Elevated [CO2] and nutrient status modified leaf phenology and growth rhythm of young Populus trichocarpa trees in a 3-year field study

Sigurðsson, Bjarni D.

doi:10.1007/s004680100121

Cited by 83 publications

(71 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Budburst is delayed in poplar (22) and spruce (23), and flowering is accelerated in clover (24). Forbs can be either accelerated or delayed (25)(26)(27)(28), but most studies have found no significant effects of elevated CO 2 on phenology (29)(30)(31)(32)(33)(34).…”

Section: Discussionmentioning

confidence: 99%

Diverse responses of phenology to global changes in a grassland ecosystem

Cleland

Chiariello²,

Loarie

et al. 2006

Proc. Natl. Acad. Sci. U.S.A.

423

349

View full text Add to dashboard Cite

Shifting plant phenology (i.e., timing of flowering and other developmental events) in recent decades establishes that species and ecosystems are already responding to global environmental change. Earlier flowering and an extended period of active plant growth across much of the northern hemisphere have been interpreted as responses to warming. However, several kinds of environmental change have the potential to influence the phenology of flowering and primary production. Here, we report shifts in phenology of flowering and canopy greenness (Normalized Difference Vegetation Index) in response to four experimentally simulated global changes: warming, elevated CO 2, nitrogen (N) deposition, and increased precipitation. Consistent with previous observations, warming accelerated both flowering and greening of the canopy, but phenological responses to the other global change treatments were diverse. Elevated CO 2 and N addition delayed flowering in grasses, but slightly accelerated flowering in forbs. The opposing responses of these two important functional groups decreased their phenological complementarity and potentially increased competition for limiting soil resources. At the ecosystem level, timing of canopy greenness mirrored the flowering phenology of the grasses, which dominate primary production in this system. Elevated CO 2 delayed greening, whereas N addition dampened the acceleration of greening caused by warming. Increased precipitation had no consistent impacts on phenology. This diversity of phenological changes, between plant functional groups and in response to multiple environmental changes, helps explain the diversity in large-scale observations and indicates that changing temperature is only one of several factors reshaping the seasonality of ecosystem processes.

show abstract

Section: Discussionmentioning

confidence: 99%

Diverse responses of phenology to global changes in a grassland ecosystem

Cleland

Chiariello²,

Loarie

et al. 2006

Proc. Natl. Acad. Sci. U.S.A.

423

349

View full text Add to dashboard Cite

show abstract

“…On estimating vegetation phenology transition dates, it is unclear from this study, which MODIS product is 'best' or whether the differences presented in this study significantly affect estimating NPP. The literature on phenology makes a distinction between bud-, leaf-, growth-, and reproductive phenology (Sigurdsson, 2001), each of which may be affected differently by environmental conditions (e.g., climate, nutrient availability, or atmospheric CO 2 concentrations). Morecroft et al (2003) showed that full photosynthetic capacity of Quercus robur leaves was reached 50 days after budbreak.…”

Section: Implications For Estimating Carbon and Water Exchangementioning

confidence: 99%

Monitoring spring canopy phenology of a deciduous broadleaf forest using MODIS

Ahl

Gower

Burrows

et al. 2006

Remote Sensing of Environment

262

154

View full text Add to dashboard Cite

Climate change is predicted to alter the canopy phenology of temperate and boreal forests, which will affect carbon, water, and energy budgets. Therefore, there is a great need to evaluate remotely sensed products for their potential to accurately capture canopy dynamics. The objective of this study was to compare several products derived from the Moderate Resolution Imaging Spectroradiometer (MODIS) to field measurements of fraction photosynthetically active radiation (FPAR) and plant area index (PAI) for a deciduous broadleaf forest in northern Wisconsin in 2002. MODIS products captured the general phenological development of the canopy although MODIS products overestimated the leaf area during the overstory leaf out period. Field data suggest that the period from budburst to canopy maturity, or maximum PAI, occurred in 10 to 12 days while MODIS products predicted onset of greenness and maturity from 1 to 21 days and 0 to 19 days earlier than that from field observations, respectively. Temporal compositing of MODIS data and understory development are likely key factors explaining differences with field data. Maximum PAI estimates differed only by 7% between field derived and MODIS-based estimates of LAI. Implications for ecosystem modeling of carbon and water exchange and future research needs are discussed.

show abstract

“…Thus, the effect of water limitation should be added to CASSIA as a factor that imposes a direct limitation on growth sink strength even before it affects growth indirectly via photosynthesis , Deslauriers et al 2016. Nutrient effect on growth could be included in maximum daily growth (L) (Bergh et al 1999) and possibly phenology (Sigurdsson 2001).…”

Section: Source and Sink Effects On Growthmentioning

confidence: 99%

Modelling intra- and inter-annual growth dynamics of Scots pine in the whole-tree carbon balance framework

Schiestl-Aalto¹

2017

Diss. For.

View full text Add to dashboard Cite

3 Schiestl-Aalto, P. (2017) Modelling intra-and inter-annual growth dynamics of Scots pine in the wholetree carbon framework. Dissertationes Forestales 234. 44 p. https://doi.org/10.14214/df.234Environmental factors have a dual effect on growth as they affect both the momentary growth rate (direct effect) and the rate of ontogenetic development (indirect effect). Photosynthesis on the other hand is the source of carbon that is needed for growth, respiration and other purposes. There are two opposite theories about the factor determining growth rate: 1) the availability of carbon for growth (source limitation) and 2) limitation that environmental factors cause on tissue ability to grow (sink limitation). Understanding the responses of the growth of tree organs (wood, needles, roots) to environmental and other factors is important to be able to understand the changes in tree growth and carbon balance in changing climatic conditions.The purpose of this study was to define the effects of temperature on Scots pine growth at different temporal scales and to estimate the relative importances of the source and sink effects on growth. For that, a dynamic growth model CASSIA (Carbon Allocation Sink Source InterAction) was constructed.CASSIA was able to predict daily primary and secondary wood and needle growth rate variation with indirect and direct effects of temperature. In addition, the temperature of warm previous late summer was observed to lead to enhanced length of the growth period (in temperature accumulation units) of shoots in the following year. Growth onset during spring was observed to be a continuous process determined by temperature accumulation, instead of momentary temperatures.Short-term growth variations in normal conditions were concluded to be sink limited because CASSIA was able to predict the within year growth with temperature and without direct effect of photosynthesis or stored carbon. On the other hand carbon source effect (gross primary production) was needed to produce the between year variation in growth. According to the results of this study, growth is limited by a complex combination of sink and source effects. Furthermore, environmental factors affect growth at different time scales varying from instantaneous effects to delayed effects from previous year(s). More research is needed to identify the factors determining the carbon flows to different processes.

show abstract

Elevated [CO2] and nutrient status modified leaf phenology and growth rhythm of young Populus trichocarpa trees in a 3-year field study

Cited by 83 publications

References 34 publications

Diverse responses of phenology to global changes in a grassland ecosystem

Diverse responses of phenology to global changes in a grassland ecosystem

Monitoring spring canopy phenology of a deciduous broadleaf forest using MODIS

Modelling intra- and inter-annual growth dynamics of Scots pine in the whole-tree carbon balance framework

Contact Info

Product

Resources

About