几种酚酸对毛竹种子发芽的影响

针对连续多年覆盖后雷竹林产生的衰退减产问题,从竹林覆盖物料对竹子的化感作用角度对衰退的原因进行了分析.利用外施不同浓度和种类的酚酸以及稻草、竹叶水浸液对毛竹种子进行发芽实验,以探求酚酸等化感物质对竹子生长的影响.试验结果表明,随处理液浓度的上升,几种酚酸和稻草、竹叶水浸液对毛竹种子的抑制作用增强.稻草、竹叶2种覆盖物1倍浸提母液处理后长出的种子胚根迅速失活死亡,5、10倍2种浸提母液对发芽势、胚根长度、胚根质量有促进作用.100 mg·L-1酚酸或混合酚酸液使胚根长度与对照相比减少24.49%～48.99%,胚根质量减少9.17%～38.08%;500 mg·L-1酚酸或混合酚酸液可使胚根长度减少73.48%～88.63%,胚根质量减少76.00%～90.83%.据此认为,覆盖物产生并在土壤中累积的大量酚酸可抑制竹林根系生长,并导致雷竹林经连续多年覆盖后衰退和减产.

Effects of Several Phenolic Acids on Germ ination ofPhy llostachys heterocycla Seeds

A fter cont inual covering for several years, the y ield and quality ofPhyllostachy s p raecox w ill decline seriously. A imedat at th is problem, w e detected the effects from a llelo-chem ica ls of the materia ls w hich are used forcovering. The so lution of several pheno lic ac ids, includ ing p-hydroxy benzo ic acid, van illic acid, p-coumaric acid,feru lic acid and the irm ix ture, and d istilled so lu tion o f different concentrat ions from rice straw and bamboo leavesw ere used on germ ination o fP hyllo stachys heterocy cla seeds. Mother d istilled so lution made radical dead in a shorttime, but bo th 5 and 10 t imes of mo ther solution promoted length and w e igh t of radica;l 100 mg?L- 1 is the low estconcentration o f pheno lic acids so lution and the irm ix ture, the leng th o f rad icalw hich treated by them was 24. 49%~ 48. 99% less than the contro,l 9. 17% ~ 38. 08% w as the w eigh;t compare w ith 100 mg? L- 1, the length andthe w eight o f radicalwh ich treated by 500mg?L- 1 w ere 73. 48% ~ 88. 63% and 76. 00% ~ 90. 83% less than thecontro l, respectively.