REDD Methodological Module. Estimation of carbon stocks in the soil organic carbon pool CP-S

Transcription

1 CP-S - 1 REDD Mehodological Module Esimaion of carbon socks in he soil organic carbon pool CP-S Version June 2010 I. SCOPE, APPLICABILITY AND PARAMETERS Scope This module allows for esimaion of carbon socks in soil organic carbon in he baseline case (for boh pre- and pos-deforesaion socks) and projec case. Uncerainy of esimaes is reaed in module X-UNC. Idenificaion of baseline (pos-deforesaion) land-uses is reaed in modules BL-UP and BL-PL. Applicabiliy This module is applicable o non-organic soils under all fores ypes and age classes. This module is applicable if he soil organic carbon pool is included as par of he projec boundary as per applicabiliy crieria in he framework module REDD-MF, specifically: Soil organic carbon shall be included if socks are greaer, or are increasing a a greaer rae, in he baseline han in he projec scenario. Ex ane deerminaion ha socks are greaer in he baseline han in he projec scenario can be made on he basis of IPCC 2006GL Relaive Sock Change Facors (F LU, F MG, and F I ) 1 if he average combined sock change facor for he baseline (area-weighed by pos conversion landuse) is greaer han or equal o 1, hen soil organic carbon mus be included, oherwise i can be conservaively omied, and Soil organic carbon shall be included if deermined o be significan (using he T-SIG module). Parameers This module produces he following parameers: Parameer SI Uni Descripion C SOC,i, CO 2 -e ha -1 Mean carbon sock in soil organic carbon in sraum i a ime 1 hp://

2 CP-S - 2 C SOC,PD-BSLi, CO 2 -e ha -1 Mean pos-deforesaion sock in soil organic carbon in he pos deforesaion baseline sraum i, a ime ; II. PROCEDURES Frequency of measuremen for soil organic carbon socks s of iniial socks employed in he baseline mus ake place wihin 5 years prior o he projec sar dae, for simpliciy referred o here as socks a =0. Soil organic carbon sock esimaes are valid in he baseline (i.e. reaed as consan) for 10 years, afer which hey mus be re-esimaed from new field measuremens. For each sraa, where he re-measured esimae is wihin he 90% confidence inerval of he =0 esimae, he =0 sock esimae akes precedence and is re-employed, and where he re-measured esimae is ouside (i.e. greaer han or less han) he 90% confidence inerval of he =0 esimae, he new sock esimae akes precedence and is used for he subsequen period. Par 1: Ex ane esimaion of pre-deforesaion socks of soil organic carbon The procedure o be followed in he measuremen of soil organic carbon is oulined below. Sraa employed for soil organic carbon will conform o he same sraa employed for all oher included pools. To esimae he carbon sock in soil organic carbon per uni area for sample plo sp, sraum i, a ime : C C BD * Dep *100 (1) SOCsp, i, SOCsamplesp,, i, * sample, sp, i, sample, sp, i, where: C SOCsp,i, Carbon sock in soil organic carbon for sample plo sp, sraum i, a ime ; C ha -1 C SOCsample,sp,i, Soil organic carbon of he sample in sample plo sp, sraum i, a ime ; deermined in he laboraory in g C/100 g soil (fine fracion <2 mm) BD sample,sp,i, Bulk densiy of fine (<2 mm) fracion of mineral soil in sample plo sp, sraum i, a ime ; deermined in he laboraory in g fine fracion cm -3 oal sample volume

