Influence of the decoupling degree on the estimation of canopy stomatal conductance for two broadleaf tree species
Influence of the decoupling degree on the estimation of canopy stomatal conductance for two broadleaf tree species
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解耦度对两种阔叶树冠层气孔导度估计的影响
DOI：
10.1016/j.agrformet.2016.02.018
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发表时间：
2016-05
影响因子：
6.2
通讯作者：
Huang YQ
中科院分区：
文献类型：
--
作者：
Zhu LW;Ni GY;Ouyang L;Huang YQ
冠层气孔导度（GS）估计是蒸散研究的一个重要方面。选择合适的放大模型对于研究植物水分调节是必要的。选择两个阔叶树种单一栽培种植园，即尾叶桉和木荷，通过广泛认可的由 Köstner 简化的方程（GS1）和逆 Penman-Monteith 方程（GS2）来研究 GS。估计解耦系数（Ω）以量化气孔与大气的解耦程度。我们发现这两个物种都与环境条件良好耦合（尾叶桉和木竹分别为 0.1 ± 0.06 和 0.22 ± 0.09）。 Ω随着冠层电导（GC）呈指数增加，并随着Ga的增加而降低，这意味着Ω存在气候和生理的综合调节。与 GS2（77.0±52.4 mmol m−2s−1 和尾叶和 S 分别为 112.0 ± 52.5 mmol m−2s−1）。 GS1/GS2 的比率随 Ω 线性下降，E 的斜率为 -1.92 和 -1.31。尾叶兰和S.分别是超级巴。 LAI的增加往往会增加解耦程度，从而进一步降低GS1估计的准确性。根据我们的结果，E 的所有数据中，85.3% 的 GS1/GS2 比率平均值为 0.94，37.6% 的平均值为 0.6。尾叶兰和S. superba 分别表示对 LAI 较低的林地的 GS1 进行更好的估计。根据 LAI 与 GS1/GS2 比值（ratio = 1.0759 × 0.02547（0.053LAI + 0.054）− 0.0078）之间的关系，我们可以揭示不同森林类型中简化方程推导的气孔导度的预测误差。
Canopy stomatal conductance (GS) estimation is a critical aspect of evapotranspiration research. Selecting an appropriate model for scaling-up is necessary to study plant water regulation. Two monoculture plantations of broadleaf tree species,Eucalyptus urophyllaandSchima superba,were selected to study GSvia a widely recognized equation simplified by Köstner (GS1) and an inverse Penman–Monteith equation (GS2). The decoupling coefficient (Ω) was estimated to quantify the decoupling extent of stomata from the atmosphere. We found that both species were well coupled with environmental conditions (0.1 ± 0.06 and 0.22 ± 0.09 forE. urophyllaandS. superba). Ω increased exponentially with canopy conductance (GC) and was depressed by the increase of Ga, which implied that there was a combined climatic and physiological regulation on Ω. GS1for both species (63.7 ± 33.9 mmol m−2s−1and 48.4 ± 18.1 mmol m−2s−1forE. urophyllaandS. superba,respectively) was underestimated with the simplified equation compared to GS2(77.0 ± 52.4 mmol m−2s−1and 112.0 ± 52.5 mmol m−2s−1forE. urophyllaandS. superba, respectively). The ratio of GS1/GS2linearly decreased with Ω by a slope of −1.92 and −1.31 forE. urophyllaandS. superba, respectively. The increase of the LAI tended to increase the decoupling extent, which further reduced the accuracy of the estimation of GS1. According to our results, the ratio of GS1/GS2had a mean of 0.94 for 85.3% and 0.6 for 37.6% of all of the data forE. urophyllaandS. superba, respectively, implying a better estimation of GS1for the stand that had a lower LAI. Based on the relationship between the LAI and the ratios of GS1/GS2(ratio = 1.0759 × 0.02547(0.053LAI + 0.054)− 0.0078), we can shed some light on the prediction error of stomatal conductance derived from the simplified equation in different forest types.
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影响因子：
4
作者：
Thomas Motzer;N. Munz;M. Küppers;Dieter Schmitt;D. Anhuf
通讯作者：
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影响因子：
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作者：
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通讯作者：
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影响因子：
4.2
作者：
Madeline Wu
通讯作者：
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影响因子：
6.2
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