本研究依托中国科学院额尔古纳森林草原过渡带生态系统研究站硫添加(0、1、2、5、10、15、20、50 g S·m^(-2)·a^(-1))模拟土壤酸化实验平台,以内蒙古草甸草原禾本科牧草贝加尔针茅和杂类草白头翁2个常见物种为对象,分析了比...本研究依托中国科学院额尔古纳森林草原过渡带生态系统研究站硫添加(0、1、2、5、10、15、20、50 g S·m^(-2)·a^(-1))模拟土壤酸化实验平台,以内蒙古草甸草原禾本科牧草贝加尔针茅和杂类草白头翁2个常见物种为对象,分析了比叶面积、叶干物质含量、叶片厚度、植株高度以及光合色素含量与计量特征的变化,研究草原植物形态性状和光合色素含量对土壤酸化的响应。结果表明:贝加尔针茅主要通过改变形态性状而不是光合色素含量适应土壤酸化。贝加尔针茅和白头翁形态性状对土壤酸化的形态响应基本相似,表现为降低比叶面积(降幅分别为12.0%和8.0%),增加叶干物质含量(增幅分别为3.2%和0.9%)和植株高度(增幅分别为3.4%和15.0%)。贝加尔针茅叶片光合色素含量对土壤酸化无显著响应,而白头翁降低了类胡萝卜素含量(25.7%),但增加了叶绿素与类胡萝卜素的比值(51.4%),这种变化主要受土壤酸化导致的土壤硝态氮和钙镁离子含量下降影响。贝加尔针茅因占据群落上层,拥有获取光资源的优势,主要通过改变形态性状适应土壤酸化。土壤酸化使得白头翁形态性状趋于保守并对光合系统产生了胁迫。展开更多
Purpose:.To compare melanin-related near-infrared fundus autofluorescence (NIA; excitation 787 nm, emission> 800 nm) with lipofuscin-related fundus autofluorescence (FAF; excitation 488 nm, emission > 500 nm) in...Purpose:.To compare melanin-related near-infrared fundus autofluorescence (NIA; excitation 787 nm, emission> 800 nm) with lipofuscin-related fundus autofluorescence (FAF; excitation 488 nm, emission > 500 nm) in patients with idiopathic choroidal neovascularization (ICNV). Methods: FAF, NIA, fundus fluorescein angiography (FFA) and indocyanine green angiography.(ICGA).were obtained using a confocal scanning laser Ophthalmoscope HRA2 (Heidelberg Retina Angiograph 2).in 18 eyes of 18 patients with ICNV. Results:.Eighteen eyes had classic CNV, and autofluorescence imaging showed hypoautofluorescence at the site of CNV..A well-defined hyperautofluorescent ring was detected surrounding the CNV in all 18 eyes with NIA imaging. In our sample,.the FAF patterns around the CNV were classified as normal (n=1,.5.56%), well-defined hyperautofluorescent ring (n=7,.38.89%), or ill-defined hyperautofluorescent ring (n=10, 55.56%). Conclusion:.The patterns of FAF and NIA indicated different involvement of lipofuscin and melanin in the pathophysiological process of ICNV. Compared to FAF imaging, NIA imaging appears to be a superior noninvasive method for in vivo visualization of retinal pigment epithelium (RPE) abnormalities in ICNV patients.展开更多
文摘本研究依托中国科学院额尔古纳森林草原过渡带生态系统研究站硫添加(0、1、2、5、10、15、20、50 g S·m^(-2)·a^(-1))模拟土壤酸化实验平台,以内蒙古草甸草原禾本科牧草贝加尔针茅和杂类草白头翁2个常见物种为对象,分析了比叶面积、叶干物质含量、叶片厚度、植株高度以及光合色素含量与计量特征的变化,研究草原植物形态性状和光合色素含量对土壤酸化的响应。结果表明:贝加尔针茅主要通过改变形态性状而不是光合色素含量适应土壤酸化。贝加尔针茅和白头翁形态性状对土壤酸化的形态响应基本相似,表现为降低比叶面积(降幅分别为12.0%和8.0%),增加叶干物质含量(增幅分别为3.2%和0.9%)和植株高度(增幅分别为3.4%和15.0%)。贝加尔针茅叶片光合色素含量对土壤酸化无显著响应,而白头翁降低了类胡萝卜素含量(25.7%),但增加了叶绿素与类胡萝卜素的比值(51.4%),这种变化主要受土壤酸化导致的土壤硝态氮和钙镁离子含量下降影响。贝加尔针茅因占据群落上层,拥有获取光资源的优势,主要通过改变形态性状适应土壤酸化。土壤酸化使得白头翁形态性状趋于保守并对光合系统产生了胁迫。
基金supported by a grant from the Science and Technology Support Project of Gansu Province(No.090NKCA093)
文摘Purpose:.To compare melanin-related near-infrared fundus autofluorescence (NIA; excitation 787 nm, emission> 800 nm) with lipofuscin-related fundus autofluorescence (FAF; excitation 488 nm, emission > 500 nm) in patients with idiopathic choroidal neovascularization (ICNV). Methods: FAF, NIA, fundus fluorescein angiography (FFA) and indocyanine green angiography.(ICGA).were obtained using a confocal scanning laser Ophthalmoscope HRA2 (Heidelberg Retina Angiograph 2).in 18 eyes of 18 patients with ICNV. Results:.Eighteen eyes had classic CNV, and autofluorescence imaging showed hypoautofluorescence at the site of CNV..A well-defined hyperautofluorescent ring was detected surrounding the CNV in all 18 eyes with NIA imaging. In our sample,.the FAF patterns around the CNV were classified as normal (n=1,.5.56%), well-defined hyperautofluorescent ring (n=7,.38.89%), or ill-defined hyperautofluorescent ring (n=10, 55.56%). Conclusion:.The patterns of FAF and NIA indicated different involvement of lipofuscin and melanin in the pathophysiological process of ICNV. Compared to FAF imaging, NIA imaging appears to be a superior noninvasive method for in vivo visualization of retinal pigment epithelium (RPE) abnormalities in ICNV patients.
