the human beings. For the past several decades, most researches on grassland restoration have focused on restoration practice rather than underlying theoretical basis, and the general restoration theory is lacking. Consequently, it is hard to have a practical solution for degraded grasslands due to lack of the available techniques. In this paper, the authors summarize the previous grassland restoration theories or models from restoration succession trajectory to the threshold model, the alternative state model and the filter model. A new concept, named as “systematic restoration for degraded grasslands” is put forward, which emphasizes three dimensions as key structure components (trophic species and dominant species of plant-animal-microbe), self-organized processes (water-nutrient coupling, linkage between aboveground and belowground), and multi-functionality (synergy and stability of grassland multiple functions), and also give the further explanations for contexts and mechanisms of the grassland systematic restoration (GSR): system structure integration, self-organization of ecological processes, and multi-functionality. Generally, the target of grassland restoration is approaching to the climax community or primordial state of ecosystem. The authors here emphasize the restoration of system self-organization, resulting from the interactions among the species like plant-soil feedback, as well as grassland multiple functions (goods and ecological services)characterized by their synergism and coupling. At last, the authors discuss the potential restoration practices like natural restoration by fencing and resting, intervening restoration with artificial inputs, and stimulating restoration with utilizing such as grazing and cutting, and perhaps the latter is the feasible mean for practical grassland restoration. The restoration mechanisms and practices for degraded grasslands are more complicated than thought, and here we attempt to establish a comprehensive conceptual framework to provide a new insight into grassland restoration theory. Certainly, it needs more evidence and experiments to enrich this new concept, GSR. Keywords:grasslands;degradation;restoration;systematic restoration;trophic;ecological process
PDF (2259KB)元数据多维度评价相关文章导出EndNote|Ris|Bibtex收藏本文 本文引用格式 王德利, 王岭, 辛晓平, 李凌浩, 唐华俊. 退化草地的系统性恢复:概念、机制与途径[J]. 中国农业科学, 2020, 53(13): 2532-2540 doi:10.3864/j.issn.0578-1752.2020.13.002 WANG DeLi, WANG Ling, XIN XiaoPing, LI LingHao, TANG HuaJun. Systematic Restoration for Degraded Grasslands: Concept, Mechanisms and Approaches[J]. Scientia Acricultura Sinica, 2020, 53(13): 2532-2540 doi:10.3864/j.issn.0578-1752.2020.13.002
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