scholarly journals Functional Responses of Phytoplankton Assemblages to Watershed Land Use and Environmental Gradients

2022 ◽  
Vol 9 ◽  
Author(s):  
Xue Du ◽  
Dan Song ◽  
Kun Ming ◽  
Jingshuang Yang ◽  
Xing Jin ◽  
...  
Keyword(s):  
Land Use ◽  
Environmental Gradients ◽  
Urban Land Use ◽  
Superior Performance ◽  
Biological Traits ◽  
Land Use Intensity ◽  
Functional Responses ◽  
Phytoplankton Assemblages ◽  
Watershed Land Use ◽  
Phytoplankton Communities

Watershed land-use changes have been identified as major threats to lake fauna, subsequently affecting ecosystem functioning. In this study, the functional-based approach was used to examine the effects of land use and environmental changes on phytoplankton communities in four selected lakes in Northeast China. We also identified the sensitive functional traits as indicators of environmental stressors. The integration of RLQ analysis with the fourth-corner approach significantly identified five of 18 functional trait categories, including flagella, filamentous, unicellular, mixotrophic, and chlorophyll c, as potential indicators to changes in watershed land-use intensity and environmental gradients. Significant relationships between traits and land use and water quality highlighted the consequential indirect impact of extensive agricultural and urban development on phytoplankton via allochthonous nutrient inputs and various contaminants. In addition, the functional richness of phytoplankton assemblages generally increased along with surface area and forests, but decreased along with intensive agricultural and urban land use, implying that functional homogenization may cause a reduction in ecosystem productivity and reliability to land-use intensity. Given the superior performance of the functional-based approach, our findings also highlighted the importance of the application of both the biological traits and functional diversity index in monitoring programs for lake ecosystems.

Urban land use intensity assessment: The potential of spatio-temporal spectral traits with remote sensing

2018 ◽  
Vol 85 ◽  
pp. 190-203 ◽  
Author(s):  
Thilo Wellmann ◽  
Dagmar Haase ◽  
Sonja Knapp ◽  
Christoph Salbach ◽  
Peter Selsam ◽  
...  
Keyword(s):  
Remote Sensing ◽  
Land Use ◽  
Urban Land ◽  
Urban Land Use ◽  
Land Use Intensity ◽  
Intensity Assessment ◽  
Spatio Temporal

Impact of the top-down quota-oriented farmland preservation planning on the change of urban land-use intensity in China

2018 ◽  
Vol 77 ◽  
pp. 71-79 ◽  
Author(s):  
Taiyang Zhong ◽  
Zhu Qian ◽  
Xianjin Huang ◽  
Yuntai Zhao ◽  
Yan Zhou ◽  
...  
Keyword(s):  
Land Use ◽  
Urban Land ◽  
Urban Land Use ◽  
Land Use Intensity ◽  
Farmland Preservation ◽  
Top Down ◽  
Preservation Planning

scholarly journals Lichen Responses to Disturbance: Clues for Biomonitoring Land-use Effects on Riparian Andean Ecosystems

Diversity ◽  
2019 ◽  
Vol 11 (5) ◽  
pp. 73 ◽  
Author(s):  
Leiddy Chuquimarca ◽  
Fernando P. Gaona ◽  
Carlos Iñiguez-Armijos ◽  
Ángel Benítez
Keyword(s):  
Land Use ◽  
Species Richness ◽  
Community Composition ◽  
Functional Traits ◽  
Environmental Changes ◽  
Land Use Changes ◽  
Urban Land Use ◽  
Land Use Intensity ◽  
Riparian Ecosystems ◽  
Natural Ecosystems

The transformation of natural ecosystems due to anthropogenic land use is considered one of the main causes of biodiversity loss. Lichens, due to their poikilohydric nature, are very sensitive to natural and anthropogenic disturbances. Therefore, lichen communities have been widely used as bioindicators of climatic and environmental changes. In this study, we evaluated how the species richness and community composition of epiphytic lichens respond to land-use intensity in riparian ecosystems of the Andes in southern Ecuador. Additionally, we evaluate how the richness of six functional traits (photobiont type, growth form, and reproductive strategy) changed across the different land-use intensity. We selected 10 trees in twelve sites for a total de 120 trees, equally divided into four riparian land-use intensities (forest, forest-pasture, pasture and urban). We recorded a total of 140 lichen species. Species richness was highest in the forest sites and decreased towards more anthropogenic land uses. Lichen community composition responded to land-use intensity, and was explained by microclimate variables (e.g., precipitation, percentage forested area) and distance to the forest. Richness of functional traits of lichens also differed significantly among the four land-use intensity and decreased from forests to urban land-use. Taxonomic diversity and functional traits can be effectively applied as bioindicators to assess and monitor the effects of land-use changes in the riparian ecosystems of tropical montane regions.

