scholarly journals Study on Hydrologic Effects of Land Use Change Using a Distributed Hydrologic Model in the Dynamic Land Use Mode

Water ◽  
2021 ◽  
Vol 13 (4) ◽  
pp. 447
Author(s):  
Qingyan Sun ◽  
Chuiyu Lu ◽  
Hui Guo ◽  
Lingjia Yan ◽  
Xin He ◽  
...  
Keyword(s):  
Land Use ◽  
Land Use Change ◽  
Hydrologic Model ◽  
Sanjiang Plain ◽  
Hydrologic Cycle ◽  
Dynamic Mode ◽  
The Sanjiang Plain ◽  
Distributed Hydrologic Model ◽  
Cycle Simulation ◽  
Effects Of Land Use

It is reasonable to simulate the hydrologic cycle in regions with drastic land use change using a distributed hydrologic model in the dynamic land use mode (dynamic mode). A new dynamic mode is introduced into an object-oriented modularized model for basin-scale water cycle simulation (MODCYCLE), a distributed hydrologic model based on sub-watersheds, and the hydrological response unit (HRU). The new mode can linearly interpolate data for the years without land use data and consistently transfer HRU water storage between two adjacent years after a land use data update. The hydrologic cycle simulation of the Sanjiang Plain in China was carried out from 2000 to 2014 in the dynamic mode using land use maps of 2000, 2005, 2010, and 2014. Through calibration and validation, the performance of the model reached a satisfactory level. Replacing the land use data of the calibrated model using that of the year 2000, a comparison model in the static land use mode (static mode) was built (i.e., land use unchanged since 2000). The hydrologic effects of land use change were analyzed using the two models. If the land use pattern remained unchanged from 2000, despite the average annual runoff increasing by 4% and the average annual evapotranspiration decreasing by 4% in this region only, the groundwater storage of the plain areas in 2014 would increase by 4.6 bil. m3 compared to that in 2000, rather than the actual decrease of 4.7 bil. m3. The results show that the fluxes associated with groundwater are obviously more disturbed by land use change in the Sanjiang Plain. This study suggests that the dynamic mode should be used to simulate the hydrologic cycle in regions with drastic land use change, and the consistent transfer of HRU water storage may be considered in the dynamic mode.

scholarly journals Effects of Urbanization on Watershed Evapotranspiration and Its Components in Southern China

Water ◽  
2020 ◽  
Vol 12 (3) ◽  
pp. 645 ◽  
Author(s):  
Qingzhou Zheng ◽  
Lu Hao ◽  
Xiaolin Huang ◽  
Lei Sun ◽  
Ge Sun
Keyword(s):  
Land Use ◽  
Land Use Change ◽  
Land Surface ◽  
Southern China ◽  
Hydrologic Model ◽  
Water Evaporation ◽  
Water Yield ◽  
Positive Trend ◽  
Significant Downward Trend ◽  
Effects Of Land Use

Understanding the effects of land use change on evapotranspiration (ET) and its partitioning to transpiration and evaporation is important for accurately evaluating the likely environmental impacts on watershed water supply, climate moderation, and other ecosystem services (e.g., carbon sequestration and biodiversity). This study used a distributed hydrologic model, MIKE SHE, to partition evapotranspiration into soil evaporation, transpiration, ponded water evaporation, and interception, and examined how the ET partitions affected the water balance in the Qinhuai River Basin from 2000 to 2013. Simulated daily ET was compared to measurements at an eddy flux research site during 2016–2017 (R2 = 0.72). Degradation in rice-wheat rotation fields and expansion of impervious surfaces impacted not only total watershed evapotranspiration, which showed a significant downward trend (p < 0.05), but also its partitioning. A significant (p < 0.01) decrease in transpiration was detected. Ponded water evaporation was the only ET partition that exhibited a significant positive trend (p < 0.05). We concluded that the reduced transpiration as a result of land use and land cover change was the primary factor driving the variation of watershed scale evapotranspiration. In addition, there was an increase in annual water yield (23%) as a response to significant reduction in ET (7%) due to a 175% expansion of urban area in the study watershed. Our study provided insights to the mechanisms of land surface–water cycle interaction and better understanding of the effects of land use change on urban micro-climate such as “urban dry island” and “urban heat island” effects.

scholarly journals Land use change effects on diversity of soil bacterial, Acidobacterial and fungal communities in wetlands of the Sanjiang Plain, northeastern China

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Xin Sui ◽  
Rongtao Zhang ◽  
Beat Frey ◽  
Libin Yang ◽  
Mai-He Li ◽  
...  
Keyword(s):  
Land Use ◽  
Microbial Community ◽  
Land Use Change ◽  
Arable Land ◽  
Sanjiang Plain ◽  
Fungal Communities ◽  
Wetland Soils ◽  
The Sanjiang Plain ◽  
Soil Microbial ◽  
Soil Bacterial

AbstractThe bacterial, acidobacterial, and fungal communities in wetlands can undergo perturbations by various human activities, such as disturbances caused by cultivation and during the process of system restoration. In this study, we investigated the relationships between the composition of the soil bacterial, acidobacterial, and fungal communities and the transformation of wetlands by human activities in the Sanjiang Plain. Soil microbial communities were assessed in wetland soils collected from pristine marsh, neighboring cropland (wetland turned into arable land), and land that had been reforested with Larix gmelinii. The alpha-diversities of bacteria, Acidobacteria, and fungi were affected by land-use change and were highest in the arable land and lowest in the wetland soils. The soil microbial community structures were also altered with changing land-use. Canonical correlation analyses showed that beta-diversity was significantly affected by soil pH, available phosphorus, soil nitrogen, and total organic carbon. Overall, our results showed that the agricultural cultivation of wetlands changes the available soil carbon, nitrogen, and phosphorus pools, thereby influencing the bacterial, acidobacterial, and fungal diversity and community structure. Once the soil microbial community has been altered by human activity, it might be difficult to restore it to its original state. These findings highlight the importance of effectively maintaining the diversity of soil bacterial, Acidobacterial, and fungal communities despite land use change in order to sustain a microbial community diversity and ecosystem function.

Modelling the hydrologic effects of dynamic land-use change using a distributed hydrologic model and a spatial land-use allocation model

2010 ◽  
Vol 24 (18) ◽  
pp. 2538-2554 ◽  
Author(s):  
Hone-Jay Chu ◽  
Yu-Pin Lin ◽  
Chun-Wei Huang ◽  
Cheng-Yu Hsu ◽  
Horng-Yng Chen
Keyword(s):  
Land Use ◽  
Land Use Change ◽  
Hydrologic Model ◽  
Allocation Model ◽  
Distributed Hydrologic Model ◽  
Land Use Allocation

The influence of land-use change on the forms of phosphorus in soil profiles from the Sanjiang Plain of China

Geoderma ◽  
2012 ◽  
Vol 189-190 ◽  
pp. 207-214 ◽  
Author(s):  
Wenjing Yang ◽  
Hongguang Cheng ◽  
Fanghua Hao ◽  
Wei Ouyang ◽  
Shaoqing Liu ◽  
...  
Keyword(s):  
Land Use ◽  
Land Use Change ◽  
Sanjiang Plain ◽  
Soil Profiles ◽  
The Sanjiang Plain
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