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Study On The Evaluation Of Agricultural Water Resources Of Sichuan Hilly Areas

Posted on:2006-11-26Degree:MasterType:Thesis
Country:ChinaCandidate:X Z YaoFull Text:PDF
GTID:2179360155470589Subject:Soil science
Abstract/Summary:PDF Full Text Request
The sustainable utilization of water resources was one of the cores of the sustainable utilization of nature resources. As an important part of water resources, the utilization of agriculture water resources was sustainable or not, which would have a great influence on the sustainable development of area economy. So it was very important to set up available models to evaluate region agriculture water resources, probed the index system to evaluating agriculture water resources, and evaluated the agriculture water resources logically and accurately. It was not the necessary of agriculture itself, but also the requirement of efficiently utilizing agriculture water resources. Now the researches of evaluating agriculture water resources had received more mature and perfect development, which focused on the sustainable utilization of agriculture water resources. But as far as Sichuan province was concerned, at the scale of county, it was short of researches of evaluating agriculture water resources. Therefore, from the macroscopic point of view, the paper draws up to valuate the equilibrium of supply and demand in 68 counties of Sichuan hill areas, and offers the theory foundation for the sustainable utilization of agriculture water resources. Referring to the information collected from the pertinent departments, this research estimates the agricultural water resources in 68 counties of Sichuan hilly areas. Based these, on the principles of localization, a appropriate number of indexes, ease of quantization, the combination of science, entirety and independence, the combination of system and layering, using frequency statistical method, expert consultation and index filtering, according to the actual situation and practical data of the hilly areas, it completed the equilibrium evaluation system of supply and demand equilibrium of the agricultural water resources in Sichuan hilly areas and evaluated the equilibrium of supply and demand using the methods of multi-factors comprehensive appraisal and principal component analysis. The results showed that:(1)The result of estimation proved that total volume of agriculture water resources of 68 counties was 821.72×10~8 m~3 in Sichuan hilly areas. And including soil water resources of 350.96×10~8 m~3 , which took up 42.71% of total volume ofagriculture water resources in hilly area. Xuanhan county, Yibin county and Renshou county had most amount of agriculture water resources. The storages were 39.22><108 m3 (4.77% of total volume of agriculture water resources), 33.96><108 m3 (4.13% of the total) and 32.29xlO10 m3(3.93% of the total), respectively. But it could be found that Jinggong and Da'an districts had a severe water resources shortage problem. Their storages were 0.63 xlO8 m3and 1.87xlO8 m3, respectively, and took up 0.08% and 0.23% of total volume of agriculture water resources of Sichuan hilly areas, only, respectively.(2) The multi-factors comprehensive appraisalled that there were 20 counties achieved their agriculture water supply-demand equilibrium in Sichuan hilly areas took up 36.7% of total volume of agriculture water resources of Sichuan Province. They were Pengshan, Luojiang, Pujiang, Dongpo, Yatan, Cuiping, Renshou, Mingshan, Qingshen, Danling, Wutong bridge district, Hongya, Jianwei, Jianyang, Zitong, Da'an, Nanbu, Tongchuan, Jingyan and Shunqing.(3) The result of using the principal component analysis method indicated that there were 25 counties achieve agriculture water supply-demand equilibrium and they had 36.7% of total volume of agriculture water of Sichuan Province. They were: Pengshan, Yantan, Hongya, Mingshan, Luojiang, Pujiang, Dongpo, Danling, Jianwei, Wutong bridge district, Zitong, Qingshen, Renshou, Cuiping, Xuanhan, Jingyan, Tongchuan, Yanting, Zhongjiang, Santai, Qu county, Dazhu, Nanbu, Wusheng and Yibin.(4) By comparing the two methods, the results showed that 20 counties achieved agriculture water resources supply-demand equilibrium and their storages took up 29.4% of the total volume of Sichuan. They were Pengshan, Luojiang, Pu jiang, Dongpo district, Yantan district, Cuiping district, Renshou, Mingshan, Qingshen, Danling, Wutong bridge district, Hongya, Jianwei, Zitong, Nanbu, Tongchuan district, Wusheng, Qu county, Santai and Dazhu.The results which got above showed that the two methods could be used in the evaluation of agriculture water resources. But the twos all had their advantages and disadvantages: First, The advantage of the method of multi-factors comprehensiveappraisal was simple. And disadvantages were that its indexes were excessively and the variety trend of values was inconspicuous after the metadata were standardized. Second, the advantage of principal component analysis was that its indexes were more reasonable and the trend of results were more conspicuous, but it couldn't reflect the whole information and would cause information's loss.Affected by a good many influential factors, the paper still had some problems, such as: first, excessive evaluation unit owing to many different towns in hill region, the limits as a result of human resources, material resources, and financial resources both make it more difficult to collect and analyze data, and to lack of plentiful texts ,data, and maps. As a result, it was not all-around to select evaluation indices. Second, on dealing indexes, it couldn't finds a feasible method of standardizing data at rank indexes which was difficult to quantize such as the rank of water quality. It just gave value according to the rank simply, so standardized indexes affect the result.Towards evaluating agriculture water resources in Sichuan hilly areas, it had much work to do. The suggestion were: first, reinforcing the research on evaluated system indexes of supply and demand equilibrium of the agricultural water resources, striving for setting up a feasible system indexes for counties in hilly areas and evaluating the supply and demand equilibrium of county's agricultural water resources. Second, setting up a perfect models for evaluating agricultural water resource which was fit for different areas to choose. At last, we could use advanced technology and methods such as 3S technology to evaluate the sustainable utilization of county's agricultural water resources.
Keywords/Search Tags:agriculture water resources, supply-demand equilibrium, multi-factors comprehensive appraisal, principal component analysis
PDF Full Text Request
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