Research On The Background And Extension Process Of The Introduction Of C. Chinensis From Outside The Territory Of The Tianshui Area In The Mid-20th Century

The introduction and promotion history of sweet clover in Tianshui have reviewed in chronological order,and many factors influencing the introduction and promotion are concerned,which reflected the process of sweet clover value being discovered in China.Based on this understanding,the interaction between environment and society in Tianshui from the Republic of China to the early days of the people's Republic of China was understood.The first period is 1942-1949.Under the double shackles of historical vegetation degradation and the war of the Republic of China,the knowledge interaction between farmers and scientists in the production practice activities have been carried out by the national government concerning.During the Anti Japanese War,the population poured into Tianshui,the local environmental and resource tension have increased.People with unequal resources observed plants in different cognitive paths.Scientists have verified the efficacy of sweet clover in soil conservation and increasing soil fertility through experiments,as one of the measures to control soil erosion and increase agricultural production in Northwest China in wartime.Farmers who were more directly facing the environmental pressure have explored the firewood role of sweet clover based on their own needs.The lack of state capacity means that the knowledge about the use of sweet clover was not extended over a wider area.The results of practical experience and experimentation with sweet clover plants produced knowledge that,after 1949,gained state recognition.Local cadres believed that planting sweet clover was the method to solve environmental problems,such as alleviate poverty,and can increase agricultural production also.The practical experience and scientific experimental results of sweet clover have formed a set of knowledge system.Local cadres believed that sweet clover can solve the problem of three materials shortage,increase labor force of agricultural production.Planting sweet clover has become a specific measure to imply national policies in Tianshui.To some extents,planting sweet clover can alleviate the shortage of firewood in Tianshui,reduce the labor burden of farmers' in long journey,and increase more arable land for agricultural production.Under the policy guidance of self-reliance and realizing the agricultural leap forward,the close combination of mass experience and national strategic goal made the sweet clover continuously emerging new uses and functions,and it has become the‘treasure grass'of the whole country.However,with the intensification of the task of purchasing seeds,local cadres ignored many problems in the cultivation of sweet clover.In this case,the labor consumption of harvesting seeds has increased,and planting sweet clover has failed to achieve the goal of labor saving.On the basis of the historical process of the introduction and promotion of the restoration of sweet clover,this paper breaks through the previous perspective that technology is used as the intermediary role of human land relationship usually,takes the artificially cultivated plants as the media of human land relationship,and pays attention to the development process of human land relationship in Northwest China,and discusses how human beings can transform the environment and expand their own ecological impacts through plants.The history of sweet clover shows that the interweaving of political factors,social relations and knowledge constructs are multiple roles for different plants.These plants become the part of everyday life via different pathways of transmission,and plants with different uses has connected to the land in specific ways.Human has selected plants with certain features and attributed and introduced them into the particular environment.Behind these plants lay systems of knowledge that,with the plants as intermediary,altered land use and remolded the landscape.The introduced plants finally returned to the environment,which made the local environment become the secondary environment after human intervention and provides energy source for human survival.