3 CP-S - 3 Dep sample,sp,i, sp i Deph o which soil sample is colleced in sample plo sp in sraum i a ime ; cm 1, 2, 3 P i sample plos in sraum i 1, 2, 3 M sraa 0, 1, 2, 3 years elapsed since he sar of he projec aciviy To esimae he mean carbon sock in soil organic carbon, convered o carbon dioxide equivalens, per uni area for sraum i, a ime : (2) Where: C SOC,i, Mean carbon sock in soil organic carbon for sraum i, a ime ; CO 2 -e ha -1 C SOCsp,i, Carbon sock in soil organic carbon for sample plo sp, sraum i, a ime ; C ha -1 sp i 1, 2, 3 P i sample plos in sraum i 1, 2, 3 M sraa 0, 1, 2, 3 years elapsed since he sar of he projec aciviy 44/12 Raio of molecular weigh of CO 2 o carbon, CO 2 -e C -1 Par 2: Ex ane esimaion of pos-deforesaion socks of soil organic carbon Pos-deforesaion soil carbon socks are assumed o be he long-erm average socks on he land following deforesaion. To esimae his long erm average pos-deforesaion sock of soil organic carbon, he mean soil sock esimaed in Par 1 a =0 is muliplied by he sock change facors, equal o he carbon sock in he alered condiion as a proporion of he reference

4 CP-S - 4 carbon sock as defined in IPCC 2006GL2. This mehod assumes ha changes will ake place over 20 years and is assumed o equae o he long erm average socks. - Where: (3) C SOC,PD-BSLi, Mean pos-deforesaion sock in soil organic carbon in he pos deforesaion baseline sraum i, a ime ; CO 2 -e ha -1 C SOC,i,=0 Mean carbon sock in soil organic carbon for sraum i, a ime =0; CO 2 - e ha -1 F LU F MG F I i land use facor before or afer conversion; dimensionless managemen facor before or afer conversion; dimensionless inpu facor before or afer conversion; dimensionless 1, 2, 3 M sraa 1, 2, 3 years elapsed in he baseline III. DATA AND PARAMETERS NOT MONITORED (DEFAULT OR POSSIBLY MEASURED ONE TIME) Daa uni: Dep sample cm Used in equaions: 1 Deph in cm o which soil sample is colleced Core dimensions recorded in he field Deph of sampling for soil organic carbon is cenered on he upper soil horizons where roo biomass and organic maer inpus are concenraed, depending on soil ype and ecosysem, ypically beween 20 cm and 100 cm. Deph of soil sampling employed in invenories is held consan for he duraion of he projec. 2 hp://

5 CP-S - 5 Daa uni: F LU Dimensionless Used in equaions: 3 Land use facor before or afer conversion Sock Change Facors are provided in Tables 5.5, 5.10, and 6.2 of he IPCC 2006GL Volume 4 Sock Change Facors as defined in IPCC 2006GL are equal o he carbon sock in he alered condiion as a proporion of he reference carbon sock. Sock Change Facors mus be seleced o reflec he circumsances mos closely maching hose of he projec area and baseline scenario, especially regarding climae and pos-conversion land-use, aking ino accoun managemen pracices and carbon inpus (e.g. manure). Daa uni: F MG Dimensionless Used in equaions: 3 Managemen facor before or afer conversion Sock Change Facors are provided in Tables 5.5, 5.10, and 6.2 of he IPCC 2006GL Volume 4 Sock Change Facors as defined in IPCC 2006GL are equal o he carbon sock in he alered condiion as a proporion of he reference carbon sock. Sock Change Facors mus be seleced o reflec he circumsances mos closely maching hose of he projec area and baseline scenario, especially regarding climae and pos-conversion land-use, aking ino accoun managemen pracices and carbon inpus (e.g. manure).

6 CP-S - 6 Daa uni: F I Dimensionless Used in equaions: 3 Inpu facor before or afer conversion Sock Change Facors are provided in Tables 5.5, 5.10, and 6.2 of he IPCC 2006GL Volume 4 Sock Change Facors as defined in IPCC 2006GL are equal o he carbon sock in he alered condiion as a proporion of he reference carbon sock. Sock Change Facors mus be seleced o reflec he circumsances mos closely maching hose of he projec area and baseline scenario, especially regarding climae and pos-conversion land-use, aking ino accoun managemen pracices and carbon inpus (e.g. manure). IV. DATA AND PARAMETERS MONITORED Daa uni: C SOCsample g C/100 g soil (fine fracion <2 mm) Used in equaions: 1 Soil organic carbon of he sample in g C/100 g soil Field sampling and laboraory deerminaion For soil carbon deerminaion, an aggregae sample (e.g. from 4 sysemaically-disribued cores) is colleced from wihin a sample plo in he field, horoughly mixed and sieved hrough a 2 mm sieve. The prepared sample is analyzed for percen organic carbon using eiher dry combusion using a conrolled-emperaure furnace (e.g. LECO CHN- 2000, LECO RC-412 muli-carbon analyzer, or equivalen), dichromae oxidaion wih heaing, or Walkley-Black mehod.

