Influence of water use efficiency parameterizations on flux variance similarity-based partitioning of evapotranspiration
Influence of water use efficiency parameterizations on flux variance similarity-based partitioning of evapotranspiration
复制标题
水分利用效率参数化对基于通量方差相似性的蒸散发划分的影响
DOI：
10.1016/j.agrformet.2022.109254
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发表时间：
2023
影响因子：
6.2
通讯作者：
Gunter, Stacey A.
中科院分区：
文献类型：
--
作者：
Wagle, Pradeep;Raghav, Pushpendra;Kumar, Mukesh;Gunter, Stacey A.
尽管在基于通量方差相似(FVS)的分配方法中，水分利用效率(WUE)估计对细胞内二氧化碳浓度(Ci)高度敏感，但对WUE对Ci参数的敏感性的系统分析一直很少。利用高频(10赫兹)涡动协方差资料对小麦(Triticum aestivumL.)和甘蓝型油菜(Brassica napusL.)的水汽压差，对4种参数(恒定ci值、恒定Ci/Caratio、Ci/Cas平方根和水汽压差的线性函数)进行了敏感性分析，并与不带可调参数的优化WUE方法进行了比较。结果表明，Ci参数对蒸散(ET)分配结果(即蒸腾量(T)与ET的比率)的影响。值得注意的是，对于所考虑的最大CI值(大多数先前研究中通常使用的缺省值)的常量CI值和常量Ci/Caratio参数，T：ET与优化的WUE方法相似。此外，这三种模型在雨季均产生降低的T：ET，在旱期产生升高的T：ET。相比之下，平方根模型和线性模型不能准确地捕捉T：ET在丰水期和枯水期的预期趋势，并且与最优WUE方法相比也显示出较大的差异。结果表明，在恒定CI值和恒定Ci/Caratio方法中可以得到最优的Ci参数，以准确地捕捉WUE和T：ET的时间变化。结果还表明，模型间比较，特别是在敏感性分析中，对于C3物种的FVS分配，该优化模型具有潜在的潜力。这项研究为参数选择对WUE估计和划分结果的影响提供了新的见解。
Despite the high sensitivity of water use efficiency (WUE) estimates to intracellular carbon dioxide concentrations (ci) in the Flux Variance Similarity (FVS)-based partitioning method, a systematic analysis of the sensitivity of WUE to ciparameterizations has largely been lacking. Using high-frequency (10 Hz) eddy covariance data for two crop sites: wheat (Triticum aestivumL.) and canola (Brassica napusL.), we performed a sensitivity analysis of four ciparameterizations (constant civalue, constant ci/caratio, and ci/caas square root and linear functions of vapor pressure deficit) and compared them with the optimized WUE approach with no adjustable parameter. The results illustrated the role of ciparameterizations on the evapotranspiration (ET) partitioning results (i.e., transpiration (T) to ET ratios). Notably, constant civalue and constant ci/caratio parameterizations for the largest considered civalues (commonly used default values in most previous studies) showed comparable T:ET with the optimized WUE approach. Additionally, all these three models produced reduced T:ET in wet periods and increased T:ET in dry periods. In contrast, square root and linear models were unable to accurately capture expected trends of T:ET for wet and dry periods, and also showed large discrepancies when compared with the optimal WUE approach. The results suggest that optimal parameterizations of cishould be derived in constant civalue and constant ci/caratio methods to accurately capture temporal variations of WUE and T:ET. The results also indicate the potential of the optimum model for inter-model comparison, especially in sensitivity analysis, for FVS partitioning in C3species. This study provides novel insights into the implications of the choice of parameterization on the WUE estimations and partitioning outcomes.
影响因子：
2.8
作者：
Anderson, Ray G.;Zhang, Xudong;Skaggs, Todd H.
通讯作者：
Skaggs, Todd H.
基于高频涡度协方差数据的 H2O 和 CO2 通量源划分方法的灵敏度分析：现场数据和大涡模拟的结果
影响因子：
6.2
作者：
A. Klosterhalfen;A. Moene;Marius Schmidt;Todd M. Scanlon;H. Vereecken;Alexander Graf
通讯作者：
Alexander Graf
影响因子：
4.9
作者：
P. Stoy;T. El-Madany;Joshua B. Fisher;P. Gentine;T. Gerken;Stephen P. Good;A. Klosterhalfen;
通讯作者：
P. Stoy;T. El-Madany;Joshua B. Fisher;P. Gentine;T. Gerken;Stephen P. Good;A. Klosterhalfen;