Graphic correlation method has been proved to be very useful in correlating sections in different places. In this study, we have selected five sections from the Western Interior Basin, USA and applied graphic correlat...Graphic correlation method has been proved to be very useful in correlating sections in different places. In this study, we have selected five sections from the Western Interior Basin, USA and applied graphic correlation method to correlate them. The selected five sections are located from the eastern to the western margins of the Western Interior Basin, USA. The cross-basinal high-precision chronostratigraphic correlation provides geologists a better understanding about how facies and depositional environments evolved across the mid-Cretaceous Western Interior Basin during the mid-Cretaceous. In addition, our data fits well with the previous understandings about mid- Cretaceous Western Interior Seaway, which characterized by slow depositional rates and higher organic matter concentration.展开更多
利用CASA模型(Carnegie-Ames-Stanford Approach)模拟石羊河流域2000—2020年植被净初级生产力(NPP),分析流域NPP的时空变化特征、稳定性和未来变化趋势,并从气候因素、地形因素和人类活动因素3个方面探讨对NPP的变化影响。结果表明:(1)...利用CASA模型(Carnegie-Ames-Stanford Approach)模拟石羊河流域2000—2020年植被净初级生产力(NPP),分析流域NPP的时空变化特征、稳定性和未来变化趋势,并从气候因素、地形因素和人类活动因素3个方面探讨对NPP的变化影响。结果表明:(1)2000—2020年石羊河流域植被NPP多年平均值为291.01 g C·m^(-2)·a^(-1),呈不显著增加趋势,空间分布呈南高北低的分布格局。(2)2000年以来植被NPP呈增加趋势的区域占总面积的86.4%,其中极显著增加和显著增加的区域分别占6.7%和10.1%。(3)NPP变化在中等波动以上(变异系数Cv≥0.25)的区域所占比例为50.4%。(4)从未来变化趋势看,石羊河流域植被NPP恢复的持续性较弱,呈增加并反持续的地区所占比例达到57.1%。(5)流域的植被NPP变化与气温、降水均成正相关,对气温的响应更为敏感。NPP随海拔高度和坡度增加呈现增大后减小趋势,近年来流域实施的一系列人工造林、退耕还林还草等措施对植被NPP的增加具有明显促进作用。展开更多
文摘Graphic correlation method has been proved to be very useful in correlating sections in different places. In this study, we have selected five sections from the Western Interior Basin, USA and applied graphic correlation method to correlate them. The selected five sections are located from the eastern to the western margins of the Western Interior Basin, USA. The cross-basinal high-precision chronostratigraphic correlation provides geologists a better understanding about how facies and depositional environments evolved across the mid-Cretaceous Western Interior Basin during the mid-Cretaceous. In addition, our data fits well with the previous understandings about mid- Cretaceous Western Interior Seaway, which characterized by slow depositional rates and higher organic matter concentration.
文摘利用CASA模型(Carnegie-Ames-Stanford Approach)模拟石羊河流域2000—2020年植被净初级生产力(NPP),分析流域NPP的时空变化特征、稳定性和未来变化趋势,并从气候因素、地形因素和人类活动因素3个方面探讨对NPP的变化影响。结果表明:(1)2000—2020年石羊河流域植被NPP多年平均值为291.01 g C·m^(-2)·a^(-1),呈不显著增加趋势,空间分布呈南高北低的分布格局。(2)2000年以来植被NPP呈增加趋势的区域占总面积的86.4%,其中极显著增加和显著增加的区域分别占6.7%和10.1%。(3)NPP变化在中等波动以上(变异系数Cv≥0.25)的区域所占比例为50.4%。(4)从未来变化趋势看,石羊河流域植被NPP恢复的持续性较弱,呈增加并反持续的地区所占比例达到57.1%。(5)流域的植被NPP变化与气温、降水均成正相关,对气温的响应更为敏感。NPP随海拔高度和坡度增加呈现增大后减小趋势,近年来流域实施的一系列人工造林、退耕还林还草等措施对植被NPP的增加具有明显促进作用。
