杏-紫花苜蓿复合系统中紫花苜蓿的光合和蒸腾特性研究  

Study on photosynthetic and traspiration chanacteristics of Medicago sativa in Prunus armeniaca-Medicago sativa agroforestry system

作　　者：高峻[1] 桑玉强[2] 孟平[1] 张劲松[1] 贾长荣 任迎丰 

机构地区：[1]中国林业科学研究院林业研究所,国家林业局小浪底森林生态系统定位研究站,北京100091 [2]河南农业大学林学院,河南郑州450002 [3]河南省济源市国有大沟河林场,河南济源454650

出　　处：《河南农业大学学报》2009年第5期501-505,共5页Journal of Henan Agricultural University

基　　金：国家“十一五”科技支撑课题资助项目(2006BAD03A0501);公益性科研院所基本科研业务费专项资金(200706)

摘　　要：以杏—紫花苜蓿复合系统中紫花苜蓿为研究对象,利用L i-COR 6400便携式光合作用仪测定其光合和蒸腾速率,结果表明:(1)杏—紫花苜蓿复合系统中,杏树行中间测点的光照度日变化规律与对照一致,都是单峰曲线,但是峰值低于对照.树行的东西冠下测点的日变化规律是对称的,前者上午出现峰值,后者下午出现峰值.树行中间、东林冠下和西林冠下日平均光照度比对照分别减小28.0%,61.9%和67.2%;(2)随着遮荫强度的增加,紫花苜蓿的光合速率降低,光饱和点、光补偿点和最大净光合速率等光合参数值相应减小;(3)杏—紫花苜蓿复合系统中紫花苜蓿的光合速率和蒸腾速率均降低,日变化曲线也发生变化.The photosynthetic and transpiration characteristics of Medicago sativa in Prunus armeniaca and Medicago sativa tree-grass system were studied using the Li-COR 6400 portable photosynthetic system.The results were as follows：（1）The diurnal variation of light intensity at the middle experimental site between the apricot rows demonstrated a curve with one peak,the same as the control,but the value of light intensity on the peak was lower than that of the control.The diurnal changes of light at the east and west sites were symmetrical. The peak of the former appeared in the morning, and that of the latter in the afternoon. The average diurnal light intensities at the middle site, east rows and west rows were 28.0% ,61.9% ,67.2% lower than that of the control, respectively; （2） Different light environments were simulated with shading treatments. The photosynthetic rate of Medicago sativa decreased steadily, and the value of light saturation point （LSP）, light compensation point （LCP） and maximum net photosynthetic rate （Pmax） decreased, too; （3） The photosynthetic rate and transpiration rate of Medicago sativa in the tree-grass system declined, the regularity of their curves also changed.

关 键 词：复合系统 紫花苜蓿 光合特性 蒸腾特性 

分 类 号：S718.5[农业科学—林学] S551.7