Effects Of Land Use And Its Changes On Soil Physical And Chemical Properties In Typical Areas Of The Yellow River Delta

The the Yellow River delta is one of the fastest estuarine deltas to form soil in China,to explore the effects of different land use changes on soil physical and chemical properties during the land use process is of great significance to soil fertility conservation and sustainable utilization of land resources in the region.This paper,from the influence of different land use patterns on soil physical and chemical properties of the effects of land use change on soil physical and chemical properties of the two aspects of the impact of land use change in the Yellow River Delta area on soil physicochemical properties are discussed.Selected two two typical areas Kenli county and Wudi County in the Yellow River delta,selects five different ways of land use: cultivated land,grassland,saline desert land,garden and woodland.Cultivated land is divided into four types: dry land,irrigated land,vegetable land and paddy land,through outdoor investigation and laboratory analysis to study the effects of different land use on physical and chemical properties.The results showed that: Soil physical and chemical properties were significantly affected by land use patterns.Bulk density is small and the field capacity is large in cultivated land and garden,bulk density is large and the field capacity is small in saline desert land,the forest and grassland is in the middle;Bulk density is small and the field capacity is large in paddy land,bulk density is large and the field capacity is small in dry land,irrigated land and vegetable land is in the middle in different cultivated landuse;The pH value of different land use patterns from large to small is saline desert land >garden>cultivated land>woodland>grassland,different cultivated land use patterns from large to small is vegetable land> paddy land > irrigated land > dry land;The OM and macroelement value of different land use patterns from large to small is grassland> woodland>cultivated land> saline desert land >garden,different cultivated land use patterns from large to small is dry land >vegetable land> irrigated land > paddy land;There is no obvious law of the medium elements and microelement,but in different land use patterns the content of grassland and woodland is higher,and the content of garden is lower;in irrigated land and vegetable land is generally higher than that of dry land and paddy fields with different.In county scale,two periods of data were used in 1986 and 2006,selects nine kinds of land use change pattern were studied: the cropland,saline desert land and forest and grass land that landuse does not change for ten years,cropland into saline desert land,forest and grass land,forest and grass land into cropland,saline desert land,and saline desert land into cropland and forest and grass land.The results showed that: During the ten years,there are 4 kinds of of land use change pattern that the content of organic matter and macroelement decreased,they are the cropland that landuse does not change for ten years,cropland into saline desert land,forest and grass land into cropland,saline desert.During the ten years,there are 5 kinds of of land use change pattern that the content of organic matter and macroelement increase,saline desert land and forest and grass land that landuse does not change for ten years,cropland into forest and grass land,and saline desert land into cropland and forest and grass land.Two data from 2006 to 2016 were used at the point scale.Eight types of land use change were selected for physical properties.They are saline desert land and cropland that landuse does not change for ten years,grass land into cropland,saline desert land into cropland and vegetable land,cropland into forest land and saline desert land,saline desert land into forest land.The results showed that: Different land use change pattern have significant effects on soil unit weight and field capacity.There are 5 kinds of land use change pattern that the physical properties change worse,they are saline desert land and cropland that landuse does not change for ten years,grass land into cropland,saline desert land into cropland and vegetable land.There are 3 kinds of land use change pattern that the physical properties change well,they are cropland into forest land and saline desert land,saline desert land into forest land.Eight types of land use change were selected for chemistry properties.They are saline desert land and cropland that landuse does not change for ten years,saline desert land into forest land and grass land,cropland into vegetable land and saline desert land,forest land and grass land into cropland.The results showed that:Different land use change pattern have significant effects on soil chemistry properties.There are 4 kinds of land use change pattern that the chemistry properties change well,they are saline desert land that landuse does not change for ten years,saline desert land into forest land and grass land,cropland into vegetable land;There are 4 kinds of land use change pattern that the chemistry properties change worse,they are cropland that landuse does not change for ten years,cropland into saline desert land,forest land and grass land into cropland.This paper takes Kenli county and Wudi County of the Yellow River Delta as the research object,the influence of different land use patterns on soil physical and chemical properties were analyzed.And taking Kenli County as the research area,the effect of land use change on soil quality by 1986,2006 2016 three data were analyzed.The results can provide reference for the improvement of soil fertility and sustainable utilization of soil resources in this region.