Farmland Consolidation Research Articles

ほ場整備 (水田) とビオトープ

ほ場整備 (水田) とビオトープ

秋田県駒場北地区における生態系保全対策手法 (淡水魚) の実施例

秋田県駒場北地区における生態系保全対策手法 (淡水魚) の実施例

Estimation of shallow gravelly layer distribution by combined method with infrared color aerophotograph and topographic map before farm land consolidation

Estimation of shallow gravelly layer distribution by combined method with infrared color aerophotograph and topographic map before farm land consolidation

A refined hydro-environmental watershed model with field-plot-scale resolution

A distributed hydro-environmental model is developed that achieves detailed analysis of the movement of water at a field-plot-scale resolution in a mesoscale watershed including lowland areas where, especially for agricultures, it is an essential need to get rid of redundant groundwater by drainage facilities such as rivers, canals and/or underdrains. For this, the problem geometry is meshed with unstructured cells of triangular shape. Profile of a column cell is zoned into two: surface zone and groundwater zone in which water movement is represented by combined tank and soil moisture sub-models, and well-defined two-dimensional unconfined shallow groundwater flow sub-model, respectively. The top-two sub-models serve to evaluate evapotranspiration, infiltration, soil water content, lateral surface water flow, and vertical percolation. The vertical percolation so evaluated is given as longitudinal recharge to the bottom sub-model for computing groundwater flow. Surface water–groundwater interactions through beds and stream-banks of perennial and ephemeral canals are considered by treating the canal courses as internal boundaries in the groundwater flow model. The finite volume method (FVM) that allows of unstructured mesh and produces conservative solutions is employed for groundwater flow computation. The model developed is applied to an actual watershed which includes a low-lying paddy area to quantify the hydrological impact of land-use management practices over a period of 29 years in which the farmland consolidation project was implemented and part of the paddy fields were converted to upland crop fields and housing lands. From the results obtained, it is concluded that the model presently developed lends itself to water—as well as land-use management practices.

Constrained Minimum-k-Star Clustering and its application to the consolidation of farmland

The present paper introduces and studies a new combinatorial clustering model for the consolidation of farmland. While the general problem turns out to be NP-hard even in quite restricted cases, the Size-restricted Minimum-k-Star Group Partition problem is solvable in polynomial time. Based on this tractability result, we derive a general approximation algorithm which, as the mathematical analysis and economic evaluation shows, performs well in theory and practice.

History and Role of Farm Land Consolidation in Hokkaido

History and Role of Farm Land Consolidation in Hokkaido

Vegetation Recovery Works for Slope Protection in Farmland Consolidation Project

Vegetation Recovery Works for Slope Protection in Farmland Consolidation Project

Plants Relocation Practices for Conservation of Declared Rare Floras in Implementation of Farmland Consolidation Project

Plants Relocation Practices for Conservation of Declared Rare Floras in Implementation of Farmland Consolidation Project

The economics of land fragmentation in the north of Vietnam*

Land fragmentation, where a single farm has a number of parcels of land, is a common feature of agriculture in many countries, especially in developing countries. In Vietnam, land fragmentation is common, especially in the north. For the whole country, there are about 75 million parcels of land, an average of seven to eight plots per farm household. Such fragmentation can be seen to have negative and positive benefits for farm households and the community generally. Comparative statics analysis and analysis of survey data have led to the conclusion that small‐sized farms are likely to be more fragmented, and that fragmentation had a negative impact on crop productivity and increased family labour use and other money expenses. Policies which allow the appropriate opportunity cost of labour to be reflected at the farm level may provide appropriate incentives to trigger farm size change and land consolidation. Policies which tip the benefits in favour of fewer and larger plots, such as strong and effective research and development, an active extension system and strong administrative management, may also lead to land consolidation.

