Ⅰ-69杨和毛白杨光合性能的研究  

STUDIES ON PHOOTOSYNTHETIC PROPERTIES OF POPULUS DELTOIDES cv. "LUX" EX. 1-69/55 AND P.TOMENTOSA

作　　者：裴保华[1] 董仕先 祝铁军 

机构地区：[1]河北林学院

出　　处：《林业科学》1992年第4期297-301,共5页Scientia Silvae Sinicae

基　　金："七.五"国家科技攻关课题"杨树人工林集约栽培技术"75-07-03

摘　　要：采用红外线CO_2分析法研究了I-69杨和毛白杨光合速率与光强、CO_2浓度、叶龄等的关系;用改良干重法研究了I-69杨光合速率的日进程和年进程;研究了叶绿素含量、比叶重、单片叶面积变化的年进程。结果表明,I-69杨的光饱和点与毛白杨相近,光补偿点高于毛白杨,CO_2补偿点比毛白杨低。I-69杨的净光合速率高,功能叶数量多,功能期长,这些是I-69杨比毛白杨速生的基础。I-69杨在高温、湿润的季节(7、8月)光合日进程仍表现为双峰曲线,说明它对水分亏缺很敏感。I-69杨的光合年进程也表现为双峰曲线,峰期分别出现在6、7月和10月。8月光合速率降低是和单片叶面积增大、叶绿素含量降低和比叶重下降有关的。此外,在速生时期矿质和氮素营养缺乏可能是光合速率降低的外部原因。The authers researched the relations of photosynthetic rates with light intensity, CO_2 concentration and leaf age in P. deltoides (Ⅰ-69) and P. tomentosa by infared-CO_2-analysis method, and the daily and yearly progresses of photosynthetic rate of P. deltoides(Ⅰ-69) by improving dry weight method, as well as the yearly progresses of changes in chlorophyll content, specific leaf weight, single leaf area. It is shown that the light saturation point of P.deltoides(Ⅰ-69)is similar to that of P. tomentosa, but light compensation point is higher, CO_2 compensation point is lower than that of P. tomentosa. The higher net photosynthetic rate, more founction leaves and longer period of founction leaf of P. deltoides are the bases of more rapid growth. The two-peak curve of daily photosynthetic progress of P. deltoides even during the period of high temperature and moisture (July and August) indicates that P. deltoides is sensitive to water deficit. The yearly photosynthetic progress is also in two-peak curve, which appears in June to July and October respectivly. The lower photosynthetic rate of P. deltoides in August is related to its larger single leaf area, lower chlorophll content and smaller specific leaf weight. Otherwise, the lower mineral and nitrogenous nutration during quick growth period are the external causes for it.

关 键 词：I-69杨 毛白杨 光合性能 

分 类 号：S792.110.1[农业科学—林木遗传育种]