The overgrowth of Zizania latifolia in a subtropical floodplain lake: Changes in its distribution and possible water level control measures
The overgrowth of Zizania latifolia in a subtropical floodplain lake: Changes in its distribution and possible water level control measures
复制标题
DOI：
10.1016/j.ecoleng.2016.01.069
复制
发表时间：
2016-04
影响因子：
3.8
通讯作者：
Xiaoke Zhang;A. Wan;Huili Wang;Liangliang Zhu;Jian Yin;Zhigang Liu;Daoping Yu
中科院分区：
文献类型：
--
作者：
Xiaoke Zhang;A. Wan;Huili Wang;Liangliang Zhu;Jian Yin;Zhigang Liu;Daoping Yu
武昌湖是长江中游的一个浅水湖泊。历史上，它与长江干流自由相连，以沉水植物为主。1959年，万河闸为捕鱼和防洪，阻断了河湖连接，导致水位大幅度变化，最终导致武昌湖挺水植物菰疯长。为了设计一种控制Z膨胀的方法。利用遥感技术和地理信息系统（GIS）技术，分析了阔叶树Z.宽叶。结果表明，该属植物的分布范围为100 ~ 1000 m2/h，分布面积为1000 ~ 1000 m2/h。1981 ~ 2009年，阔叶树的平均生长速率为1.8 km 2/a。2009年，植物覆盖了整个湖泊的53%，湖泊呈现出严重的陆地化趋势。水文资料分析表明，植物萌发期（2 - 3月）水位的显著下降可能是导致泽漆过度生长的主要原因。宽叶。通过对建闸前2 ~ 3月平均水位和该植物萌发阈值的评估，建议将2 ~ 3月平均水位由目前的11.0m提高到12.0m，以减少Z.阔叶树由目前的56.8%上升到8.9%。本研究结果可为类似水位调控湖泊水生植物的控制提供参考。
Wuchang Lake is a shallow lake located in the middle reaches of the Yangtze River. Historically, it was freely connected with the Yangtze mainstem and dominated by submerged macrophytes. For fishing and flood control, the river–lake connection was blocked by the Wanhe sluice in 1959; this led to large changes in water level and ultimately the overgrowth of the emergent macrophyteZizania latifoliain Wuchang Lake. In order to devise a way to control the expansion ofZ. latifolia, remote sensing and a geographic information system (GIS) were used in this study to analyze the changes in distribution ofZ. latifolia. The results showed that the distribution area ofZ. latifolialinearly increased from 1981 to 2009, and the annual average growth rate was about 1.8 km2/year. In 2009, the plant covered about 53% of the whole lake, and the lake was presenting a serious tendency for terrestrialization. Analyses of the hydrological data indicated that the significantly decreased water level during the plant's germination period (February–March) may be the main cause for the overgrowth ofZ. latifolia. By assessing the February–March mean water level before the building of sluice, and the plant's germination threshold for water depth, we recommend increasing the February–March mean water levels from 11.0 m at present to 12.0 m; this would reduce the potential distribution area ofZ. latifoliafrom 56.8% at present to 8.9%. The results of this study should be useful for the control of aquatic macrophytes in other lakes subject to similar water level regulations.