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首页> 外文期刊>Plant and Soil >Burial of canopy-stored seeds in the annual psammophyte Agriophyllum squarrosum Moq. (Chenopodiaceae) and its ecological significance.
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Burial of canopy-stored seeds in the annual psammophyte Agriophyllum squarrosum Moq. (Chenopodiaceae) and its ecological significance.

机译：埋藏在一年生沙生植物Agriophyllum squarrosum Moq中的冠层存储种子。 （藜科）及其生态学意义。

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摘要

Agriophyllum squarrosum Moq. is a dominant annual on sand dunes in the arid regions of central Asia. A high percentage of seeds is retained on dead plants which become covered by moving sand, but little is known about the ecological significance of burial of canopy-stored seeds. We investigated the size and dynamics of the buried canopy-stored seed bank and effects of burial on seed germination. In March (during the windy season), May (beginning of the germination season), and July (middle of the growing season), the number of seeds per square meter in sample plots in the dunes was 623, 223 and 22, respectively, with 54.6, 30.6 and 12.9% of the total seeds retained on buried plant canopies. In a controlled experiment, more seedlings emerged from released (dispersed) than from canopy-stored seeds when burial depth was the same. No viable ungerminated released seeds were found, but 45-80% of the ungerminated canopy-stored seeds were viable. In general, with an increase in applied water germination of released seeds buried at a depth of 1 or 2 cm and of canopy-stored seeds buried at 1 cm increased, but regardless of watering regime few or no released seeds at 4 cm or canopy-stored seeds at 2 or 4 cm germinated. Significantly more seedlings emerged from plants buried in a horizontal than in a vertical position. Seedlings originating from buried canopy-stored seeds on an active dune accounted for only 5.4% of the total seedlings emerging, and most of them emerged later than those from released seeds. Thus, seed release is more effectively postponed in buried than in exposed canopies, and burial of canopy-stored seeds is a mechanism that helps regulate seed germination and seedling emergence of A. squarrosum on active dunes..
机译：沙枣（Agriophyllum squarrosum）最小起订量。是中亚干旱地区沙丘上的主要种群。死种子上保留着高比例的种子，这些种子被移动的沙子覆盖，但对埋藏有冠层种子的生态学意义知之甚少。我们调查了埋藏的华盖种子库的大小和动态以及埋葬对种子发芽的影响。在3月（大风季节），5月（发芽季节开始）和7月（生长季节的中间），沙丘样地中每平方米的种子数分别为623、223和22。保留在埋藏的植物冠层上的种子总数的54.6％，30.6％和12.9％。在一个对照实验中，当埋葬深度相同时，释放（分散）的种子比冠层存储的种子更多。未找到可行的未发芽的已释放种子，但是未萌发的冠层储存种子中有45-80％是可行的。总的来说，随着施用水的发芽量增加，埋在1或2厘米深度处的已释放种子和埋藏在1厘米处的冠层贮藏的种子均增加，但是无论浇水方式如何，在4厘米处或冠层中释放的种子很少或没有。种子在2或4厘米处发芽。从水平方向掩埋的植物中萌出的幼苗明显多于垂直方向。来自活跃沙丘上埋藏的树冠存储种子的幼苗仅占萌发幼苗总数的5.4％，并且大多数萌发都比释放的种子晚。因此，埋入地下的种子释放比裸露的屋顶更有效地推迟了种子的释放，埋葬存储在屋顶上的种子是一种机制，可以帮助调节活跃沙丘上方格种子的萌发和幼苗出苗。

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