黄土丘陵半干旱区不同类型植被水保生态效益研究

Soil and Water Conservation Function and Ecology Benefits of Different Types Vegetation in Semi arid Loess Hilly Region

通过研究表明 ,不同类型植被减少径流和泥沙的功效不同 ,东坡不同类型植被小区径流深由大到小的顺序为 :荒坡 >沙棘 (平茬 ) >沙棘 +小叶杨 >农地 ,北坡为油松 >油松 +沙棘 >沙棘林 ;东坡产沙量由大到小的顺序为农地 >荒坡 >沙棘 (平茬 ) >沙棘 +小叶杨 ,北坡为油松 >油松 +沙棘 >沙棘。不同类型植被在生长季的土壤水分平均值均很低 ,其变化范围在6 .33%～ 9.6 0 % ;

The research results have showed that the efficacy of vegetation decreasing runoff and sediment is different with its types. The depth of runoff in different types vegetation plots on eastern slope from large to little is barren slope > seabuckthorn stand (seabuckthorn is cut)> seabuckthorn +leaflet poplar stand > farmland. Sediment discharge from large to little on eastern slope is farmland >barren slope >seabuckthorn stand (seabuckthorn is cut) >seabuckthorn +leaflet poplar stand, and on northern slope is pine plantation>pine+seabuckthorn stands>seabuckthorn. Mean values of soil moisture in different types vegetation plots in the growing season are very low, they have ranged from 6.33% to 9.60%. There is dry layer formed by the plants absorbing water in seabuckthorn plantation.