干旱区生态环境知识资源中心

Improving vegetation condition and soil fertility is a major concern for successful rehabilitation in degraded rangelands. This study examines the impact of fencing, water and soil conservation technique (CES) and fodder shrub plantations (Atriplex nummularia) on vegetation cover, phytomass, energy value of phytomass (UF.ha(-1)), pH, organic matter (MO), available phosphorus (P), total limestone (CaT), exchangeable potassium (K), exchangeable sodium (Na) and electrical conductivity (EC) in five different sites. Results show that these techniques can restore the rangeland steppe by inducing a positive dynamics of vegetation and soil. Hence, fencing, CES and Atriplex nummularia trained an accumulation of organic matter in soils and they improved cover, phytomass and energy value of vegetation until 85 %, 2.84 t.ha(-1) and 931 UF.ha(-1) respectively. On the other hand, the free grazing site is marked by a phytomass less than 0.31 t.ha(-1) corresponding to an energy value less than 46 UF.ha(-1) and a global cover less than 6 %. This site is also marked by high levels of exchangeable sodium (Na) and electrical conductivity (CE) with average values of 463.65 mg.kg(-1) and 4,66 mS.cm(-1) respectively.