生态因子对水蕨生长的影响

通过移植和孢子繁殖试验,研究了生态因子对粤东地区水蕨生长的影响,结果表明,水蕨生长具有季节性变化,4-6月是水蕨生长高峰期,6月和12月开始形成孢子;水蕨孢子萌发和孢子体的发育均需要光照;光照4～10 h,水蕨孢子的成苗率显著提高,最高达82.4%;遮荫对水蕨叶柄基部直径、植株鲜重和干重有显著的抑制作用,导致叶柄纤细,易倒伏;光照显著促进水蕨叶的生长,使其抗伏性增强,并加速其孢子囊的成熟;基质(塘泥+河沙,其体积比为 4:1)培养能提高水蕨幼苗的成活率,促进水蕨孢子体的生长发育.

Effects of ecological factors on growth of Ceratopteris thalictroides

Effects of ecological factors on growth habit of Ceratopteris thalictroides in easten Guangdong was studied by experiments of transplantation and spore reproduction. Result showed that: there were seasonal changes in the growth of C. Thalictroides , its growth peak was from April to June , and spore began to form spore in June and December. Both germination of the spore and development of the sporophyte need light. Ratio of the spore germination of conspicuously increased when exposed to light for 4～10 hours, with its highest ratio up to 82.4% . Shadow significantly inhabited diameter of the petiole , decreased its wet weight and its dry weight, induced its thin petioles and lodge easily . While the light conspicuously increased the growth of C. Thalictroides, it also enhanced its antilodging and accelerated maturity of its sporangium . The survival ratio of seeding and growth of C. Thalictroides conspicuously increased in soil of pond mud and sand (bulk ratio 4:).