不同生长阶段毛苔草(Carex lasiocarpa)克隆繁殖对水文情势的响应
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国家重点基础研究发展计划资助项目(2009CB421103);中国科学院“东北振兴”资助项目(DBZX-2-024)


Responses of Carex lasiocarpa clonal reproduction to water regimes at different growth stages
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    摘要:

    毛苔草为三江平原沼泽湿地分布区典型沼生植物。通过幼苗移植水位控制试验,研究不同生长期毛苔草克隆繁殖对水文情势的响应。结果表明,干湿交替条件下,毛苔草分蘖能力最强;苗期处理对后期分蘖有显著影响,后期水分增多明显促进分蘖,但不同经历的毛苔草分蘖对水分条件改变的响应速度不同。-5cm水位条件下,毛苔草根茎长度最大,而持续淹水15cm条件下,毛苔草根茎后期伸展最快。稳定水文条件的改变,抑制根茎生长,从波动水文情势转到稳定的水文环境中,根茎生长得到促进。-5cm水位条件下,毛苔草根茎生物量占总生物量的比重最大;而且水文情势改变后,无论苗期还是生长季末期,仍以经历-5cm水位处理的毛苔草根茎生物量比重较大。淹没对毛苔草的克隆繁殖具有明显的抑制作用。为实现湿地植被重建的目标,应综合考虑植物在不同环境中繁殖策略的差别,以及不同阶段水文需求的差别。

    Abstract:

    Responses of C.lasiocarpa clonal reproduction to water regimes, at different growth stages, was studied by seeding culture under controlled water regimes. Results showed that tillering ability of C. lasiocarpa, increased by sufficient water at later stage, was highest under alternate drying-wetting treatment, and influences of seeding stage water conditions on the ability embodied greatly in the later season. And C. lasiocarpa undergoing different water regimes had varied sensitivities to water level conversion. Rhizome was longest at -5cm water level,however, it stretched fastest under 15cm water level in the later season. Changes of stable water regimes inhibited rhizome growth, and changes from fluctuating regime to stable ones promoted its growth. Rhizomatic biomass percent was highest under -5cm water level, and after the change of the water regimes through the growing season, C.lasiocarpa undergoing -5cm water level treatment at beginning or the later growing season, had higher biomass percent. Submergence significantly inhibited the clonal reproduction of C.lasiocarpa. To reconstruct the vegetation in wetlands, plants reproduction strategies in varied environments and water requirements at each growing stage must be considered.

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王丽,宋长春*,胡金明,廖玉静.不同生长阶段毛苔草(Carex lasiocarpa)克隆繁殖对水文情势的响应.生态学报,2009,29(5):2231~2238

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