花椒品种间化感效应的差异

实验对4个常见的花椒品种(大红袍、汉源椒、大毛椒和七月椒)的化感效应进行了研究。花椒叶的浸提液分成2.5、5.0、10.0、20.0和40.0g·L-15个浓度,以紫花苜蓿种子作为受试植物。结果表明,与对照相比,各品种叶浸提液都显著地抑制了苜蓿种子萌发和幼苗生长,同时也促进了幼苗根和茎生物量的增加。4个品种间对种子萌发的化感效应有轻微的差异,而对幼苗生长和生物量的影响由于品种的不同而有所不同。4个品种叶的浸提液化感效应依次增强的顺序为:汉源椒、七月椒、大毛椒和大红袍。另外,花椒人工林地内的土壤对紫花苜蓿的生长发育也产生了显著的化感效应。最后,对4个花椒品种的叶挥发油进行了GC-MS化学成分分析,结果显示:不同品种的花椒体内化感物质的含量有区别,但它们的挥发油主要成分都包括桉树酚(cineole)、里哪醇(linalool)、乙酸里哪(醇)酯(linalylacetate)、β-石竹烯(beta-caryophyllene)和萜品-4-醇(terpinen-4-ol)等。

The study on varietal differences in allelopathic potential of Chinese prickly ash (Zanthoxylum piperitum)

Chinese prickly ash (Zanthoxylum piperitum) is an important cash crop in the mountain areas of the eastern Tibetan Plateau, especially in the fragile dry valleys of the upper Minjiang Rivers which is one of the most important branches of Yangtze River. Monoculture of the species on the slopes was a common practice which has caused serious soil erosion and many other problems such as serious pest and disease plagues, aborted seedling replant, and declined production. It is thus urgent for creating a suitable...