Land use and landscape position influence soil organic phosphorus speciation in a mixed land‐use watershed

Assessing transport CO2 emissions is important in the development of low-carbon strategies, but studies based on mixed land use are rare. This study assessed CO2 emissions from passenger transport in traffic analysis zones (TAZs) at the community level, based on a combination of the mixed-use development model and the vehicle emission calculation model. Based on mixed land use and transport accessibility, the mixed-use development model was adopted to estimate travel demand, including travel modes and distances. As a leading low-carbon city project of international cooperation in China, Shenzhen International Low-Carbon City Core Area was chosen as a case study. The results clearly illustrate travel demand and CO2 emissions of different travel modes between communities and show that car trips account for the vast majority of emissions in all types of travel modes in each community. Spatial emission differences are prominently associated with inadequately mixed land use layouts and unbalanced transport accessibility. The findings demonstrate the significance of the mixed land use and associated job-housing balance in reducing passenger CO2 emissions from passenger transport, especially in per capita emissions. Policy implications are given based on the results to facilitate sophisticated transport emission control at a finer spatial scale. This new framework can be used for assessing the impacts of urban planning on transport emissions to promote sustainable urbanization in developing countries.

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Relationship between Land Use Mix and Walking Choice in High-Density Cities: A Review of Walking in Seoul, South Korea

Sustainability ◽

10.3390/su13020810 ◽

2021 ◽

Vol 13 (2) ◽

pp. 810

Author(s):

Eun Yeong Seong ◽

Nam Hwi Lee ◽

Chang Gyu Choi

Keyword(s):

Land Use ◽

Neighborhood Environment ◽

Single Family ◽

Housing Type ◽

General Belief ◽

Factors Affecting ◽

Land Use Mix ◽

Family Housing ◽

Mixed Land Use ◽

Major Factors

This study confirmed the general belief of urban planners that mixed land use promotes walking in Seoul, a metropolis in East Asia, by analyzing the effect of mixed land use on the travel mode choice of housewives and unemployed people who make non-commuting trips on weekdays. Using binomial logistic regression of commuting data, it was found that the more mixed a neighborhood environment’s uses are, the more the pedestrians prefer to walk rather than drive. The nonlinear relationship between the land use mix index and the choice to walk was also confirmed. Although mixed land use in neighborhoods increased the probability of residents choosing walking over using cars, when the degree of complexity increased above a certain level, the opposite effect was observed. As the density of commercial areas increased, the probability of selecting walking increased. In addition to locational characteristics, income and housing type were also major factors affecting the choice to walk; i.e., when the residents’ neighborhood environment was controlled for higher income and living in an apartment rather than multi-family or single-family housing, they were more likely to choose driving over walking.

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Utilization of soil organic phosphorus as a strategic approach for sustainable agriculture

Journal of Plant Nutrition and Soil Science ◽

10.1002/jpln.202100057 ◽

2021 ◽

Author(s):

Saad Sulieman ◽

Karl H. Mühling

Keyword(s):

Sustainable Agriculture ◽

Organic Phosphorus ◽

Soil Organic Phosphorus ◽

Strategic Approach

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Fully distributed versus semi-distributed process simulation of a highly managed watershed with mixed land use and irrigation return flow

Environmental Modelling & Software ◽

10.1016/j.envsoft.2021.105000 ◽

2021 ◽

Vol 140 ◽

pp. 105000

Author(s):

Anoop Valiya Veettil ◽

Timothy R. Green ◽

Holm Kipka ◽

Mazdak Arabi ◽

Nathan Lighthart ◽

...

Keyword(s):

Land Use ◽

Process Simulation ◽

Return Flow ◽

Irrigation Return Flow ◽

Distributed Process ◽

Mixed Land Use

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MINERALIZATION OF SOIL ORGANIC PHOSPHORUS WITH PARTICULAR REFERENCE TO THE EFFECT OF LIME

Canadian Journal of Soil Science ◽

10.4141/cjss63-012 ◽

1963 ◽

Vol 43 (1) ◽

pp. 97-106 ◽

Cited By ~ 37

Author(s):

R. L. Halstead ◽

J. M. Lapensee ◽

K. C. Ivarson

Keyword(s):

Phosphorus Content ◽

Organic Phosphorus ◽

Acid Soils ◽

Inorganic Phosphorus ◽

Eastern Canada ◽

Surface Samples ◽

Soil Organic Phosphorus ◽

Repressive Effect ◽

Partial Sterilization ◽

Positive Effect

In a laboratory experiment, liming resulted in an average decline of 3.6 per cent in the total organic phosphorus content of incubated surface samples of seven acid soils from eastern Canada. Increases of 2.6 and 5.1 per cent in 1N H2SO4- and 4N HCl-soluble inorganic phosphorus, respectively, and a decrease of 46.4 per cent in NaHCO3-soluble organic phosphorus (pH 8.5) provided further evidence of mineralization of organic phosphorus following liming. There was some evidence, however, that the differences in NaHCO3-soluble organic phosphorus following liming were due only in part to mineralization, since Ca(OH)2 added to a soil just prior to extraction with NaHCO3 had a repressive effect on the solubility of the organic phosphorus compounds.Some mineralization of organic phosphorus occurred when unlimed samples were incubated in the laboratory for 9 months.Marked increases in microbiological activity, as indicated by increased numbers of microorganisms, and increased CO2 and NO3-nitrogen production, were associated with lower values for extractable organic phosphorus following liming. Partial sterilization of samples with toluene lowered biological activity in the unlimed and limed samples. Toluene was found, however, to have a positive effect on release of phosphorus from organic form.

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