${\mathrm{\Delta C\backslash /mi\mathrm{B\backslash /mi\backslash /msup\backslash /mrow\backslash /math\; =\; annual\; change\; in\; carbon\; stocks\; in\; biomass\; (the\; sum\; of\; above-ground\; and\; below-ground\; biomass\; terms\; in\; Equation\; 2.3\; )\; in\; land\; remaining\; in\; the\; same\; category\; (e.g.,\; Forest\; Land\; Remaining\; Forest\; Land),\; tonnes\; C\; yr-1\backslash /sup\backslash /p\backslash nC\/mit\/mi2\/mn\/msub\/msub\/mrow\/math = total carbon in biomass for each land sub-category at time t2\/sub, tonnes C\/p\nC\/mit\/mi1\/mn\/msub\/msub\/mrow\/math = total carbon in biomass for each land sub-category at time t1\/sub, tonnes C\/p\nC\/mi\/mrow\/math = total carbon in biomass for time t1\/sub to t2\/sub\/p\nA\/mi\/mrow\/math = area of land remaining in the same land-use category, ha (see note below)\/p\nV\/mi\/mrow\/math = merchantable growing stock volume, m3\/sup ha-1\/sup\/p\ni\/mi\/mrow\/math = ecological zone i (i\/mrow\/math = 1 to n)\/p\nj\/mi\/mrow\/math = climate domain j (j\/mrow\/math = 1 to m)\/p\nR\/mi\/mrow\/math = ratio of below-ground biomass to above-ground biomass, tonne d.m. below-ground biomass (tonne d.m. above-ground biomass)-1\/sup\/p\nCF\/mi\/mrow\/math = carbon fraction of dry matter, tonne C (tonne d.m.)-1\/sup\/p\nBCEF\/miS\/mi\/msub\/mrow\/math = biomass conversion and expansion factor for expansion of merchantable growing stock volume to above-ground biomass, tonnes above-ground biomass growth (m3\/sup growing stock volume)-1, (see Table 4.5 for Forest Land). BCEFS\/sub transforms merchantable volume of growing stock directly into its above-ground biomass. BCEFS\/sub values are more convenient because they can be applied directly to volume-based forest inventory data and operational records, without the need of having to resort to basic wood densities (D). They provide best results, when they have been derived locally and based directly on merchantable volume. However, if BCEFS\/sub values are not available and if the biomass expansion factor (BEFS\/sub) and D values are separately estimated, the following conversion can be used:\/p\nBCEF\/miS\/mi\/msub\/mrow\/math = BEFS\/sub \u25cf D\/p","notes":null,"sortOrder":"4.2.8","uncertainty":null,"unIpccTier1":0,"unIpccTier2":0,"unIpccTier3":0,"url":"http:\/\/www.ipcc-nggip.iges.or.jp\/public\/2006gl\/vol4.html","hasMetrics":true}}}}}^{}$