Measurement and modelling of bryophyte evaporation in a boreal forest chronosequence
نویسندگان
چکیده
The effects of changing climate and disturbance on forest water cycling are not well understood. In particular, bryophytes contribute significantly to forest evapotranspiration in poorly drained boreal forests, but few studies have directly measured this flux and how it changes with stand age and soil drainage. We measured bryophyte evaporation (E) in the field (in Canadian Picea mariana forests of varying ages and soil drainages) and under controlled laboratory conditions, and modelled daily E using site-specific meteorological data to drive a Penman–Monteith-based model. Field measurements of E averaged 0Ð37 mm day 1 and ranged from 0Ð03 (Pleurozium schreberii in a 77-year-old dry stand) to 1Ð43 mm day 1 (Sphagnum riparium in a 43-year-old bog). In the laboratory, moss canopy resistance (which ranged from 3⁄40 to 1500 s m 1) was constant until a moss water content of 3⁄46 g g 1 and then climbed sharply with further drying; unexpectedly, no difference was observed between the three moss groups (feather mosses, hollow mosses and hummock mosses) tested. Modelled annual E ranged from 0Ð4 mm day 1, in the well-drained stands, to 3⁄41 mm day 1 in the 43-year-old bog. The Penman–Monteith modelling approach used was relatively insensitive to most parameters but only explained 35% of the variability in field measurements. Bryophyte E was greater in bogs than in upland stands, was driven by low-lying mosses and varied with stand age only in the poorly drained stands; this suggests that bryophytes may provide a buffering effect to fire-driven changes in tree transpiration. Copyright 2010 John Wiley & Sons, Ltd.
منابع مشابه
Forest productivity decline caused by successional paludification of boreal soils.
Long-term forest productivity decline in boreal forests has been extensively studied in the last decades, yet its causes are still unclear. Soil conditions associated with soil organic matter accumulation are thought to be responsible for site productivity decline. The objectives of this study were to determine if paludification of boreal soils resulted in reduced forest productivity, and to id...
متن کاملCharcoal in Organic Horizon and Surface Mineral Soil in a Boreal Forest Fire Chronosequence of Western Quebec: Stocks, Depth Distribution, Chemical Properties and a Synthesis of Related Studies
Citation: Preston CM, Simard M, Bergeron Y, Bernard GM and Wasylishen RE (2017) Charcoal in Organic Horizon and Surface Mineral Soil in a Boreal Forest Fire Chronosequence of Western Quebec: Stocks, Depth Distribution, Chemical Properties and a Synthesis of Related Studies. Front. Earth Sci. 5:98. doi: 10.3389/feart.2017.00098 Charcoal in Organic Horizon and Surface Mineral Soil in a Boreal For...
متن کاملForestry impacts on the hidden fungal biodiversity associated with bryophytes.
Recent studies have revealed an unexpectedly high, cryptic diversity of fungi associated with boreal forest bryophytes. Forestry practices heavily influence the boreal forest and fundamentally transform the landscape. However, little is known about how bryophyte-associated fungal communities are affected by these large-scale habitat transformations. This study assesses to what degree bryophyte-...
متن کاملSpatial and temporal validation of the MODIS LAI and FPAR products across a boreal forest wildfire chronosequence
متن کامل
Fungal Community Shifts in Structure and Function across a Boreal Forest Fire Chronosequence.
Forest fires are a common natural disturbance in forested ecosystems and have a large impact on the microbial communities in forest soils. The response of soil fungal communities to forest fire is poorly documented. Here, we investigated fungal community structure and function across a 152-year boreal forest fire chronosequence using high-throughput sequencing of the internal transcribed spacer...
متن کامل