| The analysis of circumstance of material fiow of the mixed agri-ecosyst6m is the-.' l important means tO investigate the characteristic of the ecosystem's who]e constrUction .ln thisthesis,in using the method of divide the room model,depend on the natUral' circumstance of YOngHe village,ShuangCheng town,ShuangCheng county inHeilongiiang province, by the means of extrare the room and investigate thecircumstance of material flow, established the model of the liner differential equation setabollt the ecosystCm,and use of the method of LiaPounov's liner theory,demonstrating the stability of the model,and attain the conclusion of that the currentstructUre and the input and outPut of the system are not affected by the varety of the initialvalue.The moSt importan charateriStic of this thesis is that theories analysis of thematerial fiow model and take front line mathematics method to the research ofmaterial flow model.1.Hang the information theories and the research of material flow model to connect,defined the information entropy and the information dischnye of the ecosystem. choicingthe room on the probability that depend on the portion of its outPut in the whole system.Through the ana1ysis of Tedundancy and Ascendancy,deduced the sensitivity of both ofthem to each room. The result of calculation indicatCd that the seeds and soil roomtake the moSt important role in the system;And adusting the construction of the stockraising, changing the quaity of fertilizer in use etc, which can improve the system'scircumStance of materal flow effectvely, and make the ecosystem develop to thewell-ordered cycle.2.First make use of the theory of games in the research of the ecosystem material flowmodeI .Defining the different compartInent as the pIayers in the game,and the various projectof outout as Strategy At the same time, introduce in the conception of the mixed strategy .Thereby Give the definition of utility funCtion of each individual compatment. By the connecting ofthe utility function and the inpllt of information entropy, the whole model become more. integrated* In considndion of the complekity of the ecosystem, ott the three compartmentof the soil, bo crop and livestock as the research objects. ln the paPef, the iterative formulahas been deduced in the game which there are three players. Make use of the MATLABsoftware to compile the calculating program and the result eXPress f in order to guaranee the -Nash equilibrium of the agficu1tUra1 ecos}'Stem, the decision maker shouId choose differentperforming Strategy according to different probability This method not only exPand the theoryanalysis field of the material flowing model, but also provide the decision maker with scientificand reliable decision making foundation.3.One important problem which in the face of the decision maker is the degree of the sustainable development .Be aimed at the problem ,this paper put forward a novel, practical evaluating method .According to the theories of holography biology, there is a high comparability between the physiological system of human-being and the ecosystem. By comparing the blood circulating condition of human physiological system with the material circulating condition of ecosystem, search for the corresponding the conceptions such as the motive and the resistance of material flowing ,the pressure dispatch of circulation. Establish a set of evaluating index which can objectively reflect the condition of material flowing in the ecosystem by use of the mechanism of blood circulation in human body. Transform the parameters in the model, different index value have been obtained corresponding different initial conditions. According to this index, the degree of the sustainable development has been distinguished. This method not only provide the decision maker with important foundation regarding to sustainable development in the choose the development direction, but also could be extended to similar research filed or some smal... |
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