应用生态学报2012，Vol.23Issue(1)：1-8,8.
巨桉凋落叶分解对菊苣生长及光合特性的影响
Effects of Eucalyptus grandis leaf litter decomposition on the growth and photosynthetic characteristics of Cichorium intybus
摘要
Abstract
A pot experiment was conducted to study the effects of Eucalyptus grandis leaf litter during its early stage decomposition on the growth and the photosynthesis of Ckhorium intybus. Each pot contained 12 kg soil mixed with different amounts of E. grandis leaf litter (30 g · pot-1, A1; 60 g · pot-1, A2; 90 g · pot-1, A3; and 0 g · pot-1, CK) , and sowed with C. intybus. The growth indicators and the photosynthetic characteristics of C. intybus were measured after the third leaf of C. intybus seedlings fully expanded in treatment A,. At the early stage of leaf litter decomposition , the C. intybus biomass accumulation, leaf area growth, and synthesis of photosynthetic pigments were inhibited significantly, and the inhibition effect was getting stronger with the increasing amount of the leaf litter addition. The intercellular CO2 concentration of C. intybus was increased by litter addition, while the net photosynthetic rate, stomatal conductance, and transpiration rate were significantly lower than those of the control. With the increase of leaf litter addition, all the parameters of C. intybus light response and CO2 response except CO2 compensation point showed an obvious downward trend, and there existed significant differences between the treatments of litter additions and the control. It was suggested that during the decomposition of E. grandis leaf litter, its al-lelopathic substances released gradually and acted on receptor plants, inhibited the synthesis of photosynthetic pigments and the photosynthesis of the receptors, decreased the receptors environmental adaptation ability, and accordingly, inhibited the growth of C. intybus.关键词
巨桉/凋落叶/菊苣/化感/光合作用/农林复合系统Key words
Eucalyptus grandis/ leaf litter/ Cichorium intybus/ allelopathy/ photosynthesis/ agro-forestry system分类
农业科技引用本文复制引用
吴秀华,胡庭兴,杨万勤,陈洪,胡红玲,涂利华,泮永祥,曾凡明..巨桉凋落叶分解对菊苣生长及光合特性的影响[J].应用生态学报,2012,23(1):1-8,8.基金项目
"十一五"国家科技支撑计划项目(2008BADC2B01)、四川省重点学科建设项目(SZD0419)和四川农业大学"211工程"建设项目资助. （2008BADC2B01）
