兰州大学机构库 >生命科学学院
甘肃省宁县耕地地力评价及土壤养分时空变异研究
Alternative TitleEvaluation of farmland fertility and spatio-temporal variation of soil nutrient in Ning County of Gansu Province
杨云卉
Thesis Advisor李小刚
2011-05-30
Degree Grantor兰州大学
Place of Conferral兰州
Degree Name硕士
Keyword耕地地力 评价 地理信息系统 土壤养分 时空变异
Abstract本研究以宁县第二次土壤普查数据和2007年耕地地力采样数据为数据资源,对宁县耕地土壤养分时空变异进行了研究,同时对宁县耕地地力进行了评价。主要结果如下: (1)与1984年第二次土壤普查结果比较,淤积土、黄墡土、黄绵土、红土和黑垆土的有机质和全氮含量明显增加,其主要原因是农业管理措施的改变,近20多年来化肥和有机肥的施入量显著增加,因而作物产量及其生物量也同时增加,那么通过根茬和凋落物的归还量也相应的增加。而自然土壤山地灰褐土、灰墡土和灰绵土由于开垦利用,有机质和全氮含量均明显降低。 利用地统计分析方法,对2007年主要耕层养分的半变异函数分析表明,有机质、速效钾和有效磷的C/( C0<下标!>+C )比值分别为0.500、0.500和0.516,均具有中等强度的空间异质性。 (2) 宁县耕地面积为86251.3 hm2<上标!>,共划分为六个等级。其中,一、二等地(国家地力等级的五等地)面积为27295.4 hm2<上标!>,占总耕地面积的31.6%;三等地(国家六等地)面积为14732.7 hm2<上标!>,占总耕地面积的17.1%;四等地(国家七等地)面积为22037.0 hm2<上标!>,占总耕地面积的25.6%;五、六等地(国家八等地)面积为22186.1 hm2<上标!>,占总耕地面积的25.7%。 本研究对推动宁县耕地资源的合理配置,优化种植业生产结构,提高农业生产力起到了积极作用。
Other AbstractThe study area is located in Ning County of southeastern Gansu province. We collected data from the second soil survey report conducted in the early 1980s and soil sampling measurement data in 2007, respectively. Based on the above data source, we analysed spatio-temporal variation of topsoil nutrients in croplands and evaluated the cropland fertility of Ning County. The results showed that: (1) Both topsoil SOM and TN increased significantly in those soils such as Alluvial soil, Huangshan soil, Loessal soil and Heilu soil. These were mainly attributed to rapid increasing organic matter return resulted from increasing fertilizer application and crop biomass. However, the mean topsoil SOM and TN concentration in croplands of Grey-cinnamon soil, Huishan Soil and Huimian Soil in 2007 showed a significant decrease trend compared with that in 1984. All of the topsoil SOM, AK and AP displayed moderate spatial heterogeneity, with the value in C / (C0<下标!> + C) of 0.500, 0.500 and 0.516, respectively. (2)The total cultivated land area of Ning County is 86251.3 ha which can be divided into six grades. The area of grade one to grade two is 27295.4 ha, grade three 14732.7 ha, grade four 22037.0 ha, grade five to grade six 22186.1 ha, amounting to 31.6%, 17.1%, 25.6%, 25.7%, respectively. The study will play a positive role in promoting the rational allocation of cultivated land, optimizing farming production structure in Ning County.
URL查看原文
Language中文
Document Type学位论文
Identifierhttps://ir.lzu.edu.cn/handle/262010/221445
Collection生命科学学院
Recommended Citation
GB/T 7714
杨云卉. 甘肃省宁县耕地地力评价及土壤养分时空变异研究[D]. 兰州. 兰州大学,2011.
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