Carbon stock in the development of different designs of biodiverse agroforestry systems

ABSTRACT The objective of this study was to estimate the carbon stock in the different designs of biodiverse agroforestry systems (AFSs) in the region of the Environmental Protection Area (EPA) of Pratigi, Bahia, Brazil. Phytosociology aspects related to the potentiality of carbon stock of 10 farms were evaluated using plots of 10 x 50 m allocated in each AFS, inventorying 928 individuals of 17 families and 37 species, established in 2013. The biomass above and below the soil of the arboreal individuals were estimated by indirect method, using specific allometric equations for each species or group of species, with diameter above 1 cm. Carbon stock (CS) was estimated from the biomass. Cacao (Theobroma cacao) and rubber tree (Hevea brasiliensis) were the dominant species in all of the designs, which also contained fruit trees, and native and exotic shade trees. There was variation of the estimate of carbon stock (8.01-1.42 Mg ha-1) between the types of AFSs. The designs with a larger relative density of fruit and shade trees led to larger carbon storage, influenced by the wealth and diversity of species in the initial phase of establishment of biodiverse AFSs.

摘要：本研究旨在评估巴西巴伊亚州普拉蒂吉环境保护区（Environmental Protection Area, EPA）内不同设计模式下的生物多样性农林业系统（Agroforestry Systems, AFSs）的碳储量。本研究针对10个农场地块，采用设置于各农林业系统内的10×50米样地开展调查，共统计了2013年建立的17科37种共928株个体，分析了与碳储量潜力相关的植物社会学（Phytosociology）特征。乔木个体的地上与地下生物量采用间接法估算，针对直径大于1厘米的各物种或物种类群，使用专属异速生长方程（allometric equations）进行计算。碳储量（Carbon Stock, CS）可通过生物量换算得到。可可树（Theobroma cacao）与巴西橡胶树（Hevea brasiliensis）为所有设计模式下的优势物种，该类农林业系统同时包含果树、本土遮荫树与外来遮荫树。不同类型的农林业系统的碳储量估算值存在差异，区间为1.42~8.01 Mg·ha⁻¹。在生物多样性农林业系统建立的初始阶段，果树与遮荫树相对密度更高的设计模式可实现更高的碳储量，这一结果受系统初期的物种丰富度与多样性影响。