Effects of flooding and sedimentation on the growth and physiology of two emergent macrophytes from Dongting Lake wetlands
Effects of flooding and sedimentation on the growth and physiology of two emergent macrophytes from Dongting Lake wetlands
复制标题
洪水和沉积对洞庭湖湿地两种挺水植物生长和生理的影响
DOI：
10.1016/j.aquabot.2012.03.008
复制
发表时间：
2012-07-01
期刊：
影响因子：
1.8
通讯作者：
Li, Feng
中科院分区：
文献类型：
--
作者：
Pan, Ying;Xie, Yonghong;Li, Feng
本研究的目的是研究洪水和泥沙的相互作用对湿地植物性能的影响。耐淹种短毛苔草(Carex brevicuspis C.B.Clarke)和不耐淹种芒果(Miscanus carcharflorus(Maxim.)对洞庭湖湿地的驼鹿进行了两个水位(相对于地表0和40 cm)和三个埋藏深度(0，5和10 cm)的实验研究。除5 cm埋深+0 cm埋深处理外，较高埋深和较深埋深均显著抑制了两种藻类的生物量积累和相对生长速率(RGR)，说明浅埋可促进其生长。两种植物的生物量分配均受水位的单独影响，在40 cm水位下分配给叶片的生物量更多。与0 cm水位处理相比，40 cm水位处理下短花牡丹的ADH活性和可溶性糖含量较高，而蔗糖和淀粉的含量较低。在40 cm水位埋深对两种树种的生物量积累、相对生长率和淀粉含量无明显影响。这些结果表明，深埋只抑制植物的生长，而不是淹水，两个物种都可以通过调节生物量分配和碳水化合物代谢来适应淹水和/或沉积。(C)2012爱思唯尔B.V.保留所有权利。
The aim of this study is to investigate the interaction between flooding and sedimentation on the performance of wetland macrophytes. Growth, biomass allocation, alcohol dehydrogenase (ADH) activity and non-structural carbohydrate content of the flooding-tolerant species Carex brevicuspis C.B Clarke and the flooding-intolerant species Miscanthus sacchariflorus (Maxim.) Hackel from the Dongting Lake wetlands were investigated experimentally using two water levels (0 and 40 cm, relative to the soil surface) and three burial depths (0,5 and 10 cm). Biomass accumulation and relative growth rate (RGR) of both species were significantly inhibited by either higher water level or deeper burial, except for C. brevicuspis in the 5cm burial depth + 0 cm water level treatment, suggesting that shallower burial would stimulate the growth of C. brevicuspis. Biomass allocation of both species was affected by water level alone, and more biomass was allocated to leaves at the 40 cm water level. ADH activity and soluble sugar content of C. brevicuspis were higher, but soluble sugar and starch contents of M. sacchariflorus were lower in the 40 cm than in the 0 cm water level treatments. Biomass accumulation, RGR and starch content of both species were unaffected by burial depth at the 40 cm water level. These results suggest that deeper burial only inhibits plant growth without flooding, and that both species can acclimate to flooding and/or sedimentation through adjustments of biomass allocation and carbohydrate metabolism. (C) 2012 Elsevier B.V. All rights reserved.