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Details of Award

NERC Reference : NE/D014174/1

A detailed assessment of ecosystem carbon dynamics along an elevation transect in the Andes

Grant Award

Principal Investigator:
Professor YS Malhi, University of Oxford, Geography - SoGE
Science Area:
Terrestrial
Atmospheric
Overall Classification:
Terrestrial
ENRIs:
Global Change
Biodiversity
Science Topics:
Biogeochemical Cycles
Ecosystem Scale Processes
Soil science
Climate & Climate Change
Abstract:
Tropical montane forests are amongst the most fascinating yet least studied of terrestrial ecosystems. In terms of ecosystem science, they combine some of the attributes of temperate forests (low mean annual temperature) with those of lowland tropical forests (lack of temperature seasonality), and thereby provide an important test of our understanding of climatic controls on ecosystem carbon and nutrient cycling. In addition to holding large stocks of carbon in their soils, they host a large fraction of global biodiversity. Hence changes in tropical montane forest ecosystems could have a profound effect on global biodiversity and the global carbon cycle. As one climbs an elevation gradient in the wet tropics, two trends in ecosystem properties stand out: an apparent decline in above-ground productivity (the production of wood and leaves), and an increase in soil and dead biomass organic stocks at the expense of live biomass. However, although these trends are well-documented, there is still considerable debate as to the causes of these trends. We will focus on three aspects of the debate: - does below-ground root productivity decline in parallel with above-ground productivity, or does it actually increase (as indicated by a recent study), resulting in little trend in total productivity with elevation ? - do lowland tropical forests lose more carbon through respiration than tropical montane or temperate forests, and is the magnitude of this proportional loss related to ambient temperature ? - is the decline in decay rates with increasing elevation entirely explained by temperature, or is litter quality and important factor ? In this proposal we will explore the causes of both these trends, by conducting detailed measurements of plant, litter and soil carbon dynamics at four sites along an altitudinal transect in the Andes. This will build upon and complement similar measurements that we are currently conducting in the lowland Peruvian Amazon. We established the field study site in 2003 We will: (i) Conduct detailed observation of above- and below-ground productivity, measuring the production of wood, leaves and roots. (ii) Quantify respiratory CO2 emissions from leaves, wood and roots, and from decaying organic matter in litter and soils. (iii) Quantify the stocks and flows of C, N and, P in litter and soil pools. (iv) Quantify the the effects of temperature, litter quality and rainfall on the decay rates of leaf litter, woody debris, humic material and soil organic matter, by conducting a translocation experiment, where samples of litter, dead wood and soil with be swapped between different elevations along the transect, and the decay rates of material monitored over time.
Period of Award:
1 Sep 2006 - 31 Aug 2009
Value:
£249,497 Lead Split Award
Authorised funds only
NERC Reference:
NE/D014174/1
Grant Stage:
Completed
Scheme:
Standard Grant (FEC)
Grant Status:
Closed
Programme:
Standard Grant

This grant award has a total value of £249,497  

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FDAB - Financial Details (Award breakdown by headings)

DI - Other CostsIndirect - Indirect CostsDA - InvestigatorsDA - Estate CostsDI - EquipmentDI - StaffDI - T&S
£29,460£97,521£12,811£13,033£9,524£57,439£29,707

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