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中国东南沿海至黄土高原北缘表土长链正构烷烃CPI值随着纬度增加逐渐升高,CPI值与湿度和降水量分别具有较好的线性负相关关系,而与温度的负相关较弱.武夷山、神农架和天山表土CPI值随着海拔升高(温度降低)没有表现出明显的规律,但从湿润区到干旱区,每座山的平均CPI值依次增大.这些结果表明,表土长链正构烷烃CPI值受控于气候干湿状况,高CPI值可以指示干旱气候.表土长链正构烷烃主要来自植物叶蜡,但表土CPI的这种纬向变化不是植被变化引起的,而很可能是在湿润气候下,微生物活动加强,微生物来源的长链正构烷烃和/或微生物的降解作用导致了表土CPI值降低.
The CPI of long-chain n-alkanes from the southeast coast to the north of Loess Plateau increased gradually with the increase of latitude. The CPI values had a good linear negative correlation with humidity and precipitation respectively, but negative correlation with temperature. The CPI values of topsoil in Wuyishan, Shennongjia and Tianshan showed no obvious regularity with the increase of elevation (temperature decrease), but from the humid area to the arid area, the average CPI value of each mountain increased in turn.These results showed that the topsoil long chain The CPI value of n-alkanes is controlled by the dry and wet conditions of the climate, and the high CPI values can indicate the arid climate. The long-chain n-alkanes in the topsoil mainly come from the leaf wax of the plant, but the zonal change of topsoil CPI is not caused by vegetation changes. It is possible that in humid climate, the activity of microorganisms is strengthened and the degradation of long-chain n-alkanes and / or microorganisms originating from microorganisms leads to the decrease of top soil CPI.