The Observation Of The Ecological Changes The Middle And Lower Reaches Of The Yellow River In Qin And Han Dynasties Period

Surface vegetation changes reflect the situation of ecological environment. Qin and Han Dynasties period in the middle and lower reaches of the Yellow River surface vegetation abatement process, then the ecological environment is a reflection of the changes.Historical period of the residents living in the changing environment plays a very important role. In particular, the size and population density of population size. At that time, this depends very much on the Government’s population policy. Qin and Han Dynasties period to take the immigration of Han Dynasty and the settlement policy of encouraging childbirth at the time of surface vegetation play a role. In particular, immigration settlement, so that the grazing of the grassland turned into cultivated farmland. With the advance and retreat repeatedly dividing line between agriculture and animal husbandry in the middle reaches of the Yellow River , there is a soil erosion and ecological deterioration in the period. In a sense, the war to promote the progress of history , Qin and Han Dynasties period of several expeditions in the promotion of historical progress, but also have a very serious ecological consequences , Huogong in particular the use, the destruction of vegetation on the surface is very large. Qin and Han building of the ruling class and the traditional wooden construction method of extensive use, this is to have a serious impact on the forest. Qin and Han Houzang customs so that the trees have been severely damaged. Only as an example coffin supplies , Han Dynasty period of a year spent at least completely a million mu of trees. Yetie of the Qin and Han Dynasties is located in the middle and lower reaches of Yellow River, Ye Tie is still the Qin and Han charcoal for fuel, the widespread Yetie point on the local vegetation to reduce the surface also has a great responsibility.The ecological consequences by a series of social behaviour of the Qin and Han dynasties Produced a period of ecological deterioration. The performance is the increaseing Disaster of the Yellow River and part of the increase in the emergence of timber crisis. Faced with the crisis, the ruling class enacting a series of modern ecological significance of the Act. Although the Act is based to a large extent a manifestation of benevolent. But in the advocacy Act "shuntianshi," and "Do not commit sishi ban" is the concept of the ecological restoration of the Han Dynasty and re-built to the objective can not be denied the role.