以黄河下游生态脆弱区-济南南部山区为研究对象,基于区域1980~2020年6期土地利用/覆被数据,结合InVEST模型(Integrated Valuation of Ecosystem Services and Trade-offs model),分析区域土地利用/覆被和碳储量的时空分布特征和动态变...以黄河下游生态脆弱区-济南南部山区为研究对象,基于区域1980~2020年6期土地利用/覆被数据,结合InVEST模型(Integrated Valuation of Ecosystem Services and Trade-offs model),分析区域土地利用/覆被和碳储量的时空分布特征和动态变化规律,研究土地利用/覆被变化对陆地生态系统碳储量的影响.结果表明,土地利用/覆被变化对碳储量的影响较为显著,1980~2005年土地利用变化较小,人类活动影响较小,由于林草地碳储量的累积,碳储量增长速度明显高于其他时期;2005~2010年城市扩张速度最快,城乡建设用地大量侵占耕地、林地和草地,使区域固碳能力明显下降;2010~2020年,由于城市化扩张限制以及植树造林等生态保护措施的实施,区域碳储量逐渐呈增长趋势;1980~2020年济南南部山区的总碳储量呈“增长-下降-增长”的趋势;并且林地是济南南部山区碳储量的主要供给者,区域碳储量值随着远离城乡居民生活中心的距离增大而增大,说明人类活动对区域碳储量有重要的影响.另外,土地利用类型的转移引起地类碳密度的变化,是区域碳储量变化的主要影响因素,土地利用类型的碳储量变化与各地类的面积变化有一定的关系.该成果可为生态脆弱区塑造良好的陆地碳汇格局提供理论依据.展开更多
目的研究西南红山茶花的化学成分。方法采用硅胶柱色谱法、Sephadex LH-20柱色谱等方法进行分离纯化,根据波谱学数据和理化性质进行结构鉴定。结果从西南红山茶花95%乙醇提取物的醋酸乙酯萃取物中分离鉴定了10个化合物,分别为槲皮素(que...目的研究西南红山茶花的化学成分。方法采用硅胶柱色谱法、Sephadex LH-20柱色谱等方法进行分离纯化,根据波谱学数据和理化性质进行结构鉴定。结果从西南红山茶花95%乙醇提取物的醋酸乙酯萃取物中分离鉴定了10个化合物,分别为槲皮素(quercetin,Ⅰ)、芦丁(rutin,Ⅱ)、山萘酚(kaempferol,Ⅲ)、山萘酚-3-O-α-L-鼠李糖苷(kaempferol-3-O-α-L-rhamnoside,Ⅳ)、山萘酚-3-O-β-D-葡萄糖苷(kaempferol-3-O-β-D-glucopyrano-side,Ⅴ)、没食子酸(gallic ac id,Ⅵ)、(-)-表儿茶素[(-)-ep icatich in,Ⅶ]、齐墩果酸(oleanolic ac id,Ⅷ)、β-谷甾醇(β-sitosterol,Ⅸ)、胡萝卜苷(daucosterol,Ⅹ)。结论化合物Ⅰ～Ⅹ均首次从西南红山茶花中分离得到。展开更多
[Objective] The aim of this study was to investigate the effects of salt stress on cell expansion in Arabidopsis thaliana rosette leaves.[Method] Arabidopsis seedlings were treated by sodium chloride at the concentrat...[Objective] The aim of this study was to investigate the effects of salt stress on cell expansion in Arabidopsis thaliana rosette leaves.[Method] Arabidopsis seedlings were treated by sodium chloride at the concentration of 0,100 or 150 mmol/L. At the 7th and 14th d of treatment,with nail enamel printing mark method and computer software,the leaf blades area and abaxial epidermal pavement cells area was measured and compared using statistical analysis in Excel. [Result] The growth of Arabidopsis rosette leaves was inhibited under salt stress. Leaves treated for 7 or 14 d expanded less compared with controls. The salt-mediated decrease in leaf expansion is associated with a decrease in abaxial pavement cell expansion. [Conclusion] The decreased leaf and epidermal cell expansion under salt stress is the most important characteristic of plant physiological response to salt stress.展开更多
文摘以黄河下游生态脆弱区-济南南部山区为研究对象,基于区域1980~2020年6期土地利用/覆被数据,结合InVEST模型(Integrated Valuation of Ecosystem Services and Trade-offs model),分析区域土地利用/覆被和碳储量的时空分布特征和动态变化规律,研究土地利用/覆被变化对陆地生态系统碳储量的影响.结果表明,土地利用/覆被变化对碳储量的影响较为显著,1980~2005年土地利用变化较小,人类活动影响较小,由于林草地碳储量的累积,碳储量增长速度明显高于其他时期;2005~2010年城市扩张速度最快,城乡建设用地大量侵占耕地、林地和草地,使区域固碳能力明显下降;2010~2020年,由于城市化扩张限制以及植树造林等生态保护措施的实施,区域碳储量逐渐呈增长趋势;1980~2020年济南南部山区的总碳储量呈“增长-下降-增长”的趋势;并且林地是济南南部山区碳储量的主要供给者,区域碳储量值随着远离城乡居民生活中心的距离增大而增大,说明人类活动对区域碳储量有重要的影响.另外,土地利用类型的转移引起地类碳密度的变化,是区域碳储量变化的主要影响因素,土地利用类型的碳储量变化与各地类的面积变化有一定的关系.该成果可为生态脆弱区塑造良好的陆地碳汇格局提供理论依据.
文摘目的研究西南红山茶花的化学成分。方法采用硅胶柱色谱法、Sephadex LH-20柱色谱等方法进行分离纯化,根据波谱学数据和理化性质进行结构鉴定。结果从西南红山茶花95%乙醇提取物的醋酸乙酯萃取物中分离鉴定了10个化合物,分别为槲皮素(quercetin,Ⅰ)、芦丁(rutin,Ⅱ)、山萘酚(kaempferol,Ⅲ)、山萘酚-3-O-α-L-鼠李糖苷(kaempferol-3-O-α-L-rhamnoside,Ⅳ)、山萘酚-3-O-β-D-葡萄糖苷(kaempferol-3-O-β-D-glucopyrano-side,Ⅴ)、没食子酸(gallic ac id,Ⅵ)、(-)-表儿茶素[(-)-ep icatich in,Ⅶ]、齐墩果酸(oleanolic ac id,Ⅷ)、β-谷甾醇(β-sitosterol,Ⅸ)、胡萝卜苷(daucosterol,Ⅹ)。结论化合物Ⅰ～Ⅹ均首次从西南红山茶花中分离得到。
文摘[Objective] The aim of this study was to investigate the effects of salt stress on cell expansion in Arabidopsis thaliana rosette leaves.[Method] Arabidopsis seedlings were treated by sodium chloride at the concentration of 0,100 or 150 mmol/L. At the 7th and 14th d of treatment,with nail enamel printing mark method and computer software,the leaf blades area and abaxial epidermal pavement cells area was measured and compared using statistical analysis in Excel. [Result] The growth of Arabidopsis rosette leaves was inhibited under salt stress. Leaves treated for 7 or 14 d expanded less compared with controls. The salt-mediated decrease in leaf expansion is associated with a decrease in abaxial pavement cell expansion. [Conclusion] The decreased leaf and epidermal cell expansion under salt stress is the most important characteristic of plant physiological response to salt stress.
