Effects of different fertilization patterns on soil improvement and vegetation restoration of desertified grass-land in northwest Liaoning Province,China
Improving soil fertility is one of the key approaches for ecological restoration of the wind-sand area in northwest Liaoning Province.Taking wind-sand area in northwest Liaoning Province as test object,we conducted a fertilization experiment with treatments of inorganic fertilizer(nitrogen,phosphorus and potassium fertilizers),organic fertilizer,combined application of organic and inorganic fertilizers,and organic fertilizer combined with a biologically organic matrix(γ-polyglutamic acid),and no fertilizer as control.We measured soil organic matter content and extractable cations concentrations,vegetation coverage,and biomass under different fertilization treat-ments and determine the suitable fertilization mode.The results showed that compared to the control,inorganic fer-tilizer rapidly increased vegetation coverage and biomass,but high levels of inorganic fertilizer(150 kg N·hm-2)led to soil acidification and Ca2+leaching.Organic fertilizer increased soil organic matter content,exchangeable K+,Ca2+,and Mg2+contents,as well as coverage and biomass vegetation,especially combined with γ-polyglutamic acid.Overall,the combination of low levels of inorganic fertilizer(50 kg N·hm-2)and moderate levels of organic fertilizer(30000 kg·hm-2)was the best fertilization practice for the rapid and stable restoration of grassland in wind-sand area.Moreover,the extra addition of γ-polyglutamic acid(60 kg·hm-2)could effectively improve soil fertility.
万方数据
维普
