scholarly journals Optimization of the National Land Space Based on the Coordination of Urban-Agricultural-Ecological Functions in the Karst Areas of Southwest China

2019 ◽  
Vol 11 (23) ◽  
pp. 6752 ◽  
Author(s):  
Xiaoqing Zhao ◽  
Sinan Li ◽  
Junwei Pu ◽  
Peipei Miao ◽  
Qian Wang ◽  
...  
Keyword(s):  
Land Use ◽  
Southwest China ◽  
Arable Land ◽  
Ecological Environment ◽  
Spatial Structures ◽  
Ecological Functions ◽  
Land Protection ◽  
Karst Areas ◽  
Functional Areas ◽  
Land Space

National land spatial planning is dominated by urban-agricultural-ecological functions and has become a Chinese national strategic issue. However, the three functional spaces have serious conflicts in the karst areas, causing inconsistencies in regional development and triggering poverty and a more serious situation for the ecological environment. In this study, we used the gray multi-objective dynamic programming model and the conversion of land use and its effects at small region extent model to simulate the developmental structures of future land use in the karst areas of Southwest China under a socioeconomic development scenario, an arable land protection scenario and an ecological security scenario. Finally, based on the coordination of the urban-agricultural-ecological functions, we used a functional space classification method to optimize the spatial structures of the national land space for 2035 year and to identify different functional areas. The results showed that the three scenarios with different objectives had differences in the quantities and spatial structures of land use but that the area of forestland was the largest and the area of water was the smallest in each scenario. The optimization of the national land space was divided into seven functional areas—urban space, agricultural space, ecological space, urban-agricultural space, urban-ecological space, agricultural-ecological space and urban-agricultural-ecological space. The ecological space was the largest and the urban-ecological space was the smallest among seven functional areas. The different types of functional spaces had significant differentiation characteristics in the layouts. The urban-agricultural space, urban-ecological space, agricultural-ecological space and urban-agricultural-ecological space can effectively alleviate the impacts of human activities and agricultural production activities in karst areas, promote the improvement of rocky desertification and improve the quality of the regional ecological environment. The results of this research can provide support for decisions about the balanced development of the national land space and the improvement of environmental quality in the karst areas.

scholarly journals Ecological and economic aspects of rational use and protection of land resources in Ukraine

2017 ◽  
Vol 19 (79) ◽  
Author(s):  
T. B. Nahirniak ◽  
R. S. Grabovsky ◽  
M. R. Hrytsyna
Keyword(s):  
Land Use ◽  
Agricultural Development ◽  
Agricultural Land ◽  
Arable Land ◽  
The State ◽  
Integrated System ◽  
Economic Aspects ◽  
Land Protection ◽  
Rational Use ◽  
High Level

The current state of land use in Ukraine is characterized by high agricultural development and land cultivation. The predominant share in the total land stock of Ukraine is occupied by agricultural land (70.8% of the country's territory). Ukraine accounts for about 0.45% of the world land fund, while arable land occupies 2.4% of its world-wide area. According to resource-based indicators of land use Ukraine is also characterized by an extremely high level of development of living space and only about 8% of the territory can be attributed to anthropogenically unchanged. Ecological and economic aspects of land use include of rational land use, which characterizes the optimal involvement of all lands in economic circulation and their effective use for the main purpose, creation of favorable conditions for increasing productivity of agricultural land and obtaining from the unit of area the maximum amount of products at the lowest cost of labor and funds. The article substantiates that degradation of soils has its own characteristics, caused by various factors and processes. It is established that the practice of land use and the state of study of the above problems will require further study of the preconditions for the development of land degradation processes caused by the main factors: human economic activity and climatic and relief-ground conditions. The existing system of land protection in agriculture due to the influence of a number of natural and economic factors, as well as insufficient attention from the state does not ensure their rational use. Therefore, it is necessary to adhere to an integrated system of protection of agricultural land.

