基于BP-ANN模型的農(nóng)村土地生態(tài)安全評(píng)價(jià)及影響因素分析——以重慶市豐都縣為例
[Abstract]:According to the sensitive characteristics of land ecology in Fengdu County of Chongqing and the actual situation of the region, the evaluation index value of land ecological security is taken as input and the evaluation score of land ecological security is taken as output. Based on multilayer back-propagation artificial neural network (BP-ANN), a three-layer land ecological security evaluation model with 15 hidden layer neurons was constructed. 200 of the 317 total samples in 2013 were randomly selected by Matlab R2012b. 70% of them were used as network training samples and test samples respectively for training and testing BP-ANN,. The remaining 117 samples were used to test the network, and then the relative index values of 317 villages in 2014 were replaced by artificial neural networks for evaluation by pattern recognition. On this basis, the spatial differentiation of the ecological security of rural land in Fengdu County is analyzed, and the factors influencing the ecological security of rural land in Fengdu County are studied by factor analysis combined with multiple linear regression analysis. The results showed that: (1) 98.21% of 117 samples with relative error less than 5% had good accuracy of BP-ANN model, (2) the land ecological security score of Fengdu County in 2014 was 40.47 (55.73), with an average score of 49.19, and the land ecological security situation was at a moderate and lower level. The global Morans'I index of land ecological security score is 0. 34, which is autocorrelation in space. (3) the factors influencing the ecological security of rural land in Fengdu County are: vegetation biological condition, soil condition, landscape diversity, ecological construction and development coordination. To some extent, the BP-ANN model overcomes the errors caused by the subjective factors in the traditional evaluation process, and the accurate evaluation results provide guidance for the regional land ecological protection.
【作者單位】: 西南大學(xué)地理科學(xué)學(xué)院;
【基金】:“西南山區(qū)生態(tài)敏感區(qū)典型區(qū)域土地生態(tài)狀況信息提取與精細(xì)評(píng)估”項(xiàng)目(201315106397)
【分類號(hào)】:F301.24
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