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Carbon stock in slash-and-burn and alternative land uses at ASB Benchmark sites in the humid tropics

Federal Geographic Data Committee (FGDC) Metadata:


Identification_Information:
Citation:
Citation_Information:
Originator: Consultative Group on International Agricultural Research (CGIAR)
Publication_Date: Unknown
Title: Carbon stock in slash-and-burn and alternative land uses at ASB Benchmark sites in the humid tropics
Edition:
Geospatial_Data_Presentation_Form:
Series_Information:
Series_Name:
Issue_Identification:
Publication_Information:
Publication_Place:
Publisher:
Other_Citation_Details:
Online_Linkage:
Description:
Abstract:
Carbon stocks were measured in the soils and vegetation in 94 sites in the three ASB benchmark countries (Brazil, Cameroon, Indonesia) and in an additional 22 sites in PerĂº. The sites sampled in each country included undisturbed or selectively logged forests as the reference point; areas that had been recently slashed, burned, and cropped; and areas that were subsequently planted to pastures, tree plantations or agroforests, or areas abandoned to fallow regrowth. This dataset, compiled by the ASB benchmark team, is unique in that it provides data collected and analyzed by standardized methods across sites. In addition, the information in this dataset on the carbon stocks and carbon accumulation rates in young fallow vegetation and agroforestry and plantation systems are rare for the tropics.
Purpose:
Not Available
Supplemental_Information:
Not Available
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 20000101
Ending_Date: 20001231
Currentness_Reference:Unknown
Status:
Progress: In Work
Maintenance_and_Update_Frequency: As needed
Spatial_Domain:
Description_of_Geographic_Extent:
Bounding_Coordinates:
West_Bounding_Coordinate: 10.0
East_Bounding_Coordinate: 55.0
North_Bounding_Coordinate: 12.0
South_Bounding_Coordinate: -55.0
Keywords:
Theme:
Theme_Keyword_Thesaurus: GCMD SCIENCE PARAMETERS
Theme_Keyword_Thesaurus: ANCILLARY KEYWORDS
Theme_Keyword_Thesaurus: ISO TOPIC CATEGORY
Theme_Keyword_Thesaurus: DATA SET LANGUAGE
Theme_Keyword: EARTH SCIENCE > LAND SURFACE > SOILS > CARBON
Theme_Keyword: Slash And Burn
Theme_Keyword: Carbon Stock
Theme_Keyword: Land Uses
Theme_Keyword: Benchmark Sites
Theme_Keyword: Humid Tropics
Theme_Keyword: BIOTA
Theme_Keyword: ENGLISH
Place:
Place_Keyword_Thesaurus: GCMD
Place_Keyword: CONTINENT > AFRICA > CENTRAL AFRICA > CAMEROON
Place_Keyword: OCEAN > INDIAN OCEAN > INDONESIA
Place_Keyword: CONTINENT > SOUTH AMERICA > BRAZIL
Place_Keyword: CONTINENT > SOUTH AMERICA > PERU
Access_Constraints: ASB encourages free dissemination of its work when reproduction and use are for non-commercial purposes, provided all sources are acknowledged. ASB strives for open, public access to its datasets and will consider requests for access to ASB datasets on a case-by-case basis in consultation with the ASB Consortium partners who generated the data.
