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:
ainly chooses three aspects, the quantity and quality
of farmland, the land system and agricultural technology, to analysis the fact that the land system,
the land utilization patterns and the selection of agricultural technology are constrained by natural
environment and land resources, accordingly reveal the main-land relationship which is influenced
by natural environment. The thesis is composed of four parts.
描述:
ainly chooses three aspects, the quantity and quality
of farmland, the land system and agricultural technology, to analysis the fact that the land system,
the land utilization patterns and the selection of agricultural technology are constrained by natural
environment and land resources, accordingly reveal the main-land relationship which is influenced
by natural environment. The thesis is composed of four parts.
描述:
iculture,
farmer and countryside problems, is always the core work of party and state, But
with the development of modern technology revolution and economic
globalization, economy, technology and talents resource are flowing to the city,
villages are relatively in high marginalized situation, the agriculture develop
difficult and the peasants' income grow slowly.
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.