An exploratory analysis of ecological water requirements of macroinvertebrates in the Wuhan branch of the Yangtze River

Pan, Baozhu; Wang, Hongzhu; Ban, Xuan; Yin, Xia

doi:10.1016/j.quaint.2014.10.011

Cited by 26 publications

(14 citation statements)

References 23 publications

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“…Its drainage area accounts for 18.8% of the land area in China [15][16][17]. The upper reach of the Yangtze River is defined from the source of the Yangtze River to the Three Gorges Dam (the largest dam in the world) and with a length of 4504 km and a drainage area of 10 6 km 2 [18].…”

Section: Introductionmentioning

confidence: 99%

Influence Mechanisms of Rainfall and Terrain Characteristics on Total Nitrogen Losses from Regosol

Ding

Xue

et al. 2017

Water

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Abstract:The upper reach of the Yangtze River is an ecologically sensitive region where water loss, soil erosion, and nonpoint source (NPS) pollution are serious issues. In this drainage area, regosol is the most widely distributed soil type. Cultivation on regosol is extensive and total nitrogen (TN) has become a common NPS pollutant. Artificial rainfall experiments were conducted to reveal the influence mechanisms of rainfall and terrain on TN losses from regosol. The results showed that there were positive correlations between precipitations and TN loads but negative ones between precipitations and TN concentrations. Furthermore, negative correlations were more obvious on fields with slopes of 5 • and 25 • than on other slopes. With increasing rainfall intensity, TN loads rose simultaneously. However, TN concentration in runoff-yielding time presented a decline over time. As far as terrain was concerned, TN loads grew generally but not limitlessly when slopes increased. Similarly, TN concentrations also rose with rising slopes; upward trends were more obvious for steeper slopes. Furthermore, the initial runoff-yielding time became longer for steeper slopes and the differences under various rainfall intensity conditions diminished gradually.

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Section: Introductionmentioning

confidence: 99%

Influence Mechanisms of Rainfall and Terrain Characteristics on Total Nitrogen Losses from Regosol

Ding

Xue

et al. 2017

Water

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“…The EWR, related with the level of health of an ecosystem, was a measurement tool for evaluating whether the ecological protection goals of complex ecosystems are achieved [29,30]. The studies about the EWRs of rivers in Virginia, America, which was calculated by the Tennant methods, show that 10% volume of runoff, namely the general minimal ecological water requirements, caused the ecosystem degradation [31].…”

Section: Assessment Methods For Impacts Of Ecological Security Of Ibwtpsmentioning

confidence: 99%

Impact of Inter‐Basin Water Transfer Projects on Regional Ecological Security from a Telecoupling Perspective

et al. 2016

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Abstract:Inter-basin water transfer projects (IBWTPs) offer one of the most important means to solve the mismatch between supply and demand of regional water resources. IBWTPs have impacts on the complex ecosystems of the areas from which water is diverted and to which water is received. These impacts increase damage or risk to regional ecological security and human wellbeing. However, current methods make it difficult to achieve comprehensive analysis of the impacts of whole ecosystems, because of the long distance between ecosystems and the inconsistency of impact events. In this study, a model was proposed for the analysis of the impacts of IBWTPs on regional ecological security. It is based on the telecoupling framework, and the Driver-Pressure-State-Impact-Response (DPSIR) model was used to improve the analysis procedure within the telecoupling framework. The Middle Line of the South-to-North Water Diversion Project was selected as a case study to illustrate the specific analysis procedure. We realized that information sharing is a key issue in the management of regional security, and that the ecological water requirement, in the form of a single index, could be used to quantitatively assess the impacts on ecological security from IBWTPs.

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“…The Yangtze River is the longest river in China with abundant natural resources, such as hydro-power resources, biological resources and mineral resources, and agricultural production in Yangtze River basin plays an important role in China [12,13]. Meanwhile, Sichuan Basin is an important agricultural and ecological region of the upper reaches of Yangtze River [14].…”

Section: Introductionmentioning

confidence: 99%

Effects of Precipitation and Topography on Total Phosphorus Loss from Purple Soil

Ding

Xue

et al. 2017

Water

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Abstract:The Sichuan Basin is the main agricultural production area of the upper reaches of the Yangtze River and is also an extremely important ecological area because it is rich in biodiversity and has complex and diverse landscape types. The dominant soil type, purple soil, is prone to rapid soil erosion and weathering processes because it is shallow and rich in phosphorus and other nutrients. Field experiments were conducted to reveal the effects of precipitation and topography characteristics on nonpoint source pollutants from purple soil. The results showed that total phosphorus (TP) load and TP concentration both increased with increasing rainfall amount, and there was an initial time of runoff and sediment yield before runoff generation. Moreover, the TP load generally increased with precipitation intensity as setting a coincident value of rainfall amount; however, the difference between TP load at 30 and 60 mm/h was minimal as was the difference between 90 and 120 mm/h. Similarly, TP concentration increased with increasing precipitation intensity. In terms of topographical conditions, TP load increased with increasing gradient, but began to decline when the gradient was about 20 • , which indicates that 20 • is the critical gradient for TP loss. There was a significant positive correlation between gradient and TP concentration when the gradient was <15 • , whereas the increase in TP concentration slowed as the gradient increased.

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An exploratory analysis of ecological water requirements of macroinvertebrates in the Wuhan branch of the Yangtze River

Cited by 26 publications

References 23 publications

Influence Mechanisms of Rainfall and Terrain Characteristics on Total Nitrogen Losses from Regosol

Influence Mechanisms of Rainfall and Terrain Characteristics on Total Nitrogen Losses from Regosol

Impact of Inter‐Basin Water Transfer Projects on Regional Ecological Security from a Telecoupling Perspective

Effects of Precipitation and Topography on Total Phosphorus Loss from Purple Soil

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