涝害对桢楠幼树生长及光合生理特性的影响

Effect of Flood on Growth Characteristics and Photosynthetic Physiology of Phoebe zhennan Saplings

为探讨土壤水分含量过度对桢楠幼树生长特性和光合生理的影响,以来源于同一母树种子育苗,同年生且长势基本一致的桢楠幼树为材料,栽种于四川农业大学教学科研园区内(四川盆地西缘的华西雨屏区),观察测定栽植3年后、排水良好和排水不良地块对桢楠幼树生长及光合生理的响应,分别于2014年4月、6月、8月和10月测定形态指标;6月、8月和10月测定光合生理指标。结果显示株高和地径实际生长指标表现为:排水好的桢楠>中度水涝的桢楠>重度水涝的桢楠。几次测得的光合指标也显示出排水好的桢楠幼树的光合效率高于其他两组。综上表明,桢楠幼树在水分相对良好的地段其生长发育好于水涝相对严重的地段,这对于桢楠造林时正确选择立地和进行科学的水分管理具有重要的意义。

To investigate effects of soil moisture content on the growth and photosynthetic physiological characteristics,Phoebe zhennan saplings of same age and same mother tree were cultivated respectively in different moisture content soil in the Teaching and Research Base of Sichuan Agricultural University(the western margin in the Rainy Zone of West China of the Sichuan Basin).The observation and measurement of soil moisture content were performed respectively in April,June,August and October,and the determinations of morphological indexes were conducted in June,August and October respectively.The results showed that the plant height and ground diameter were higher in the soil of good drainage than those in the moderate or severe waterlogging soil.The photosynthetic efficiency of saplings were also higher in well drained soil.It was of important significance to select proper planting site for P.zhennan.