INFLUENCES OF GROUNDWATER DEPTH ON WATER TRANSPORT AND DISSIPATION IN SPAC SYSTEM OF <i>PHRAGMITES AUSTRALIS</i> IN A SEMI-ARID WETLAND

ZHANG Yun-long; WANG Xuan; LIU Dan; LIAO Zhen-mei; LIU Qiang; LI Chun-hui; CAI Yan-peng

doi:10.13205/j.hjgc.202010002

Volume 38 Issue 10

Nov. 2020

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2020 > 38(10): 7-13

ZHANG Yun-long, WANG Xuan, LIU Dan, LIAO Zhen-mei, LIU Qiang, LI Chun-hui, CAI Yan-peng. INFLUENCES OF GROUNDWATER DEPTH ON WATER TRANSPORT AND DISSIPATION IN SPAC SYSTEM OF PHRAGMITES AUSTRALIS IN A SEMI-ARID WETLAND[J]. ENVIRONMENTAL ENGINEERING , 2020, 38(10): 7-13. doi: 10.13205/j.hjgc.202010002

Citation:

ZHANG Yun-long, WANG Xuan, LIU Dan, LIAO Zhen-mei, LIU Qiang, LI Chun-hui, CAI Yan-peng. INFLUENCES OF GROUNDWATER DEPTH ON WATER TRANSPORT AND DISSIPATION IN SPAC SYSTEM OF PHRAGMITES AUSTRALIS IN A SEMI-ARID WETLAND[J]. ENVIRONMENTAL ENGINEERING , 2020, 38(10): 7-13. doi: 10.13205/j.hjgc.202010002

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INFLUENCES OF GROUNDWATER DEPTH ON WATER TRANSPORT AND DISSIPATION IN SPAC SYSTEM OF PHRAGMITES AUSTRALIS IN A SEMI-ARID WETLAND

doi: 10.13205/j.hjgc.202010002

1. State Key Laboratory of Water Environment Simulation, Beijing Normal University, Beijing 100875, China;
2. Key Laboratory for Water and Sediment Sciences of Ministry of Education, Beijing Normal University, Beijing 100875, China

Received Date: 2020-05-15

Abstract

Abstract

It was an important premise for sustainable management of regional water resources to accurately grasp the law of water transport and dissipation in the soil-plant-atmosphere continuum (SPAC). In this paper, the Baiyangdian wetland was taken as the research area. Combined with field measurement and model simulation method, influences of groundwater depth change on the water transport and dissipation in the SPAC system of Phragmites australis were discussed. The main conclusions of this study was as follows:1) Evapotranspiration of Phragmites australis (ET_a) decreased with the increase of groundwater depth, and the threshold of groundwater depth for ET_a to decrease was about 100 cm. With the decrease of groundwater depth, the soil profile balance during the whole growing season changed from water deficit to surplus. The groundwater burial depth threshold value that soil profile balance changed from water deficit to surplus was 60 cm, and the deficit amount was positively related to groundwater burial depth. 2) The effect levels of groundwater depth change on soil water storage and evapotranspiration in different months were different, and they reached peak in June. A large amount of ecological water replenishment should be avoided in spring and before the flood season, and the recommended water replenishment timings was autumn and winter. 3) With a comprehensive consideration of vegetation growth demand and water conservation, the optimal groundwater depth range of Phragmites australis communities was 110~150 cm in Baiyangdian wetland. Under the optimal scenario, the evapotranspiration of Phragmites australis communities in the growing season had 10%~20% water-saving potential.
- groundwater depth,
- SPAC system,
- Phragmites australis,
- water transport,
- Baiyangdian wetland

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