核桃凋落叶分解对萝卜生长和生理的影响  

Effect of Decomposing Walnut Leaf Litter on the Growth and Physiology of Radish

作　　者：王茜[1] 徐郑[1,2] 胡庭兴[1] 胡红玲[1] 陈洪[1] 史洪洲 

机构地区：[1]四川农业大学林学院,四川省林业生态工程重点实验室,四川雅安625014 [2]重庆市林业局,重庆市退耕还林管理中心,重庆401121

出　　处：《西北植物学报》2014年第12期2475-2482,共8页Acta Botanica Boreali-Occidentalia Sinica

基　　金：国家“十二五”科技支撑计划资助项目(2011BAC09B05);四川省教育厅项目(13ZA0246)

摘　　要：为考察核桃(Juglans regia L.)与冬性作物复合种植模式中凋落叶分解对作物生长的影响,该试验采用盆栽法,以冬性作物萝卜(Raphanus sativus L.)为受体,种入混有0、60、120和180g/pot核桃凋落叶的土壤中,并在萝卜生长过程中测定其形态、生理及生殖相关指标。结果表明:(1)萝卜地上部分的生长在凋落叶分解初期受到显著抑制,而在后期得到明显恢复。(2)在核桃凋落叶分解的影响下萝卜出现了明显的胁迫响应,特别是在分解初期和较高凋落叶量(120、180g/pot)处理下,光合色素含量受到明显抑制,叶片内活性氧含量增加,并在一定程度上受到渗透胁迫。(3)在测定时期内,萝卜叶片内MDA含量并未显著增加,即萝卜可通过自身调节抵御胁迫造成的危害。(4)萝卜在较高凋落叶剂量处理下,产出的种子颜色较深,且在180g/pot处理下产出的种子萌发率较低,种子质量受到明显影响。研究认为,土壤中核桃凋落叶分解初期能对萝卜造成化感胁迫,但长久来看不会降低萝卜产量;将两者复合种植时,可保留地面凋落叶,且最好在叶片分解一段时间后种植作物。In order to investigate the effect of decomposing walnut（Juglans regla L. ） leaf litter on the growth of crops in walnut and winterness crops intercropping system,we applied a pot experiment. Radish （Raphanus sativus L. ） seeds were sowed in the soil mixed with different amount of walnut leaf litter,and the indexes with respect to morphology,physiology and reproduction were determined as the radish grow- ing. The results showed as following： （1）The seedling growth of radish was significantly inhibited by de- composing leaf litter at the primary stage of leaf litter decomposition and recovered its growth afterwards. （2）The stress response of radish induced by walnut leaf litter was obvious,especially at the primary stage of leaf litter decomposition and with high amount of litter addition（120,180 g/pot）. It was indicated by de- crease of photosynthetic pigments, increase of reactive oxygen and the induced osmotic stress. （3）During the period of measurement,MDA content of radish leaf was not increased obviously, which indicated that the radish can recover from stress by auto-regulation. （4）The plants treated by large amount of leaf litter （i20,180 g/pot） produced darker seeds than that of the control and the plants treated by small amount of leaf litter（60 g/pot）. The plants treated by 180 g/pot leaf litter produced seeds with lower germination rate

关 键 词：农林复合 核桃 凋落叶 分解 化感效应 

分 类 号：Q945.79[生物学—植物学]