scholarly journals Discrepancies in Karst Soil Organic Carbon in Southwest China for Different Land Use Patterns: A Case Study of Guizhou Province

2019 ◽  
Vol 16 (21) ◽  
pp. 4199
Author(s):  
Zhenming Zhang ◽  
Xianfei Huang ◽  
Yunchao Zhou ◽  
Jiachun Zhang ◽  
Xubo Zhang
Keyword(s):  
Land Use ◽  
Organic Carbon ◽  
Soil Organic Carbon ◽  
Soil Type ◽  
Southwest China ◽  
Potassium Dichromate ◽  
Soil Samples ◽  
Guizhou Province ◽  
Land Uses ◽  
Karst Areas

The assessment of soil organic carbon (SOC) in mountainous karst areas is very challenging, due to the high spatial heterogeneity in SOC content and soil type. To study and assess the SOC storage in mountainous karst areas, a total of 22,786 soil samples were collected from 2,854 soil profiles in Guizhou Province in Southwest China. The SOC content in the soil samples was determined by the oxidation of potassium dichromate (K2Cr2O7), followed by titration with iron (II) sulfate (FeSO4). The SOC storage was assessed based on different land uses. The results suggested that the average SOC density in the top 1.00 m of soil associated with different land uses decreased in the following order: Croplands (9.58 kg m−2) > garden lands (9.07 kg m−2) > grasslands (8.07 kg m−2) > forestlands (7.35 kg m−2) > uncultivated lands (6.94 kg m−2). The SOC storage values in the 0.00–0.10 m, 0.00–0.20 m, 0.00–0.30 m and 0.00–1.00 m soil layers of Guizhou Province were 0.50, 0.87, 1.11 and 1.58 Pg, respectively. The SOC in the top 0.30 m of soil accounted for 70.25% of the total within the 0.00–1.00 m layer in Guizhou Province. It was concluded that assessing SOC storage in mountainous karst areas was more accurate when using land use rather than soil type. This result can supply a scientific reference for the accurate assessment of the SOC storage in the karst areas of southwestern China, the islands of Java, northern and central Vietnam, Indonesia, Kampot Province in Cambodia and in the general area of what used to be Yugoslavia, along with other karst areas with similar ecological backgrounds.

scholarly journals Outmigration Drives Cropland Decline and Woodland Increase in Rural Regions of Southwest China

Land ◽  
2020 ◽  
Vol 9 (11) ◽  
pp. 443
Author(s):  
Yi Yu ◽  
Tingbao Xu ◽  
Tao Wang
Keyword(s):  
Land Use ◽  
Vegetation Index ◽  
Agricultural Sector ◽  
Southwest China ◽  
Labour Force ◽  
Arable Land ◽  
Sustainable Land Use ◽  
Land Use Patterns ◽  
Rural Regions ◽  
Normalised Difference Vegetation Index

Rapid urbanisation in China has led to massive outmigration in rural regions, which has changed the regional labour force structure and can have various profound impacts as a result. This research used a case study in Southwest China to investigate how regional land use patterns have been changed in the context of rural outmigration and assessed the resulting dynamics on local ecological environment. The key findings include: (1) The local land conversion process was mainly characterised by the conversion of farmland (−18.3%) to residential area (+268.3%) and woodland (+55.6%) during 2000–2018; (2) about 83.7% of area showed a statistically significant increase in the normalised difference vegetation index (NDVI), which was not due to human interference factors (e.g., afforestation). Correlation analyses showed that depopulation (R = −0.514, p < 0.01) and local mild temperature (R = 0.505, p < 0.01) could be the main contributors. Only 2.5% of the area had decreased NDVI and this was directly caused by human activities (e.g., urban area expansion). These results implied that vegetation improvement can occur in the context of depopulation and farmland reduction, which did not significantly threaten the local agricultural sector. It then could be a good choice to allow those high-slope and biophysically poor farmlands to undergo forest succession rather than cultivation. Farmers in Southwest China should make a full use of the existing low-slope arable land to curb the declining trend of local farmland amount, in order to meet the future challenges brought by urbanisation. Enhanced agricultural infrastructure, mechanised farming and guide from local government can help achieve this goal. This study provided new insights and more realistic scenarios for rural development in Southwest China. The research findings are expected to provide a better understanding to enable sustainable land use management in Southwest China.

