the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Spatial variability and sampling density of chemical attributes in archaeological black earths under pasture in southern Amazonas, Brazil
Abstract. Spatial mapping of soil chemical attributes is essential for sampling efficiency and agricultural planning management, ensuring a regional development and sustainability of the unique characteristics of archaeological black earths (ABEs). Thus, this study was developed aiming at assessing the spatial variability and sampling density of chemical attributes in soils of ABEs under pasture in southern Amazonas, Brazil. A sampling grid of 56 × 80 m with regular spacings of 8 m was installed in the experimental area and samples were taken from the crossing points at depths of 0.0–0.05, 0.05–0.10, and 0.10–0.20 m, totaling 264 georeferenced points. The chemical attributes pH in water, organic carbon, Ca, Mg, K, P, Al, and potential acidity were determined in these samples, while CEC, SB, V, t, T, and m were calculated. The attributes present a spatial dependence varying from strong to moderate, being Al3+ the only chemical attribute that does not present a spatial dependence structure in the assessed depths. Scaled semivariograms satisfactorily reproduce the spatial behavior of attributes in the same pattern of individual semivariograms, allowing their use to estimate the variability of soil attributes. Sampling density is higher at a depth of 0.0–0.05 m, requiring 2 and 1 point ha−1 at depths of 0.05–0.10 and 0.10–0.20 m, respectively, to represent the spatial pattern of chemical attributes.
- Preprint
(964 KB) - Metadata XML
- BibTeX
- EndNote
-
RC1: 'Review', Anonymous Referee #1, 08 Jul 2019
-
AC1: 'Response to comments and reviews on the work.', Milton Campos, 06 Aug 2019
-
RC2: 'Response to response', Anonymous Referee #1, 17 Oct 2019
- AC2: 'Response', Elilson Gomes de Brito Filho, 17 Feb 2020
-
RC2: 'Response to response', Anonymous Referee #1, 17 Oct 2019
-
AC1: 'Response to comments and reviews on the work.', Milton Campos, 06 Aug 2019
-
RC3: 'Review 2', Anonymous Referee #2, 02 Feb 2020
- AC3: 'Response', Elilson Gomes de Brito Filho, 17 Feb 2020
-
RC1: 'Review', Anonymous Referee #1, 08 Jul 2019
-
AC1: 'Response to comments and reviews on the work.', Milton Campos, 06 Aug 2019
-
RC2: 'Response to response', Anonymous Referee #1, 17 Oct 2019
- AC2: 'Response', Elilson Gomes de Brito Filho, 17 Feb 2020
-
RC2: 'Response to response', Anonymous Referee #1, 17 Oct 2019
-
AC1: 'Response to comments and reviews on the work.', Milton Campos, 06 Aug 2019
-
RC3: 'Review 2', Anonymous Referee #2, 02 Feb 2020
- AC3: 'Response', Elilson Gomes de Brito Filho, 17 Feb 2020
Viewed
HTML | XML | Total | BibTeX | EndNote | |
---|---|---|---|---|---|
726 | 323 | 93 | 1,142 | 96 | 95 |
- HTML: 726
- PDF: 323
- XML: 93
- Total: 1,142
- BibTeX: 96
- EndNote: 95
Viewed (geographical distribution)
Country | # | Views | % |
---|
Total: | 0 |
HTML: | 0 |
PDF: | 0 |
XML: | 0 |
- 1