Use_Constraints:
None
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: JOYCE KASYOKI
Contact_Position: TECHNICAL CONTACT
Contact_Address:
Address_Type: Mailing and Physical Address
Address: ASB Programme
Address: ICRAF
Address: P.O. Box 30677
City: Nairobi
Country: Kenya
Contact_Voice_Telephone: +254 2 524139/524000 0r +1 650 833 6645
Contact_Facsimile_Telephone: +254 2 524001 or +1 650 833 6646
Contact_Electronic_Mail_Address: asb@cgiar.org
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Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
The current dataset allows for general comparison of C stocks and time-averaged C values among general land-use types, but some caution must be taken in using these estimates. There are several steps in which errors may affect the accuracy of the estimates. These include small plot sizes for estimating the biomass of large trees, insufficient numbers of replicates, and inappropriate allometric equations for estimating tree biomass for some of the systems. The total area sampled for tree biomass at each site was 500 m2 (= quadrat size (00m2) multiplied by five (quadrats per site). Although this may be sufficient in areas where trees are small, < 25 cm diameter at breast height (dbh), it is much less than the 2,500 m2 recommended by Brown et al., (1995) for obtaining accurate measurements in tropical forests where much larger trees are encountered. The protocol has now been modified to increase the quadrat size to 5m X 100m in areas where there are trees with a dbh >25cm. The above- and below-ground C estimates for most of the land-use systems were obtained from only three or four true field site replicates (in each field site, estimates were obtained from an average of five quadrats = pseudoreplicates). In some cases the variability was quite low, but in others it was unacceptably large, and in other cases the estimates were obtained from only two field site replicates. If these C values are to be used for modeling and national inventories, then the accuracy must be improved by increasing the number of replicates. Another source of error could be related to the allometric equation used for estimating the biomass of trees based on their diameter. The current equation was developed primarily for mature forests that often included only trees greater than 10 or even 25 cm in diameter (Brown et al., 1989). In addition, the density of the wood in these mature systems may be greater than that in young, regrowing systems. There are indications that this equation may overestimate the C of trees of dbh < 25cm, which, in fact, includes most of the trees in the secondary forests, fallows, agroforestry and tree plantations measured at the ASB sites. New equations being developed based on extensive sampling of trees in young fallows (Ketterings and van Noordwijk for Indonesia and Palm and Szott for PerĂº) give estimates half those obtained from the Brown equation. Several other recent studies have shown a considerable range in allometric equations for both primary and secondary forests in the humid tropics of Brazil (Alves et al., 1997; Araujo et al., 1999; Nelson et al., 1999). Application of these new equations to young, regrowing fallow and agroforestry systems will affect carbon stock estimates and rates of C accumulation. Such systems are currently of interest to the global change community as there is debate on how much C is taken up by regrowing vegetation. Once new equations for smaller diameter trees and for specific agroforestry species have been agreed upon, then C stocks, C accumulation rates, and time-averaged C values for many of these systems can be improved relatively rapidly. In addition, since most of the C in these systems is in the trees, we would recommend sampling several more young fallows, mature or growing plantations and agroforestry systems. The tree biomass will be estimated by measuring dbh of the individual trees, noting which species, and then applying the specific allometric equations. Root sampling and estimation of the C stored in roots has proven to be the most difficult of all the parameters measured. The estimates for roots have not been included in the tables and figures presented in this report. If one assumes that the root-to-shoot ratio remains relatively constant for the different systems within a site, then there is a means of estimating the C stored in the root systems. At the very least, it is possible to say that including roots in the C stock comparisons made above will only magnify the loss of C. As an example, the roots in a plantation will be less than the roots of a forest system, as is the above-ground C, and therefore the difference in total C between the two systems is larger than, but in proportion to, that estimated by above-ground C only.
Logical_Consistency_Report:
Not Available
Completeness_Report:
Not Available
Lineage:
Process_Step:
Process_Description:
Not Available
Process_Date: Unknown
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Spatial_Reference_Information:
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Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: CGIAR/ASB > Alternate Slash and Burn, Consultative Group on International Agricultural Research
Contact_Person: JOYCE KASYOKI
Contact_Position: DATA CENTER CONTACT
Contact_Address:
Address_Type: Mailing and Physical Address
Address: ASB Programme
Address: ICRAF
Address: P.O. Box 30677
City: Nairobi
Country: Kenya
Contact_Voice_Telephone: +254 2 524139/524000 0r +1 650 833 6645
Contact_Facsimile_Telephone: +254 2 524001 or +1 650 833 6646
Contact_Electronic_Mail_Address: asb@cgiar.org
Resource_Description: CGIAR_ASB_CStock
Distribution_Liability:
Not Available
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: Not Available
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name:
http://www.asb.cgiar.org/
Access_Instructions:
DATA CENTER URL
Digital_Transfer_Option:
Fees: Not Available
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Metadata_Reference_Information:
Metadata_Date: 20060126
Metadata_Review_Date: 20160127
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: GCMD User Support Office
Contact_Organization: NASA Global Change Master Directory
Contact_Address:
Address_Type: Mailing and Physical Address
Address: Not Available
City: Lanham
State_or_Province: MD
Postal_Code: 20706
Country: USA
Contact_Voice_Telephone: Not Available
Contact_Electronic_Mail_Address: gcmduso@gcmd.gsfc.nasa.gov
Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Time_Convention: local time
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