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THE COMPARISON OF LANZHOU LOESS PROFILE WITH VOSTOK ICE CORE IN ANTARCTICA OVER THE LAST GLACIATION CYCLE 总被引:4,自引:0,他引:4
Loess near Lanzhou in the late Pleistocene is very sensitive to climatic fluctuations. The Beiyuan terrace profile in Linxia City, of which the curve of susceptibility tallies with the trend of isotopic curves of Vostok 2083 m ice core in Antarctica, is 35m thick. There are five layers of paleosols under Malan loess(L_1). Upper three layers (S_(1-a),S(1-b)and S_(1-c) correspond to three warm stages in last interglaciation, Interstadial of Last Glacial (C stage in Antarctic ice core)was clearly recorded in the Beiyuan profile, in which three layers of paleosols and two of loess were formed. The lowest section of the profile belongs to penultimate glaciation, in which fossils of cold-drought-resistant mammal and mollusc have been discovered. 相似文献
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基于现场光谱的翅碱蓬生物量遥感反演方法研究 总被引:2,自引:0,他引:2
利用便携式地物光谱仪和植被冠层分析仪测定辽东湾双台河口盐沼植被翅碱蓬的光谱数据和叶面积指数(LAI),建立翅碱蓬光谱反射率曲线;探讨翅碱蓬的植被指数与叶面积指数和生物量的相关关系,得到以下结论:(1)9月底翅碱蓬在630nm红光波长出现明显的反射峰值,反射率达到了12%~15%,在680~700nm,有明显的"红谷"形态,在760nm左右有明显的"红边",反射率达到25%~30%。(2)翅碱蓬植被指数及叶面积指数的回归分析中,SAVI和MSAVI指数与LAI的相关关系较其他指数好,最高的R2值达到0.711。对比不同指数的Linear回归方程发现,SAVI和MSAVI指数与LAI的相关关系R2值达到0.696,0.695;其次为RVI值0.664,NDVI值0.649及PVI值0.466。(3)翅碱蓬生物量(Biomass)与PVI,SAVI和MSAVI的相关系数R2较高,直线回归方程相关系数分别达到0.626,0.698和0.679;对数方程相关系数为0.592,0.706和0.683;二次方程相关系数分别为0.688,0.711和0.683。 相似文献
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