应用生态学报2013，Vol.24Issue(7)：1817-1825,9.
巨桉凋落叶分解初期对菊苣生长和光合特性的影响
Effects of Eucalyptus grandis leaf litter at its early stage of decomposition on the growth and photosynthetic characteristics of Cichorium intybus
摘要
Abstract
From March to May,2010,a pot experiment was conducted to investigate the effects of Eucalyptus grandis leaf litter at its early stage of decomposition on the growth and photosynthetic characteristics of Cichorium intybus.Four treatments with different application rate of the leaf litter,i.e.,0 g· pot-1(CK),30 g · pot-1(A1),60 g · pot-1(A2),and 90 g · pot-1(A3),were installed.Each pot contained 12 kg soil mixed with the leaf litter,and then,C.intybus was sown.The growth indicators of the C.intybus were measured at the 30,45,60,and 75 d after sowing,and the photosynthetic characteristics of the C.intybus in treatment A3 were studied after the seedlings third leaf fully expanded.At each measured time,the biomass accumulation and leaf area growth of C.intybus in treatments A1,A2,and A3 were inhibited significantly.At the early stage of the leaf litter decomposition,the synthesis of photosynthetic pigments of the C.intybus seedlings was inhibited significantly,and the inhibition effect was getting stronger with the increasing amount of the leaf litter addition.The diurnal change of the seedlings photosynthetic rate in all treatments showed a bimodal curve with midday depression,the stomatal conductance and water use efficiency had the same variation trend with the net photosynthetic rate,and the total diurnal photosynthesis decreased in the order of CK ＞ A1 ＞ A2 ＞ A3.The GC-MS analysis showed there were 33 kinds of small molecule compounds released gradually with the decomposition of the leaf litter,among which,allelopathic substance terpenoid dominated.关键词
巨桉/凋落叶/菊苣/化感物质/光合作用Key words
Eucalyptus grandis/leaf litter/Cichorium intybus/allelopathic substance/photosynthesis分类
农业科技引用本文复制引用
吴秀华,李羿桥,胡庭兴,陈保军,杨永贵,陈洪,胡红玲..巨桉凋落叶分解初期对菊苣生长和光合特性的影响[J].应用生态学报,2013,24(7):1817-1825,9.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）
