| 毛乌素沙地3种飞播植物种群分布格局的研究 |
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| 引用本文： | 沈渭寿.毛乌素沙地3种飞播植物种群分布格局的研究[J].中国沙漠,1998,18(4):372-378. |
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| 作者姓名： | 沈渭寿 |
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| 作者单位： | 中国科学院兰州沙漠研究所 |
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| 摘 要： | 在播区水平和群落水平上，讨论了毛乌素沙地３种沙丘类型区飞播后，沙地由流动到半固定和固定状态的变化过程中，籽蒿、羊柴和花棒３个主要飞播植物种群分布格局的变化，以及各种状态下决定种群分布格局的主导因素。研究表明：在沙地处于流动状态下，不论是播区水平还是群落水平上，幼苗的分布格局都是由环境的空间异质性决定的；在半固定状态下，种群的分布格局是植物自身的生物生态学特性和环境因素共同作用的结果；而在固定状态下，种群的分布格局几乎全部是由植物自身的生物生态学特性所决定的。
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| 关 键 词： | 毛乌素沙地 飞机播种 植物种群 分布格局 |
DISTRIBUTION PATTERNS OF THREE MAIN AIR-SEEDING PLANT POPULATIONS IN THE MU US SANDY LAND |
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| SHEN Wei,shou.DISTRIBUTION PATTERNS OF THREE MAIN AIR-SEEDING PLANT POPULATIONS IN THE MU US SANDY LAND[J].Journal of Desert Research,1998,18(4):372-378. |
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| Authors: | SHEN Wei shou |
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| Abstract: | Based on the two levels or scales, i.e. the whole seeding area and the section colonized by plants, the changes of the distribution patterns of Hedysarum laeve, H. scoparium and Artemisia sphaerocephala and the dominant factors which determine the patterns after air seeding in the different kinds of moving dune areas in the Mu Us Sandy Land are discussed. On the whole seeding area level, in the gentle and flat sandy areas during the sapling period when the sand surface being moving state, the sapling populations are uniform distribution in pattern owing to the seeds being hardly reallocated by the topography and wind after air seeding. While in the sandy areas with high and dense sand dunes, the sapling populations are prone to colonial distribution in pattern and occasionally in chance distribution pattern. When the sand surface being semi fixed state, the three air seeding plant populations are dominated by the colonial distribution pattern. Under the condition of the sand surface being fixed state, A. sphaerocephala has basically receded from the seeding area and occasionally in colonial distribution pattern on the sections of the sand surface being partly eroded by wind. In gentle and flat sandy areas when the sand surface being fixed state, H. laeve occupies almost the whole seeding areas with uniform distribution pattern; while in the sandy areas with high and dense sand dunes, the population is colonial distribution in pattern. H. scoparium , being the sparse dispersal habit, is chance distribution in pattern in all kinds of sandy areas when the sand surface being fixed state. On the sections colonized by plants, in the sapling period when the sand surface being moving state, the three air seeding plant populations are all in colonial distribution pattern in all kinds of sandy areas. When the sand surface being semi fixed and fixed states, the distribution patterns are same with that on the whole seeding area level. Studies show that in sapling period when the sand surface being moving state, the distribution patterns are determined by the physical environmental conditions of the seeding area, especially by the dune developed degrees. Under the sand surface being semi fixed state the patterns are resulted from the interaction between the bio ecological properties of the plants and the physical conditions. When the sand surface being fixed states the bio-ecological properties of the plants decide the distribution patterns. |
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| Keywords: | Mu Us Sandy Land\ Air seeding\ Plant population\ Distribution pattern |
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