论文部分内容阅读
以新疆石河子草滩湖湿地作为研究地点,采用化学分析手段,获取该地区4 000 a B.P.以来有机质和总氮TN等数据,并结合孢粉数据,综合探讨古气候变化特征。在500-1 080 a B.P.和2 190-3 800 a B.P.期间,有机质和TN含量较高,此时气候较为湿润,泥炭累积;而在1 080-2 190 a B.P.期间,有机质和TN含量均处于剖面最低值,可能出现一次干旱事件,不利于泥炭堆积。湿地开垦为农田,其有机质和TN含量变化迅速减少,养分大量损失,可见开垦活动是引起湿地退化的原因之一。
Taking the Shihezi Lake wetland wetland in Xinjiang as the study site, the chemical analysis methods were used to obtain the data of organic matter and total nitrogen TN since 4 000 a B.P. in the area, and the palynological data were combined to explore the characteristics of paleoclimate changes. During the period of 500-180 BP and 190-3 800 BPP, the organic matter and TN contents were higher, and the climate was wetter and the peat accumulated. In the period of 1080-2 190 a BP, the contents of organic matter and TN were at The lowest profile, there may be a drought event, is not conducive to peat accumulation. The reclamation of wetlands into farmland resulted in the rapid decrease in the content of organic matter and TN and the significant loss of nutrients. Therefore, reclamation activities are one of the causes of the degradation of wetlands.