Simulating canopy conductance of the Haloxylon ammodendron shrubland in an arid inland river basin of northwest China
Simulating canopy conductance of the Haloxylon ammodendron shrubland in an arid inland river basin of northwest China
复制标题
西北干旱内陆河流域梭梭灌丛冠层导度模拟
DOI：
10.1016/j.agrformet.2017.11.015
复制
发表时间：
2018-02
影响因子：
6.2
通讯作者：
Sudicky Edward A.
中科院分区：
文献类型：
--
作者：
Xu Shiqin;Yu Zhongbo;Zhang Ke;Ji Xibin;Yang Chuanguo;Sudicky Edward A.
准确估计冠层导度（gc）对于量化生态系统的碳、水和能量通量以及了解干旱地区植被的水利用模式至关重要。为此，通过测量两个主要生长季节（2014-2015）的液流和并发小气候，使用彭曼-蒙特斯反方程计算了以三种沙漠灌木物种为主的梭梭群落的gco。然后，它被用来检查包含不同响应函数的 Jarvis-Stewart (JS) 模型和基于简化过程的模型 (BTA)，以选择最适合我们研究物种和气候的模型。光合有效辐射和蒸气压不足通常在一天中共变，并且已知具有相反的影响。当考虑到这种影响时，JS 模型和 BTA 模型都产生了更好的gcfittings。选择适当的蒸气压亏空函数和气温函数显着提高了 JS 模型的性能。与 PM 计算的 gc 相比，最佳 JS 模型的相关系数为 0.89，RMSE 为 1.99 mm s−1，平均百分比误差为 19%，而最佳 BTA 模型优于该模型，表现为较高的相关系数 (0.90)、较低的 RMSE (1.93 mm s−1) 和平均百分比误差 (9%)。平均解耦系数为0.28，表明冠层为H。梭梭群落与大气耦合良好。这些发现阐述了选择胁迫函数和考虑气温对于改善干旱地区估计的重要性，并获得了冠层电导环境控制的新知识。
Accurate estimates of canopy conductance (gc) are essential for quantifying the carbon, water and energy fluxes of ecosystem and understanding the patterns of water utilization of vegetation in arid regions. To this end,gcofHaloxylon ammodendroncommunity, dominated by three desert shrub species, was calculated using the inversed Penman-Monteith equation from measurements of sap flow and concurrent microclimate over two main growing seasons (2014–2015). Then, it was used to examine the Jarvis-Stewart (JS) models which comprised different response functions and the simplified process-based model (BTA) to select the best one for our study species and climate. Photosynthetically active radiation and vapor pressure deficit typically covary throughout the day and are known have opposite effects ongc. When this effects was taken into account, both the JS model and the BTA model produced bettergcfittings. Selection of proper vapor pressure deficit function and air temperature function significantly improved the performance of the JS model. The best JS model given a correlation coefficient of 0.89,RMSEof 1.99 mm s−1and average percent error of 19% in comparison with the PM-calculatedgc, while the best BTA model outperformed this model, reflected by higher correlation coefficient (0.90), and lowerRMSE(1.93 mm s−1) and average percent error (9%). The average decoupling coefficient was 0.28, indicating canopies ofH. ammodendroncommunity were well coupled from the atmosphere. These findings addressed the importance of selection of stress function and consideration of air temperature for improvinggcestimation in arid region, and gain new knowledge on the environmental control on canopy conductance.
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比较估计沙漠灌木蒸腾作用的三种模型
影响因子：
6.4
作者：
Xu Shiqin;Yu Zhongbo;Ji Xibin;Sudicky Edward A.
通讯作者：
Sudicky Edward A.
影响因子：
13.5
作者：
Cleugh, Helen A.;Leuning, Ray;Running, Steven W.
通讯作者：
Running, Steven W.
影响因子：
4
作者：
Thomas Motzer;N. Munz;M. Küppers;Dieter Schmitt;D. Anhuf
通讯作者：
Thomas Motzer;N. Munz;M. Küppers;Dieter Schmitt;D. Anhuf
影响因子：
4.7
作者：
J. Vrugt;W. Bouten;S. Dekker;P. Musters
通讯作者：
J. Vrugt;W. Bouten;S. Dekker;P. Musters
DOI：
10.1002/2013jg002472
发表时间：
2014-01
期刊：
Journal of Geophysical Research: Biogeosciences
影响因子：
--
作者：
T. Rodrigues;G. Vourlitis;F. Lobo;R. G. Oliveira;J. Nogueira
通讯作者：
T. Rodrigues;G. Vourlitis;F. Lobo;R. G. Oliveira;J. Nogueira