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Wang L.,China Agricultural University | An P.,China Agricultural University | An P.,Key Laboratory for Agricultural Land Quality Monitoring and Control | Pan Z.,China Agricultural University | And 2 more authors.
Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering | Year: 2013

Cultivated land quality is a key factor of national economic and social sustainable development. The change of cultivated land quality with climate change has become one of the hot research areas in global change in recent years. Based on the meteorological data, soil information and field experimental data were used, utilizing the Wageninngen method recommended by the Food and Agriculture Organization (FAO) to calculate the potential productivity of potato and spring wheat from 1989 to 2009 in Wuchuan County, Inner Mongolia, a typical semi-arid climate-sensitive area in North China. We examined the influence of climate change on production potential, the standard cropping system, and the yield. Further, by the method of regulations of Farmland classification, we used the data of potential productivity and land use to analyze the changes of natural quality grades and utilization grades under climate change. The results showed that: (1) The annual temperature of Wuchuan County increased at an average rate of 0.57°C/10a during 1967-2009. The precipitation varied greatly among the years, and the annual precipitation declined slightly over time. The soil relative humidity in soil layers 0-10 cm and 10-20 cm depth in crop growing season (April-September) in the period 1989-2009 had a decreasing trend with an average rate of 1.8%/a and 1.5%/a, respectively. Drought index increased noticeably. In conclusion, Wuchuan County was getting warmer and dryer under climate change. (2) Most of the cultivated lands were the dry lands in Wuchuan county (accounting for more than 90%), but the irrigated lands increased in recent years. The main crop in Wuchuan county was potatoes in 2009 instead of spring wheat in 1989. The planting area of potatoes increased from 8.4% to 39.8%, while spring wheat planting area decreasing from 52.1% to 17.1% in the period 1989-2009. (3) The production potential of the potatoes and spring wheat showed a declining trend under the dry warming climate in Wuchuan county. The production potential of potatoes decreased more obviously than spring wheat. Precipitation was the main factor affecting the production potential of potatoes and spring wheat. The natural quality grade index of dry land and irrigated land in the period 1989-2009 had an obviously decreasing trend with an average rate of 2.1/a and 0.5/a, respectively. The natural quality index of irrigated land was significantly higher than that of dry land. The dry land utilization grade index showed a descending trend, but the irrigated land utilization grade index showed a rising trend. The utilization grade index of the irrigated land was also significantly higher than that of the dry land, and the influence of climate change in the dry land was greater than in the irrigated land. However, the effect of land utilization by human activities in the irrigated land was greater. Therefore, as a comparative system between dry land quality and irrigated land quality, water is the major constraint to the cultivated land quality grade. This research can provide the scientific basis for formulation of the land-use system, protection and improvement of the quality of cultivated land under the background of climate change. Source


Chen L.,China Agricultural University | Chen L.,Key Laboratory for Agricultural Land Quality Monitoring and Control | Hao J.,China Agricultural University | Hao J.,Key Laboratory for Agricultural Land Quality Monitoring and Control | And 8 more authors.
Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering | Year: 2015

