Effects of dry storage and water submersion on seed germination of 21 herbaceous species indigenous to the Three Gorges Reservoir Region.

Li Lianfa, L. Jianxiong, Jiang Mingxi, Huang Handong, He Dong
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引用次数: 3

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 prioritized 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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干库和浸水对三峡库区21种草本植物种子萌发的影响
种子再生是湿地植被恢复的一项重要措施,而种子萌发需求,特别是对浸水的响应是选择种子源的基础信息。为了选择三峡库区消落带植被恢复所需的种子来源,收集了三峡库区河岸带特有的21种草本植物,并以新鲜种子的萌发率为对照,与不同水位(0.5、1.0、2.0 m)下干储和浸水两种不同条件下的种子进行比较。8个月干贮藏使8种植物的发芽率提高(占总种数的38.1%),使12种植物的发芽率降低(占总种数的57.1%),对1种植物的发芽率没有影响(占总种数的4.8%)。与对照相比,浸水处理降低了76.2%的种子发芽率,提高了14.3%的种子发芽率,其余9.5%的种子发芽率未受影响,说明浸水处理降低了大部分种子的发芽率。不同水分条件下种子发芽率无显著差异。细穗苋、绿苋菜、干贮藏后的苋菜和浸水后的黄花的发芽率均在50%以上。此外,这4种植物能够在水分衰退过程中完成其生活史,因此应优先考虑通过种子恢复该地区的植被。这些研究结果对三峡库区消落带种子恢复措施的规划和管理具有一定的指导意义。
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Effects of nitrogen, phosphorus, and potassium fertilizer on the growth, blossom, and N, P, K uptake in Calendula officinalis L. Comparisons of leaf traits among different functional types of plant from Huoshan Mountain in the Shanxi province. Effects of dry storage and water submersion on seed germination of 21 herbaceous species indigenous to the Three Gorges Reservoir Region. Effect of NaCl stress on electrical impedance spectroscopy parameters and membrane permeability of moso bamboo (Phyllostachys edulis) seedling leaves.
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