Abstract:989-1001 英文引用格式: Du Q, Liu H Z, Feng J W, et al. 2014. Effects of different gap filling methods and land surface energy balance closure on annual net ecosystem exchange in a semiarid area 摘要 基于半干旱区 2 种不同下垫面(草地和旱作农田)2005 和 2008 年涡动相关法取得 的通量资料, 分析了数据填补、能量收支闭合率以及摩擦风速(u*)阈值等对生态系统年净 碳交换的影响. 通过加入 4 种不同长度的人工空缺(空缺长度从 0.5 h~12 d), 比较了平均日 变化法(MDV)、边缘分布抽样法(MDS)和非线性回归法等 6 种填补方法的填补效果. 结果 表明, MDS 的整体表现最好, 特别是对长空缺的填补效果优于其他方法, 估算的年 NEE 偏 差在 5 g C m 2 a 1 以内. 非线性回归法估算的夜间 NEE 具有较大的正偏差, 表明非线性回 归法估算的夜间生态系统呼吸偏高. 4 种非线性回归法估算的年 NE… Show more
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