The Reproductive Traits of Rare Desert Species Eremosparton songoricum (Fabaceae) at Two Sites With Different Soil Water Content
The Reproductive Traits of Rare Desert Species Eremosparton songoricum (Fabaceae) at Two Sites With Different Soil Water Content
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沙漠珍稀物种Eremosparton sonoricum（豆科）在两个不同土壤含水量地点的繁殖特性
DOI：
10.5958/j.2229-4473.26.1.001
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发表时间：
2013
期刊：
影响因子：
--
通讯作者：
Huiliang Liu
中科院分区：
文献类型：
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作者：
Xiang Shi;Jiancheng Wang;Daoyuan Zhang;Huiliang Liu
准噶尔无叶草Eremosparton songoricum（Litv.）瓦斯在野生条件下经历不同的土壤水分有效性，这表明土壤水分的变化与该物种的生态相关。对E.在古尔班通古特沙漠水分资源异质性较强的两个种群中，即水分条件较好的河岸荒漠种群A和水分条件较差的腹地荒漠种群B，研究了干旱胁迫对准噶尔盆地东部荒漠草原结果表明：5月下旬至6月下旬，种群A和B的花期分别为25 d和21 d;群体B的单花开放期、单株开花分支数、每花分支花序数、每花序花数和百粒种子质量显著低于群体A，而单花泌蜜量、有效传粉者访花率、访花时间和坐果率显著高于群体A。种子对干旱没有反应。结果表明，E.在种群B中，准噶尔香蒲的花展较小，这可能是其对干旱生境的适应策略，从而节省了更多的花蜜资源。种群B的百粒种子质量较小，有利于在适宜的生境条件下扩大扩散距离，这是因为扩散果实的重量较轻。因此，在干旱生境下，较小的花大小有利于E. songuricum。
Eremosparton songoricum (Litv.) Vass. experiences different soil water availabilities under wild conditions, suggesting that variation in soil water is ecologically relevant for this species. The reproductive traits of E. songoricum were estimated in response to drought and were compared in two populations with highly heterogeneous water resources in the Gurbantunggut Desert: Population A at the riverside desert with better water condition and Population B at the hinterland desert with worse water condition. Results showed that the duration of flowering lasted for 25 d and 21 d for population A and B respectively from late May to late June. In population B, the anthesis of a single flower, flowering branch number per plant, inflorescence number per flowering branch, flower number per inflorescence, and seed mass of a hundred seeds were significantly lower, however, the nectar secretion per flower, visitation rate by effective pollinators, duration of visit on each flower, and fruit set were significantly higher than in population A. Seed set didn't respond to drought. Results showed that E. songoricum produced smaller floral display sizes in population B which might save more resources for nectar production, thereby eliciting long duration on flowers and more fruit set, which are the adaptative strategies to droughty habitat. Mass of hundred seeds was smaller in population B, which is an advantage in extending the dispersal distance under favorable habitat because of the decreased weight of the dispersal fruit. Thus the smaller floral sizes will be advantageous in maintaining reproductive success under drought habitats for E. songuricum.