论文部分内容阅读
昆仑山垭口区小南川剖面和雪水河热水剖面的孢粉分析揭示了该区４４０００ａＢ．Ｐ．以来的植被演替和气候变化。４００００ａＢ．Ｐ．前，推测昆仑山垭口区为典型的灌木荒漠植被，气候极端干燥。４００００－３００００ａＢ．Ｐ．，气候稍有好转。３００００－２４０００ａＢ．Ｐ．为草原荒漠，降水增加。２４０００－１８０００ａＢ．Ｐ．为末次冰期极盛期，气候干冷。１８０００－１３０００ａＢ．Ｐ．气候凉偏干。１３０００－８０００ａＢ．Ｐ．气候凉干。８０００－６０００ａＢ．Ｐ．为全新世温暖期，但由于植被的滞后现象，本区仍为草原荒漠景观。６０００－５０００ａＢ．Ｐ．，本区可能也存在着中全新世的降温事件。５０００－３０００ａＢ．Ｐ．在全新世大暖期的影响下，小南川附近的植被演变成温性草原植被，并有人类的放牧活动。３０００ａＢ．Ｐ．以后，气候变凉，草原迅速地演变为灌木和小乔木荒漠植被，其中３０００－１０００ａＢ．Ｐ．为凉干时期，１０００ａＢ．Ｐ．以后，可能有过一段凉湿时期。
The pollen analysis of the Xiaonanchuan section of the Kunlun Pass area and the hot water section of the Xueshui River reveal 44000aB in this area. P. Since the vegetation succession and climate change. 40000aB. P. Before, it is speculated that Kunlun Mountain Pass area is a typical shrub desert vegetation, the climate is extremely dry. 40000-30000aB. P. The climate is slightly better. 30000-24000aB. P. For grassland deserts, precipitation increases. 24000-18000aB. P. The climax of the last ice age, dry climate. 18000-13000aB. P. Cool and dry climate. 13000-8000aB. P. Dry climate. 8000-6000aB. P. For the warm period of the Holocene, but due to the lag of vegetation, the area is still the grassland desert landscape. 6000-5000aB. P. , The region may also exist in the Holocene cooling events. 5000-3000aB. P. Under the influence of the Holocene Holocene, the vegetation around Xiaonanchuan evolved into temperate steppe vegetation with human grazing activities. 3000aB. P. Later, the climate became cooler and the grasslands rapidly evolved into shrubs and small arbor desert vegetation, of which 3000-1000aB. P. For the dry period, 1000aB. P. After that, there may be a period of cold and wet.