G.M.J. Mohren

G.M.J. Mohren
Wageningen University & Research | WUR · Faculty of Environmental Sciences

PhD

About

279
Publications
93,482
Reads
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8,300
Citations
Additional affiliations
September 2013 - April 2017
European Forest Institute
Position
  • Board member
May 1999 - present
Wageningen University & Research
Position
  • Head
January 1999 - present
Wageningen University & Research
Position
  • Wageningen University
Description
  • Professor and Head

Publications

Publications (279)
Article
Full-text available
Climate change impacts on Europe’s forests are becoming visible much sooner than previously anticipated. The increase in natural disturbances leads to tree mortality and raises concerns about the forest’s adaptive potential to sustain vital ecosystem services. In this context, the regeneration phase is crucial and comprises the largest potential to...
Article
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Assessing the mechanisms underlying drought tolerance is important for understanding current species distribution along rainfall gradients and for predicting how species may respond to climate change. We evaluated the hypothesis that species exhibit a trade-off between drought avoidance and physiological drought tolerance and a trade-off between ra...
Article
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Forests play a key role in a bio-based economy by providing renewable materials, mitigating climate change, and accommodating biodiversity. However, forests experience massive increases in stresses in their ecological and socioeconomic environments, threatening forest ecosystem services supply. Alleviating those stresses is hampered by conflicting...
Article
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A typical case of multiple-use forest management (MFM) in Southwestern Amazon is the commercial harvesting of Amazon or Brazil nut (Bertholletia excelsa) seeds and of timber of other tree species. Although the Amazon nut is the most important non-timber forest product (NTFP) in the Amazon basin, the species is under serious threat due to deforestat...
Article
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De Bossenstrategie vraagt aandacht voor de rol van vlaktekap in het bosbeheer. Het toepassen van vlaktekap staat ter discussie, vooral vanwege de zorgen over de ecologische effecten in samenhang met de schaal van de vlaktekap. De Tweede Kamer vroeg de minister via een motie om opheldering over deze kwestie. In dit artikel vatten we het rapport hier...
Article
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Purpose of Review Non-native tree species (NNT) raise a range of different associations and emotions—to many citizens they are just an exotic curiosity in parks, to many conservationists they are an evil to native ecosystems that should be eradicated, to a rising group of foresters they are part of the solution to climate change and an increasing t...
Article
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Mixed-species forests have become widely studied in the recent years because of their potential to mitigate risks associated with climate change. However, their growth dynamics are often difficult to predict because species interactions vary with climatic and edaphic conditions, stand structure and forest management. We examined species interaction...
Article
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Black locust (Robinia pseudoacacia L.), a species native to the eastern North America, was introduced to Europe probably in 1601 and currently extends over 2.3 × 106 ha. It has become naturalized in all sub-Mediterranean and temperate regions rivaling Populus spp. as the second most planted broadleaved tree species worldwide after Eucalyptus spp. T...
Article
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Ecology and management of northern red oak (Quercus rubra L. syn. Q. borealis F. Michx.) in Europe: a review Northern red oak (Quercus rubra L. syn. Q. borealis F. Michx.) is a valuable broadleaved tree species originating from the eastern half of the USA and Canada. It was introduced to Europe in 1691 and currently covers over 350 000 ha, being fo...
Article
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The tension between biodiversity conservation and multipurpose forest management may lead to conflicts. An internationally prominent example is the Białowieża Forest Massif (BFM), an extensive forest complex with high levels of naturalness. We apply a systematic, multidisciplinary assessment process to review empirical evidence on different dimensi...
Article
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Europe has a history rich in examples of successful and problematic introductions of trees with a native origin outside of Europe (non-native trees, NNT). Many international legal frameworks such as treaties and conventions and also the European Union have responded to the global concern about potential negative impacts of NNT that may become invas...
Article
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Dendroprovenancing studies frequently use site chronologies to identify the origin of archaeological and historical timber. However, radial growth (tree-ring width, TRW) of tree species is influenced by both local and regional climate scales. Here we investigate how the use of annually-resolved Blue Intensity (BI) measurements can enhance dendropro...
Article
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Using insights from the forest ecology literature, we analyze the effect of injured trees on stand composition and carbon stored in above‐ground biomass and the implications for forest management decisions. Results from a Faustmann model with data for a tropical forest on Kalimantan show that up to 50% of the basal area of the stand before harvest...
Article
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The effect of logging on atmospheric carbon concentrations remains highly contested, especially in the tropics where it is associated to forest degradation. To contribute to this discussion, we estimated the carbon balance from logging natural tropical forests in Costa Rica through a life cycle accounting approach. Our system included all major lif...
Article
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Aim Spatial variations of environmental conditions translate into biogeographical patterns of tree growth. This fact is used to identify the origin of timber by means of dendroprovenancing. Yet, dendroprovenancing attempts are commonly only based on ring‐width measurements, and largely neglect additional tree–ring variables. We explore the potentia...
