生化他感作用与高寒草甸上人工草场自然退化现象的研究  

STUDY ON ALLELOPATHY AND NATURAL DEGENERATION PHENOMENA OF ARTIFICIAL GRASSLAND ON ALPINE MEADOW

作　　者：张宝琛[1] 白雪芳[1] 顾立华[1] 甄润德 

机构地区：[1]中国科学院西北高原生物研究所

出　　处：《生态学报》1989年第2期115-120,共6页Acta Ecologica Sinica

基　　金：国家自然辩学基金

摘　　要：细叶亚菊是海北地区垂穗披碱草人工草场上主要入侵杂草之一。本文探讨了垂穗披碱草和细叶亚菊草种间抑制与促进作用以及细叶亚菊各种代谢产物对垂穗披碱草种子萌发与幼苗生长的抑制作用。实验表明:在垂穗披碱草人工草场自然退化过程中存在着生化他感作用。牧草的自然退化速度与主要杂草入侵程度呈明显的相关性。Ajania tenuifolia is one of the main species of invasion weeds on artificial Elymus nutans grassland in Haibei. For the sake of proving that the relationship of allelopathy exists in the natural degeneration process of artificial E.nutans grassland, the experiments of intrespecific inhibitory effect of E. nutans interspecific inhibitory and stimulated effects between E.nutans and Ajania tenuifolia)inhibitory effects of various metabolites of A. Tenuifolia on the seeds germination and seedling growth of Elymus nutans have been carried out,, the results are as follows.1. The experimental results of intraspecific inhibitory effect of E. nutans showed that when the sowing densities raised from 0.2g/p.d to 0.4,0.6 and 0.8g/ p.d, the germination rales of seeds were reduced by 28.2, 34.9 and 39.6%,respectively, the germination time of 50% seeds was delayed by 5,20 and 30 hours respectively.2. The experimental results of interspecific inhibitory and stimulated effects of Ajania tenuiolia on seeds germination and seedling initial growth of Elymus nutans showed that when the mixed amount of Ajania tinuifolia seeds was 0.1g/p.d, compared with contrast, the germination rate of Elymus nutans seeds was reduced by 32.8%, their seedling height and root length were reduced by 10.9 and 4.5mm respectively. When the mixed amount of Elymus nutans seeds was 100/p.d, compared with contrast the germination rate of Ajania tenuifolia seeds could be raised by 3 times.3. The experiments results of inhibitory effects of Ajania Tenuifolia various metabolites on seeds germination and seedling growth of Elymus nutans showed that after the secretion of germinating Ajania tenuifolia seeds was separated into three parts by polyamide and XAD-4 resin. It was noticed that, the XAD-4'fraction had stronger inhibitory effect on seeds germination and seedling initial growth of E.nutans.The roots exudats of Ajania tenuifolia which was collected by XAD-4 rasin also has inhibitory effect.on the seedling initial growth of E. nutans. The volatile oil Ajania t

关 键 词：生化他感 人工草场 自然退化 

分 类 号：Q948.122.1[生物学—植物学]