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您的检索式：作者名="J.S.BAILEY"
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| 1 | Neural Network Ensemble Residual Kriging Application for Spatial Variability of Soil Properties显示文摘High quality, agricultural nutrient distribution maps are necessary for precision management, but depend on initial soil sample analyses and interpolation techniques. To examine the methodologies for and explore the capability of interpolating soil properties based on neural network ensemble residual kriging, a silage field at Hayes, Northern Ireland, UK, was selected for this study with all samples being split into independent training and validation data sets. The training data set, comprised of five soil properties: soil pH, soil available P, soil available K, soil available Mg and soil available S,was modeled for spatial variability using 1) neural network ensemble residual kriging, 2) neural network ensemble and 3) kriging with their accuracies being estimated by means of the validation data sets. Ordinary kriging of the residuals provided accurate local estimates, while final estimates were produced as a sum of the artificial neural network (ANN)ensemble estimates and the ordinary kriging estimates of the residuals. Compared to kriging and neural network ensemble,the neural network ensemble residual kriging achieved better or similar accuracy for predicting and estimating contour maps. Thus, the results demonstrated that ANN ensemble residual kriging was an efficient alternative to the conventional geo-statistical models that were usually used for interpolation of a data set in the soil science area. | SHENZhang-Quan SHIJie-Bin WANGKe KONGFan-Sheng J.S.BAILEY | 2004 | Pedosphere2004，14，3： | 37 |
| 2 | 稻田土壤养分空间变异与合理取样数研究显示文摘以嘉善县陶庄农场内一块0.52hm^2的水稻田为研究区,采用地统计方法和常规统计方法进行土壤pH及养分(全氮、全碳、速效钾、速效磷、速效镁、速效锰、速效铜、速效锌)的空间变异及其合理取样数目研究。结果表明,各土壤养分在田间尺度均存在一定的空间变异,全氮、全碳、速效钾、速效磷等主要养分的空间格局呈南北向条带状,与农户经营田块的方向基本一致;不同农户耕种、管理下的4田块的土壤养分差异显著;反映土壤肥力的土壤全碳、全氮等养分的合理取样数目在95%的置信度和5%的相对误差条件下为4~5个,基本上每个农户经营田块为1个,即可反映土壤养分的真实情况。因此,试验区以N素管理为主的精确田间管理的土壤采样可以采用以农户经营地块为单位的混合样采样方式,以减少土壤采样量和分析成本。 | 许红卫 高克异 王珂 周斌 J.S.Bailey | 2006 | 植物营养与肥料学报2006，12，1： | 38 |
| 3 | Sampling Strategies for Soil Available K and P at Field Scale显示文摘Field nutrient distribution maps obtained from the study on soil variations within fields are the basis of precision agriculture. The quality of these maps for management depends on the accuracy of the predicted values, which depends on the initial sampling. To produce reliable predictions efficiently the minimal sampling size and combination should be decided firstly, which could avoid the misspent funds for field sampling work. A 7.9 hectare silage field close to the Agricultural Research institute at Hillsborough, Northern Ireland, was selected for the study. Soil samples were collected from the field at 25 m intervals in a rectangular grid to provide a database of selected soil properties. Different data combinations were subsequently abstracted from this database for comparison purposes, and ordinary kriging used to produce interpolated soil maps. These predicted data groups were compared using least significant difference (LSD) test method. The results showed that the 62 sampling sizes of triangle arrangement for soil available K were sufficient to reach the required accuracy. The triangular sample combination proved to be superior to a rectangular one of similar sample size. | SHIZHOU J.S.BAILEY 等 | 2000 | Pedosphere2000，10，4： | 10 |
| 4 | 牧草干物质产量的时空变异及其制图研究显示文摘以英国 Hillsborough农业研究所附近的一块 7.9hm2的牧草田为研究区 ,采用地统计方法研究分析连续 3年的牧草干物质产量在 3个收割季节的空间变异 ,并研究了第一、二季其空间分布的变异在时间上的稳定性 ,在此基础上制作了牧草干物质产量分级管理地图。第三季由于天气原因未能收集到 2 0 0 1年的数据而未做时间稳定性研究。结果表明 ,牧草产量在第一季的空间变异最小且在时间上基本稳定 ,因此 ,在第一季 ,根据牧草干物质产量分级管理地图对该牧草地进行精确管理 ,特别是精确肥料管理 ,是可行的 ;而在第二季 ,牧草产量的空间分布非常零散 ,且在时间上表现为不稳定 ,目前还很难对该牧草地进行精确管理。 | 许红卫 周斌 王人潮 J.S.Bailey | 2003 | 农业工程学报2003，19，4： | 1 |
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