The response of main photosynthesis and transpiration indexes of six walnut types (Juglans sp) to soil water stress was investigated with one-year-old seedlings. The physiological indexes were significantly affected by soil water stress but different sensitivity of each index was showed. As stress increasing, net photosynthesis rate, transpiration, stomata conduct and CO_2 concentration inside stomata were gradually decreased but water use efficiency and the temperature difference between leaf and atmospheres were promptly increased. Different types of walnut showed different photosynthesis and transpiration response to water stress. The response index of different type of walnut represented its resistant capability to water stress. The index analysis of six walnut types by comparison and statisistics of subject function showed that Xinjiang wild walnut (J. regia) and Pihshan No.1 (J. regia) had stranger drought resistance; Xinjiang Pihshan No.2 (J. regia) and Kui walnut (J. major) were in the middle level and Nan No.1 (J.nigra) and American black walnut (J. nigra) had a poor resistance.
Journal of Agricultural University of Hebei
net photosynthesis rate
soil water stress