The Impact of Cropland Balance Policy on Ecosystem Service of Water Purification—A Case Study of Wuhan, China

Yun, Mei; Kong, Xinghe; Ke, Xinli; Yang, Bohan

doi:10.3390/w9080620

Cited by 15 publications

(8 citation statements)

References 30 publications

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“…These areas provide the highest nitrogen and phosphorus load, but low maximum retention efficiency. This result is in agreement with [65], who applied the NDR model to calculate nutrient export under two different scenarios. They found that the cropland balance policy negatively impacted water purification by increasing nitrogen export, which was 8.36% higher than that in the no strict cropland protection scenario.…”

Section: Nutrient Export Estimation Of Predicted Lulc Under Scenario IIIsupporting

confidence: 92%

Suitable Land-Use and Land-Cover Allocation Scenarios to Minimize Sediment and Nutrient Loads into Kwan Phayao, Upper Ing Watershed, Thailand

Kulsoontornrat

Ongsomwang

2021

Applied Sciences

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Human activity and land-use changes have affected the water quality of Kwan Phayao, Upper Ing watershed, due to the associated high sediment load and eutrophication. This study aims to identify suitable LULC allocation scenarios for minimizing sediment and nutrient export into the lake. For this purpose, the LULC status and change were first assessed, based on classified LULC data in 2009 and 2019 from Landsat images, using the SVM algorithm. Later, the land requirements of three scenarios between 2020 and 2029 were estimated, based on their characteristics, and applied to predict LULC change using the CLUE-S model. Then, actual LULC data in 2019 and predicted LULC data under three scenarios between 2020 and 2029 were used to estimate sediment and nutrient export using the SDR and NDR models. Finally, the ecosystem service change index identified a suitable LULC allocation for minimizing sediment or/and nutrient export. According to the results, LULC status and change indicated perennial trees and orchards, para rubber, and rangeland increased, while forest land and paddy fields decreased. The land requirements of the three scenarios provided reasonable results, as expected, particularly Scenario II, which adopts linear programming to calculate the land requirements for maximizing ecosystem service values. For sediment and nutrient export estimation under the predicted LULC for the three scenarios, Scenario II led to the lowest yield of sediment and nutrient exports, and provided the lowest average ESCI value among the three scenarios. Thus, the LULC allocation under Scenario II was chosen as suitable for minimizing sediment or/and nutrient export into Kwan Phayao. These results can serve as crucial information to minimize sediment and nutrient loads for land-use planners, land managers, and decision makers.

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Section: Nutrient Export Estimation Of Predicted Lulc Under Scenario IIIsupporting

confidence: 92%

Suitable Land-Use and Land-Cover Allocation Scenarios to Minimize Sediment and Nutrient Loads into Kwan Phayao, Upper Ing Watershed, Thailand

Kulsoontornrat

Ongsomwang

2021

Applied Sciences

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“…Consequently, ecological lands (referring to land use types that provide valuable ecosystem services such as forests, grasslands and water bodies) are indirectly occupied by cropland reclamation. The impact of ecological land loss during cropland reclamation has been revealed in terms of ecosystem services such as food production [18], carbon storage [19], habitat quality [20], water yield [21] and water purification [22]. It has even been argued that the indirect impact on ecosystem services from ecological land loss due to cropland reclamation can be higher than that caused directly by urban expansion.…”

Section: Introductionmentioning

confidence: 99%

Impact of Cropland Reclamation on Ecological Security in the Yangtze River Economic Belt, China

Yin¹,

Zhou

2021

Sustainability

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Ecological security is important both for maintaining the function of an ecosystem and for providing ecosystem services to the human wellbeing. The impact of land use change/cover on ecological security has attracted considerable attention, whereas the role of cropland reclamation remains unclear. The indirect loss of ecological land that occurs upon the request of cropland requisition-compensation policies offer further changes to ecological security. In order to ascertain the impact of cropland reclamation on ecological security, in this study three scenarios are established, addressing cropland returning to ecological lands without a slope limitation, with a slope <25°, and with a reclaimed cropland slope ≥25°. This study was conducted in the Yangtze River economic belt (YREB) due to its important contribution to ecological security in China. Land uses in different scenarios in 2030 are projected using the land use simulation model LANDSCAPE. Accordingly, ecological security in each scenario was evaluated using the contribution–vigour–organization–resilience framework, comprising the variables carbon storage, water purification, water yield, habitat quality, net primary productivity, mean patch area, Shannon’s diversity index, largest patch index and contagion, as well as the normalized difference vegetation index. The results indicate that about 62% of YREB land is projected to remain stable in terms of ecological security, while about 21% will deteriorate and 17% will improve between 2015–2030. Land where ecological security is projected to improve is concentrated in areas where broad and connected croplands are distributed. The fact that a higher proportion of areas will deteriorate than improve suggests that the negative impact of cropland change on ecological security should not be ignored. Comparing different scenarios, croplands returning to ecological lands pose a particularly significant impact on ecological security, particularly in the upper reaches of the YREB, where steep croplands are concentrated.