Farm Land Consolidation with Consideration to Disaster Prevention against the Flood

Farm Land Consolidation with Consideration to Disaster Prevention against the Flood

Water Environmental Conservation by Farm Land Consolidation and Future Subjects in Akaiyachi Mire

Water Environmental Conservation by Farm Land Consolidation and Future Subjects in Akaiyachi Mire

Farm Land Consolidation in Landslide Area

Farm Land Consolidation in Landslide Area

Problem with Underdrain Plan in Farm Land Consolidation and an Example its Solution

Problem with Underdrain Plan in Farm Land Consolidation and an Example its Solution

Problems for Organizing Collective Farming System in Farm Land Consolidation Areas of lsawa Ward

Problems for Organizing Collective Farming System in Farm Land Consolidation Areas of lsawa Ward

Evaluation of the Intrinsic Environment Changes Resulting from Farm Land Consolidation in a Hilled Area

Evaluation of the Intrinsic Environment Changes Resulting from Farm Land Consolidation in a Hilled Area

Habitat factor of Japanese rice fish in paddy field area, focusing on the structure of irrigation and drainage canal.

Japanese rice fish is a fresh water fish that represents the paddy field area. In this research area, Kanzaki district in Iwate Prefecture, a farm land consolidation is planned in fiscal 2007, therefore the consideration plan to habitation of the fish is requested on this research area. Then, we were investigated to clarify habitat factor of the fish in the paddy field area in this research. As a result, early flow velocity into the canal and the head between the paddy field and the ditch was a negative factor for the life of the fish in irrigation period. On the other hand, a high water temperature into the canal was a positive factor for them in non-irrigation period.

Summary of Comprehensive Evaluation of the Farm Land Consolidation Projects

Summary of Comprehensive Evaluation of the Farm Land Consolidation Projects

Monetary Calculation of the Project Effects in Comprehensive Evaluation of the Farm Land Consolidation Projects

Monetary Calculation of the Project Effects in Comprehensive Evaluation of the Farm Land Consolidation Projects

平地水田地帯の畦畔利用におけるトウキョウダルマガエルの個体数密度を規定する要因

In this research, in order to clarify ecological significance of the levees in flatland paddy fields, the habitat density of the frog, Rana porosa porosa on each levee type was investigated. The investigation was conducted in the Isawa area in the southern part of the Iwate pref. in the early summer in 2002. The number of Rana porosa porosa in the paddy fields that were rearranged to large units in the recent years, has decreased. It has been suggested that the disappearance of traditional earth waterways and the reduction of levees might have caused the decrease of the frog species in the paddy fields. Our research shows that on the levees attached to waterways the number of the frog species significantly varies according to the material that is used for the waterway. That is, the number becomes smaller when it was altered to concrete from the naked soil. At the same time, we did not find any significant difference in the amount of food for this frog species between in the concrete waterways and in the earth waterways. This suggests that the amount of food does not cause the discrepancy between the number of the frog species in the concrete waterways and the number of one in the earth waterways. On the levees between the paddy fields in the area that was consolidated before the recent consolidation, the number of the frog species considerably varies according the moisture condition of the area. This indicates the importance of levees as pieces of land in water, narrow walkways between paddy fields that are filled with water. As opposed to the levees between paddy fields, the levees attached to earth waterways hold high density of the frog species. This verifies that Rana porosa porosa have an affinity to the levees attached to the earth waterways. The significant factors of how this frog species choose what kind of levees to frequent, are more structural, i.e., the structural changes of the paddy fields that are caused by the modern farmland consolidation, the existence of attaching waterways and the material of the waterways, than administrative, i.e., water management and weeding. Also, we verified that the amount of food is not especially a regulative factor in terms of the density of the frog species on the levees.

Financing mode for sustainable farmland consolidation

Sustainable farmland consolidation covers ecology, economy and society, which means, its only goal is to protect eco-environment, in accordance with public benefits and economic laws. China is still a developing country, facing capital-lacking, an important but difficult problem, while sustainable farmland consolidation will need more money than common farmland consolidation. To solve the problem, this paper put forward and designed a new financing mode for farmland consolidation: BOT (Build-Operate-Transfer), which can effectively solve the financing problem and investment reclamation by the way of concession, and make sustainable farmland consolidation be realized in China.