Search Results - "LARK, R. M"

To till or not to till in a temperate ecosystem? Implications for climate change mitigation by Cooper, H V, Sjögersten, S, Lark, R M, Mooney, S J

“…The management of agricultural soils affect the composition and scale of their greenhouse gas (GHG) emissions. There is conflicting evidence on the effect of…”
Get full text

Boundary line analysis of the effect of water‐filled pore space on nitrous oxide emission from cores of arable soil by Lark, R. M, Milne, A. E

“…The boundary line has been proposed as a model of the effects of a variable on a biological response, when this variable might limit the response in only some…”
Get full text

Soil and landscape factors influence geospatial variation in maize grain zinc concentration in Malawi by Botoman, L., Chagumaira, C., Mossa, A. W., Amede, T., Ander, E. L., Bailey, E. H., Chimungu, J. G., Gameda, S., Gashu, D., Haefele, S. M., Joy, E. J. M., Kumssa, D. B., Ligowe, I. S., McGrath, S. P., Milne, A. E., Munthali, M., Towett, E., Walsh, M. G., Wilson, L., Young, S. D., Broadley, M. R., Lark, R. M., Nalivata, P. C.

“…Dietary zinc (Zn) deficiency is widespread globally, and in particular among people in sub-Saharan Africa (SSA). In Malawi, dietary sources of Zn are dominated…”
Get full text

Application of a novel method for soil aggregate stability measurement by laser granulometry with sonication by Rawlins, B. G., Wragg, J., Lark, R. M.

“…Aggregate stability is an important physical indicator of soil quality, and so methods are required to measure it rapidly and cost‐effectively so that…”
Get full text

Scope to predict soil properties at within-field scale from small samples using proximally sensed γ-ray spectrometer and EM induction data by Huang, J., Lark, R.M., Robinson, D.A., Lebron, I., Keith, A.M., Rawlins, B., Tye, A., Kuras, O., Raines, M., Triantafilis, J.

“…Spatial predictions of soil properties are needed for various purposes. However, the costs associated with soil sampling and laboratory analysis are…”
Get full text

Spatially nested sampling schemes for spatial variance components: Scope for their optimization by Lark, R.M.

“…Efficient designs for nested sampling are needed in many areas of science. In the geosciences they are used to discover the important spatial scales on which…”
Get full text

Mapping trace element deficiency by cokriging from regional geochemical soil data: A case study on cobalt for grazing sheep in Ireland by Lark, R.M., Ander, E.L., Cave, M.R., Knights, K.V., Glennon, M.M., Scanlon, R.P.

“…Deficiency or excess of certain trace elements in the soil causes problems for agriculture, including disorders of grazing ruminants. Geostatistics has been…”
Get full text

A comparison of some robust estimators of the variogram for use in soil survey by Lark, R. M.

“…Summary The standard estimator of the variogram is sensitive to outlying data, a few of which can cause overestimation of the variogram. This will result in…”
Get full text

Cereal grain mineral micronutrient and soil chemistry data from GeoNutrition surveys in Ethiopia and Malawi by Kumssa, D. B., Mossa, A. W., Amede, T., Ander, E. L., Bailey, E. H., Botoman, L., Chagumaira, C., Chimungu, J. G., Davis, K., Gameda, S., Haefele, S. M., Hailu, K., Joy, E. J. M., Lark, R. M., Ligowe, I. S., McGrath, S. P., Milne, A., Muleya, P., Munthali, M., Towett, E., Walsh, M. G., Wilson, L., Young, S. D., Haji, I. R., Broadley, M. R., Gashu, D., Nalivata, P. C.

“…The dataset comprises primary data for the concentration of 29 mineral micronutrients in cereal grains and up to 84 soil chemistry properties from GeoNutrition…”
Get full text

Quality measures for soil surveys by lognormal kriging by Lark, R.M., Lapworth, D.J.

“…If we know the variogram of a random variable then we can compute the prediction error variances (kriging variances) for kriged estimates of the variable at…”
Get full text

Robust geostatistical prediction of trace elements across France by Saby, N.P.A., Marchant, B.P., Lark, R.M., Jolivet, C.C., Arrouays, D.

“…National-scale soil monitoring networks are required to identify where the soil quality is threatened and evaluate the effectiveness of any remediation…”
Get full text

Spatial prediction of soil properties with copulas by Marchant, B.P., Saby, N.P.A., Jolivet, C.C., Arrouays, D., Lark, R.M.

“…The uncertainty of a prediction of a spatial property may only be fully described if the property is assumed to be a realization of a multivariate random…”
Get full text

Two contrasting spatial processes with a common variogram: inference about spatial models from higher-order statistics by Lark, R. M.

“…Geostatistical analysis of soil properties is undertaken to allow prediction of values of these properties over regions or at unsampled locations. A key step…”
Get full text

Generic Issues on Broad-Scale Soil Monitoring Schemes： A Review by ARROUAYS, D., MARCHANT, B.P., SABY, N.P.A., MEERSMANS, J., ORTON, T.G., MARTIN, M.P., BELLAMY, P.H., LARK, R.M., KIBBLEWHITE, M.

“…Numerous scientific challenges arise when designing a soil monitoring network （SMN）, especially when assessing large areas and several properties that are…”
Get full text

Robust analysis of soil properties at the national scale: cadmium content of French soils by Marchant, B.P, Saby, N.P.A, Lark, R.M, Bellamy, P.H, Jolivet, C.C, Arrouays, D

“…National-scale soil datasets exhibit variation over widely disparate spatial scales. Geological variation is an important source at the coarsest scale, and one…”
Get full text

Which sampling design to monitor saturated hydraulic conductivity? by Hassler, S. K., Lark, R. M., Zimmermann, B., Elsenbeer, H.

“…Summary Soil in a changing world is subject to both anthropogenic and environmental stresses. Soil monitoring is essential to assess the magnitude of changes…”
Get full text

Interpretative modelling of a geological cross section from boreholes: sources of uncertainty and their quantification by Lark, R. M, Thorpe, S, Kessler, H, Mathers, S. J

“…We conducted a designed experiment to quantify sources of uncertainty in geologists' interpretations of a geological cross section. A group of 28 geologists…”
Get full text

Airborne radiometric survey data and a DTM as covariates for regional scale mapping of soil organic carbon across Northern Ireland by Rawlins, B.G, Marchant, B.P, Smyth, D, Scheib, C, Lark, R.M, Jordan, C

“…Soil scientists require cost-effective methods to make accurate regional predictions of soil organic carbon (SOC) content. We assess the suitability of…”
Get full text

Robust estimation of the variogram by residual maximum likelihood by Marchant, B.P., Lark, R.M.

“…For spatial prediction of soil variables where the local mean can be expressed as a local trend, or a linear function of some auxiliary (external drift)…”
Get full text

Modelling complex geological circular data with the projected normal distribution and mixtures of von Mises distributions by Lark, R. M, Clifford, D, Waters, C. N

“…Circular data are commonly encountered in the earth sciences and statistical descriptions and inferences about such data are necessary in structural geology…”
Get full text