Climate Change and Anthropogenic Impacts on Wetland and Agriculture in the Songnen and Sanjiang Plain, Northeast China

Chen, Hao; Zhang, Wanchang; Gao, Huiran; Nie, Ning

doi:10.3390/rs10030356

Cited by 99 publications

(58 citation statements)

References 71 publications

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“…From one side, the edaphic aspect of lands (nutrients contents), the use of fertilizer can substantially increase yields. From the other side, unpredictable climate features such as droughts can have drastic impacts on food security regardless of the arable land availability [27]. Meanwhile, the sustainability of irrigated agriculture is also challenged by the rising water demand from urbanization and ecological civilization construction and water pollution [28].…”

Section: Discussionmentioning

confidence: 99%

Can Arable Land Alone Ensure Food Security? The Concept of Arable Land Equivalent Unit and Its Implications in Zhoushan City, China

Tan

et al. 2018

Sustainability

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Abstract:The requisition-compensation balance of farmlands (RCBF) is a strict Chinese policy that aims to ensure food security. However, the process of supplementing arable land has substantially damaged the ecological environment through the blind development of grasslands, woodlands, and wetlands to supplement arable land. Can arable land alone ensure food security? To answer this question, this study introduced the concepts of arable land equivalent unit (ALEU) and food equivalent unit (FEU) based on the idea of food security. Zhoushan City in Zhejiang Province, China was selected as the research area. This study analyzed the ALEU supply and demand capabilities in the study area and presented the corresponding policy implications for the RCBF improvement. The results showed that the proportion of ALEU from arable land and waters for aquaculture is from 46:54 in 2009 to 31:69 in 2015, thereby suggesting that aquaculture waters can also be important in food security. Under three different living standards (i.e., adequate food and clothing, well-off, and affluence), ALEU from arable land can barely meet the needs of the permanent resident population in the study area. However, ALEU from aquaculture waters can provide important supplementation. Therefore, we suggest that food supply capability from land types other than the arable land be taken seriously. Furthermore, RCBF can be improved with ALEU as core of the balance.

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Section: Discussionmentioning

confidence: 99%

Can Arable Land Alone Ensure Food Security? The Concept of Arable Land Equivalent Unit and Its Implications in Zhoushan City, China

Tan

et al. 2018

Sustainability

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“…Previous studies realized the impact of each dynamic, but studied them almost separately [3,27,28,59,66]. There is a limitation to the insights obtainable regarding the intersection of urban and wetland dynamics.…”

Section: Discussionmentioning

confidence: 99%

“…Time series of the natural wetlands and Tonghu detected the influence of the original surface hydraulic linkages and geomorphology characteristics on the wetland distribution [23], which were identified by the historical change detection module of the TVWSUE methodology. Unlike the static models of previous studies, which assumed a constant influence of human activity [26][27][28][29], our time-varying regression model dynamically simulated wetland loss under the impact of urban expansion. Thus, the TVWSUE performed much better in its forecasting ability of wetland loss, showing good spatial consistency between simulated wetland probabilities and actual wetland loss ( Figure 6 and Table 6).…”

Section: Discussionmentioning

confidence: 99%

Modeling Intersecting Processes of Wetland Shrinkage and Urban Expansion by a Time-Varying Methodology

