Inventory of Organic Carbon in a Pterogyne nitens Tul. Plantation in Southwest Bahia, Brazil

ABSTRACT Carbon binding capacity varies between forest plantations, mainly in terms of species and climate and soil conditions. The objective of this study was to estimate the amount of organic carbon stored in aerial tree biomass in the litter and soil of a homogeneous planting of Pterogyne nitens Tul. located in the Southwest Bahia region of Brazil. The woody biomass was obtained by destructive method. Litter collection was carried out using a wooden template (0.25 m2). Soil samples were collected at four depths (0-5, 5-10, 10-20 and 20-40 cm). The carbon stored in all studied compartments totaled 47.1 Mg ha-1 with a greater contribution from the ground (31.4 t ha-1). The accumulated litter was the lowest carbon compartment, storing about 1.4% of the total. Among the different fractions of the biomass, the stem is the largest carbon reservoir, representing about 46% of fixed C biomass.

摘要：人工林的固碳能力因树种、气候及土壤条件的差异而存在显著不同。本研究以巴西巴伊亚州西南部的一片亮籽翼豆（Pterogyne nitens Tul.）人工纯林为研究对象，旨在估算其林木地上生物量、枯落物及土壤中固存的有机碳储量。木本生物量采用破坏性取样法获取；枯落物采集使用面积为0.25 m²的木质样框完成；土壤样品按0-5 cm、5-10 cm、10-20 cm及20-40 cm四个土层深度采集。各研究组分固存总碳储量达47.1 Mg·ha⁻¹，其中土壤贡献占比最高，为31.4 t·ha⁻¹。累积枯落物是固碳量最低的组分，其固存碳量约占总储量的1.4%。在生物量的不同组分中，树干是最大的碳库，约占固定碳生物量的46%。