With the rapid industrialization and urbanization, the food security in China is not only just about maintaining a growth of total grain production, but also about keeping the increase of grain yield at a sustainable and steady pace. For the purpose of food security and social development, it is meaningful to study the yield increasing potential of grain and its spatial differentiation in Huang-Huai-Hai Plai, one of the main grain production areas of China. According to the land use data, this study selected 309 counties in this area as research units and used the method of exploratory spatial data analysis (ESDA) to investigate the spatial distribution pattern of balanced yield increasing potential. On the basis of the balanced thoughts, this study established a theoretical framework of promoting further grain productivity growth in study area. The balanced growth of grain yield consists of 3 progressive types (spatial, temporal and functional balanced growth of grain yield). Spatial balanced growth of grain yield, which is easy to achieve, is to make the small spatial cell (such as county) with different productivities of food reach a balanced and quite higher output. Increasing gain yield evenly in space can be achieved by adopting a series of measures on land consolidation. Using advanced science and technology to achieve multiple cropping is called temporal balanced growth of grain yield. The balanced yield increasing is not only to increase the biological output (grain production) but also to synergistically improve the other functions of cultivated land, which is functional equilibrium. The process to achieve the balanced growth of grain yield is gradual. This paper revealed the spatial balanced yield increasing potential of grain and its spatial differentiation in the main grain production areas in China. The methods included an analysis of the approaches to improve grain yield in Huang-Huai-Hai Plain based on balanced thoughts, calculation of the balanced yield increasing potential by using land use data in 2012, and description of its spatial differentiation of the study area. Then, the spatial distribution pattern of balanced yield increasing potential was analyzed by using the method of spatial autocorrelation analysis and GIS technology. Additionally, according to the distribution result and yield increasing potential of the 309 counties, the land consolidation types of Huang-Huai-Hai Plain were classified. The result showed that the balanced yield increasing potential of grain was 3304.57×104 t approximately, the spatial quality potential was 2413.74×104 t and the spatial quantity potential was 890.83×104 t in Huang-Huai-Hai Plain. By comparing the potential of grain production calculated using different methods, it was easy to conclude that the main mode to increase output was to improve the quality of cropland by upgrading medium-and low-yield farmland. In addition, the potential of the southern part of Huang-Huai-Hai Plain was higher than that of the northwestern part. The spatial balanced yield increasing potential of grain, the yield increasing potential in different ways and the strength index of yield increasing potential all showed the remarkable characteristic of spatial distribution. Meanwhile, there was a positive autocorrelation in spatial distribution of yield increasing potential. Spatial agglomeration types were High-High and Low-Low type. According to the distribution pattern of spatial agglomeration and the yield increasing potential, the land consolidation of Huang-Huai-Hai Plain was divided into 4 types, which were the same as the potential sources of grain yield increasing. This study provides valuble information for setting up directions and developing ways of equilibrium increasing output based on local conditions of Huang-Huai-Hai Plain. ©, 2015, Chinese Society of Agricultural Engineering. All right reserved. Source


Chen L.,China Agricultural University | Chen L.,Key Laboratory for Agricultural Land Quality Monitoring and Control | Hao J.,China Agricultural University | Hao J.,Key Laboratory for Agricultural Land Quality Monitoring and Control | And 8 more authors.
Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering | Year: 2014

Study on the relationships between grain production and cultivated land productivity and its regional difference is of great significance for food security. Besides, it is also important for finding regional potential yields of grain, improving the utilization efficiency of cultivated land resources and achieving the regional increase of grain yield. In this paper, on the basis of agro-ecological zoning (AEZ) model, a new method was proposed to calculate the cultivated land productivity under cultivated land quality modification. Furthermore, the modification of cultivated land quality was based on a new concept that the quality of cultivated land was not only affected by natural factors but also by artificial factors such as irrigation canals, greenhouse, nursery factory, mechanical facilities and its supporting service station. By discussing the conceptual system of cultivated land integrated productivity which took the potential quantity of cultivated land and the quality index of cultivated land into the consideration, we proposed that comprehensive productivity of cultivated land was the maximum sustainable production capacity for food under the certain economic and technological conditions, and it was strongly affected by the quality and quantity of cultivated land. Additionally, according to the concept, we built a model which can reveal the relationship between grain production and cultivated land productivity. This model was made up of comprehensive yield and productivity index of cultivated land (CLYPCI), cultivated land quality productivity index (CLQLPI), and cultivated land quantity productivity index (CLQNPI). The CLYPCI was used to measure the efficiency of cultivated land grain production and to reveal the relationship between actual output of grain and cultivated land productivity in a particular area. The CLQLPI was used to describe the average output efficiency of a regional cultivated land. The CLQNPI was used to measure the degree of exploitation and utilization of cultivated land in terms of quantity. This model was constructed based on the improved AEZ model, so it was only suitable for researching the relationship between grain production and cultivated land productivity at large or medium scales. At last, in this paper Quzhou county was used as a case study for model validation. The value of CLYPCI, CLQLPI and CLQNPI was 0.16, 0.31, 0.99, respectively in Quzhou. The results showed that the output efficiency and the average development level of cultivated land were not high in general. The potential of increased quantity of cultivated land was low, but the potential of increased yield of cultivated land was high. Compared with the cultivated land comprehensive productivity (CLCP), the CLYPCI value of different towns was reduced with CLCP which was sorted from the largest to smallest except Disituan town. The output of cultivated land was proportional to its productive capacity by comparing CLCP and CLYPCI of various towns. In addition, the value of CLQLPI and CLQNPI of different towns were very similar. The CLQLPI of 10 towns fluctuated around 0.31 which was the average value of CLQLPI of Quzhou. The CLQLPI in Yizhuang was the highest. The CLQNPI of 10 towns fluctuated around 0.99 and there were six towns whose CLQNPI value was 0.99. The CLQNPI of Yizhuang was also the highest. There was little chance to increase the quantity of cultivated land for Yizhuang. ©, 2014, Chinese Society of Agricultural Engineering. All right reserved. Source


