摘要
木棉在热带雨林的湿润气候和极端干旱的热带稀树草原环境下均能生长、开花结实良好,其果实特性和种子萌发对干旱的响应是否存在差异值得研究。对干热河谷（元江）、湿热地区（西双版纳）和干旱地区（临沧）木棉果实特性进行调查和种子萌发特性研究。结果表明：1）随PEG浓度增加,不同种源萌发率和萌发指数均呈下降趋势,在0-0.2 g/L浓度下临沧种源萌发率和萌发指数较干热河谷和版纳高,当浓度大于0.2 g/L时,种子萌发率大小为干热河谷〉临沧〉版纳种源,且当浓度为0.3 g/L时,版纳种子不能萌发;2）临沧和干热河谷种子在土壤含水量大于10%时能萌发,而版纳需土壤含水量大于15%时才能萌发,表明临沧和干热河谷种子较版纳抗旱,版纳种子在土壤含水量为40%时萌发率最大,且在60%的土壤含水量时仍有7%的种子萌发,体现其更能适应湿润环境。
Bombax ceiba can grow well with good flowering and fruiting in tropical savanna environment humid rainforest and extreme drought. The fruit characteristics and seed germination response to drought are worth studying whether there are differences or not. The investigation is studied from the kapok fruit and seed germination through the dry and hot valley（ Yuanjiang）,hot and humid areas（ Xishuangbanna） and arid areas（ Lincang）,Kapok fiber plantations of fruit cultivation,afforestation and forest regeneration in arid areas provide a theoretical basis. The results show the three points ：（ 1） with increasing of PEG concentrations,different provenances germination rate and germination index show a downward trend. From 0 g / L to 0. 2 g / L,germination rate and germination index of Lincang provenance are higher than those from dry and hot valley and Banna. When the concentration is greater than 0. 2 g / L,the germination rate is relatively as dry and hot valley size 〉 Lincang 〉 Banna. When the concentration is 0. 3g / L,the seeds from Banna could not germinate.（ 2） Lincang and dry- hot valley seed can germinate when soil moisture is greater than 10%,but Banna seed requires more than 15% of soil moisture,which showing Lincang and dry- hot valley seeds are relatively more drought- resistant than Banna. Germination of Banna seeds is at maximum when soil moisture is at 40%,under 60% soil moisture,7% of Banna seed are still germination,which reflecting its moist environment adaptability characteristics
出处
《林业调查规划》
2016年第3期25-28,共4页
Forest Inventory and Planning
基金
国家自然科学基金"云南热区木棉不同基因型抗旱性的比较研究(31260207)"
关键词
木棉种子
萌发特性
干旱胁迫
抗旱性
Bombax ceiba seed
germination characteristic
drought stress
drought resistance
