【摘要】 介绍野外估测森林土壤N有效性的常用方法,包括埋袋法、PVC顶盖埋管法、离子交换树脂袋法、树脂芯法、15N同位素法和生态系统N收支估算法。同时指出,传统的以土壤N矿化为N循环核心的理论受到挑战,新的理论体系中,把解聚合、植物-微生物竞争、微环境的作用作为N有效性估测的关键,为此,以上研究方法均存在局限性,N有效性的研究方法还有待进一步改进。更多还原

【Abstract】 Evaluation methods for soil N availability are important to assess forest N cycling and its related issues.This paper reviewed the soil N availability in situ evaluation methods,which included buried-bag incubation,PVC closed-top tube incubations,ion exchange resin bags,resin cores,15 N methods and ecosystem N budgets.As a result of the challenges to the classical soil N cycling paradigm,N mineralization being the perceived center point of the soil N cycle,ecologists provided the new paradigm,depolymerization,plant-microbe competition and microsite processes being the three key problems to assess soil N availability.Thus,all methods above were limited,and new method needed to be provided and developed as an urgent task in the future.更多还原