油松、辽东栎混交林中生化他感作用的研究

研究了油松（ＰｉｎｕｓｔａｂｕｌａｅｆｏｒｍｉｓＣａｒｒ．）、辽东栎（ＱｕｅｒｃｕｓｌｉａｏｔｕｎｇｅｎｓｉｓＫｏｉｄｚ．）混交林中的生化他感作用，结果表明：油松、辽东栎纯林及松栎混交林下的枯落叶、半分解枯落叶及表层土壤水浸液对油松及其它植物的种子发芽和幼苗胚根、幼茎生长有显著的影响，一般在高浓度下表现为强烈的抑制作用，低浓度下作用不显著或起促进作用。其中辽东栎枯落叶水浸液的抑制作用最为强烈，混交林中枯落叶的抑制作用有所下降。说明在某些条件（干旱、混交比例和混交方式不当）下，两树种混交可引起林地生化他感物质富积，从而导致油松生长不良，林地生产力下降。解释了实际林地的现象，为营造松栎混交林提供了依据。

THE STUDY OF ALLELOPATHY IN THE MIXTURE OF PINUS TABULAEFORMIS AND QUERCUS LIAOTUNGENSIS

The allelopathy in the mixture of Chinese Pine (Pinus tabulaeformis)and Liaotung Oak (Quercus liaotungensis) is studied. The results show that:The leachates of litter,half decaying litter and surface layer soil under Pineoak mixture and each pure stand have significant effect on seed germination, seedling radicle and stem growth of Chinese Pine and other plants.Generally, the leachates of higher concentration show significant inhibitory effect and those of lower ones show stimulate effect or no effect. In laberatory,pine seed germination, seedling radicle and stem growth treated by oak litter leachate(1:10)were showed to be reduced by 40.4%, 25.5% and 12.8 %.The inhibitory effect of litter in mixture (1:10) is lower than those of two pure stands. Studies indicate that mixed planting of Pine and Oak can lead to accumulating heavily of allelopathic chemicals in the stand in some conditions(such as drought, no proper mixture proportion and pattern). This can cause poor growth of Chinese Pine and forest production reduced. The phenomenon of nature Pine-Oak mixed stands is explained and Scientific basis for planting Pine-Oak mixture is provided.