The landform types are loess hills covered with sand and sand. The main soil types are cotton sand, hard loess, red clay, aeolian sand, and dam silt. Vegetation types belong to the shrub grassland type. Most of the natural vegetation has been destroyed and artificially remedied. Gradually, the vegetation succession stage, which is dominated by S. bungeana-P. vulgaris, D. dauribreviflora, Artemisia and Artemisia ordosica, has gradually entered. In each sampling point, an earthen borer was used for stratified sampling. The depth of 0 to 10 cm soil layer took a sample every 5 cm, the depth of 10 to 60 cm soil layer took a sample every 10 cm, and the soil was determined by drying method (105e, 10 h). Water content. Agricultural land management is general field crop management; grassland vegetation is ploughing 35 to 36 years from the farmland and basically reduced to S. bungeana. At the same time, portable GPS and compass are used to determine the terrain factors such as slope, aspect and altitude of each sample.
Soil moisture tester After measuring the soil moisture in this area, we can find that diversification of land use patterns on slope land increases the coefficient of variation of soil moisture. Land use structure change is one of the most critical factors leading to soil moisture variation. There is a clear spatial structure for soil moisture in the mixed use of agricultural grasses. Under dry conditions, the average water content in the 0-60cm soil layer maintains a relatively high base station value and range, while the nugget/abutment ratio is relatively low, and they are significantly different with the soil profile distribution, which further explains Different climatic conditions, such as rainfall, can change the variation degree and distribution pattern of soil moisture. In the study of spatial variation of water, different sampling designs should be adopted according to the average water content.
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The vents help and speed cooling down of the head. The more the vents are set, the greater the reduction in sweat, but it also makes the helmet hot. Since the vents allow air to blow in to the outer layer of the helmet and the inner frame keeping in the cool air is necessary for a durable helmet.
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