| PI模型在乌兰察布市土壤生产力评价中的适用性研究 |
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| 引用本文： | 郑娟娟,常婧,高晓飞.PI模型在乌兰察布市土壤生产力评价中的适用性研究[J].中国农学通报,2013,29(14):124-128. |
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| 作者姓名： | 郑娟娟 常婧 高晓飞 |
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| 作者单位： | 北京师范大学地理学与遥感科学学院,北京,100875 |
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| 基金项目： | 中央高校基本科研业务费专项“流域土壤侵蚀模型研究”(104-105568GK)；国家重点基础研究计划项目课题“多尺度土壤侵蚀预报模型”(2007CB407204)。 |
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| 摘 要： | 为了给乌兰察布市土壤生产力评价提供一种简单、实用、客观的评价方法，在PI模型及后人修正的PI模型(MPI)的基础上，结合研究区土壤特点，对PI模型进行了修正(MPI-Ⅱ)，主要修改了MPI模型中有机质指标的计算方法，并增加了碳酸钙指标。利用MPI模型和MPI-Ⅱ模型，评价了43个土种的土壤生产力，并与研究区第2次土壤普查中综合评价法的评价值进行了比较。结果表明：（1）MPI-Ⅱ模型的评价值与综合评价法的评价值之间的相关性(R2=0.589,P<0.01)比MPI模型与综合评价法之间的相关性(R2=0.305, P<0.01)高，MPI-Ⅱ的评价值可能更接近研究区的实际情况；（2）总体而言，MPI-Ⅱ模型的评价值与综合评价法的评价值较一致，但有5种土壤的评价值差异较大，可能是综合评价法的主观性较强所致。因此，MPI-Ⅱ模型对研究区的土壤生产力评价可能有较好的适用性。
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| 关 键 词： | 时空特征 时空特征 |
| 收稿时间： | 2012/8/21 0:00:00 |
| 修稿时间： | 2012/9/25 0:00:00 |
Application of PI Model in Soil Productivity Assessment in Wulanchabu City |
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| Zheng Juanjuan
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Chang Jing
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Gao Xiaofei.Application of PI Model in Soil Productivity Assessment in Wulanchabu City[J].Chinese Agricultural Science Bulletin,2013,29(14):124-128. |
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| Authors: | Zheng Juanjuan Chang Jing Gao Xiaofei |
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| Abstract: | In order to find an easily usable, practical and objective model to assess soil productivity in Wulanchabu City, the author modified PI model (MPI-Ⅱ) based on the PI model and existing modified PI model (MPI). Considering the soil characteristics of study area, the calculation method of suitability index of organic matter of MPI was improved, meanwhile, CaCO3 content was added to MPI-II model as a new parameters. Firstly, the author selected soil species in study area to assess their productivity index using the MPI model and MPI-Ⅱ separately. Then, simulated results were compared with the assessed value by comprehensive assessment method which was used in the second soil survey. The results showed that: (1) the determination coefficient between the calculation value of MPI-Ⅱ model and comprehensive assessment method with R2=0.589 (P<0.01) was higher than that between the calculation value of MPI model and comprehensive assessment method with R2=0.305 (P<0.01), which meant that the calculation value of MPI-Ⅱ was more closer to the real situation in the study area; (2) Generally speaking, the calculation value of MPI-Ⅱ model was compatible with comprehensive assessment method except that 5 soils showed obvious difference between them, most probably due to the subjective of comprehensive assessment method. In conclusion, the MPI-Ⅱ model was more suitable than MPI model for the productivity assessment in Wulanchabu City. |
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| Keywords: | Wulanchabu City comprehensive assessment method PI model MPI model assessed value difference analysis |
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