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The Ecological Characteristics of Seed Germination and Seedling Establishment of <i>Manglietia patungensis</i>: Implication for Species Conservation 被引量:3
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作者 Fangqing Chen Lei Liu +1 位作者 Faju Chen Guomei Jia 《American Journal of Plant Sciences》 2012年第10期1455-1461,共7页
Manglietia patungensis is an endangered species distributed aggregately in evergreen broad-leaved forest communities in Southwest China. A controlling experiment was employed to test the effects of soil type and shade... Manglietia patungensis is an endangered species distributed aggregately in evergreen broad-leaved forest communities in Southwest China. A controlling experiment was employed to test the effects of soil type and shade degree on seed germination and seedling establishment by using four soil types and three shade treatments with five replicates. Results showed that the germination rate of M. patungensis seeds was relatively low ranging from 19% to 31%. Shade degree and soil type had no significant effect on seed germination rate, but influenced germination dynamics. Both shade degree and soil type treatments significantly affected seedling survival and seedling growth. Seedling survival rate increased with increasing light density. Increased light also promoted biomass accumulation and root development of seedlings. The biomass of the seedlings under full light condition increased 72% comparing with the seedlings under 80% shade degree. Root depth, root area and cross number increased with the increase of light density. Seedlings on farmland soil survived better than that on other three kinds of soil. The seedling survival rate in the farmland soil reached 91.4%, but was reduced to 80.3%, 78.0% and 52.8% in old-field soil, sandy soil and forest soil respectively. Total biomass, aboveground biomass and root biomass of seedlings in forest soil was the highest, followed by seedlings in sandy and old-field soils respectively, and seedlings in farmland soil ranked the least. Some suggestions were finally put forward for the conservation of M. patungensis based on the research results. 展开更多
关键词 Soil Type SHADE Degree Seed Germination SEEDLING Survival MANGLIETIA patungensis
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濒危植物巴东木莲种子休眠与萌发特性的研究 被引量:62
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作者 陈发菊 梁宏伟 +2 位作者 王旭 何正权 李凤兰 《生物多样性》 CAS CSCD 北大核心 2007年第5期492-499,共8页
巴东木莲(Manglietia patungensis)为我国特有种,属国家重点保护植物。为找出其生殖环节中的致危因素,作者对巴东木莲种子休眠与后熟过程中的形态和萌发特性进行了研究。结果表明,巴东木莲种胚发育不完全可能是种子休眠的主要原因,在其... 巴东木莲(Manglietia patungensis)为我国特有种,属国家重点保护植物。为找出其生殖环节中的致危因素,作者对巴东木莲种子休眠与后熟过程中的形态和萌发特性进行了研究。结果表明,巴东木莲种胚发育不完全可能是种子休眠的主要原因,在其后熟过程中胚不断分化、发育成熟;种皮具有较好的透性,与休眠的关系不大;种子不同部位均存在萌发抑制物,胚乳中高含量的萌发抑制物是影响胚萌发的重要因素。内源激素ABA和IAA在巴东木莲种子休眠与萌发过程中起着重要作用,ABA是引起休眠的关键因素,IAA有助于种子的萌发,IAA/ABA相对含量的变化对种子的休眠和萌发产生重要影响。巴东木莲种子的休眠是由种子本身的形态和生理特点引起的综合休眠,在4℃低温保湿条件下才能完成其形态和生理后熟过程,而自然条件下,巴东木莲种子成熟时正值秋季少雨,很容易失水而不能完成其后熟过程而失去生活力,这可能是导致该物种自然更新困难的重要原因。 展开更多
关键词 MANGLIETIA patungensis 形态后熟 生理后熟 种子萌发
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