Treesearch

The 21st Biennial Southern Silvicultural Research Conference (BSSRC) was held on March 16-17, 2021, in a virtual format. The BSSRC is designed as a forum to exchange silvicultural information between researchers, land managers, forest industry, and graduate students. From the 64 oral presentations and 22 posters offered at the conference, 26 papers and 24 extended abstracts were submitted to these proceedings. The submissions were organized into seven topics, which include Prescribed Fire; Bottomland and Riparian Forests; Loblolly Pine Management; Natural Disturbances and Climate Change;...

Las briofitas son un grupo diverso de plantas con distribución mundial, también conocidas como musgos, hepáticas y antocerotes. Estas pequeñas plantas absorben agua por sus hojas (filidios) y tallos (caulidios), y no necesitan raíces o sistema vascular para mantenerse hidratadas. Las briofitas se dispersan por esporas producidas en estructuras especializadas (cápsula/ esporofito) y no producen flores ni semillas. Las briofitas cumplen un rol importante en los bosques capturando agua y nutrientes de la atmósfera, manteniendo la humedad, ayudando a estabilizar el suelo y fijando carbono....

To investigate how source and processing control the composition of “terrestrial” dissolved organic matter (DOM), we combine soil and tree leachates, tree DOM, laboratory bioincubations, and ultrahigh resolution Fourier-transform ion cyclotron resonance mass spectrometry in three common landscape types (upland forest, forested wetland, and poor fen) of Southeast Alaska’s temperate rainforest. Tree (Tsuga heterophylla and Picea sitchensis) needles and bark and soil layers from each site were leached, and tree stemflow and throughfall collected to examine DOM sources. Dissolved organic...

1. Forest canopy structural complexity (CSC), an emergent ecosystem property, plays a critical role in controlling ecosystem productivity, resource acquisition and resource use-efficiency; yet is poorly characterized across broad geographic scales and is difficult to upscale from the plot to the landscape. 2. Here, we show that the relationship between canopy height and CSC can be explained using power laws by analysing lidar-derived CSC data from 17 temperate forest sites spanning over 17 degrees of latitude. Across three plant functional types (deciduous broadleaf, evergreen needleleaf...

canopy defoliation is an important source of disturbance in forest ecosystems that has rarely beenrepresented in large-scale manipulation experiments. Scalable crown to canopy level experimentaldefoliation is needed to disentangle effects of variable intensity, timing, and frequency on forest structure,function, and mortality. We present a novel pressure washing-based defoliation method that can be implemented at the canopy-scale, throughout the canopy volume, targeted to individual leaves/trees, andcompleted within a timeframe of hours/days. Pressure washing proved successful at producing...

Ultramafc ecosystems are renowned for high endemism and habitat specialization. However, most of our understanding of ultramafc plant ecology comes from Medi‑ terranean and temperate climes, raising questions about the generalizability of plant responses to ultramafc soils. This is especially apparent in tropical ultramafc eco‑ systems which exhibit a wide range of endemism and diferentiation between ultra‑ mafc and adjacent non-ultramafc soils. Our objectives were two-fold: 1) synthesize our understanding of tropical ultramafc plant ecology, paying particular attention to generalities...

Black ash wetlands cover approximately 1.2 million ha of wetland forest in the western Great Lakes region, providing critical habitat for wildlife. The future of these wetlands is critically threatened by a variety of factors, including emerald ash borer (Agrilus planipennis; emerald ash borer [EAB]), which has been eliminating native populations of otherwise healthy ash throughout the Great Lakes region since it was discovered in 2002. To quantify the potential impacts of tree mortality from EAB on wildlife communities, we measured seasonal bird, mammal, and amphibian diversity in black...

Determining when a disturbance has occurred, its severity, and when the system recovered, is important tonumerous questions in the aquatic sciences. This problem can be conceptualized as the timing and degree ofperturbation from a typical state, and when the system returns to that typical state. We present an algorithm fordetecting disturbance and recovery designed for high-frequency time series, e.g., data produced by automated sampling devices in instrumented buoys and flux towers. The algorithm quantifies differences in the empiricalcumulative distribution functions of moving windows...