绵阳新桥镇防护林体系桤柏混交林光合作用日变化研究Researches on Daily Photosynthetic Variations in Mixed Alder and Cypress Forest of the Protection Forest System in Xinqiao TownshiP or Mianysng City
向永国,王金锡,廖光瑶,王道木,朱顺全
Xiang Yongguo;
摘要(Abstract):
本文利用美国产LI—6200便携式光合作用分析系统、LI—3000叶面积仪配合照度计、通风干湿球温湿度计、土壤湿度计等测定了绵阳新桥防护林体系生长季节中桤柏混交林树种南、北面叶片光合作用每小时日变化进程,探讨了桤木和柏木光合作用率及其变动程度,指出了它们的光合作用日变化类型,从日射量、温度、CO2浓度等外界条件及内生节奏方面阐述了光合作用日变化机理,同时计算和分析了桤柏混交林平均光合作用率日变化类型和量子产额。结果表明桤木光合作用日变化为中午降低型,柏木为正规型曲线,桤木上午光合作用率高于下午,柏木为上午低于下午,它们都具有较高的量子产额,其光合作用日变化不存在着时间效应,为防护林功能研究提供依据。
Researches were directed toward dally photosynthesis variations of southern and northern leaf blades everyhour during the growing seasons in mised alder and cypress forest by means.of some scientinc instruments,anddiscussion was mace on the photosynthetic rates of alder and cypress,their variation degrees,their daily variationtypes,etc.
关键词(KeyWords):
桤柏混交林,光合作用日变化,量子产额
Mixed alder and cypress forest,daily photosynthetic variation, quantum yield
基金项目(Foundation): “八五”国家科技攻关计划
作者(Authors):
向永国,王金锡,廖光瑶,王道木,朱顺全
Xiang Yongguo;
DOI: 10.16779/j.cnki.1003-5508.1994.02.003