7 CP-S - 7 Furher guidance is provided in he IPCC 2003 GPG-LULUCF and in Nelson, D.W., and L.E. Sommers Toal carbon, organic carbon, and organic maer. p In A.L. Page e al. (ed.) Mehods of soil Analysis. Par 2. 2nd ed. Agron. Monogr. 9. ASA and SSSA, Madison, WI. Pearson, T., Walker, S. and Brown, S Sourcebook for Land Use, Land-Use Change and Foresry Projecs. Winrock Inernaional and he World Bank Biocarbon Fund. 57pp. Available a: hp:// BioCarbon_Fund_Sourcebook-compressed.pdf Monioring frequency: QA/QC procedures: Where soil organic carbon is an included pool monioring mus occur a leas every en years for baseline renewal. Where carbon sock enhancemen is included and soil organic carbon is an included pool monioring shall occur a leas every five years Sandard qualiy conrol / qualiy assurance (QA/QC) procedures for fores invenory including field daa collecion and daa managemen shall be applied. Use or adapaion of QA/QCs already applied in naional fores monioring, or available from published handbooks, or form he IPCC GPG LULUCF 2003, is recommended. BD sample Daa uni: g cm -3 Used in equaions: 1 Bulk densiy of fine (< 2 mm) fracion of mineral soil per uni volume of sample in g cm -3 ; bulk densiy equals he oven dry weigh of he fine fracion (< 2 mm) of he soil core divided by he core volume Field sampling and laboraory deerminaion For bulk densiy deerminaion, samples (cores) of known volume are colleced in he field and oven dried o a consan weigh a 105 o C (for a minimum of 48 hours). The oal sample is hen weighed, hen any coarse rocky fragmens (>2 mm) are sieved and weighed separaely. The bulk densiy of he soil core is esimaed as:

8 CP-S - 8 BD sample ODW CV RF Where: BD = sample Bulk densiy of he < 2mm fracion, in grams per cubic cenimeer (g/cm 3 ) ODW = Oven dry mass oal sample in grams CV = Core volume in cm 3 RF = Mass of coarse fragmens (> 2 mm) in grams Noe ha volume includes coarse (>2mm) fragmens. Because coarse rocky fragmens occupy space in he soil profile in which carbon is no sored, discouning his volume as in radiional bulk densiy calculaions would overesimae soil carbon socks when applied o a volume ha does no disinguish beween coarse and fine fracions. Furher guidance is provided in he IPCC 2003 GPG-LULUCF and in Nelson, D.W., and L.E. Sommers Toal carbon, organic carbon, and organic maer. p In A.L. Page e al. (ed.) Mehods of soil Analysis. Par 2. 2nd ed. Agron. Monogr. 9. ASA and SSSA, Madison, WI. Pearson, T., Walker, S. and Brown, S Sourcebook for Land Use, Land-Use Change and Foresry Projecs. Winrock Inernaional and he World Bank Biocarbon Fund. 57pp. Available a: hp:// BioCarbon_Fund_Sourcebook-compressed.pdf Monioring frequency: QA/QC procedures: Where soil organic carbon is an included pool monioring mus occur a leas every en years for baseline renewal. Where carbon sock enhancemen is included and soil organic carbon is an included pool monioring shall occur a leas every five years Sandard qualiy conrol / qualiy assurance (QA/QC) procedures for fores invenory including field daa collecion and daa managemen shall be applied. Use or adapaion of QA/QCs already applied in naional fores monioring, or available from published handbooks, or form he IPCC GPG LULUCF 2003, is recommended.

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