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磷素是干旱半干旱地区沙地生态系统的限制性养分因子,沙地土壤磷循环对沙地生态系统生产力维持至关重要,越来越受到人们的关注。本文根据国内外研究成果,对沙地土壤磷的来源、磷库容量、磷循环途径和影响磷循环的因素等关键问题进行综述,认为磷循环研究方向可归纳为以下几个方面:1)影响沙地土壤磷循环各因素的作用机制;2)不同磷循环途径的磷收支通量;3)不同土壤利用状态下,磷平衡状况;4)不同土壤利用状态下,土壤生产力的可持续性;5)维持土壤磷平衡采用的生态恢复手段。上述研究,对于维持沙地生态系统稳定的生产力,解决人与资源和环境的矛盾均有指导作用。
Phosphorus is a limiting nutrient element of sand ecosystem in arid and semi-arid areas. Phosphorus cycling in sandy soils is crucial for the maintenance of ecosystem productivity in sandy areas, and attracts more and more attention. According to the research results at home and abroad, the key issues of phosphorus source, phosphorus storage capacity, phosphorus cycling pathways and factors affecting phosphorus cycling in sandy soil are reviewed. The research directions of phosphorus cycling can be summarized as follows: 1) Mechanism of various factors on phosphorus cycling in sandy soils; 2) Phosphorus balance in different P cycling ways; 3) Phosphorus balance under different soil use; 4) Sustainability of soil productivity under different soil conditions ; 5) Ecological restoration methods used to maintain soil phosphorus balance. The above research has a guiding role in maintaining the stable productivity of sandy ecosystems and in resolving the contradictions between human resources and the environment.