| In the desert steppe of Ningxia,the effects of different ridges on the soil water and water balance of the artificial Caragana korshinskii forest were studied,and the suitable method of locusts in the desert steppe of Ningxia was determined,which had an important impact on the ecological civilization construction and animal husbandry production and construction in the area.This experiment takes the 5-year-old artificial Caragana forest in the desert steppe of Liuyangbao Village in Yanchi County,Ningxia,and uses the spatial gradient instead of the time gradient method to separate the spleen belt(WP)and the Pingyi area of the Ningxia desert steppe.G1P1),two belts in the two belts(G2P2),three belts in the three belts(G3P3),five belts in the five belts(G5P5)water,vegetation,soil and other aspects of the analysis,the study found:(1)The effects of soil moisture on the inner belt were significant(P<0.05),and the trend of soil moisture in the belt was the same.The soil moisture content of G3P3 was higher than that of the other flats in each month.The soil moisture of 0-200cm soil layer in the vertical direction was mainly concentrated in 60?100cm soil layer,and the water content of 60?80cm soil layer was significantly higher than the rest.Soil layer(P<0.05).(2)There were 19 species of plants in the five species of Pingtiao in the study area.The different Pingyao methods had significant effects on the Margalef species richness index,Shannon-Wiener diversity index and Simpson dominance index(P<0.05).(3)The daily transpiration rate of Caragana korshinskii leaves peaks from 12:00 to 16:00 daily,and the lowest peak of daily transpiration rate appears at 6:00-8:00 and 16:00-18:00.Caragana korshinskii has the highest transpiration during the full leaf extension period.(4)The grain size composition of the soils in the strips of the five species of Pinus sylvestris was mainly composed of silt and sand.The soil particle size of the five species of Caragana korshinskii forests was significantly different(P<0.05),among which G3P3 Caragana forest The content of clay and powder was significantly higher than the other methods(P<0.05);the size of fractal dimension D was consistent with the band within the band,which was G3P3>G2P2>WP>G5P5>G1P1;The physical properties of the soil in the 0-200 cm soil layer are consistent with the in-band soil.The soil physical and chemical properties of G3P3 and Caragana korshinskii forest in the 0-200 cm soil layer of Caragana korshinskii forest are the best;the soil desiccation phenomenon is in the experimental area.It is ubiquitous,and different methods of flattening only affect the degree of soil desiccation within a certain spatial scale.(5)The ratio of evapotranspiration and precipitation in Caragana korshinskii forests was less than 1 in August,indicating that the recharge provided by the entire August rainfall can meet the water consumption of forest evapotranspiration.Most of the other months,the ratio of evapotranspiration to precipitation is greater than 1,so the water supply caused by rainfall can not fully meet the water consumption of forest evapotranspiration.For the whole growth period of Caragana,the ratio of evapotranspiration to precipitation is greater than 1,indicating that the soil moisture consumption in the Caragana forest is slightly greater than the precipitation supply during the whole growing season.This imbalance will result in greater water expenditure.Water income has long caused a serious shortage of soil moisture. |
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