ANALYSIS OF EFFECT OF LAKE WATER LEVEL CHANGES ON EMERGENT PLANTS: A CASE STUDY IN THE HONGZE LAKE

QIN Jing-lan; YIN Xin-an; LIU Hong-rui; QIU Xin-tian; SHAO Ya-nan

doi:10.13205/j.hjgc.202010009

Volume 38 Issue 10

Nov. 2020

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QIN Jing-lan, YIN Xin-an, LIU Hong-rui, QIU Xin-tian, SHAO Ya-nan. ANALYSIS OF EFFECT OF LAKE WATER LEVEL CHANGES ON EMERGENT PLANTS: A CASE STUDY IN THE HONGZE LAKE[J]. ENVIRONMENTAL ENGINEERING , 2020, 38(10): 53-60. doi: 10.13205/j.hjgc.202010009

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QIN Jing-lan, YIN Xin-an, LIU Hong-rui, QIU Xin-tian, SHAO Ya-nan. ANALYSIS OF EFFECT OF LAKE WATER LEVEL CHANGES ON EMERGENT PLANTS: A CASE STUDY IN THE HONGZE LAKE[J]. ENVIRONMENTAL ENGINEERING , 2020, 38(10): 53-60. doi: 10.13205/j.hjgc.202010009

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ANALYSIS OF EFFECT OF LAKE WATER LEVEL CHANGES ON EMERGENT PLANTS: A CASE STUDY IN THE HONGZE LAKE

doi: 10.13205/j.hjgc.202010009

School of Environment, Beijing Normal University, Beijing 100875, China

Received Date: 2020-05-27

Abstract

Abstract

The amplitude, frequency, duration, and regularity of lake water level fluctuations are the key factors affecting the status of lake aquatic vegetation and the allocation of water resources. Previous studies mainly identified the main ecological impacts by selecting some water level change indicators. To maintain the ecological health of lakes and carry out reasonable water level control, it is necessary to integrate multiple indicators of water level changes and analyze the response characteristics of lake plants to lake water level changes as a whole. Taking the Hongze Lake as an example, based on the IHA/RVA method, this paper focused on the analysis of the influence of the Hongze Lake water level changes on emergent plants after the first phase of the East Route of the South-to-North Water Diversion Project. The results showed that after the first phase of the East Route of the South-to-North Water Diversion Project, the Hongze Lake’s monthly average water level in March, May, July and September and the minimum 30-day average water level changed in height, which had the most significant impact on the area of emergent plants. For the other IHA indicators, the degree of change was small and the impact was not obvious. When the average water level in March exceeded 13.4 m, the germination of emergent plants was significantly inhibited; when the average water level in May was 13.1 m and the average water level in July was 12.7 m, the area of emergent plants increased significantly; when the average water level in September was higher than 13.4 m, the area of emergent plants was greatly reduced; when the minimum 30-day average water level was less than 12.0 m, the area of emergent plants decreased by 14.32 km² on average. From the perspective of maintaining the area of emergent plants, and the reverse seasonal hydrological process of the Hongze Lake to meet the needs of the growth and reproduction of emergent plants, the suitable ecological water levels in March, May, July and September should be determined at 13.20 m, 13.10 m, 12.70 m and 12.85 m, respectively.
- lake,
- water level change,
- emergent plants,
- the Hongze Lake

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References(33)

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