Qing Dynasty Jialing River Basin Agricultural Development And Environmental Changes

Man-land relationship has existed since the origins of mankind and objective relationship. Jialing River in Qing Dynasty Status man-land relationship in academic research is a relatively weak link. This paper from the perspective of interaction between agriculture and the environment, seek to recover the face of the Qing Dynasty in Jialing River Valley agricultural development, environmental change series, and to identify changes in agricultural development and the environment inherent relationship between the two.In this paper, and the body by the introduction of four parts. Introduction in the space on the contents of this paper and the time to limit the scope and significance of academic and practical explanation of the origins and significance of thesis topics, reviewed the status of academic research on the topic, clearly this study is the first were carried out based on the results.Order from a body of four chapters. First, from the Jialing River Basin natural geographical and administrative divisions on which the research later in the geographical context and spatial orientation. Second, the retrospective late ming and early 1ing war disasters, natural disasters caused by population loss, then that population recovery is due to short-term flexible rule Qing government policy to Shu, later in the evolution of the agricultural development and environment interaction research foundation. Third, one from the land reclamation, the introduction and cultivation of food crops, irrigation and water conservancy construction of three aspects of agricultural rehabilitation and development of the Jialing River Basin, that reclamation policy, immigration, maize and sweet potato planting in between the introduction and played a decisive role, and the other on the one hand and from the forest down, tiger and other wild animals, atrophy, increase frequency of floods, soil erosion is serious point of discussion in four dramatic changes in the ecological environment, and these changes and too many immigrants, blind uncontrolled land reclamation has directly. Fourth, from agricultural development and environmental evolution in the intrinsic relationship between the two sum up to the full text, that human activity affects the environment to not only change at the same time the environment changes and restricted the activities of human economic development.Through research, Jialing River basin experienced a recession agriculture, rehabilitation, development of three periods in Qing dynasty, accompanied by a surge in population, agricultural development, the gradual deepening of the basin's ecological environment has also undergone tremendous change. Enemies land equilibrium must be established within a certain range, once the critical point of breakthrough, the environment will worsen the negative effects will be greater.