环境条件对马尾松和藜蒴种子萌发率的影响

Effects of Environmental Conditions on the Rate of Seed Germination of the Pinus massoniana and Castanopsis fissa

对广东南亚热带森林次生演替的先锋树种马尾松和次生演替过渡种藜蒴的种子萌发与环境条件的关系进行了对比研究，结果表明：弱光照强度对马尾松种子的萌发有一定的影响；土壤的含水量对其影响稍弱，关联度ｒｉｊ＝０．６１３４：芒萁浸泡液和混交林凋落物浸泡液对马尾松种子萌发的影响较藜蒴种子萌发小，对藜蒴种子萌发有明显的抑制作用，萌发率分别是对照组的２７．３％和６３．６％：而马尾松种子萌发的相应值分别是５０％和７５％；藜蒴种子萌发还受土壤含水量的影响，关联度ｒｉｊ＝０．７０３９，较马尾松的相应值大，从而说明马尾松作为先锋树种优先占领荒坡芒箕草地在其种子萌发方面有一定的优势．

This paper deals with the comparative study on the relationship between the rate of the pinus massoniana and Castanopsis fissa seed germination and the conditions of environment (P.massoniana is a pioneer tree and C.fissa is a transitional tree in the secondary forest).The results show that the seed germination of P.massoniana and C.fissa are differently inhibited by the soak of total plant Dicra- nopz.pe.zoandthendxedforestlitterithefonmerare50.and75.tothecon.t,sandthelatter are 27.3% and 63.6% to the contrast's ;the rate of seed germination of this two species are effected weekly by illuminance and soil-moisture ;the degress of relatedness(r)of P.massoniana are 0.6206 and 0.6134, and that of C.fissa are 0.6587 and 0.7139. The seed germination of C.fissa is resisted by the soak of D.Pedata and the moisture of soil.So the good germination of seeds in important for pio- neer tree──P.massoniana in the secondary forest succession.