"Mulberry-Dyke-Fish-Pond" And Ancylostomiasis In The Pearl River Delta Since Ming And Qing Dynasties

From Ming and Qing Dynasties to 1970s, "Mulberry-Dyke-Fish-Pond" of the Pearl River Delta is one of the intensive, effective agricultural production modes, and it is the working production of local people adapting to the geographical environment, to the changes of geographical environment. It grows stronger and stronger from the end of Ming Dynasty, attains its peak in 1920s, promotes economy which developed quickly. The development of this production mode is not symmetrical, and be restricted by social economy. "Mulberry-Dyke-Fish-Pond" is controlled by domestic and international market for export of silk before the found of P.R.C. in 1949; and gradually faded after 1949, because of the elevation of productivity, its positive ecosystem circulation has been break, and its benefit falls short for the social requirement. This thesis does not research the efficiency and ecosystem circulation of the production mode from the angle of the economics and ecology, but pays attention to the disadvantageous influence to the farmers' health which developed by this agricultural production mode before 1950s, though it quickly promoted the social economy development at the same time. The production mode and geographical environment which "Mulberry-Dyke-Fish-Pond" existed in are both propitious to the prevalence of ancylostomiasis, so as to the very serious ancylostomiasis in the Pearl River Delta from Ming and Qing Dynasties to 1970s.Chapter One: Introduction Summarizes research basis according to this theme, research state about this field of the thesis, research significance and research method.Chapter Two: Ancylostomiasis in the Pearl River Delta Introduces the harm, symptom, and the hookworm's life span about ancylostomiasis; analyses investigative datas about the prevalence of ancylostomiasis in Guangdong area from the end of Qing Dynasty, concludes that the production mode of "Mulberry-Dyke-Fish-Pond" causes the prevalence of ancylostomiasis.Chapter Three: The development of "Mulberry-Dyke-Fish-Pond" in the Pearl River Delta "Mulberry-Dyke-Fish-Pond" is the outcome of people adapting to nature, changing nature. Its development and contabescence are closely attached to social economy, which would be affected badly by the change of each other.Chapter Four: "Mulberry-Dyke-Fish-Pond" and Ancylostomiasis Colligates Chapter Two and Chapter three, discovers that the development of Ancylostomiasis corresponds with "Mulberry-Dyke-Fish-Pond" 's rise and fall. Firstly, analysises overally the geographical environment of "Mulberry-Dyke-Fish-Pond"( agrotype, solar radiation in the whole year, the hours of sunlight in the whole year, the average temperature of the coldest month and the warmest month, frost period, flood season and withered water period, rainfall quantity, relative humidity, physiognomy), it is not only propitious to the development of "Mulberry-Dyke-Fish-Pond" , but also provides good condition for the existance of hookworm egg. Then analysises the connection of agricultural production mode(the mulberry planting, the harvest method of the mulberry, the field management of the mulberry garden, the method of leaves picking , the prevention and cure against the mulberry diseases and insect pests)and prevalence of ancylostomiasis, cites a great deal of resouces about "Mulberry-Dyke-Fish-Pond" 's agricultural production mode from Ming and Qing Dynasties to 1970s, which including bookmakings, chorographies, agricultural policies, experiences about academic research, about increasing production and foison, investigative reports of ancylostomiasis infection.Chapter Five: Conclusion Summarizes the connection among geographical environment, "Mulberry-Dyke-Fish-Pond", social economy, farmers' health. "Mulberry-Dyke-Fish-Pond" is the outcome of geographical environment and social economy' s combined action, when it is adapt to nature, changes nature, brings benefits to the social economy, it also does harm to the health of the farmers who engaged in the agricultural production mode, causes the prevalence of ancylostomiasis.