描述:
th, the demand of water resource is
continuously increasing. That is to say water shortage has become a global problem. Water
resources carrying capacity is the basis and prerequisite of regional socio-economic development,
which is significant to realize the coordinated development of regional "water resources-
ecological environment-socio-economy" composite system. So it has become the focus and hot
topic in water science field nowdays.
描述:
th, the demand of water resource is
continuously increasing. That is to say water shortage has become a global problem. Water
resources carrying capacity is the basis and prerequisite of regional socio-economic development,
which is significant to realize the coordinated development of regional "water resources-
ecological environment-socio-economy" composite system. So it has become the focus and hot
topic in water science field nowdays.
描述:
be given when fully and rational use of local
climatic resources such as solar radiation, heat and water, while other conditions (such as soil
fertility, carbon dioxide concentration, cultivation level etc.)
描述:
ral environments make the
cultural dissemination possible. In archeological materials we can see plenty of
Neolithic culture and Bronze culture,which may be nomads. Ywati, Wusun, Hun were
lived here.Befor Han Dynastie ,the area was regarded as wild and woolly place.the
Hun sprang up during Qin and Han Dynastie, Gansu Corridor became more and more
imporant in military and politics affairs. After the establish of Western Han
Dynasty ,the imperium rehabilitated for tens of years . Emperor han wudi change the
plant to the Hun. I
n
the second year of yuanshou of Emperor han
wudi(121BC),Huoqubing go on an expedition to Gansu Corridor,and wan,because the
Hunye king killed the Xiutu king . The Hunye king surrenderred and leaded his man
about 40000 .This is significant to the history of culture diaaemination. From then
on,Han culture hold the dominant position in the war.The pattern of dissemination
were war,politics and valueas.And the policy which Han made decision of the
dissemination and the speed. After long time Interaction,the two change the hisroy of
this area.Although some rejection and degradation happened,the new trail was
certainty.
Agricultural civilization took new tools to the area,and finally the Silk Road was
freely.It made a contribution to culture dissemination.However,the aggressive
e x p a n s i o n m a d e t h e immigrate and armies too huge,and led the crisis of
ecologyand resource. Qiang civilians uprising during the Eastern Han Dynastie made
the land desertificated.
The process was not at one stroke,but a long time. Rely on force was to set up a
unified ,multinational country.
描述:
ncentrated v}}ith 85% of the
total dry lands. and it is important for the national economy and the countr<0's strategic
agricultural growth. Northwest arid areas basically depend on natural precipitation. water
shortage has seriously affected the farmers practices. The decision of farmers to plant dry
land is a two-stage decision-making behavior: They first have to decide whether to plant
dry land, and then decide what kind of crops planted in the dry lands. It is essential to find
effective ways to raise the enthusiasm of farmers planting and reasonable arrangements for
dry land crop structure. However. ver}} few people study dry land farming practice from the
perspective of water shortages.
描述:
stics of the basic
conditions for the development of agricultural industry in Jiuquan City and, the
situation of and constraints in the development of featured agricultural industry,
aiming at seeking an approach to futher develop the featured agricultural industry in
the city of Jiuquan.