Spatial variability of soil CO2 emission in a sugarcane area characterized by secondary information


Autoria(s): Teixeira, Daniel de Bortoli; Bicalho, Elton da Silva; Panosso, Alan Rodrigo; Cerri, Carlos Eduardo Pellegrino; Pereira, Gener Tadeu; Scala Júnior, Newton La
Contribuinte(s)

Universidade Estadual Paulista (UNESP)

Data(s)

20/05/2014

20/05/2014

01/06/2013

Resumo

Soil CO2 emission (FCO2) is governed by the inherent properties of the soil, such as bulk density (BD). Mapping of FCO2 allows the evaluation and identification of areas with different accumulation potential of carbon. However, FCO2 mapping over larger areas is not feasible due to the period required for evaluation. This study aimed to assess the quality of FCO2 spatial estimates using values of BD as secondary information. FCO2 and BD were evaluated on a regular sampling grid of 60 m × 60 m comprising 141 points, which was established on a sugarcane area. Four scenarios were defined according to the proportion of the number of sampling points of FCO2 to those of BD. For these scenarios, 67 (F67), 87 (F87), 107 (F107) and 127 (F127) FCO2 sampling points were used in addition to 127 BD sampling points used as supplementary information. The use of additional information from the BD provided an increase in the accuracy of the estimates only in the F107, F67 and F87 scenarios, respectively. The F87 scenario, with the approximate ratio between the FCO2 and BD of 1.00:1.50, presented the best relative improvement in the quality of estimates, thereby indicating that the BD should be sampled at a density 1.5 time greater than that applied for the FCO2. This procedure avoided problems related to the high temporal variability associated with FCO2, which enabled the mapping of this variable to be elaborated in large areas.

Formato

195-203

Identificador

http://dx.doi.org/10.1590/S0103-90162013000300008

Scientia Agricola. São Paulo - Escola Superior de Agricultura Luiz de Queiroz, v. 70, n. 3, p. 195-203, 2013.

0103-9016

http://hdl.handle.net/11449/1287

10.1590/S0103-90162013000300008

S0103-90162013000300008

WOS:000320022600008

S0103-90162013000300008.pdf

Idioma(s)

eng

Publicador

Universidade de São Paulo (USP), Escola Superior de Agricultura Luiz de Queiroz (ESALQ)

Relação

Scientia Agricola

Direitos

openAccess

Palavras-Chave #Geostatistics #cokriging #ordinary kriging #cross-variogram
Tipo

info:eu-repo/semantics/article