The oxalate-carbonate pathway (OCP) allows atmospheric carbon dioxide (CO₂atm) sequestration through deposition of CaCO₃ in soils. The participation of Brosimum alicastrum Sw. (Moracea) in the OCP has been demonstrated in traditional Maya agroforesty systems (homegardens) in Yucatan, Mexico, but remains unstudied in wild vegetation. To compare the OCP role of B. alicastrum trees associated to homegardens and forest, the calcium oxalate (CaC₂O₄) content of leaves, bark, roots, and adjacent soil of 40 trees was measured, as well as the abundance of soil and rizospheric oxalothropic bacteria. The highest CaC₂O₄ contents were present in leaves (45.37 g kg^–1) and adjacent soil (576.93 mg kg^–1) of wild trees. Oxalotrophic bacteria abundance was higher in the rhizospheric soil associated to wild trees. Soil CaC₂O₄ content was positively correlated to soil Ca (r_s = .911; p < .01) and CaCO₃ (r_s = .885; p < .01) contents in wild trees and negatively correlated to soil redox potential (r_s = –.625; p = .02). The CaC₂O₄ contents and oxalotrophic bacteria abundance in soils indicate an active participation of B. alicastrum trees in the OCP in both systems, allowing the capture of CO₂atm. The lower potential to sequester CO₂ in homegardens is mainly due to the use of the B. alicastrum as forage, which prevents the addition of litter to soil. If trees in homegardens were not defoliated, the amount of CO₂atm captured by B. alicastrum in these systems would be greater than those in forest because the tree density in homegardens can be up to 18 times greater than in forest.

中文翻译：

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喀斯特自家园和森林土壤中金银花草酸盐-碳酸盐途径的差异

草酸盐-碳酸盐途径 (OCP) 允许通过在土壤中沉积 CaCO ₃来封存大气中的二氧化碳 (CO ₂ atm) 。Brosimum alicastrum Sw的参与。(Moracea) 在 OCP 中已在墨西哥尤卡坦的传统玛雅农林系统（家庭花园）中得到证明，但仍未在野生植被中进行研究。为了比较与家庭花园和森林相关的B. alicastrum树的 OCP 作用，测量了 40 棵树的叶子、树皮、根和相邻土壤的草酸钙 (CaC ₂ O ₄ ) 含量，以及土壤和土壤的丰度。根际草食细菌。CaC ₂ O ₄最高含量存在于野生树木的叶子 (45.37 g kg ^–1 ) 和相邻土壤 (576.93 mg kg ^–1 ) 中。与野生树木相关的根际土壤中的草酸营养菌丰度更高。土壤 CaC ₂ O ₄含量与土壤 Ca ( r _s  = .911; p  < .01) 和 CaCO ₃ ( r _s  = .885; p  < .01) 含量呈正相关，与土壤氧化还原电位呈负相关( r _s  = –.625; p  = .02)。CaC ₂ O ₄土壤中草酸营养细菌的含量和丰度表明B. alicastrum树在两个系统的 OCP 中都积极参与，从而可以捕获 CO ₂ atm。在家庭花园中封存 CO _{2 的}潜力较低主要是由于使用B. alicastrum作为草料，这防止了向土壤中添加垃圾。如果家庭花园中的树木没有落叶，这些系统中B. alicastrum捕获的 CO ₂ atm量将比森林中的大，因为家庭花园中的树木密度可能是森林中的 18 倍。