内蒙古萨拉乌苏河米浪沟湾MIS 5以来生态环境演变特征  

The characteristics of ecological environment change for the Milanggouwan section since MIS 5 in the Salawusu catchment,Inner Mongolia

作　　者：樊荣[1] 赵琦[1] 李保生[2] 温小浩[2] 牛东风[2] Steffen Mischke 张成君[4] 

机构地区：[1]兰州大学资源环境学院环境科学与工程研究所,兰州730000 [2]华南师范大学地理科学学院,广州510631 [3]Institute of Earth and Environmental Science,University of Potsdam [4]兰州大学地球科学与矿产资源学院,兰州730000

出　　处：《干旱区资源与环境》2015年第1期169-174,共6页Journal of Arid Land Resources and Environment

基　　金：国家自然科学基金面上项目(41173015);教育部博士点基金(20100211110020)资助

摘　　要：通过对毛乌素沙漠南缘萨拉乌苏河流域米浪沟湾地层中有机质含量(TOC)和饱和烃分布特征,以及沉积物中碳酸盐碳氧同位素组成的分析,讨论了该地区末次间冰期以来生态环境的演变特征和过程。MIS5阶段为森林草原环境,气候比较湿润,河流径流量较大;MIS4和MIS2阶段气候干冷,以沙漠堆积为主,但MIS2在16.9-18.4kaBP期间有一次持续大约1.5ka的古环境适宜时期,森林草原发育;MIS3阶段气候温暖湿润,森林草原环境,湖泊发育;全新世早中期总体上向干旱方向发展,湖泊动荡短暂,为较少森林的草原环境。到晚全新世以沙漠沉积为主,成为与目前生态环境相似的干草原环境。该地区的生态环境演变特征反映出主要受冬夏季风变化控制,但如果西风环流加强时期植被也相对发育。Organic matter content（ TOC） and n- alkane distributions,carbon and oxygen isotopic compositions of carbonate from the Milanggouwan section,which locates in mid part of the Salawusu River in the south boundary of Mus desert,had been analyzed for discussing and reconstructing the paleoecological environmental change since MIS5. The results showed that it was forest- grassland and warm- wet condition with amounts of runoff in the Salawusu river during the MIS5 stage. Desert enlarged in the stages of MIS4 and MIS2 under the dry and cold condition. There was an optimum period with blooming grassland and forest between 16. 9 to 18. 4kaBP in the MIS2 stage. Climate was forest- grassland ecological environment under the warm and wet condition in the MIS3 stage,and lake enlarged during this period. The ecological characteristic was grassland with few forest and temporary lake developing under dry paleoclimate to the mid- Holocene. Next,till to late Holocene,Salawusu area became to desert and dry grassland as modern environment in the Mu us Desert. The ecological environment change in this area was controlled by the winter and summer monsoon,but vegetation bloomed much more under westerly strengthening.

关 键 词：米浪沟湾 末次间冰期 TOC 饱和烃 碳酸盐碳氧同位素组成 

分 类 号：S812[农业科学—草业科学]