Gao Y.,China Agricultural University | Gao Y.,Key Laboratory for Agricultural Land Quality Monitoring and Control | Zhang F.,China Agricultural University | Zhang F.,Key Laboratory for Agricultural Land Quality Monitoring and Control | And 6 more authors.
Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering | Year: 2016

As an effective measure, rural residential land consolidation can not only intensify the rural residential land use, but also relieve the contradiction of urban and rural land use. We used the geological data and economic social materials gotten by GIS spatial techniques, global observation and interviews, and made empirical researches in Wuxiang County, Shanxi Province. Firstly, divide the type of rural residential land consolidation. As the diversity in terrain, economy and population structure, the rural settlements were different. This study chose 8 factors in 3 aspects, and used them to classify the settlements into 4 types, which were geological disaster type, urban development type, natural recession type and internal development type. It was very meaningful to divide villages of the study area into respective rural residential land consolidation types, because it not only helped us find out the current situation of the overall rural residential land utilization, but also coordinated the consolidation potential of individual village. So the division of rural residential land consolidation types was the basis for other researches of rural residential land consolidation. Then, establish the game theory model about consolidation willingness between local government and village collective, and use it to analyze the feasibility of different rural residential land consolidation types. As the administrator of the region, the government wanted to improve the living condition of peasants and raise the level of economic development through rural residential land consolidation. Also, villagers were the immediate stakeholders of rural settlement, so they had rights to determine whether the land is consolidated or not. With the property of public welfare, the local government had the leading role in rural residential land consolidation, so this game model was the dynamic game of complete information, which meant the local government took action first. The strategies of peasants were affected by the actions of the government. If the local government would like to consolidate the rural settlement, it would provide compensation for the villagers, and the villagers could spend less. If the local government would not like to do it, the peasants would suffer from more stress which came from funds. Based on this, we deployed the multi-factor assessment method to evaluate the willingness of the 2 players. We considered gains and cost when the government took action, containing 5 indices which were consolidation potential, population, rural housing land area per capita, terrain niche and distance between settlements and main streets. We chose 6 indices on the aspects of population structure, living condition, development prospect to analyze the willingness of villagers. We chose 24 settlements to evaluate, and found that the settlements of Payoff I could be consolidated, the government had better provide policies beneficial to settlement consolidation for payoff II, the settlements of Payoff III could be improved by the villagers, and the settlements of Payoff IV needn't be consolidated in the near future. The study can provide an effective reference for rural residential land consolidation, and the accuracy of its result is also associated with the work plan of rural residential land consolidation. © 2016, Editorial Department of the Transactions of the Chinese Society of Agricultural Engineering. All right reserved. Source


Li P.,China Agricultural University | Lu Y.,China Agricultural University | Zhang C.,China Agricultural University | Zhang C.,Key Laboratory for Agricultural Land Quality Monitoring and Control | And 5 more authors.
Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery | Year: 2016

Beijing-Tianjin-Hebei Region is one of the most important developing regions in China, which relates to the national development strategy. The paper's purpose is to analyze the fragmentation degree and artificial interference of the cultivated land. The space grid was taken as the basic unit and the density of cultivated land was calculated by kernel density function. And the density zoning was realized by natural breaks method. Then, the spatial distribution characteristics and the fragmentation degree of the cultivated land quantitatively were analyzed by using landscape pattern indexes. Finally, the direction of the consolidation of cultivated land was indicated by making a comparative analysis of the cultivated land fragmentation index and the artificial disturbance index. The results show that, the variation range of the density of cultivated land is 0~95.08 points/km2, and more than 85% of the cultivated lands are distributed in the medium to high density region, centrally located in the central and southeastern of the region. The cultivated land area was decreased with the reduction of density value. The patch density, patch edge density, area weighted fractal dimension and the variation of the degree of aggregation in different density zones of the cultivated land all showed that, the fragmentation of the cultivated land was increased with the reduction of density value, but it was decreased with the reduction of density value in different density zones of artificial landscape. Both the degree of fragmentation and the degree of artificial disturbance were increased gradually with the increasing density value of cultivated land. And the human disturbance is the main factor to the increasing fragmentation in the region. Using kernel density function method can reflect the aggregation degree and the change characteristics of fragmentation of cultivated land more reasonably, and it can provide a reference for land consolidation and land use optimization in Beijing-Tianjin-Hebei Region. © 2016, Chinese Society of Agricultural Machinery. All right reserved. Source

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