[Objective] The aim was to study seasonal dynamics of biomass under different land use patterns. [Methed] Aboveground biomass and underground biomass of plants under 3 different surface cover conditions of Stipa krylo...[Objective] The aim was to study seasonal dynamics of biomass under different land use patterns. [Methed] Aboveground biomass and underground biomass of plants under 3 different surface cover conditions of Stipa krylovii, Leymus chinensis and farmland were determined in growing season ( from May to October) of 2008. [ Result ] The aboveground biomass of Stipa krylovii, Leymus chinensis and farmland in August all reached the highest value, which of Stipa krylovii, Leymus chinensis and farmland was 287.91,117.05 and 193.59 g/m2, respectively. The total biomass of plant roots of the 3 plots in July all reached the highest value, which of Stipa krylovii, Leymus chinensis and farmland was 1 683.9, 1 601.9 and 513.9 g/m2, respectively. Leymus chinensis had the biggest biomass ratio of upper plant roots (0 - 15 cm) to lower plant roots (15 -30 cm), Stipa krylovii took second place, and farmland had the smallest one. ~ Conclusion The research provides theoretical basis for the ecological environment protection of ecological fragile area.展开更多
骨坏死(Osteonecrosis,0N)又称无菌性坏死、无血管性坏死或缺血性坏死,指由于各种原因(机械、生物等)使骨循环中断、骨的活性成分死亡及随后修复的一系列复杂的病理过程。骨坏死可累及全身许多关节,其中以股骨头缺血性坏死(Osteone...骨坏死(Osteonecrosis,0N)又称无菌性坏死、无血管性坏死或缺血性坏死,指由于各种原因(机械、生物等)使骨循环中断、骨的活性成分死亡及随后修复的一系列复杂的病理过程。骨坏死可累及全身许多关节,其中以股骨头缺血性坏死(Osteonecrosis of the Femoral Head,ONFH)最常见。展开更多
基金Supported by National Natural Science Foundation ( 30590384,30900197)~~
文摘[Objective] The aim was to study seasonal dynamics of biomass under different land use patterns. [Methed] Aboveground biomass and underground biomass of plants under 3 different surface cover conditions of Stipa krylovii, Leymus chinensis and farmland were determined in growing season ( from May to October) of 2008. [ Result ] The aboveground biomass of Stipa krylovii, Leymus chinensis and farmland in August all reached the highest value, which of Stipa krylovii, Leymus chinensis and farmland was 287.91,117.05 and 193.59 g/m2, respectively. The total biomass of plant roots of the 3 plots in July all reached the highest value, which of Stipa krylovii, Leymus chinensis and farmland was 1 683.9, 1 601.9 and 513.9 g/m2, respectively. Leymus chinensis had the biggest biomass ratio of upper plant roots (0 - 15 cm) to lower plant roots (15 -30 cm), Stipa krylovii took second place, and farmland had the smallest one. ~ Conclusion The research provides theoretical basis for the ecological environment protection of ecological fragile area.
文摘骨坏死(Osteonecrosis,0N)又称无菌性坏死、无血管性坏死或缺血性坏死,指由于各种原因(机械、生物等)使骨循环中断、骨的活性成分死亡及随后修复的一系列复杂的病理过程。骨坏死可累及全身许多关节,其中以股骨头缺血性坏死(Osteonecrosis of the Femoral Head,ONFH)最常见。