描述:
ium between the grain production
and water resource: the drought and the irrigation area in northeast china, the drought and the
irrigation region in Huanghuaihai area, the drought and the irrigation area in northwest
china.The article analized the characteristic of water using of the main crops and the main
cropping systems, compared the economic benefit of the water-saving planting patterns,
studied the economic benefit, the water-saving benefit and participatory farmers survey
results etc. of the water-saving technologies.
描述:
as formed a series of
mufti-value connected with productive function gradually during the process of
`living',and it has affected the development of China deeply.
描述:
and trends,
these new situation on the traditional family ethics raised new challenges in the
traditional Confucian family ethics formed a huge impact.
描述:
eat attention to adopting
various techniques to improve soil quality when plowing the soil, so that the soil could keep
sustainable fertility and high rate of yield.
描述:
f the earth's
surface.Therefore,it has great benefit for clarifying the mutual action between human
beings and land and their change principles in the historical period when the land use
and the land cover changes are chosen as the study perspective.
描述:
f the
Qingzang plateau.Gannan is adjacent to Qinghai province in west,to Sichuan province
in south,to the southern of Gansu province in east and to the Loess plateau in
north.Mountainous country and plateau are its major landforms types.It is a highest