A5007793579- Plant Water Relations and Carbon Dynamics
- Forest ecology and management
- Tree-ring climate responses
- Tree Root and Stability Studies
- Plant responses to elevated CO2
- Fire effects on ecosystems
- Forest Insect Ecology and Management
- Horticultural and Viticultural Research
- Soil and Unsaturated Flow
- Seedling growth and survival studies
- Plant responses to water stress
- Species Distribution and Climate Change
- Botany and Plant Ecology Studies
- Archaeology and Natural History
- Insect and Arachnid Ecology and Behavior
- Remote Sensing and LiDAR Applications
- Forest Biomass Utilization and Management
- Aeolian processes and effects
- Turfgrass Adaptation and Management
- Avian ecology and behavior
- Ecology and Vegetation Dynamics Studies
- Congenital limb and hand anomalies
- Geological Modeling and Analysis
- Environmental DNA in Biodiversity Studies
- Soil Carbon and Nitrogen Dynamics
University of California, Berkeley
2009-2022
Acupuncture & Integrative Medicine College
2021
It is commonly assumed that transpiration does not occur at night because leaf stomata are closed in the dark. We tested this assumption across a diversity of ecosystems and woody plant species by various methods to explore circumstances when false. Our primary goals were: (1) evaluate nature magnitude nighttime transpiration, En, or stomatal conductance, gn; (2) seek potential generalizations about where it occurs. Sap-flow, porometry stable isotope tracer measurements were made on 18 tree...
As the only species exceeding 90 m in height and 2000 years of age, Sequoia sempervirens Sequoiadendron giganteum provide optimal platform upon which to examine interactions among tree structure, growth. We climbed 140 trees old‐growth redwood forests across California, USA, spanning a broad range sizes including tallest, largest, oldest known living individuals (i.e., 115.86 vs. 96.29 tall, 424 582 Mg aboveground dry mass, 2510 3240 old for , respectively). used combination direct...
We examined changes in branch hydraulic, leaf structure and gas exchange properties coast redwood (Sequoia sempervirens) giant sequoia (Sequoiadendron giganteum) trees of different sizes. Leaf-specific hydraulic conductivity (k(L)) increased with height S. sempervirens but not giganteum, while xylem cavitation resistance both species. Despite adjustments, mass per unit area (LMA) carbon isotope ratios (delta(13)C) increased, maximum mass-based stomatal conductance (g(mass)) photosynthesis...
Abstract. Interactions between wind and trees control energy exchanges the atmosphere forest canopies. This exchange can lead to widespread damage of trees, is a key disturbance agent in many world's forests. However, most research on this topic has focused conifer plantations, where risk management economically important, rather than broadleaf forests, which dominate carbon cycle. study brings together tree motion time-series data systematically evaluate factors influencing responses...
Treetops become increasingly constrained by gravity-induced water stress as they approach maximum height. Here we examine the effects of height on seasonal and diurnal sap flow dynamics at tops 12 unsuppressed Sequoia sempervirens (D. Don) Endl. (coast redwood) trees 68–113 m tall during one growing season. Average treetop velocity (VS), transpiration per unit leaf area (EL) stomatal conductance (GS) significantly decreased with increasing These differences in were associated an unexpected...
We compared the physiology and growth of seedlings originating from different Sequoia sempervirens (D. Don.) Endl. (coast redwood) Sequoiadendron giganteum (Lindl.) Buchh. (giant sequoia) populations subjected to progressive drought followed by a recovery period in controlled greenhouse experiment. Our objective was examine how multiple plant traits interact influence response each species seed population single cycle. measured soil water status, leaf gas exchange, stem embolism control...
Abstract Assessing the ecological importance of clouds has substantial implications for our basic understanding ecosystems and predicting how they will respond to a changing climate. This study was conducted in coastal Bishop pine forest ecosystem that experiences regular cycles stratus cloud cover inundation summer. Our objective understand these impact metabolism by contrasting two sites along gradient summer cover. The site under ~15% more daytime hours had lower air temperatures...
Abstract Tracheid buckling may protect leaves in the dynamic environments of forest canopies, where rapid intensifications evaporative demand, such as those brought on by changes light availability, can result sudden increases transpiration rate. While treetop function reliably direct light, below upper crown must tolerate rapid, thermally driven demand. Using synchrotron‐based X‐ray microtomography, we visualized impacts experimentally induced water stress and subsequent fogging living...
Water stored in tree stems (i.e., trunks and branches) is an important contributor to transpiration that can improve photosynthetic carbon gain reduce the probability of cavitation. However, tall trees, capacity store water may decline with height because chronically low potentials associated gravitational potential gradient. We quantified importance elastic stem storage top 5-6 m large (4.2-5.0 diameter at breast height, 82.1-86.3 tall) Sequoiadendron giganteum (Lindley) J. Buchholz (giant...
Here, we describe patterns of reproduction and flight phenology putative Phloeosinus punctatus in giant sequoia groves compare morphology genotypes beetles from sympatric (Sequoiadendron giganteum) California incense-cedar (Calocedrus decurrens). Surveys conducted 2022 revealed that numerous branches fall crowns (on average ~30 branches/tree), with 20%-50% trees per site shedding branches, depositing breeding material for on the forest floor subsequently becomes colonized. When noninfested...
Abstract Field stations are platforms for documenting patterns and processes in ecosystems critical understanding how anthropogenic climate change reshapes nature. Although networks of field have been used to identify at continental global scales, these broad, sparsely distributed miss variation local regional scales. We propose that regional-scale research essential addressing the myriad ecological evolutionary challenges—including management mitigation options—that cannot be answered by...