共查询到20条相似文献,搜索用时 15 毫秒
1.
2.
3.
4.
5.
Nelson Rosenbaum 《政策研究杂志》1980,8(4):575-596
6.
An analysis of evaporation changes in the Central Asian plain in connection with the drop of the Aral Sea level beginning in 1961 shows that there has been a reduction in evaporation from stream valleys and deltas and an increase in evaporation from irrigated land and newly formed evaporating surfaces. These new entities are primarily the Arnasay depression (west of the Golodnaya Steppe irrigation district) and the Sarykamysh depression (west of the lower reaches of the Amudarya), which have become filled with spent irrigation water draining from the irrigated land. Another new source of evaporation associated with human activity are the lakes and wetlands formed along the Kara Kum Canal as a result of the filtration of canal water. It turns out, furthermore, that irrigation on sloping piedomon plains, such as those watered by the Kara Kum Canal, requires more water than in old irrigated alluvial plains because of the additional water needed to flush salt out of the soil and to fill subsoil cavities and raise the watertable. 相似文献
7.
CHRISTOPHER EVANS 《Oxford Journal of Archaeology》1989,8(2):179-201
Summary. Archaeology has long operated from the premise that there was a diverse and ornate organic 'clothing' on the 'dry skeleton' of the past which evades excavation. This paper evaluates the evidence from recent wetlands excavations and considers the implications of the paucity of organic containers found, and the lack of decoration on recovered organic materials, in Britain. It is argued that this negative evidence has important ramifications for our understanding of production and the classification of 'things' in later prehistoric societies. These issues can obviously not be addressed without considering the wealth of organic artifacts recovered at Glastonbury and an extended discussion of its material culture assemblage is included. In conclusion it is stressed that by its relative invisibility 'organic archaeology' has been prone to our normative projections onto the past. The role played by organic goods cannot be understood as being constant and can only be appreciated within their broader archaeological context. 相似文献
8.
9.
《中国西藏(英文版)》2000,(4)
Flowers blossom amid the green grass, with leaves irrigated by dew and roots scented by butter." This best describes what awaits the visitor to Garze Tibet Ethnic Group Autonomous Prefecture, Sichuan Province.Garze, covering 153,001.91 square km, was the first autonomous prefecture ever established in China. It exercises jurisdiction over 18 counties, with a population of 880,000, some 75.68 of them being Tibetan and the remainder Han, Yi, Hui, Qiang and Naxi. In this special issue, we i… 相似文献
10.
11.
12.
出国采访并不如大多数人想像的那样,是自由、惬意又有人买单的超完美旅行,其辛苦不为人知。即便这样,我们仍然将美好的片段向你呈现。并推荐几个采访者喜欢的东西和地方。 相似文献
13.
14.
《中国西藏(英文版)》2018,(6)
正In June 2018, China's Tibet organized a group of journalists to travel to several counties within Chamdo,including such places as the city of Chamdo itself and the counties of Jomda, Gonjo, and Markham, and it was in these places that they were to conduct interviews with the local people.Despite advanced technology and convenient transportation becoming introduced to the region, Tibet is still an unknown land of mystery to many around the world.The geography of Tibet certainly does a lot to 相似文献
15.
16.
17.
18.
19.