The Effect Of Cut Caragana Shrubland On Runoff And Sediment In Slope Lands

Artificial vegetation in arid ecological sustainability of the function is an important content of ecological protection to restore vegetation can maintain soil effectively,improve the ecological environment,realize the sustainable development in the process of recovery,however,is easy to cause the soil moisture excessive consumption,increase the degree of soil Gan Sao Hua based on experimental station perennial artificial caragana korshinskii huang Lin,different degrees of flat chi intervention,to slow soil water consumption,explore to varying degrees of woodland flat after stubble,caragana korshinskii undergrowth plant change characteristics of soil moisture and its influence to the slope surface runoff and sediment yield,study the following conclusions.(1)After stubble treatment of Caragana korshinskii in the early growth stage,the newly grown Caragana korshinskii has a strong growth capacity during a growth period,and its plant height grows rapidly,which can reach 33% of the normal height of the uncarved stubble;Promote the rejuvenation of Caragana microphylla,the aboveground biomass,height and species richness of understory vegetation have decreased to a certain extent.(2)Flat stubble can effectively slow down the water consumption of Caragana intermedia and reduce the degree of soil desiccation.Throughout the growing season,the soil water content of the wasteland and Caragana intermedia was lower than the wilting coefficient.The soil depth of the wasteland and the plots after two stubble fields was again higher than the wilting coefficient.The depth of the soil layer was about 440 cm.,And the Caragana intermedia stubble is about 520 cm.To a certain extent,it can alleviate the consumption of soil moisture as a whole.Compared with partial flat stubble,all flat stubble can better reduce the consumption of soil water in the 0—200 cm soil layer.(3)Flat stubble can reduce the variability of deep soil moisture.The plots have different soil moisture profiles,and the depth ranges of active soil layer,sub—active layer and relatively stable layer are different.The soil volumetric water content of each depth of the treated Caragana intermedia soil is higher than that of the same depth soil layer of the unstubble forest land;The soil volume water content of the same depth of the soil layer in the unstubble stubble forest,the soil water content showed a "V" —shaped change law with the increase of depth.(4)When the maximum secondary rainfall in the field is 82.5 mm,the amount of rainfall infiltration from different treatments is all flat stubble> abandoned land> partial flat stubble>unflat stubble.The surface runoff of the four plots is very small,respectively 1.2 mm,1.6 mm,3.7 mm and 1.2 mm.The precipitation is almost the sum of the interception of the canopy and the supplementary amount of soil moisture,and the sand content in the different treatment plots is very small.Flat stubble promotes soil water replenishment by reducing the canopy interception of rainfall,and does not affect the water and soil conservation function of Caragana intermedia.(5)Increasing the level of stubble will reduce the initial runoff time on the slope.The runoff rate and accumulated runoff increase with the increase of the level of flat stubble,and the slope after all the flat stubble is obviously higher than that of the partial and unflat stubble.The trends of erosion rate and accumulated sediment yield are similar to those of runoff rate and accumulated runoff.