浇水频率和凋落物覆盖量对黧蒴锥种子萌发及幼苗存活的影响  

Effects of litter coverage and watering frequency on seed germination and seedling survival of Castanopsis fissa.

作　　者：王俊[1] 王卓晗[1] 杨龙[1] 任海[1] 

机构地区：[1]中国科学院华南植物园鹤山森林生态系统国家野外科学观测研究站

出　　处：《应用生态学报》2008年第10期2097-2102,共6页Chinese Journal of Applied Ecology

基　　金：国家自然科学基金项目(30670370);广东省自然科学基金项目(07118249);广东省和广州市科技攻关资助项目(2007J1-C0471、2006B60101034)

摘　　要：黧蒴锥是华南用于人工造林和生态恢复的优良乡土树种.选取浇水频率和凋落物覆盖量两个控制因子,研究在不同的土壤湿度和凋落物覆盖量条件下,黧蒴锥种子萌发及幼苗存活和生长特征.结果表明:凋落物对黧蒴锥种子萌发和幼苗生长的影响与环境的潮湿程度相关.当浇水频率为每天1次时,凋落物覆盖会抑制黧蒴锥种子萌发和幼苗早期生长,导致种子萌发率降低、幼苗死亡率提高;在浇水频率为2 d 1次和3 d 1次时,凋落物覆盖可以改善土壤的水分状况,有助于种子萌发和幼苗存活.凋落物覆盖还可以显著地提高幼苗的生物量.在通过播种来实现亚热带灌木林地更新时,可利用凋落物覆盖促进黧蒴锥的种子萌发和幼苗存活.Castanopsis fissa is an important pioneer species commonly used in the restoration of degraded subtropical grassland in southern China. The study on the effects of litter coverage and watering frequency on the seed germination and seedling survival of C. fissa showed that the effects of litter coverage depended on soil moisture condition. When the watering frequency was 1 time per day, litter covering could restrain seed germination and increase seedling mortality; while watering 2 or 3 times per day, the covering would ameliorate soil moisture condition, and benefit seed germination and seedling establishment. The biomass of C. fissa seedlings was enhanced significantly by litter covering. It was suggested that keeping a litter layer on soil surface could benefit the seed germination and seedling survival of C. fissa to restore subtropical shrub land.

关 键 词：黧蒴锥 浇水频率 凋落物覆盖 土壤湿度 种子萌发 幼苗生长 

分 类 号：Q945[生物学—植物学]