> For the complete documentation index, see [llms.txt](https://isbm.savimbo.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://isbm.savimbo.com/methodology/zh-cn/xiang-mu-miao-shu/fu-jia-xing.md).

# 附加性

本方法学的一般附加性必须通过适用现行版本 Cercarbono 的决策树加以证明， [生物多样性认证计划议定书](https://www.cercarbono.com/biodiversity-certification-programme/) 该决策树涵盖财务、规范和监管方面的超额附加性情形，以证明生物多样性保护与项目活动直接相关，而非源自外部来源。

本方法学对通过方法学衡量的行动附加性作了简化处理，以便纳入 IP 和 LC。

本方法学从其他物种的视角评判结果。人类可能对退化生态系统作出边际改善，且对于严重退化生态系统，这种改善幅度当然可能达到 200％，甚至 300％。然而，恢复后的生态系统永远无法像未受扰动生态系统那样，为全部本地物种群落提供完全可获得的环境。 

因此，对于发生在高生物多样性、高威胁生态系统中的项目，附加性内在于 [生态系统特征界定](/methodology/zh-cn/ji-xian-ping-gu/ji-xian-sheng-tai-xi-tong-fen-lei.md) 与 [价值归一化](/methodology/zh-cn/ji-suan/jia-zhi-ji-suan.md)。例如，任何列入 IUCN 红色名录的完整生态系统，或生物多样性热点生态系统，均因其受威胁状态而天然具有附加性。 

BCP 区域的 [完整性计算](/methodology/zh-cn/ji-suan/wan-zheng-xing-ji-suan.md) 在本方法学中，旨在确立受保护生态系统的可接受证明。因此，与其为变化提供证据，不如为无变化提供合理证据，而在受威胁生态系统中，无变化本身即具有附加性。 

在保护情境下，外部来源已确认某一生态系统处于威胁之中，附加性仅需证明项目维持了生物多样性的存在，且相关活动未被其他来源重复实施。


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