水分胁迫对成年荔枝不同季节光合速率日变化的影响  

Effects of Water Stress on Diurnal Changes in the Net Photosynthetic Rate of Adult Litchi in Different Seasons

作　　者：宋世文 王泽槐[2] 赵晓勤[2] 谢世恭 曾亚妮 李建国[2] 谢永红 

机构地区：[1]广东深圳宝安区农业科学技术推广中心,广东深圳518101 [2]华南农业大学中国荔枝研究中心,广州510642 [3]深圳市南山区西丽果场,广东深圳518055

出　　处：《热带亚热带植物学报》2007年第6期482-486,共5页Journal of Tropical and Subtropical Botany

基　　金：深圳市农业综合开发基金项目资助

摘　　要：以16a生‘糯米糍’荔枝(Litchi chinensis Sonn.cv.Nuomizi)为试材,研究了其在水分胁迫下不同季节的光合速率日变化。结果表明,保湿处理的净光合速率(Pn)日变化在秋、夏季呈单峰曲线,冬、春季为双峰曲线;干旱处理除在冬季出现双峰曲线外,其他季节均呈单峰曲线。两个处理的Pn日变化最大值或第1个峰值出现时间基本一致,冬季为9:00、春季和夏季为10:00、秋季为12:00。保湿处理的日最高Pn变化范围为6.25-8.14μmolm-2s-1,干旱处理的在4.35-6.56μmolm-2s-1;中度水分胁迫对田间成年荔枝树的光合速率具有较大的抑制作用,干旱对日净光合总量的抑制比例分别为:冬季18.6%,夏季21.3%,春季34.1%,秋季34.7%。在光合作用旺盛时段(8:00-16:00)中度水分胁迫导致叶片Pn的降低主要是由气孔因素所致。Effects of water stress on the diurnal changes of the net photosynthetic rate （Pn） in different seasons were investigated in 16-year-old trees ofLitchi chinensis Sonn. cv. Nuomizi. In wet treatment the diurnal curves of Pn exhibited double peaks in autumn and summer, and a single peak in winter and spring, whereas in drought treatment they exhibited two peaks in winter and single peak in the other seasons. The maximum Pn or the first peak during daytime was generally the same in both treatments, which occurred at 9：00 in winter, 10：00 in spring and summer, 12：00 in autumn. The maximum Pn in wet- and drought-treated trees ranged from 6.25 μmolm^-2s^-1 to 8.14μmolm^-2s^-1 and from 4.35 μmolm^-2s^-1to 6.56 μmolm^-2s^-1, respectively. Moderate water stress could largely inhibit the photosynthesis oflitchi tree, and the amount of daily Pn was decreased by 18.6%, 21.3%, 34.1% and 34.7% in winter, summer, spring and autumn, respectively. It was suggested that moderate water stress leads to Pn decrease by affecting stomatal conductance （Gs）.

关 键 词：荔枝 水分胁迫 光合速率 

分 类 号：S667.1[农业科学—果树学]