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“…However, these policies require developers to reclaim farmland area occupied by built-up land elsewhere [ 30 ]. Therefore, compensation for the loss of farmland due to built-up land expansion can lead to additional ecological land losses (e.g., of forestland, bare land, and grassland), which in turn hinders economic development [ 12 ]. This result was also supported by the annual rate of change for various land use types ( Table 5 ) and the landscape transformation of Wuhan city between 1980 and 2020 ( Figure 2 ).…”

Section: Discussionmentioning

confidence: 99%

“…Landscape change driven by urbanization is a major contributor to changes in the spatio-temporal dynamics of ecosystems and is a major factor driving ecosystem service losses [ 12 , 13 ]. The ecosystem service value (ESV) is the value of goods and services provided by ecosystems for human well-being, and is the main indicator for assessing ecosystem change.…”

Section: Introductionmentioning

confidence: 99%

Landscape Evolution and It’s Impact of Ecosystem Service Value of the Wuhan City, China

Chen

Huang

2021

IJERPH

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Rapid urbanization and industrialization and enhanced ecological protection measures have greatly influenced landscape change, which has exacerbated regional landscape competition and conflicts and indirectly affected the supply of ecosystem services. Clarifying the relationship between ecosystem service change and landscape change is useful for understanding the impact of ecosystem conversion on socio-economic development and providing a knowledge base for relevant policy decisions. In this study, we used remote sensing technology to process Landsat TM/ETM+/OLI imageries, combined with transformation analysis and kernel density analysis to study the spatial and temporal characteristics of land use change in Wuhan City from 1980 to 2020. We also estimated the ESV in the region using the improved unit area value equivalent method to reveal the trends of ESV changes in Wuhan. The results showed that land use changes in Wuhan during 1980–2020 occurred mainly in terms of decreases in farmland, forestland, and bare land, as well as increases in built-up land and water bodies. The built-up land was mainly concentrated in the main urban areas, but its area in each suburban area has increased in recent years. In contrast, farmland was mainly distributed in suburban areas, and its area has been decreasing in recent years due to the impact of urban expansion. However, the reduction is compensated for by the reclamation of ecological land such as grassland and forestland, which has aggravated the loss of ecosystem service values in the study area. In addition, human activities such as urban expansion have increased the demand for water resources, while also leading to ecological problems such as water scarcity and water quality degradation, which have caused serious losses to key ecosystem services in Wuhan city. Therefore, in order to alleviate the competition and conflicts in the landscape and mitigate the loss of ecosystem service values in this area, we have proposed some constructive suggestions for future urban planning and water quality improvements in Wuhan. The focus of these suggestions is on controlling the expansion of built-up land, as well as the conservation of ecological land and resource protection. Meanwhile, our findings can also provide reference information for land resource planning and ecological monitoring, and help researchers to understand the contribution of ecosystem service functions in relation to socio-economic development.

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The Impact of Cropland Balance Policy on Ecosystem Service of Water Purification—A Case Study of Wuhan, China

Cited by 15 publications

References 30 publications

Suitable Land-Use and Land-Cover Allocation Scenarios to Minimize Sediment and Nutrient Loads into Kwan Phayao, Upper Ing Watershed, Thailand

Suitable Land-Use and Land-Cover Allocation Scenarios to Minimize Sediment and Nutrient Loads into Kwan Phayao, Upper Ing Watershed, Thailand

Impact of Cropland Reclamation on Ecological Security in the Yangtze River Economic Belt, China

Landscape Evolution and It’s Impact of Ecosystem Service Value of the Wuhan City, China

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