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作 者 ：李连发;;廖建雄;江明喜;黄汉东;何东;

期 刊 ：武汉植物学研究 2010年 28卷 1期 页码：99-104

关键词：三峡库区；消落带；萌发特性；植被恢复；

Keywords:Three Gorges Reservoir Region, Water fluctuation zone, Germination characteristics, Vegetation restoration,

摘 要 ：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2.0 m)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 vindis)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.

Abstract: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 with seeds stored at two different conditions:dry storage and water submersion with different water levels (0. 5, 1.0, 2.0 m). Compared to the control, the 8 month dry storage enhanced the germination rate of 8 species (38. 1% of total species number), decreased that of 12 species (57. 1%), and didn’t have any impact on that of 1 species (4. 8%). As for the water submersion treatment,germination rate of 76.2% species was decreased,and that of 14. 3% species was increased and that of the rest 9. 5% species was not affected compared to the control, indicating that the germination rate of most species was reduced by water submersion. However, there was no significant difference between germination rate of seeds under different water levels. The germination rate of Amaranthus paniculatus,Amaranthus viridis, Amaranthus sp. after dry storage, and Eclipta prostrata after water submerged were more than 50%. Furhermore,they were able to fulfill their life history over course of water recession, thus these four species should be pdoritized for vegetation restoration via seed in this region. These findings have implications for the scheduling and management of restoration practices with seeds in the water fluctuation zone in TGRR.

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