描述:
made for economic prosperity. At the same time, some
man-made natural disasters have been paid more and more attentions , so the research on hydraulic
characteristics of the river in recent years has been put on the agenda. Considering the ecological
environment, flood control, pollution prevention and control method, and in view of the perspective of
the urban landscape as well as the national strategic plan for sustainable development, the research the
hydraulic characteristics of river and making river reasonably repair and ecological reconstruction will
become a general trend, because that is a kind of remediation measure for human to be done
unreasonable exploitation, and it also will be the strong protection of river resources and sustainable
model for better using river resources in the future.
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:
teau the seeding season is cold and little
rainfall. Soil temperature,moisture and fertilizer is an important factor in crop yield. So in this
area dissemination conservation tillage of importance. Most of former researches in
comparison between conservation tillage and conventional tillage. This experimentation
compare with sereval conservation tillage's difference. Through this comparison, wind-water
erosion in the Loess Plateau ecologically fragile areas and application of a reasonable choice
of different measures to provide a reference of farming with a view to achieving the
sustainable and health development of agriculture. In this study, selection of test sites in the
Loess Plateau in northern China typical wind-water erosion area Shenmu, a no-tillage, straw
mulch, plastic film mulching, mulching ridge, ridge of the five kinds of different measures of
conservation tillage experiment, observe ground temperature,soil nutrients,soil moisture,yeild
and soil and water loss.
描述:
y, military and culture in Ming Dynasty。The research on military
farming of the Ming Dynasty played the vital role of leading as to the
research on the outline the history of the Ming Dynasty. The Military
Farming in three states-- He Min and Tao-in Ming Dynasty, as the
epitome of the Ming Dynasty Northwest military Farming, has its
characteristics. He Min and Tao military farming not only has the
common characteristic of that period, but also has its unique distinguishes,
because which is located at the junction of the Han and other ethnic
groups, within the area lived many ethnic minorities. In this paper, the
author analyzes the relevant historical materials and uses theories and
methods of history and ethnology to explain the origin, development,
characteristics of the military farming. And the author discusses the
reasons why they declined in the later years and the impacts in a detailed
and intensive way. Based on local historical dates and combined with the
same period dates, the article analyze mainly the differences among the
three states from its preparation, operation, function and impact aspects
and deal with the military system of the Ming Dynasty, migration,
defense policy, minority administration and policy, economic strategies.
描述:
In history;the central and local separatist all
valued the development of this area. During the Ming and Qing Dynasties,with the renewed
fighting in the northwest, coupled with the rapid growth of the national population, In order to
consolidating border defense and detenting Mainland population pressure,the land development of
this area resumevted,which impacted histoy development of this area very profoundly
Academic research in this area is more included in the academic research for the whole Hexi area
or the entire northwest region, special articles in this area are also mainly concentrated in the lower
reaches of Shiyang River, but these research the upper, middle and lower reaches of the river as a
whole rarely,the connection among the three is.very close essentially.So this object has larger space
to continue researching.
This text includes introduction and body text.the introduction introduces the writing
causes ,implication,and retrospects intellectual history, explains research objectives,Methods and
important and difficult points of this object at the same time.The body text divides into six
chapters.The first chapter analyzes the natural conditions and social infrastructure in this area.The
second chapter mainly deals with immigration status which Ming and Qing government organize
and encourage the population in the mainland move to this area,which provides manpower
resources for agricultural development in this area,and this chapter discusses effectiveness of the
immigration.The third chapter discusses construction of water conservancy which agricultural
development requires,and summarizes pearls and pitfalls of water conservancy construction in
this area during this period.The fourth chapter mainly deals with agricultural development in this
area during the Ming and Qing dynasties,This chapter begin by the reasons for agricultural
development and policies which the government urge and offer for, discusses region of agricultural
development, reclamation success and evolution of tonden in this area during this time.The fifth
chapter mainly discusses environmental problems that because of large-scale development in this
period,and analyzes performance, hazard and measures that local people inoder to protecting the
environment had taken.The sixth chapter summarizes experience and lessons those because of
large-scale development in this period during this time,and explains inspiration for today's
development.
Research of this object is primarily based on literature of the Ming and Qing Dynasties and local
records, and notes data that through field visits get, in order to make the discussion Speci.ficly and
reasonably.