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Historical trends and drivers of the laterally transported terrestrial dissolved organic carbon to river systems

Historical trends and drivers of the laterally transported terrestrial dissolved organic carbon to river systems

Dissolved organic carbon (DOC) represents a critical component of terrestrial carbon (C) cycling and is a key contributor to the carbon flux between land and aquatic systems. Historically, the quantification of environmental factors influencing DOC leaching has been underexplored, with a predominant focus on land use changes as the main driver. In this study, the process-based terrestrial ecosystem model JULES-DOCM was utilized to simulate the spatiotemporal patterns of DOC leaching into the global river network from 1860 to 2010. This study reveals a 17 % increment in DOC leaching to rivers, reaching 292 Tg C yr−1 by 2010, with atmospheric CO2 fertilization identified as the primary controlling factor, significantly enhancing DOC production and leaching following increased vegetation productivity and soil carbon stocks. To specifically quantify the contribution of CO2 fertilization, a factorial simulation approach was employed that isolated the effects of CO2 from other potential drivers of change.

The research highlights distinct regional responses. While globally CO2 fertilization is the dominant factor, in boreal regions, climate change markedly influences DOC dynamics, at times exceeding the impact of CO2. Temperate and sub-tropical areas exhibit similar trends in DOC leaching, largely controlled by CO2 fertilization, while climate change showed an indirect effect through modifications in runoff patterns. In contrast, the tropics show a relatively low increase in DOC leaching, which can be related to alterations in soil moisture and temperature.

Additionally, the study re-evaluates the role of land use change in DOC leaching, finding its effect to be considerably smaller than previously assumed. These insights emphasize the dominant roles of CO2 fertilization and climate change in modulating DOC leaching, thereby refining our understanding of terrestrial carbon dynamics and their broader implications on the global C budget.

Historical trends and drivers of the laterally transported terrestrial dissolved organic carbon to river systems

Forest carbon stock development following extreme drought-induced dieback of coniferous stands in Central Europe: a CBM-CFS3 model application

We analyze the forest carbon stock development following the recent historically unprecedented dieback of coniferous stands in the Czech Republic. The drought-induced bark-beetle infestation resulted in record-high sanitary logging and total harvest more than doubled from the previous period. It turned Czech forestry from a long-term carbon sink offsetting about 6% of the country’s greenhouse gas emissions since 1990 to a significant source of CO2 emissions in recent years (2018–2021). In 2020, the forestry sector contributed nearly 10% to the country’s overall GHG emissions. Using the nationally calibrated Carbon Budget Model of the Canadian Forest Sector (CBM-CFS3) at a regional (NUTS3) spatial resolution, we analyzed four scenarios of forest carbon stock development until 2070. Two critical points arise: the short-term prognosis for reducing current emissions from forestry and the implementation of adaptive forest management focused on tree species change and sustained carbon accumulation.

Historical trends and drivers of the laterally transported terrestrial dissolved organic carbon to river systems

D9.1 Concept of the ForestNavigator Portal

This report presents the conceptualization of the ForestNavigator portal and its components, namely the “Data Repository”, “Model Repository” and “Computing module”. These three components (together referred to as the platform) will host the data, models, and source codes from the ForestNavigator project, as well as workflows for data processing and model deployment. This platform will allow ForestNavigator researchers and external researchers to interoperate shared data and models, to reduce modelling cycles, and to increase the outreach of the project.

Historical trends and drivers of the laterally transported terrestrial dissolved organic carbon to river systems

D10.2 Communication materials and tools

This report describes the complete set of communication materials and tools for the ForestNavigator project, including the public website (V1.0). The tools will support the communication activities to raise the awareness among the general public, to reach out to the main stakeholder groups of the project and widely distribute project results to different target audiences.

Historical trends and drivers of the laterally transported terrestrial dissolved organic carbon to river systems

D1.1 Report on stakeholder mapping and internal stakeholder database

Deliverable D1.1 of the Horizon Europe ForestNavigator project presents the report on stakeholder mapping and internal stakeholder database. The report describes the mapping process and outcomes as well as the dynamic internal stakeholder database. ForestNavigator identifies and maps stakeholders from the sub-national to the international scale based on a set of characteristics, such as stakeholder category, geographical scope, and sociodemographic factors. The aim of the mapping process is to provide a comprehensive and diverse stakeholder base for stakeholder engagement activities throughout the project. The report further describes the dynamic stakeholder database, which will be updated throughout the project lifetime.

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Historical trends and drivers of the laterally transported terrestrial dissolved organic carbon to river systems

1st Stakeholder Workshop June 2023

This workshop report summarizes the key findings and insights from the first ForestNavigator stakeholder workshop. The first workshop of a series brought together stakeholders from various fields and consortium members, establishing a key stakeholder group for the project.

Historical trends and drivers of the laterally transported terrestrial dissolved organic carbon to river systems

3rd Policy Steering Committee Meeting Sept. 2023

During the annual ForestNavigator consortium meeting, members of the Policy Steering Committee (PSC) gave an update on important forestry policy developments at the EU level, and in two of the ForestNavigator case study countries Ireland and Sweden. They also provided relevant feedback for ForestNavigator work discussed during the annual consortium meeting.

Historical trends and drivers of the laterally transported terrestrial dissolved organic carbon to river systems

2nd Policy Steering Committee Meeting April 2023

Key outputs of the project were presented to the PSC. First, the consortium aims to fill data gaps for EU-wide forest monitoring and modeling. The forest monitoring data and layers to be included in the first version of the EU forest geodatabase, should be consistent across the EU, spatially distributed and high-resolution, timely, comprehensive, and transparent.