摘要
对尼洋河流域5个不同植被带下18个表土样品的孢粉分析结果显示:不同植被带下表土花粉组合差异显著,表土花粉组合与现代植被带在空间分布、建群种和优势种属方面基本一致,两者对应结果分别为:高山草甸为莎草科组合带;亚高山灌丛为沙棘属-蒿属组合带;高山栎林为栎属-蔷薇科-蒿属组合带;高山松林为松属组合带;针阔混交林为松属-冷杉属-蒿属组合带。年均降水量(MAP)是影响尼洋河流域表土孢粉组合的重要因素。草本、乔木花粉百分含量与研究区MAP值呈显著相关,草本花粉的百分含量与MAP值呈明显负相关,而乔木花粉则相反。研究区孢子和花粉浓度不一定随MAP增加而显著增加。
In order to investigate the relationship between the surface pollen and mean annual precipitation, surface soil samples collected from 18 sites in different vegetation zones in the Niyang River Basin were analyzed. The results of pollen assemblages of surface soil samples generally show that pollen group agree with the whole main plant types of the modern vegetation. And they are basically similar in the spatial arrangement, types and the main and dominant genera. The two corresponding results show that the alpine meadow corresponds to Cyperaceae assemblage zone; Subalpine shrub corresponds to Hippophae-Artemis- ia assemblage zone; Quercus aqui folioides forest corresponds to Quercus-Rosaceae-Arternisia assemblage zone; Pinus densata forest corresponds to Pinus assemblage zone; the coniferous and broad-leaved mixed forest corresponds to Pinus^Abies-Artemis- ia assemblage zone. In addition, the herb and arboreal pollen percentages are significantly related to MAP, and the former has a negative correlation,the latter has a positive correlative with MAP. It is need to mention that pollen concentration has a poor correlation with MAP in Niyang River Basin.
出处
《地理与地理信息科学》
CSCD
北大核心
2013年第1期80-85,共6页
Geography and Geo-Information Science
基金
国家自然科学基金项目(41002058
41172332)
中国科学院青藏高原环境变化与地表过程重点实验室开放基金
