| 1. Identity statement | |
| Reference Type | Journal Article |
| Site | mtc-m16b.sid.inpe.br |
| Holder Code | isadg {BR SPINPE} ibi 8JMKD3MGPCW/3DT298S |
| Identifier | 6qtX3pFwXQZ3r59YD9/GbkPv |
| Repository | sid.inpe.br/iris@1915/2005/05.17.19.08 (restricted access) |
| Last Update | 2005:05.17.03.00.00 (UTC) administrator |
| Metadata Repository | sid.inpe.br/iris@1915/2005/05.17.19.09.01 |
| Metadata Last Update | 2018:06.05.03.52.12 (UTC) administrator |
| Secondary Key | INPE-9080-PRE/4756 |
| ISSN | 0016-7061 |
| Citation Key | HodnettToma:2002:NeWaPe |
| Title | Marked differences between van Genuchten soil water-retention parameters for temperate and tropical soils: a new water-retention pedo-transfer functions developed for tropical soils  |
| Year | 2002 |
| Secondary Date | 20020612 |
| Month | Aug. |
| Access Date | 2024, Apr. 27 |
| Secondary Type | PRE PI |
| Number of Files | 1 |
| Size | 511 KiB |
| 2. Context | |
| Author | 1 Hodnett, M. G. 2 Tomasella, Javier |
| Resume Identifier | 1 2 8JMKD3MGP5W/3C9JHE3 |
| Group | 1 CPT-INPE-MCT-BR |
| Affiliation | 1 CPTEC-INPE-Cachoeira Paulista-12630-000-SP-Brasil |
| e-Mail Address | atus@cptec.inpe.br |
| Journal | Geoderma |
| Volume | 108 |
| Number | 3-4 |
| Pages | 155-180 |
| History (UTC) | 2005-05-17 19:09:01 :: fabia -> administrator :: 2008-06-10 19:51:53 :: administrator -> estagiario :: 2010-05-11 16:55:58 :: estagiario -> administrator :: 2018-06-05 03:52:12 :: administrator -> marciana :: 2002 |
| 3. Content and structure | |
| Is the master or a copy? | is the master |
| Content Stage | completed |
| Transferable | 1 |
| Content Type | External Contribution |
| Keywords | meteorologia solos regiões tropicais funções de transferência ciência de solos soils tropical regions soil science tranfer functions |
| Abstract | All of the physical, chemical and soil water-retention data suitable for the derivation of a Pedo-Transfer Functions (PTF)for water retention for tropical soils (771 suitable horizons)were extracted from the IGBP-DIS soil database. The parameters theta(s), theta(r), alpha and n of the van Genuchten (vG)[Soil Sci. Soc. Am. J. 44 (1980)892]equation were derived and compared with parameter values from two published data sets of temperate region soils. Thirty-five percent of the soils in the tropical (IGBP/T)database were classified as clays, compared with only 4 and 7 in the temperate databases. The IGBP/T soil bulk densities were significantly lower (p<0.001)for nine textural classes. For the more clayey textural classes, the value of alpha; was higher for the IGBP/T soils, implying more large pores and more structure. For kaolinitic soils in the IGBP/T database, alpha; was typically around 0.4 kPa(-1)compared with 0.04 kPa(-1)for montmorillonitic soils. Mineralogy is clearly important and should be included in PTFs (if available). The value of n for clay soils in the IGBP/T data set was significantly higher than for temperate soils, and theta;(s)was significantly higher for nine textural classes (p < 0.001)reflecting their lower bulk density. theta(r)was also significantly higher for all textural classes except sand. For clay, the mean value of theta(r)was 0.27 m(3)m(-3), compared to only 0.11 m(3)m(-3)for temperate soils. For 17 of the IGBP/T data, theta(r)exceeded 0.3 m(3)m(-3), a value often used as a fitting constraint. A tropical soil PTF was developed using multiple regression techniques. This predicted water-retention curves more reliably than either class PTFs or "soil class" PTFs, but was not reliable for low-density soils such as Andosols. The IGBP/T data set includes some groups of soils, e.g., Andosols and Ferralsols, whose properties are extremely different from those of most temperate soils. These differences emphasise the need to develop separate PTFs for tropical soils, or perhaps for specific groups of soils. There were few water-retention data from below 1.5-m depth and a complete lack of hydraulic conductivity data in the IGBP/T database. This is a major impediment to the modelling of water movement and uptake in deep-rooted ecosystems, for example, tropical forest and savannah. |
| Area | MET |
| Arrangement | urlib.net > BDMCI > Fonds > Produção anterior à 2021 > CGCPT > Marked differences between... |
| doc Directory Content | access |
| source Directory Content | there are no files |
| agreement Directory Content | there are no files |
| 4. Conditions of access and use | |
| Language | en |
| Target File | Hodnett_Marked differences between.pdf |
| User Group | administrator fabia |
| Visibility | shown |
| Copy Holder | SID/SCD |
| Archiving Policy | denypublisher denyfinaldraft24 |
| Read Permission | deny from all and allow from 150.163 |
| 5. Allied materials | |
| Next Higher Units | 8JMKD3MGPCW/3EUPEJL |
| Dissemination | WEBSCI |
| Host Collection | cptec.inpe.br/walmeida/2003/04.25.17.12 |
| 6. Notes | |
| Empty Fields | alternatejournal archivist callnumber copyright creatorhistory descriptionlevel documentstage doi electronicmailaddress format isbn label lineage mark mirrorrepository nextedition notes orcid parameterlist parentrepositories previousedition previouslowerunit progress project readergroup rightsholder schedulinginformation secondarymark session shorttitle sponsor subject tertiarymark tertiarytype typeofwork url versiontype |
| 7. Description control | |
| e-Mail (login) | marciana |
| update | |