南京林业大学学报（自然科学版）2017，Vol.41Issue(3)：29-36,8.DOI:10.3969/j.issn.1000-2006.2017.201512044
香樟凋落叶分解对几种园地作物抗性生理和土壤氮组分的影响
Effects of decomposingleaf litter of Cinnamomum camphora on the resistance physiology of three intercropping crops and activity of the organic nitrogen fraction
摘要
Abstract
[Objectives] A pot experiment was conducted to investigate the allelopathic effect of decomposing leaf litter of camphor (Cinnamonmm camphora) on the growth and resistance physiology of three recipient crops:cabbage (Brassica chinensis),lettuce (Lactuca sativa) and eggplant (Solanum melongena).[Methods]Through potted trial,the annual amount of leaf litter per unit area was uesd as the basic amount of litter in this experiment,four levels of leaf litter addition were applied to the soil (namely A1(25 g/pot),A2(50 g/pot),A3(100 g/pot) and CK (no leaf litter added).Repeated five times for each treatment,the total amount of three crops were 60 pots.After the treatment,on a regular basis,the plant growth index (height and diameter) and resistant physiological index (superoxide dismutase,catalase and peroxidase) and the contents of soil nitrate and ammonium nitrogenfor crop growth were measured.[Results] The decomposing camphor leaf litter showed inhibiting effect on ground diameter and height of the three recipient crops.The inhibition effect on the recipient crops was enhanced with the increment of leaf litter,but with the extension of decomposition time the inhibition effect tended to weaken and even showed the promotion effect on recipient crops;At the early stage (20-40 d) of decomposition of leaf litter,the activities of superoxide dismutase (SOD) and catalase (CAT) were inhibited with the increase of leaf litter addition,and the activity of peroxidase (POD) was increased.After 80 d of decomposition,the activity difference of CAT,SOD and POD were significantly decreased.Different addition during a certain period (30-50 d) remarkably reduced the content of soil mineral nitrogen (nitrate nitrogen and ammonium nitrogen).The sensitive levels of different recipient plants to the allelopathic inhibition of decomposing camphor leaf litter were different.The inhibition effect on lettuce was the strongest,while the inhibition effect on eggplant was the weakest.[Conclusions] With the extension of decomposition time the inhibition effect tended to weaken.Based on the results above,we concluded that the decomposing camphor leaf litter affected the growth of recipient crops directly or indirectly by releasing allelochemicals,thus the vegetative growth of rccipicnt crops was limited,and accordingly the accumulation of biomass was decreased.关键词
香樟/凋落叶分解/抗性生理/氮组分/化感作用Key words
camphor (Cinnamomum camphora)/leaf litter decomposition/resistance physiology/organic nitrogen fraction/allelopathy分类
农业科技引用本文复制引用
张如义,胡红玲,吕向阳,陈洪,杨珊珊,胡庭兴..香樟凋落叶分解对几种园地作物抗性生理和土壤氮组分的影响[J].南京林业大学学报（自然科学版）,2017,41(3):29-36,8.基金项目
“十二五”国家科技支撑计划(2011BAC09B05) （2011BAC09B05）
四川省教育厅重点项目(13ZA0246) （13ZA0246）
