极端干旱条件下胡杨叶片气孔导度模拟

干旱区地理 ›› 2016, Vol. 39 ›› Issue (3): 607-612.

极端干旱条件下胡杨叶片气孔导度模拟

高冠龙^1,2, 张小由¹, 鱼腾飞¹, 常建峰³, 赵虹⁴

1 中国科学院寒区旱区环境与工程研究所, 甘肃兰州 730000;
2 中国科学院大学, 北京 100049;
3 张掖市国土资源局, 甘肃张掖 734000;
4 浙江瑞启检测技术有限公司, 杭州 310000

收稿日期:2015-11-24 修回日期:2016-02-25 出版日期:2016-05-25
通讯作者: 张小由,Email:zhangxy@lzb.ac.cn
作者简介:高冠龙(1988-),男,在读博士,主要从事干旱区生态水文研究.Email:guanlong_gao@163.com
基金资助:
国家自然科学基金项目(41271037);国家自然科学基金青年科学基金项目(41401033)

Simulation of leaf stomatal conductance of Populus euphratica Oliv. under extremely dry conditions

GAO Guan-long^1,2, ZHANG Xiao-you¹, YU Teng-fei¹, CHANG Jian-feng³, ZHAO Hong⁴

1 Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, Gansu, China;
2 Chinese Academy of Sciences, Beijing 100049, China;
3 Zhangye Land and Resources Bureau, Zhangye 734000, Gansu, China;
4 ZheJiang RuiQi Testing TECH CO., LTD, HangZhou 310000, Zhejiang, China

Received:2015-11-24 Revised:2016-02-25 Online:2016-05-25

摘要/Abstract

摘要： 植物叶片气孔是控制水分和CO₂出入通道,是植物水分蒸腾和气体交换门户。在对气孔的环境响应机理认识不足时,模拟成为最有效和适宜的工具而受到广泛关注。基于Li-COR 6400便携式光合作用测定系统,采集了2014年6~9月额济纳绿洲荒漠河岸胡杨林生长季内实测叶片气孔导度数据,运用学术界广泛用于估算气孔导度对环境因子响应的两个模型:Jarvis模型和BWB模型,分别对胡杨叶片的气孔导度进行了模拟,并将模拟结果与实测数据进行比较。研究结果发现:由Jarvis模型模拟的气孔导度值其均方根误差、相对误差和平均绝对误差(0.047、0.011、0.002)均小于BWB模型各值(0.075、0.447、0.061),而决定系数Jarvis模型(0.665)大于BWB模型(0.365)。说明对于极端干旱条件下的中幼龄胡杨林,Jarvis模型的模拟精度较高,由其模拟的叶片气孔导度值更接近基于Li-COR 6400便携式光合作用系统测定的真实值。分析其原因在于:在干旱半干旱气候条件下,土壤含水量和气温决定了植物气孔的开闭,进而限制了CO₂的同化速率,这与BWB模型的构建前提不一致。

关键词: 额济纳绿洲, 极端干旱, 胡杨, 气孔导度

Abstract: Stomata are accesses of moisture and CO₂, and gateways for moisture evaporating and gas exchanging. Modeling has been the most effective and appropriate method for discussing the relationship between stomata and the environmental factors, when lacking the understanding of the stomata mechanism to environmental responses. Based on a Li-6400 portable apparatus, this article used two commonly used stomatal conductance models, Jarvis and BWB, to simulate the leaf stomatal conductance of Populus euphratica Oliv. on the basis of the measured data from June to September during the growing season in 2014. Results show that:the determination coefficient of the Jarvis model was 0.665, with RMSE, RE and MAE being 0.047, 0.011 and 0.002, respectively. The determination coefficient of the BWB model was 0.365, with RMSE, RE and MAE being 0.075, 0.447 and 0.061, respectively. This indicated that for the young and middle aged Populus euphratica Oliv. forest in arid and semi-arid regions, the simulation accuracy of the Jarvis model was better than that of the BWB model, and the simulated values based on the Jarvis model were closer to those observed by the Li-6400 portable apparatus. Possible reason was that the soil moisture content and temperature together determined the open or close of the stomata which would then confine the assimilation rate of CO₂, this was inconsistent with the premise of the BWB model.

Key words: Ejin oasis, extreme dry condition, Populus euphratica, stomatal conductance

中图分类号:

Q945.17⁺2

高冠龙, 张小由, 鱼腾飞, 常建峰, 赵虹. 极端干旱条件下胡杨叶片气孔导度模拟[J]. 干旱区地理, 2016, 39(3): 607-612.

GAO Guan-long, ZHANG Xiao-you, YU Teng-fei, CHANG Jian-feng, ZHAO Hong. Simulation of leaf stomatal conductance of Populus euphratica Oliv. under extremely dry conditions[J]. , 2016, 39(3): 607-612.

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