scholarly journals Drive Mechanisms of Soil Quality Changes in Peri-Urban Areas

Land ◽  
2021 ◽  
Vol 10 (2) ◽  
pp. 171
Author(s):  
Hongbin Liu ◽  
Jie Lyu
Keyword(s):  
Land Use ◽  
Soil Quality ◽  
Urban Areas ◽  
Arable Land ◽  
Profit Maximization ◽  
Practical Significance ◽  
Available Phosphorus ◽  
Driving Mechanism ◽  
Land Protection ◽  
Use Behavior

The driving mechanism of soil quality (SQ) has important implications for arable land protection, sustainable agricultural development and ecological environment conservation. This study builds a “perception–response” theoretical framework to investigate how farmers’ land use behavior may affect SQ from the temporal and spatial perspectives. Based on soil sampling data, farmer survey data and socioeconomic statistical data collected in a typical peri-urban area of northeast China, geo-statistical analysis and econometric models have been applied to examine the effect of farmers’ land use behavior (FLUB) on SQ. The results show that during 1980–2010, the target of FLUB has been shifted from “grain output maximization” to “grain output and profit maximization” and then to “profit maximization”. The FLUB, including land use pattern, land use degree and land input intensity, also show obvious differences in space. These differences result in distinct impacts on the variation of SQ in time and space. Generally, the soil organic matter (OM) tends to decline, the available nitrogen (AVN) and available phosphorus (ANP) tend to rise, while the available potassium (AVK) increases after an initial decline. Moreover, the further distance from the city center, the greater the spatial variation of SQ in space. These findings are not only helpful from a theoretical and practical significance for policy-makers to improve SQ in the outskirts of metropolitan areas, but also make an important contribution to the sustainable development of peri-urban agriculture (PUA).

Assessment on the effect of city arable land protection under the implementation of China's National General Land Use Plan (2006–2020)

2015 ◽  
Vol 49 ◽  
pp. 466-473 ◽  
Author(s):  
Guoliang Xu ◽  
Xianjin Huang ◽  
Taiyang Zhong ◽  
Yi Chen ◽  
Changyan Wu ◽  
...  
Keyword(s):  
Land Use ◽  
Arable Land ◽  
Land Protection ◽  
Land Use Plan

scholarly journals Protection of a Landscape Park’s Area in The Spatial Extent of Impact of the Poznan Agglomeration, Midwestern Poland

2015 ◽  
Vol 34 (3) ◽  
pp. 268-280
Author(s):  
Beata Raszka ◽  
Eliza Kalbarczyk
Keyword(s):  
Land Use ◽  
Sustainable Development ◽  
Agricultural Production ◽  
Arable Land ◽  
Buffer Zone ◽  
Spatial Structures ◽  
Strategic Objectives ◽  
Spatial Policy ◽  
Anthropic Pressure

Abstract This paper points out possibilities for limiting anthropic pressure in the Puszcza Zielonka Landscape Park in Poland. Based on the identification and evaluation of the most precious fragments of the environment, it determines the attractiveness of the park perceived as a complex multi- -ecosystem. It also identifies the main spatial problems and symptoms of anthropic pressure. The evaluation was conducted through establishing zones with similar environmental value and the determination of hemeroby indicators. The following basic problems were identified: recreational buildings and the development of settlements, cessation of agricultural production, further division of arable land into smaller plots in the buffer zone, combined with a change of land use. The final result of this research is a map of the functional and spatial division of the park, allowing for its protective, biocenotic and scientific functions and possible use for recreation in line with the principles of sustainable development. We ascertained that the strategic objectives and criteria for shaping spatial structures of protected areas should be included in the local spatial policy.

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