摘要
荒漠植被蒸腾过程是研究干旱区生态水文过程的关键一环。当前对植物蒸腾过程模拟的发展方向是光合-气孔导度-蒸腾过程耦合模型,将植物叶片的水碳交换过程通过气孔导度模型耦合起来,从而反映植物生理生态对植物蒸腾的影响特征,也揭示水分胁迫是如何影响植物生长过程的。中国干旱区水分环境是特殊的,温带荒漠植物的生理生态对干旱环境下水分条件的响应过程也是独特的,这决定了荒漠植物蒸腾过程特征的独特性,也使得当前先进的水碳耦合蒸腾模拟方法针对中国荒漠植物需要进行有针对性的修改。这些修改的关键包括对干旱区荒漠植物SPAC水分运动过程、植物水分胁迫的生理生态响应规律和荒漠植物气孔导度变化规律等的理解和模拟。相关的国内研究近些年已经有了一些开展,部分领域也得出了许多有意义和可以借鉴的结论。但是围绕蒸腾模型建立所必需的一些水碳交换过程规律的深入认识和模拟等方面,目前的研究没有比较好的支撑,还需要进一步深入研究。
Transpiration process of desert plants is a key issue on ecohydrological process research in arid regions.At present,simulation of plant transpiration process is generally based on photosynthesis-stomatal conductance-transpiration coupled models,which simulate the water and carbon exchange between plant and air,and explain the mechanisms of interaction between plant physiological activities and water environment.For special water environment in arid regions of China,the desert plants have unique ecophysiological responses to the arid environment,which makes the desert plants transpiration processes in arid region of China unique.It is necessary to make revision on some processes and threshold values in transpiration process models when using the present popular transpiration models to the desert plants modeling in Chinese arid regions.The key to make the revisions is to understand and simulate three processes,including the water movement in SPAC,the ecophysiological responses to water stress,and the leaf stomatal conductance activities of desert plants in China.This paper reviews some advances in related researches,and discusses some questions about the above-mentioned three processes.
出处
《中国沙漠》
CSCD
北大核心
2012年第1期47-53,共7页
Journal of Desert Research
基金
国家重点基础研究发展规划项目(2009CB421305)资助
关键词
蒸腾
模拟
荒漠
荒漠植物
transpiration
modeling
desert
desert plant
