Fu, Weijun

Tunney, H.

Zhang, C.

English

University of Kentucky

University of Kentucky UKnowledge International Grassland Congress Proceedings 21st International Grassland Congress / 8th International Rangeland Congress Using GIS and Geostatistics to Study Spatial Variation of Soil Test Phosphorus in Grassland Weijun Fu Teagasc, Ireland H. Tunney Teagasc, Ireland C. Zhang Department of Geography, Ireland Follow this and additional works at: https://uknowledge.uky.edu/igc  Part of the Plant Sciences Commons, and the Soil Science Commons This document is available at https://uknowledge.uky.edu/igc/21/5-1/24 The 21st International Grassland Congress / 8th International Rangeland Congress took place in Hohhot, China from June 29 through July 5, 2008. Proceedings edited by Organizing Committee of 2008 IGC/IRC Conference Published by Guangdong People's Publishing House This Event is brought to you for free and open access by the Plant and Soil Sciences at UKnowledge. It has been accepted for inclusion in International Grassland Congress Proceedings by an authorized administrator of UKnowledge. For more information, please contact UKnowledge@lsv.uky.edu. 瞯 ]664　 瞯 　 Multifunctional Grasslands in a Changing World 　 Volume Ⅰ 　Grasslands/Rangelands Resources and Ecology ——— Application of Information Technology in Monitoring and Managing Grasslands/Rangelands ResourcesUsing GIS and geostatistics to study spatial variation of soil test phosphorus in grasslandW . Fu1 ,2 , H . Tunney 1 and C . Zhang21 Teagasc , Johnstown Castle Research Centre , Wex f ord , I reland , E‐mail : wei j un .f u＠ teagasc .ie2 Department o f Geography , NUI , Galway , I relandKey words : spatial variation , soil test phosphorus , GIS , geostatisticsIntroduction There is little information on spatial variation of soil test phosphorus . This is now important because of the use ofsoil test phosphorus as a basis for national and EU policies such as the recently introduced Nitrate Directive ( StatutoryInstrument ３７８ of ２００６) . Systematic soil sampling methods such as grid sampling have been proposed to better evaluate soilfertility (Wollenhaupt et al . , １９９４ ) . Soil test vaules collected by grid sampling can be directly mapped or may be used toevaluate the values of unsampled locations using spatial interpolation ( Mallarino , １９９６) .Material and methods A typical permanent grassland( total area : ４５ hectares) ,at Wexford , Ireland ,was chosen in this study . Atotal of ５３７ soil samples were collected from a point (１０ cm diameter) based on a ３０m × ３０m grid system . Soil test phosphorus( P) , potassium ( K) , magnesium (Mg) , pH and lime requirement ( LR) were determined . Geostatistics and GIS were used tostudy spatial variation of soil test phosphorus ( as an example of soil test nutrients) .Results and discussion A clear spatial distribution of P was mapped in Figure １ . Most of the P values were in the medium range ,according to European Communities Regulations ( Anonymous , ２００６ ) . Some patched high P values was discerned thatcorresponded to the early slurry spreading in the study area . P data followed a positively skewed distribution . Good spatialcorrelation of P was observed af ter log‐transformation of the data , which can be fitted by a spherical model ( Figure ２) .Figure 1 Symbol map show ing soil test P . Figure 2 Ex perimental semivariogram and f itted Pmodel .Conclusions Results indicated that the uneven slurry spread and other management practices ( e .g . ?) were the main factors forspatial distribution of soil test phosphorus . It is concluded that GIS combined geostatistics was a useful tool to study spatialvariation of soil nutrients at farm scale .ReferencesAnonymous (２００６ ) . S .I . No .３７８ . European Communities ( Good agricultural Practice for Protection of Waters) Regulations .Mallarino , A .P . (１９９６) . Spatial variability patterns of phosphorus and potassium in no‐tilled soils for two sampling scales .Soil Science Society o f American Journey , ６０ , １４７３‐１４８１ .Wollenhaupt , N .C . , R .P .Wolkowski , and M .K . Clayton . ( １９９４) . Mapping soil test phosphorus and potassium for variable‐rate fertilizer application . Journal o f p roduction A griculture . ７ , ４４１‐４４８ .P distribution 6 0 'b N 24 [JJ P (mg/L) ,.. 9 0 0-3 18 I 3-6 ~ • C 6-10 ::0 0 C 10-20 ., 0 20 -113.5 :;· 12 (fQ □ outline ., ::0 9 06 500 1000 Meters 0.0 0 00 160 240 320 400 Distance (m) 

Using GIS and Geostatistics to Study Spatial Variation of Soil Test Phosphorus in Grassland

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Using GIS and Geostatistics to Study Spatial Variation of Soil Test Phosphorus in Grassland

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