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定量遥感反演作物水势的原理及其应用

张杰1;张强1;赵宏1;张平兰2   

  1. 1中国气象局兰州干旱气象研究所, 甘肃省干旱气候变化与减灾重点实验室, 中国气象局干旱气候变化与减灾重点开放实验室, 兰州 730020;2甘肃省气象局气候中心, 兰州 730020
  • 收稿日期:2007-08-31 修回日期:1900-01-01 出版日期:2008-06-10 发布日期:2008-06-10

Theory and application of leaf water potential retrieved from remote sensing.

ZANG Jie1;ZHANG Qiang1;ZHAO Hong1;ZHANG Ping-lan2   

  1. 1Key Laboratory of Arid Climatic Changing and Reducing Disaster of Gans
    u Province, Key Open Laboratory of Arid Climatic Changing and Disaster Reduction of China Meteorological Administration, Institute of Arid Meteorology, China Meteorological Administration, Lanzhou 730020, China;2Climate Center of Gansu Meteorological Administration, Lanzhou 730020, China
  • Received:2007-08-31 Revised:1900-01-01 Online:2008-06-10 Published:2008-06-10

摘要: 在利用能量平衡原理估算蒸腾速率的基础上,结合大气水势和叶、气阻抗的估算,建立叶水势的遥感估算模型。应用CI-301光合作用仪观测的作物生理参数和气象参数,验证了叶水势的遥感反演精度,分析了叶水势对干旱半干旱区气候干旱和作物生理干旱的响应敏感程度。结果表明:叶水势是反映作物干旱情况的较好指标,它不仅能够反映作物生理干旱特征,也能够反映气候干旱特征;叶水势反演结果的相对误差为3.2%~17.3%,说明遥感估算的叶水势可以用于干旱监测中,以评估作物水分胁迫。在甘肃省的干旱年份2005年, 5月的叶水势为-2~-3 MPa,6月的叶水势为-2 MPa左右,其反映的干旱程度与植物种类有关。

关键词: 浮游植物, 核酮糖1,5-二磷酸羧化/氧化酶大亚基基因, 分子遗传多样性

Abstract: Based on the estimation of transpiration rate by energy balance theory, and combining the estimations of atmospheric water potential and leaf and atmosphere resistance, a leaf water potential model retrieved from remote sensing was built. Some physiological and meteorological parameters observed by CI-301 apparatus were used for testing the retrieval precision of leaf water potential; and the sensitivity of the responses of leaf water potential to physiological and climate drought in arid and semiarid region was analyzed. The results showed that leaf water potential was a good index for reflecting drought, by which, thecharacteristics of physiological and climate drought could be well expressed. The retrieval error of leaf water potential from remote sensing was between 3.2% and 17.3%, indicating that the leaf water potential estimated by remote sensing could be used for monitoring drought and evaluating water stress. In the dry year of 2005 in Gansu, the leaf water potential was between -2 and -3 MPa in May and about -2 MPa in June, and the drought degree was correlated to crop species.

Key words: Phytoplankton, Ribulose-1, 5-bisphosphate carboxynase/oxygenase large subunit gene(rbcL), Molecular genetic diversity