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>>学科导航分类法 _农学 _作物学
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题名 人工埋藏条件下四种荒漠植物土壤种子库寿命
姓名 安宇轩
院系 草业农业科技学院
专业 作物栽培学与耕作学
学位名称 农学硕士
外文题名 Soil seed bank longevity of 4 desert plant species under field burial conditions
第一导师姓名 王彦荣
关键词 红砂;无芒隐子草;雾滨藜;蒙古虫实;土壤种子库;寿命
外文关键词 Reaumuria soongorica;Cleistogenes songorica;Bassia dasyphylla;Corispermum mongolicum;soil seed bank;longevity
学科 农学
摘要 本研究以内蒙古阿拉善干旱荒漠草原红砂+无芒隐子草植物群落4种植物红砂(Reaumuria soongorica)、无芒隐子草(Cleistogenes songorica)、雾滨藜(Bassia dasyphylla)及蒙古虫实(Corispermum mongolicum)种子库为对象,对其田间埋置一年间生活力动态进行了研究。结果表明: 1供试的4种植物种子库均显著下降。试验期间,约83%的红砂、90%的无芒隐子草及93%的雾滨藜通过田间萌发。其田间萌发主要集中在降雨相对丰富的时期。 2根据Thompson等(1993)的分类方法认为蒙古虫实种子为持久种子库,而其他三种植物为短暂种子库。 3 试验揭示了四种荒漠植物的繁殖策略:红砂和无芒隐子草主要为无性繁殖,雾滨藜为条件适宜集中萌发,而蒙古虫实则以休眠形式在土壤种子库中较长时期保存,其土壤种子库寿命有待于继续研究。
外文摘要 The research was conducted in Reaumuria soongorica–Cleistogenes songorica grassland in the Alax desert of Inner Mongolia, China. Four species were studied: Reaumuria soogorica, Cleistogenes songorica, Bassia dasyphylla and Corispermum mongolicum. Dynamics of seeds’ viability were monitored in one year's storage beneath the soil.The results showed that: 1. The viability of seed bank in the four kinds of plants dropped remarkably. During burial period, most seeds of Reaumuria soongarica (82%), Cleistogenes songorica (90%) and Bassia dasyphylla (93%) germinated in the field and the germination mainly occurred in the rainy season. 2. According to Thompson’s method, Reaumuria soongorica, Cleistogenes songorica, and Bassia dasyphylla could be assumed as transient soil seed bank, but Corispermum mongolicum is persistent soil seed bank. 3. Although most seeds of Reaumuria soongorica and Cleistogenes songorica germinated in the field, no seedling was observed in the plot. It indicated that the propagation of these two species were mainly through asexual reproduction other than seeds. For Bassia dasyphylla, most seeds germianted when the condition is favorable; and Corispermum mongolicum persisted in the soil seed bank and kept dormant.
研究领域 牧草(草坪草)育种与种子学
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