Forest degradation: it is not a matter of new definitions

Abstract

We argue that a "universal" definition of forest degradation per se is neither necessary nor desirable in the context of Reduced Emissions from Deforestation and Degradation (REDD) activities under the UNFCCC. In 2003, the ninth meeting of the Conference of the Parties to the UNFCCC adopted a global definition of forest degradation as "direct human induced long-term loss (persisting for X years or more) of at least Y% of forest carbon stocks (and forest values) since time (T) and not qualifying as deforestation" (Penman et al. 2003). Making this definition operational has been problematic ever since mostly because both X and Y have proven difficult to operationalize (Penman 2008). It is very likely that a definition on degradation will never be agreed upon in the context of UNFCCC negotiations as scientists and other stakeholders have yet to agree on what is a forest and what constitutes being degraded. They seem more successful, however, at defining gradients or progression of degradation in space and time (see Table S1). The emphasis should thus be on monitoring persistent declines of carbon stocks over time, based on the IPCC methodologies, and stratified for different activities that remove carbon from the forest and assuming no overall loss of forest cover (see, e.g., GOFC-GOLD 2008; Murdiyarso et al. 2008). The main challenge is obviously to adequately define baseline carbon stocks and monitor their change over time (i.e., the carbon accounting period) to assess decline. Sasaki & Putz (2009) rightly advocate the use of remote sensing for monitoring carbon removal via selective timber harvesting over large areas.Yet quantifying carbon removal through "cryptic" (yet spatially pervasive) degradation such as low-intensity timber harvesting, fuelwood collection, small-scale mining, and understory thinning (Peres et al. 2006) will have to rely on direct monitoring. From the perspective of REDD activities we need to measure and monitor changes in carbon stocks over the landscape, accurately and cost-effectively enough, in order to detect changes. We agree with Sasaki & Putz (2009) that erosion of biodiversity and provision of ecosystem services in any REDD scheme should not be overlooked; but we do not have to worry now about new definitions of forest degradation. Furthermore, setting the minimum crown cover value to 40% as the authors suggest, may do little in making cryptic degradation go unnoticed.