Yi-meng

2019

Sustainability

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Continuous urban expansion worldwide has resulted in significant wetland degradation and loss. A limited number of studies have addressed the coupling of wetland and urban dynamics, but this relationship remains unclear. In this study, a time-varying methodology of predicting wetland distribution was developed to support decision-making. The novelty of the methodology is its ability to dynamically simulate wetland shrinkage together with urban expansion and reveal conflicts and potential tradeoffs under different scenarios. The developed methodology consists of three modules: a historical change detection of wetland and urban areas module, a spatial urban sprawl simulation and forecasting module that can accommodate different development priorities, and a wetland distribution module with time-varying logistic regression. The methodology was applied and tested in the Tonghu Wetland as a case study. The wetland and urban extents presented a spatially intersecting shift, where wetlands lost more than 40% of their area from 1977 to 2017, while urban areas expanded by 10-fold, threatening wetlands. The increase in the relative importance metric of the time-varying regression model indicated an enhanced influence of urban expansion on the wetland. An accuracy assessment validated a robust statistical result and a good visual fit between spatially distributed wetland occurrence probabilities and the actual distribution of wetland. Incorporating the new variable of urban expansion improved modeling performance and, particularly, realized a greater ability to predict potential wetland loss than provided by the traditional method. Future wetland loss probabilities were visualized under different scenarios. The historical trend scenario predicted continuously expanding urban growth and wetland shrinkage to 2030. However, a specific urban development strategy scenario was designed interactively to control the potential wetland loss. Consideration of such scenarios can facilitate identifying tradeoffs to support wetland conservation.

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“…It is also known as one of the world's three major black soil regions and soda salinized land areas. e altitude ranges from 101 to 1632 meters above sea level but is mostly below 200 meters [23]. e main landform types include those of low mountains, alluvial plains, tablelands, and intervals.…”

Section: Study Areamentioning

confidence: 99%

The Variations of Satellite-Based Ecosystem Water Use and Carbon Use Efficiency and Their Linkages with Climate and Human Drivers in the Songnen Plain, China

Huang

Chang

et al. 2019

Advances in Meteorology

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Ecosystem water use efficiency (WUE) and carbon use efficiency (CUE), as two of the most important ecological indicators of an ecosystem, represent the carbon assimilation rate of unit water consumption and the capacity of transferring carbon from the atmosphere to potential carbon sinks. Revealing WUE and CUE changes and their impact factors is vital for regional carbon-water interactions and carbon budget assessment. Climate affects carbon and water processes differently. Compared to WUE, the variations in CUE in response to climate factors and human activity remain inadequately understood. In this study, ecosystemlevel WUE and CUE variations in the Songnen Plain (SNP), Northeast China, during 2001-2015, were investigated using Moderate Resolution Imaging Spectroradiometer (MODIS) satellite data. e relationships between WUE, CUE, main climate factors, and human impacts were explored. e results showed that ecosystem WUE and CUE have fluctuated over time, with regional average values of 1.319 gC·kg −1 H 2 O and 0.516, respectively. Deciduous broad-leaved forests had the highest average WUE but the lowest CUE. e multiyear average CUE of grassland ranked in first place, while the lowest WUE indicated that a lesser capacity of net productivity was generated by the use of limited water supply. WUE and CUE showed a downward trend in most areas of the SNP, indicating that the carbon sequestration capacity of the terrestrial ecosystem became weaker in the past 15 years. Annual precipitation and relative humidity had positive influences on WUE and CUE in more than 60% of the study area. e total annual sunshine duration and annual average temperature negatively affected WUE and CUE in most areas. Human activities had a positive effect on ecosystem WUE changes in the SNP but might inhibit CUE variations. Our findings aid in understanding the biological regulation mechanisms of carbon-water cycle coupling and provide a scientific basis for formulating sustainable regional development strategies and guiding water and land resources management.

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Climate Change and Anthropogenic Impacts on Wetland and Agriculture in the Songnen and Sanjiang Plain, Northeast China

Cited by 99 publications

References 71 publications

Can Arable Land Alone Ensure Food Security? The Concept of Arable Land Equivalent Unit and Its Implications in Zhoushan City, China

Can Arable Land Alone Ensure Food Security? The Concept of Arable Land Equivalent Unit and Its Implications in Zhoushan City, China

Modeling Intersecting Processes of Wetland Shrinkage and Urban Expansion by a Time-Varying Methodology

The Variations of Satellite-Based Ecosystem Water Use and Carbon Use Efficiency and Their Linkages with Climate and Human Drivers in the Songnen Plain, China

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