| China's mountainous areas are vast,with a large proportion of sloping arable land,the abandonment of arable land is not only related to the rational use of agricultural land in mountainous areas and the formulation of sustainable development policies in mountainous areas.Therefore,this paper takes Langxi Trough Valley in 2004,2010,2014 and2017.Huajiang Valley in 2004,2010,2015 and 2018;After Houzhai River area in 2004,2010,2015,2018,remote sensing image as data sources,such as through the landscape pattern index based on the study area,buffer analysis and the analysis of the abandoned land distribution pattern in elevation,evolution law,factors and the effect of abandoned,at the same time summarized three typical similarities and differences between characteristics of abandoned land distribution pattern in the study area.It is concluded that:(1)In 2004?2010?2015 and 2018,the abandoned land areas of Houzhai River were 52.66hm~2?53.36hm~2?65.06hm~2 and 1222.8hm~2respectively;In 2004?2010?2014 and 2018,they were 583.9hm~2?937.98hm~2?1650.85hm~2 and 1030.48hm~2 respectively In Langxi Trough Valley;In 2004?2010?2015 and 2018,they were 27.48 hm~2?59.3 hm~2?71.05 hm~2 and 142.84 hm~2 respectively In Huajiang Valley.The area of fallowed farmland in Houzhai River basin research area was the largest,followed by that in Langxi Trough Valley area,and that in Huajiang Valley area was the least.In terms of patch size,the single area of abandoned land in the Houzhai River basin research area is the largest,followed by the Langxi Trough Valley area and the Huajiang Valley area.The distribution characteristics of abandoned land in the Langxi Trough Valley area are closely related to the distribution pattern of farmland.The area of abandoned land in the area varies significantly with the elevation,especially in the gentle hills and plateau with high elevation within the range of 1047m~1202m.However,there is a strong regional situation of cultivated land being abandoned in the Huajiang Valley.In some areas,due to the influence of rocky desertification,no cultivated land is distributed,so the phenomenon of cultivated land being abandoned does not exist.The phenomenon of fallow is more obvious in the mountainous areas in the southeast of Houzhai River research area.(2)The phenomenon of abandoned farmland in Houzhai River research area evolved from high elevation to low elevation,while that in Huajiang Valley area and Langxi Trough Valley area was different.The cultivated land in Huajiang Valley area was mainly distributed in the elevation range of 713m~1390m.Therefore,the phenomenon of abandoned farmland in this area was prominent,and the phenomenon of abandoned farmland also evolved from higher to lower elevation within this range.On both sides of the bottom of the Langxi Trough Valley,arable land was abandoned from the mountain,and on the top plateau,arable land was gradually abandoned from the mountain.The evolution direction of abandoned land is also diversified.Most of the abandoned farmland on the top of the gentle plateau at the southeast side of the Langxi Trough valley is cultivated by means of land transfer in flue-cured tobacco,medicinal herbs and other cash crops.In addition,the abandoned land in Huajiang Valley was planted with cash crops such as flowers and honeybees,which effectively promoted the intensive land use.However,the study area of Houzhai River has a higher degree of intensive land use due to its natural environment than the other two areas.(3)From the perspective of human activities,cultivated land is abandoned due to the decrease of labor force in all regions.Taking the typical rural settlements in each research area as an example,it is revealed that labor migration leads to the decrease of resident population in settlements,which gradually forms atrophic settlements and causes serious cultivated land abandonment.In terms of distance from rural settlements,the distance from rural settlements in the whole Huajiang Valley area has the greatest impact on the change of abandoned land,followed by the Langxi Trough Valley.From the distance to the rural roads,the hilly and mountainous areas in the Houzhai River have an obvious influence on the change of abandoned land.(3)The Langxi Trough Valley area is relatively outstanding social and economic effect,the cultivated land abandoned after into other ways of land use,centralized management of economic crops on land,land circulation to increase land rent,greatly improving the land economic effect of local economic development dominated by agriculture for farmers livelihood model into intensive land use mode of production and enhance the economic income of farmers,promote the economic development of the region,Huajiang Valley area of abandoned land ecological environment effect is more outstanding,because itself,fragile ecological environment,farmland abandoned gradually evolved after the forest,bringing the important effect to the local ecological environment restoration.After being abandoned,the cultivated land shows diversified evolution,and the land is gradually used intensively and the cultivated land evolves into forest and grass,which promotes the economic development and improves the ecological environment,which plays an important role in the development of rural industry,the beautiful countryside and the construction of ecological countryside. |
PDF Full Text Request