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中国沙漠  2014 

生物土壤结皮与种子附属物对4种荒漠植物种子萌发的交互影响

DOI: 10.7522/j.issn.1000-694X.2014.00021

Keywords: 生物土壤结皮,附属物,种子萌发,荒漠植物,古尔班通古特沙漠

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Abstract:

生物土壤结皮能直接或间接地影响维管植物种子萌发与群落建成,种子本身的生物学特征(如种子附属物等)对萌发也存在一定影响。本研究选取古尔班通古特沙漠4种常见的具有不同形态附属物的藜科植物(梭梭(Haloxylonammodendron)、粗枝猪毛菜(Salsolasubcrassa)、心叶驼绒藜(Ceratoidesewersmanniana)和角果藜(Ceratocarpusarenarius))种子,设置苔藓结皮、地衣结皮和裸沙3种土壤基质,通过去除或保留种子附属物,对比研究了生物土壤结皮与种子附属物对种子萌发的影响。结果表明:粗枝猪毛菜和梭梭的苞片显著抑制了种子萌发(p<0.05),心叶驼绒藜的柔毛和角果藜的刺状附属物对种子萌发没有显著影响(p>0.05)。与裸沙相比,苔藓结皮显著抑制了4种植物种子的萌发(p<0.05),地衣结皮显著抑制了粗枝猪毛菜种子的萌发(p<0.01),而对其他3种植物种子的萌发无显著影响(p>0.05)。同时,附属物与结皮对粗枝猪毛菜种子的萌发还具有交互作用,表现为显著抑制种子萌发(p<0.01)。可见,生物土壤结皮对具有不同附属物的荒漠植物种子萌发具有不同的影响,进而造成维管植物种子萌发的空间异质性,影响维管植物分布和多样性。

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