不同生长阶段毛苔草地下部分对水文情势的生长响应

Responses of Carex lasiocarpa Underground Part to Water Regimes at Different Growth Stages

摘要: 通过幼苗移植水位控制试验，研究了毛苔草地下部分对不同水文情势的生长响应，同时比较研究了水文情势在其不同生活史阶段的影响。结果表明，−5 cm水位条件下，毛苔草根茎最长，持续淹水条件下，毛苔草根茎伸展最快；后期水分充足有力于根茎伸展，但无法超越苗期水文影响；稳定水文条件的改变抑制根茎生长，而从波动水文情势到稳定水文环境的转变，则促进根茎生长。毛苔草不定根长度，旺盛期，随水分条件的增加而变小；后期，在持续淹水条件下伸展较快，但−5 cm水位条件下的仍然最长。

Abstract: The characters of C. lasiocarpa underground part were studied to find its responses to different water regimes and growth strategies through different water experiences. The main conclusions were as follows: rhizome was longest at −5 cm water level and stretched fastest under constant flooding. Sufficient water at the later growing period was favorable for rhizome stretching, but could not compensate the inhibition of seeding stage water regimes. Changes of stable water re-gimes inhibited rhizome growth, and changes from fluctuating regime to stable ones promoted its growth. Adventitious roots length increased as the water decreased in the thriving growth period, and increased fast later under constant flooding, but was still longest at −5 cm water level.