Article
FORMIT-M is a widely applicable, open-access, simple and flexible, climate-sensitive forest management simulator requiring only standard forest inventory data as input. It combines a process-based carbon balance approach with a strong inventory-based empirical component. The model has been linked to the global forest sector model EFI-GTM to secure...
Article
Land-use planning to protect tropical forests requires understanding the relative impact of alternative uses. Low-impact forest management is crucial to produce timber while conserving biodiversity.
Article
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Many monoculture forests have been converted to mixed-species forests in Europe over the last decades. The main reasons for this conversion were probably to increase productivity, including timber production, and enhance other ecosystem services, such as conservation of biodiversity and other nature values. This study was done by synthesizing resul...
Conference Paper
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General and national-level information and experiences on the forest management and the silviculture used with the main non-native tree species in Europe have been compiled and compared to the standard silviculture of appropriate native tree species, including productivity. In general, non-native tree species have been introduced either to increase...
Article
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Tree species distribution in lowland tropical forests is strongly associated with rainfall amount and distribution. Not only plant water availability, but also irradiance, soil fertility, and pest pressure covary along rainfall gradients. To assess the role of water availability in shaping species distribution, we carried out a reciprocal transplan...
Article
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Life cycle assessment (LCA) has become a common methodology to analyze environmental impacts of forestry systems. Although LCA has been widely applied to forestry since the 90s, the LCAs are still often based on generic Life Cycle Inventory (LCI). With the purpose of improving LCA practices in the forestry sector, we developed a European Life Cycle...
Article
A growing number of studies provides evidence that mixed-species forests often have higher stand productivity than monospecific forests, which is referred to as overyielding. In this study, we explored how the combination of species and soil conditions affect overyielding in terms of periodic annual volume increment (PAIV) in Dutch forests. We stud...
Article
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Deforestation and forest degradation, especially in the agricultural landscapes, are serious threats to biodiversity conservation and sustainability of the timber industry. Planting trees on farms has been identified as having great potential to increase forest resources from agricultural landscapes. This paper examined farmers’ motivations and beh...
Article
Research into mixed-forests has increased substantially in the last decades but the extent to which the new knowledge generated meets practitioners’ concerns and is adequately transmitted to them is unknown. Here we provide the current state of knowledge and future research directions with regards to 10 questions about mixed-forest functioning and...
Article
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Planten kunnen zich aanpassen aan veranderende omstandigheden. Zo kunnen bomen grotere bladeren maken in de schaduw, of dikkere bij droogte. Hoe en of een boom ook de wortels kan aanpassen, is veel min- der duidelijk. Wij keken daarom in een onderzoek of je bij verschillende boomsoorten en onder verschillende omstandigheden andere wortels aan- tref...
Article
We studied the interaction between Eucalyptus saligna woodlots and maize crop in southern Rwanda. Three sites were selected and in each, a eucalypt woodlot with mature trees and a suitable adjoining crop field of 12.75 m × 30 m was selected. This was split into two plots of 6 m × 12 m and further subdivided into nine sub-plots running parallel to t...
Article
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Bioclimate envelope models have been widely used to illustrate the discrepancy between current species distributions and their potential habitat under climate change. However, the realism and correct interpretation of such projections has been the subject of considerable discussion. Here, we investigate whether climate suitability predictions corre...
Article
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The Bolivian Amazon holds a complex configuration of people and forested landscapes in which communities hold secure tenure rights over a rich ecosystem offering a range of livelihood income opportunities. A large share of this income is derived from Amazon nut (Bertholletia excelsa). Many communities also have long-standing experience with communi...
Data
Contribution from forest (timber, Amazon nut, other NTFPs and hunting), husbandry (agriculture, agroforestry and livestock) and off-farm income (salary, business and gifts) incomes to the total net income of community households in the Bolivian Amazon. The upper and lower quartiles in the boxplots explain 25% of the variation in the median net inco...
Data
Studies that combine socioeconomic and biological surveys in their methodological approach to determine the socioeconomic and biophysical drivers of forest resources use. (DOCX)
Data
Collaboration agreement signed between the researcher and community leader enabling to carry this research, and consent to interview participating households. Includes Spanish version, the original language in which the agreement was signed upon. (DOCX)
Data
Hypothesized socioeconomic and biophysical factors determining the income derived from (a) Amazon nut and (b) timber by community households in the Bolivian Amazon. A description of the hypothesized factors of the different attributes can be found in Table 2. Solid arrows indicate significant effects of a variable on another, whereas, dotted arrows...
Data
Median net income of the different sources of income derived by community households in the Bolivian Amazon. The upper and lower quartiles in the boxplots, each explain 25% of the variation in the median net income derived by participating households. Empty circles are the outliers. (TIF)