scholarly journals How to Measure Urban Land Use Intensity? A Perspective of Multi-Objective Decision in Wuhan Urban Agglomeration, China

2018 ◽  
Vol 10 (11) ◽  
pp. 3874 ◽  
Author(s):  
Jun Yang ◽  
Gui Jin ◽  
Xianjin Huang ◽  
Kun Chen ◽  
Hao Meng
Keyword(s):  
Land Use ◽  
Urban Land ◽  
Urban Land Use ◽  
Urban Agglomeration ◽  
Land Use Intensity ◽  
Development Zone ◽  
Multi Objective ◽  
Intensive Use ◽  
Optimal Intensity ◽  
Wuhan Urban Agglomeration

Urban land intensive use is an important part of regional planning and plays an important role in the sustainable development of cities. However, the research on how to measure urban land use intensity is still controversial. This paper gives a perspective of multi-objective decision to explore the criterion of urban land use intensity in the process of urbanization. The theory of factor substitution was applied to analyze the mechanism of urban land intensive use in different urbanization stage. Additionally, the matching degree model (MDM), curve estimation model, and multi-objective programming model were employed in the case study of Wuhan urban agglomeration to give a multi-objective decision on urban land intensive use. The results show that the level of urban land intensive use lagging behind the level of urbanization development in more than 60% of the counties. When the level of urbanization is less than 30%, 30–70% and greater than 70%, the optimal intensity of urban land use characterized by fixed investments of unit land is 2.6252, 4.6132, and 6.7648 million RMB respectively. Based on optimal intensity, the counties in Wuhan urban agglomeration were divided into key development zone and optimized development zone. Finally, different management strategies were designed for different zones for urban land intensive use.

Applying AHP and Maximal Value Normalization to Evaluate Intensity of Urban Land Use in Sujiatun District, Shenyang City

2013 ◽  
Vol 709 ◽  
pp. 911-914
Author(s):  
Xiao Fan Zhao
Keyword(s):  
Land Use ◽  
Urban Land ◽  
Urban Land Use ◽  
Land Use Intensity ◽  
Shenyang City ◽  
Land Use Efficiency ◽  
Intensive Use ◽  
Use Efficiency

In order to explore the intensive extent of urban land use in Sujiatun District of Shenyang City, the AHP and maximal value normalization were taken to analyze the level of intensive use of urban land. Results indicated that land use is extensive and land functions are mixed in the study area. Land use intensity should be strengthened and more land should be reserved for construction so as to improve the land use efficiency.

scholarly journals Coordinated Development of Urban Land Use and Ecological Economics in China

2021 ◽  
Vol 2021 ◽  
pp. 1-8
Author(s):  
Zhiyuan Zhu ◽  
Gang Du
Keyword(s):  
Land Use ◽  
Regional Differences ◽  
Urban Land ◽  
Urban Land Use ◽  
Land Use Intensity ◽  
Upward Trend ◽  
Land Use Patterns ◽  
Coordinated Development ◽  
Use Patterns ◽  
Ecological Improvement

To analyze the coordination between land use and the ecological economy in China, ecoefficiency and land use intensity were measured using the nonradial, nonoriented slacks-based measure (SBM) and the vertical and horizontal scatter degree method. The TOPSIS method was then used to comprehensively evaluate regional differences in coordination. Our research indicates that the level of coordinated development between intensive urban land use and the ecological economy in China showed an overall upward trend from 2006 to 2017. The level of coordination was high in Beijing, Shanghai, and Tianjin and was low in Gansu, Ningxia, and Xinjiang. Changes in ecoefficiency were not consistent with the degree of coordination, and intensive urban land use was positively correlated with the level of coordination, which showed a mutually reinforcing relationship. Improving ecoefficiency is necessary for intensive urban land use, and for ecological improvement, coordinated development between ecoefficiency and urban land use intensity is essential. The establishment of environmentally friendly land use patterns could promote urban land use.

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