摘要
红柳沙包沉积纹层是恢复古环境序列的一种新方法。通过对罗布泊地区红柳沙包沉积纹层中红柳落叶阳离子含量以及与环境变化关系研究表明:K+、Na+、Ca2+、Mg2+等4种阳离子平均含量分别为3.70 mg/g、40.33 mg/g、13.67 mg/g和8.08 mg/g,变化幅度排序为Ca2+>K+>Mg2+>Na+。4种阳离子含量年际变化都较为明显,且变化规律较为一致,4种阳离子含量变化间的相关系数为0.653 0～0.813 8,表现为良好的正相关关系;各种阳离子与4种阳离子总量变化的相关系数为0.814 4～0.959 9,其中Na+含量与4种阳离子总量变化的相关系数最高,表明可以用Na+含量的变化或阳离子总量的变化分析变化趋势。阳离子含量与气温变化呈良好的正相关、与年降水量和湖水面积变化呈负相关;地下水水位降低、水质变差时,土壤水质也变差,阳离子含量增加;反之,地下水水位升高、水质变好时,土壤水质变好,阳离子含量降低。红柳落叶有机质阳离子含量的变化进一步验证了利用红柳沙包沉积纹层计年的可靠性和对罗布泊环境变化的可行性。
the fallen leaves in sedimentary veins of Tamarix cone and environmental change in Lop Nur region, the researched result has been obtained as follows ： the average positive ion contents of K ＋ , Na ＋ , Ca2 ＋ , and Mg2 ＋ are 3.70 mg/g, 40.33 mg/g,13.67 mg/g and 8.08 mg/g respectively,the order of their change range is Ca2＋ 〉 K＋ 〉 Mg2＋ 〉 Na＋ ; The inter-annual changes of the four kinds of metal element content are more obvious, and the variation trend is more consistent, the correlations between each metal element contents are positive correlations with correlation co- efficient of 0. 653 0 -0. 813 8; The correlation coefficients between the total positive ion content and the each one are 0. 814 4 -0. 959 9 ,the correlation coefficient between Na~ content and the total positive ion content is the high- est, which indicating that Na ~ content or the total positive ion content can reflect the change trends; there are better positive correlation between the content of positive ion and air temperature, and an inverse correlation between the content of positive ion content and annual precipitation and lake water surface area; with the underground water lev- el has been downing, the water quality of underground water has become worse, and the quality of soil water has be- come worse, the content of positive ion has increased; conversely with the underground water level has been going up, the water quality of underground water has become better, and the quality of soil water has become worse, the content of positive ion has decreased. The change of positive ion content in organic materials of Tamarix fallen leav- es has verified the reliability of the dating of sedimentary veins of Tamarix cone, and the feasibility of using sedi- mentary veins of Tamarix cone to reveal the environmental change in Lop Nur region
出处
《干旱区地理》
CSCD
北大核心
2012年第1期109-115,共7页
Arid Land Geography
基金
国家自然科学基金项目(41071133、40671188)
河北省高校重点学科建设项目资助
关键词
罗布泊
红柳沙包
阳离子
环境
Lop Nur
Tamarix cone
positive ion
environment
