Morphological Characteristics And Physicochemical Properties Of Nabkhas On Slopes In Bashang Region,Hebei Province

The weather in Hebei Bashang winter and spring season and unreasonable human activities, lead to a large area of grassland and farmland desertification. As the advantage of Shrub Vegetation in Hebei Bashang of Caragana microphylla shrub species, by slowing down the speed, intercepting sand, formed a lot of Caragana microphylla shrub sand, especially on slope in the northeast of Kangbao County. But on sloping grassland of Nabkhas morphological characteristics and soil physical and chemical properties are not enough. Therefore, Based on the field investigation and lab sampling method, the morphological characteristics and physicochemical properties of Caragana Nabkhas been analyzed in different slope position and slope direction at the he Bashang of Hebei Kangbao County in order to keep the Slope natural Caragana Nabkhas stability and ecological efficiency. The results were as follows:(1) On the overall shape Nabkhas is convex oval sandbags on slope. But the length, width and height of the development of Nabkhas in the different slope position and slope aspects of the investigated hills have the obvious difference. The rules:from the top to the foot of the investigated hills, the length, width and height of the morphology parameters gradually increase; the morphology parameters of Nabkhas for the windward slope is larger than that for the leeward slope。(2) There were good relationships among morphological parameters of the length, width and height of Nabkhas on slope. But the correlation coefficients of the long axis and short axis, high and horizontal scale presents different trends in the different slope position and slope aspects of the investigated hills. The rules:from the foot to the top of the investigated hills, the correlation coefficients of long axis and short axis, high and horizontal scale gradually increase; the correlation coefficients of the long axis and short axis, high and horizontal scale for the windward slope is higher than that for the leeward slope, but the correlation coefficients of long axis and short axis is higher than the leeward slope foot of the investigated hills.(3) The soil particles content shows a different trend in the different slope position and slope aspects of the investigated hills. The rules:From the foot to the top of the investigated hills, fine sand, very fine sand,very coarse sand and silt content gradually increase; medium sand and coarse sand gradually decrease; From the different slope, the different slope positions in the windward side of Nebkhas on the surface of sand particle, silt, very fine sand and very coarse sand content are less than the leeward slope of the same slope position percent content; fine sand,medium sand and coarse sand content are greater than the leeward slope of the same slope position percent content.(4) The bulk density analysis of Nabkhas shows that, from the foot to the top of the investigated hill, the bulk density becomes smaller, and the bulk density of the windward slope is greater than that of the leeward slope.(5) The surface soil moisture analysis of Nabkhas shows that, from the foot to the top of the investigated hill, the surface soil moisture becomes larger, and the surface soil moisture of the windward slope is less than that of the leeward slope.(6) The soil hardness analysis of Nabkhas shows that, from the foot to the top of the investigated hill, the soil hardness becomes larger, and the soil hardness of the windward slope is less than that of the leeward slope.(7) The content of the Soil nutrients analysis of Nabkhas shows that, from the foot to the top of the investigated hill, the content of organic matter,total N and total P become more; in addition to the windward slope foot of Nabkhas content of the organic matter, total N and total P are more than the leeward slope foot of Nabkhas, the windward slope middle and top of the investigated hill the content of organic matter、total N and total P are few than the leeward slope middle and top of the investigated hill.(8) The content of pH value analysis of Nabkhas shows that, from the foot to the top of the investigated hill, the content of pH value becomes smaller; in addition to the windward slope foot of Nabkhas content of pH value is less than the leeward slope foot of Nabkhas, the windward slope middle and top of Nabkhas content of the pH value is higher than the leeward slope middle and top of the investigated hill.