鄱阳湖流域红壤坡耕地表土资源可持续利用研究

发布时间：2018-05-29 08:40

本文选题：红壤 + 坡耕地　；参考：《江西农业大学》2015年硕士论文

【摘要】：本研究从鄱阳湖流域红壤坡耕地表土资源状况调查入手,摸清鄱阳湖流域红壤坡耕地表土资源肥力状况和土壤抗蚀性状况,分析表土肥力质量—作物生长—土壤抗蚀性三者的定量关系;为保护和提高土地生产力,加快山丘区新农村建设全面实现农业现代化提供强有力的技术支撑,实现经济发展和生态保护“双赢”。本文以表土资源肥力状况和土壤抗蚀性状况两大问题为主线,以进贤县、高安市和湖口县坡耕地为研究对象,探讨了表土资源土壤有机质、全N、全P、全K、碱解N、速效P、速效K、CEC和土壤抗蚀性等指标在空间上的变异情况,分析了影响变异的限制性因素。同时,以江西水土保持生态科技园坡耕地为研究对象,设置花生盆栽实验,通过0、10、20、30、40cm5种不同表土回填厚度来研究表土肥力质量—作物生长—土壤抗蚀性三者定量关系。结合已修正过的内梅罗综合质量指数对土壤肥力进行了综合评定,采用主成分分析法确定了土壤抗蚀性综合指数。主要研究结果如下:(1)鄱阳湖流域红壤坡耕地表土资源养分分布特征与土壤肥力质量评价通过内梅罗土壤肥力综合评价模型评价了三个实验区坡耕地表土肥力质量,结果表明表土肥力质量综合指数由高到低分别为进贤县高安县湖口县。与原状荒坡地相比,进贤县、湖口县坡耕地土壤肥力质量综合指数均有增大,分别增加14.38%和6.39%,而高安市土壤肥力质量综合质量指数则降低了6.04%。(2)鄱阳湖流域红壤坡耕地表土资源土壤抗蚀性研究通过主成分分析可知坡耕地表土抗蚀性指数由高到低分别为进贤县高安县湖口县。较原状荒坡地进贤县、高安市、湖口县坡耕地表土相对抗蚀性指数减弱比例分别为1.14%、13.58%和13.04%。(3)红壤坡耕地不同表土厚度对土地生产力的影响研究表土回填厚度在0~40cm范围内,根据修订的内梅罗土壤肥力综合评价模型对上述处理进行评价可知,随着表土回填厚度增加,土壤综合质量指数逐渐增加,从大到小依次为40cm、30cm、20cm、10cm、0cm处理。同时,30cm处理与40cm处理无显著性差异。同时由主成分分析结果可知30cm处理抗蚀性最强,土壤抗蚀性综合指数从大到小依次为30cm、40cm、20cm、10cm、0cm。表土回填厚度在0~40cm范围内,回填40cm处理有利于增加花生株高、产量干重和生物量干重的积累,但30cm处理与40cm处理之间没有显著性差异。通过sigmaplot对土壤肥力质量、土壤抗蚀性、作物生长进行三维分析可知三者之间关系形成一个由Z=65.25*exp(-0.5*(((x-5.20)/3.24)2+((y-1.26)/2.48)2))二元二次指数方程组成的曲面。
[Abstract]:This study, starting with the survey of the topsoil resources in the red soil slope farmland in the Poyang Lake basin, makes a clear understanding of the fertility status of the topsoil resources and the corrosion resistance of the soil in the red soil slope of the Poyang Lake basin, and analyses the quantitative relationship between the quality of the topsoil fertility - the crop growth and the soil corrosion resistance of the three people; for the protection and improvement of the land productivity and the acceleration of the construction of the new rural areas in the hilly areas Based on two major problems of soil resources fertility and soil corrosion resistance, this paper takes Jinxian County, Gao An City and Hukou County as the research object, and probes into the soil organic matter of the topsoil resources, all N, all P and all K, The variation of N, quick acting P, quick acting K, CEC and soil corrosion resistance were analyzed in space, and the restrictive factors affecting the variation were analyzed. At the same time, the pot experiment of Jiangxi soil and Water Conservation Ecological Science Park was set up as the research object, and the pot experiment of peanut was set up, and the soil fertility quality was studied by the different topsoil backfilling thickness of 0,10,20,30,40cm5. The quantitative relationship between material growth and soil erosion resistance is three. Combined with the revised Nemero comprehensive quality index, the soil fertility was evaluated synthetically, and the comprehensive index of soil erosion resistance was determined by principal component analysis. The main results are as follows: (1) the nutrient distribution characteristics and soil fertility quality of the soil resources in the red soil slope farmland in the Poyang Lake Basin The evaluation of the soil fertility quality of three experimentation area sloping farmland by Nemero soil fertility evaluation model shows that the comprehensive index of topsoil fertility quality is from high to low in Hukou County, Jinxian County, Gao An county, respectively. Compared with the original slope land, the soil fertility quality index of the slope ploughed land in Jinxian county and Hukou county has increased, respectively. The increase of 14.38% and 6.39%, while the comprehensive quality index of soil fertility quality in high an City decreased 6.04%. (2) the soil erosion resistance of the red soil slope cultivated land in Poyang Lake basin. Through the principal component analysis, it can be found that the corrosion resistance index of the slope farmland is from high to low in Hukou County, Jinxian County, Jinxian county and Gao An City. The decrease ratio of relative corrosion resistance index of slope farmland in Hukou county is 1.14%, 13.58% and 13.04%. (3) the influence of different surface soil thickness on land productivity in red soil slope cultivated land. The thickness of topsoil backfilling is within the range of 0~40cm. As the filling thickness increased, the soil comprehensive quality index increased gradually, from large to small to 40cm, 30cm, 20cm, 10cm, 0cm treatment. At the same time, there was no significant difference between 30cm treatment and 40cm treatment. At the same time, the results of principal component analysis showed that 30cm treatment had the strongest corrosion resistance, and the comprehensive index number of soil corrosion resistance was 30cm, 40cm, 20cm, 10cm, and soil backfilling from large to small. In the range of 0~40cm, backfilling 40cm treatment was beneficial to increase the height of peanut plant, the dry weight of yield and the accumulation of biomass dry weight, but there was no significant difference between the 30cm treatment and the 40cm treatment. The relationship between the soil fertility quality, soil erosion resistance and crop growth by SigmaPlot was found to form a Z=65.25*exp (-0). .5* ((x-5.20) /3.24) 2+ ((y-1.26) /2.48) 2) the surface of two variables two times exponential equation.
【学位授予单位】：江西农业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：F323.211;S151.9

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