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Characteristics of seed rain of Haloxylon ammodendron in southeastern edge of Junggar Basin

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Author:: No author available

Journal Title:: Acta Ecologica Sinica

Issue:: 19

DOI:: 10.5846/stxb201107161059

Key Word:: 梭梭种群;种子雨密度;时间动态;空间格局;准噶尔盆地

Abstract：为了研究梭梭种子散布规律,通过布设种子雨收集器结合室内实验分析,对准噶尔盆地东南缘梭梭种子雨特征进行了研究.研究显示:(1)梭梭种子雨的累积密度达到平均189粒/m2,其中有活力种子占约80％；(2)种子散布的高峰集中在11月初到11月15日时间段,其落种量占整个种子雨的65％.其后种子雨密度随时间逐渐减小；(3)整个种子雨过程,不同时期散落的种子雨质量存在差异,表现为不同时期散落种子的萌发率呈现出先增大后减小的趋势；(4)变异函数分析表明,梭梭种子雨在8.12m的有效变程内,种子雨具有明显的空间格局,其由空间自相关和随机因素引起的空间异质性各占50.0％.准噶尔盆地东南缘梭梭种子雨密度大且质量较高,同时其时空分布异质性较高,这些特征均将影响梭梭种群的分布格局和种群更新.

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