干藏和淹水对三峡库区21种草本植物种子萌发的影响

研究了三峡库区河岸带21种常见草本植物种子在干藏以及不同淹水深度（0.5、1.0和2.0m）处理下的萌发特性。结果表明：以新采集种子的萌发率作为对照,干藏后8个物种的萌发率增加（占总数的38.1%）,1种萌发率不变（4.8%）,12种萌发率降低（57.1%）。与对照相比,淹水后3个物种的萌发率增加（占总数的14.3%）,2个物种的萌发率不变（9.5%）,16个物种的萌发率下降（76.2%）。水淹处理后,占总数76.2%的物种的萌发率下降,其中11种显著下降;但淹水深度对种子的萌发没有显著影响。干藏后的繁穗苋（Amaranthus paniculatus）、皱果苋（Amaranthus viridis）和红刺果苋（Amaranthus sp.）以及水淹后的鳢肠（Eclipta prostrata）萌发率〉50%,而且能够利用库区退水期完成生活史形成种子,表明这些植物可作为三峡库区消落带植被恢复时优先考虑的物种源。

Effects of Dry Storage and Water Submersion on Seed Germination of 21 Herbaceous Species Indigenous to the Three Gorges Reservoir Region

Regeneration using seed is an important measure for wetland vegetation restoration,and the germination requirements,especially responses to water submersion,are the fundamental information for selecting suitable species as seed sources.In order to select seed sources for vegetation restoration in the water fluctuation zone of the Three Gorges Reservoir Region (TGRR),we collected 21 herbaceous species indigenous to the riparian zone of TGRR,and set the germination rate of fresh seeds as control to compare wi...