LAND USE AND STREAMWATER NITRATE-N DYNAMICS IN AN URBAN-RURAL FRINGE WATERSHED

Integrated development in urban and rural areas has led to a new form of urban–rural interdependence, which promotes rural territorial functional evolution and land use changes. Rural land use transition, showing the synchronous development between cities and villages, is an important window through which to observe integrated development in urban and rural areas. We focus on uncovering the association between rural land use transition and urban–rural integration development (URID), put forward a dynamic relationship assumption between rural land use transformation and URID stages based on the transmission mechanism of urban–rural linkages, and undertake empirical analysis using the panel regression model with the data of county-level administrative units in Shandong Province, China. The results show that rural land use transition has maintained a close association with URID, and that the changes in cultivated land, forest land, and surface-water area are highly related to URID. There are different leading urban–rural linkages in rural areas around big-sized cities, mid-sized cities, and small-sized cities, which determine whether rural areas are in different URID stages of high, medium, or low levels. Further, rural areas can take different actions to promote URID at different stages through strengthening or introducing urban–rural linkages driven by economies of scale and deepening urbanization. This provides a reference for developing countries to formulate rural land use policies on achieving the goal of URID.

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Phosphorus Accumulation in Soils Along an Urban–Rural Land Use Gradient in Hangzhou, Southeast China

Communications in Soil Science and Plant Analysis ◽

10.1081/css-120030360 ◽

2004 ◽

Vol 35 (5-6) ◽

pp. 819-833 ◽

Cited By ~ 17

Author(s):

M. K. Zhang

Keyword(s):

Land Use ◽

Rural Land ◽

Southeast China ◽

Rural Land Use ◽

Phosphorus Accumulation ◽

Urban Rural

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Decoupled Soil Labile Carbon and Nitrogen Dynamics Triggered by Urban Vegetation

10.21203/rs.3.rs-542253/v1 ◽

2021 ◽

Author(s):

Xiaolin Dou ◽

Meng Lu ◽

Liding Chen

Keyword(s):

Land Use ◽

Urban Forest ◽

Urban Ecosystems ◽

Isotopic Analysis ◽

C Sequestration ◽

Bare Soil ◽

N Dynamics ◽

Soil C ◽

Soil C And N ◽

C And N

Abstract Purpose Studies about soil carbon (C) and nitrogen (N) dynamics with land use change are urgently needed for urban ecosystems. We used fractionation of soils combined with stable isotopic analysis to examine soil C and N cycles after decadal forest and lawn planting in the Pearl River Delta, China. Methods Soil samples from bare soil (CK) and four land use treatments (55 and 20 years of forest plantation, F-55 and F-20; 55 and 20 years of lawn plantation, L-55 and L-20) were split into different chemical fractions. Then we analyzed the C and N contents, C/N ratio, δ13C and δ15N, C and N recalcitrant indices (RIC, RIN), and a C pool management index (CPMI).Results Forest vegetation substantially enhanced soil organic carbon (SOC) caused by the recalcitrant (RC) and labile C (LC) pools, while the larger soil organic nitrogen (SON) was ascribed to the increased recalcitrant N (RN). Enhanced LC but minor changes in labile N (LN) suggested a decoupled C and N in labile fractions of the forest soils. In contrast, the larger LN, and the enhanced decomposition of SOC, indicated that the lawns may have inhibited N mineralization of labile pools, also suggesting a decoupled C and N turnover and leading to low RIN values. Conclusions Urban forest and lawn plantations significantly changed the soil C and N dynamics, and emphasized the inconsistency between C and N processes, especially in labile pools, which would eventually lead to minor changes in N and limit the ecosystem C sequestration.

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