Data
Annual household survey (modified from PEN Questionnaires): Socioeconomic determinants of household wealth and forest use in Bolivian Amazonian communities. Includes Spanish version, the original language in which the survey was carried out. (DOCX)
Data
List of timber species sampled in 72 (2 ha) research transects established at community-based household forests in the Bolivian Amazon. These 17 species represent the 10 main timber species harvested in the region according to country-level forestry reports from 2002 to 2012 (ABT, 2002–2012). We ended up with 17 species because the reports only use...
Data
Results of the structural equation (SEM) models built for incomes of Amazon nut and timber at community-based household forests. DF = Degrees of freedom. (DOCX)
Article
Full-text available
1.There is increasing evidence that species diversity enhances the temporal stability of community productivity in different ecosystems, although its effect at population and tree levels seems to be negative or neutral. Asynchrony in species responses to environmental conditions was found to be one of the main drivers of this stabilizing process. H...
Article
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Key messageSelf-thinning lines are species- and climate-specific, and they should be used when assessing the capacity of different forest stands to increase biomass/carbon storage. ContextThe capacity of forests to store carbon can help to mitigate the effects of atmospheric CO2 rise and climate change. The self-thinning relationship (average size...
Article
We study the potential of tropical multi-age multi-species forests for sequestering carbon in response to financial incentives from REDD+. Following existing carbon crediting schemes, the use of reduced impact logging techniques (RIL) allows a forest manager to apply for carbon credits whereas conventional logging (CL) does not. This paper is the f...
Article
Recent studies show that mixed species forests sometimes have higher stand productivity than monospecific forests, which we refer to as overyielding. Yet, results for temperate forests are ambiguous, possibly because forests differ in local site conditions, thinning history and forest age. In line with the niche complementarity hypothesis, we expec...
Article
Full-text available
Net primary production (NPP) is an important ecological metric for studying forest ecosystems and their carbon sequestration, for assessing the potential supply of food or timber and quantifying the impacts of climate change on ecosystems. The global MODIS NPP dataset using the MOD17 algorithm provides valuable information for monitoring NPP at 1-k...
Article
I. II. III. IV. References SUMMARY: The search for a root economics spectrum (RES) has been sparked by recent interest in trait-based plant ecology. By analogy with the one-dimensional leaf economics spectrum (LES), fine-root traits are hypothesised to match leaf traits which are coordinated along one axis from resource acquisitive to conservative...
Article
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eLetter response to the Naudt et al.article in Science 351, 597 (2016). Afforestation and forest management are important for mitigating climate change. However, by analysing how afforestation and management modified Europe’s forests in extent, stocking and species composition in 2010 as compared to 1750, Naudts et al. (2016) recently claimed that...
Article
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Many harvested timber species of tropical forests have not been regenerating sufficiently for future cutting cycles, which can demand the application of post-harvesting silvicultural treatments. This study analyzed the profitability of sawnwood produced through four treatments applied on seedlings and saplings naturally present or planted in loggin...
Article
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Bos en bosbeheer veranderen continu. Met de ontwikkeling van de productiegerichte bosbouw van vijftig jaar geleden naar een bosbeheer gericht op meervoudige functievervulling in een dichtbevolkte samenleving veranderde ook de rol van de beheerder. Dit vraagt om andere kennis en vaardigheden van de beroepsgroep en andere organisatievormen van onderw...
Article
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br/>Key message Self-thinning lines are species- and climate-specific, and they should be used when assessing the capacity of different forest stands to increase biomass/carbon storage. Context The capacity of forests to store carbon can help to mitigate the effects of atmospheric CO2 rise and climate change. The self-thinning relationship (aver...
Article
Full-text available
Challenges of contemporary forest management are frequently referred to as complex. This article empirically studies complexity in forest management decision-making. In contrast to what is often assumed in the literature, this article starts by assuming that complexity does not just consist of an external descriptive element, but also depends on ho...
Article
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Eucalyptus is abundant in Rwanda, mainly planted in short rotation woodlots, scattered in small clusters over the hilly landscape. A study was done in Butare and Busoro catchments, southern Rwanda from May to November 2007 to estimated water use of eucalypts in representative catchments in Rwanda, establishing a monthly water balance. We compared e...
Article
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Mixing of complementary tree species may increase stand productivity, mitigate the effects of drought and other risks, and pave the way to forest production systems which may be more resource-use efficient and stable in the face of climate change. However, systematic empirical studies on mixing effects are still missing for many commercially import...
Poster
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Tree root trait plasticity and mycorrhizal abundance on contrasting soils.
Article
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In tropical forests light and water availability are the most important factors for seedling growth and survival but an increasing frequency of drought may affect tree regeneration. One central question is whether drought and shade have interactive effects on seedling growth and survival. Here, we present results of a greenhouse experiment, in whic...