Effects of macrophyte harvesting on the water quality and bottom environment of Lake Biwa, Japan

Kohzu, Ayato; Shimotori, Koichi; Imai, Akio

doi:10.1007/s10201-018-0556-0

Cited by 12 publications

(3 citation statements)

References 12 publications

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“…To address the water pollution problems brought about by the industrial revolution, many Western countries tried to restore the water environment. The United Kingdom, Japan and other industrial countries set up special research institutions to manage the water issues in the river basin, and their restoration process has even lasted for more than a century [4]. Compared to the above-mentioned countries with systematic theories and comprehensive practices in water environment governance, Chinese cities have started the research and practice in the relevant fields relatively late.…”

Section: Introductionmentioning

confidence: 99%

Performance Evaluation of Watershed Environment Governance—A Case Study of Taihu Basin

Huang

Hua

Dai

2022

Water

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The rapid development of urbanization and industrialization brings a series of problems of environment governance, and several basins are facing huge pressure. This paper selects the Taihu basin in the Yangtze River Delta of China as the study area, establishes the DPSIR model to measure the water environment governance performance of the region (), analyzes the causes of changes in the five subsystems (the governance performance of the subsystems is recorded as ), and uses the diagnostic model to identify the barrier factors that restrict the improvement of in the last 5 years. The results show that during the study period， of the driving force subsystem generally tends to increase and maintains a steady growth, which is closely linked to economic growth in the basin; of the pressure subsystem increases with a small fluctuation, and the pollution generation still needs attention; in the state subsystem, shows a large fluctuation, and varies significantly in a cyclical manner, corresponding to the short maintenance time and repeated treatment of pollution in the watershed; of the impact subsystem shows an overall upward but a slightly slower trend, and it is related to the fact that the industrial structure of the basin still needs to be improved; and of the response subsystem shows an overall upward trend and a slightly larger increase, and the multi-actor collaborative management has helped a lot. The main barrier factors include key cross-sections’ water quality compliance rate, the water quality compliance rate of key water function areas, water consumption per 10,000 yuan of industrial added value, and the lake trophic status index. Based on the results of the study, the article gives recommendations for watershed governance, such as controlling pollution generation, optimising industrial structure, using technological tools to help governance, sharing the cost of governance among multiple parties and strengthening supervision The findings help to make scientific environmental protection planning and policies of the study region. The research can also provide experience for other countries and regions in watershed governance.

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Section: Introductionmentioning

confidence: 99%

Performance Evaluation of Watershed Environment Governance—A Case Study of Taihu Basin

Huang

Hua

Dai

2022

Water

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“…Previous studies have also indicated that despite the negative short-term effects in the early decomposition period, a small amount of residue could improve or could have no impact on water quality (Li et al 2014;Pan et al 2017). Although, harvesting has been proven to be an effective way to diminish the negative influences of wetland plants, but identifying both the optimum mass of the residue and the possible effects on water quality in the long-term need to be further confirmed (Xu et al 2014;Wang et al 2015;Kohzu et al 2019). Developing a practical harvest plan at the management level also is far from being established.…”

Section: Introductionmentioning

confidence: 99%

The initial mass of residue can regulate the impact of Phragmites australis decomposition on water quality: a case study of a mesocosm experiment in a wetland of North China

Chen

Xia

et al. 2021

Journal of Freshwater Ecology

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Plant residue decomposition can significantly affect the water environment of wetland ecosystems. However, little is known about the trajectory and the key drivers of the different initial mass of residue (IMR) that regulate water quality. Here, we conducted a study of 210 days with an in situ experiment to examine the impact of the change in IMR and the key decomposition parameters of Phragmites australis on the water quality in the growing season of 2019 in Baiyangdian wetland in North China. Five IMR of the Phragmites were applied, ranging from 0 to 1000 g with 250 g increments. The chemical oxygen demand (COD_W), total organic carbon (TOC_W), total nitrogen (TN_W) and total phosphorus (TP_W) of the water, and the total organic carbon (TOC), total nitrogen (TN), total phosphorus (TP), cellulose, lignin, decomposition rate (k) and the remaining mass of the Phragmites in the bag (RM) were monitored. Our results showed that the IMR of the Phragmites only marginally influenced the decomposition of itself and; the variations in the level of the water indicators were ranked as TN > TP > COD > TOC and; the impacts of IMR were longer on TOC and COD than on TP and TN and; the change in water quality was significantly influenced by the Phragmites decomposition and highly correlated with the change in TOC, cellulose and k of decomposing Phragmites residue. These results indicated that the impact of 250 g of IMR on the water was negligible after 120 days, suggesting that the optimal harvest rate of the Phragmites should be above 75% in the Baiyangdian wetland, despite the strong impact at the beginning and; the impact of change in IMR on water quality can be explained by the change in the decomposition parameters of the ARTICLE HISTORY

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“…Ishikawa et al (2018) proposed the optimal ranges of PVI (% volume infestation) of the submerged plants for ecosystem management based on the relationship with DO and taxa richness of epi-fauna, epishellfish and periphyton. Kohzu et al (2018) examined the pore water quality of the surface sediment as indicator of the effects of macrophyte harvesting on water quality and compared different harvesting methods such as cutting away and pulling up by root. Ban et al (2018) reviewed a recycling system with anaerobic digestion of submerged macrophytes for effective utilization and sustainable management of macrophytes.…”

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confidence: 99%

Ecological and limnological bases for management of overgrown macrophytes: introduction to a special feature

2018

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Effects of macrophyte harvesting on the water quality and bottom environment of Lake Biwa, Japan

Cited by 12 publications

References 12 publications

Performance Evaluation of Watershed Environment Governance—A Case Study of Taihu Basin

Performance Evaluation of Watershed Environment Governance—A Case Study of Taihu Basin

The initial mass of residue can regulate the impact of Phragmites australis decomposition on water quality: a case study of a mesocosm experiment in a wetland of North China

Ecological and limnological bases for management of overgrown macrophytes: introduction to a special feature

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