Effects of partial defoliation on closed canopy Eucalyptus globulus Labilladière: Growth, biomass allocation and carbohydrates

Quentin, Audrey G.; Beadle, C. L.; O’Grady, Anthony P.; Pinkard, Elizabeth A.

doi:10.1016/j.foreco.2010.11.028

Cited by 47 publications

(41 citation statements)

References 66 publications

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“…Moreover, significant biomass reduction following defoliation have been observed as defoliation limits carbon uptake by reducing the total leaf area, indicating that increases in photosynthesis cannot offset carbon losses [39]. Several studies have found that defoliation reduces growth due to nitrogen loss or water stress [22] but this is not the case in our study, as individuals in our study were well watered and fertilized. Besides, we found some evidence that defoliation increases the N content in roots and leaves (Fig.…”

Section: Discussioncontrasting

confidence: 54%

“…Although leaf loss can lead to significant reductions in stem biomass, root biomass, and total biomass [52][53][54], P. deltoides allocates more carbon to the aboveground biomass through compensatory growth. The present study found that defoliation was partially compensated by increased photosynthetic rate [22]. To compensate for leaf removal, plant requires large amounts of energy investment.…”

Section: Discussionsupporting

confidence: 47%

“…It has been reported that defoliation causes decreases in nonstructural carbohydrates (NSC) that limits growth and survival [16,17]. Moderate and severe defoliation is known to result in reduced NSC concentrations [7,[18][19][20][21][22], while light defoliation had no effects on NSC [23]. This implies the need for further studies on the response in trees subjected to different levels of defoliation to examine whether C limitation may explain the defoliation-induced growth reduction.…”

Section: Introductionmentioning

confidence: 99%

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Sex-specific responses of Populus deltoides to defoliation

Duan

et al. 2017

Acta Soc Bot Pol

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There has been an increasing interest in understanding the differential effects of sexual dimorphism on plant stress responses. However, there is no clear pattern in the responses of the sexes to defoliation. In this study, the effects of different severity of artificial defoliation on biomass production, total nonstructural carbohydrate (NSC) concentration, and photosynthetic rate (P N ) of male and female Populus deltoides were examined. We used half and full defoliation to observe the differences between the sexes in three harvest dates (1 week, 4 weeks, and 8 weeks after treatments). We hypothesized that female and male P. deltoides compared with an undefoliated control would have compensatory growth in response to defoliation treatments. Results showed that half and full defoliation reduced the growth of both sexes. Following half defoliation, root growth was reduced, especially in males, at T2 (4 weeks after defoliation) and T3 (8 weeks after defoliation), while males showed an increase in height increment under the half defoliation compared with the nondefoliation treatments. By contrast, females were more negatively affected by defoliation than males in terms of biomass after 8 weeks. One week after defoliation, P N increased significantly in females and males under half defoliation (+30%, +32%, respectively) and full defoliation (+58%, +56%, respectively). However, 8 weeks after defoliation, there was little difference in P N between defoliated and undefoliated female cuttings. Increases in stomatal conductance (g s ) and leaf nitrogen were observed under fully defoliated female and male cuttings. Moreover, males had less NSC concentrations following half defoliation compared with females. Our results indicate that leaf compensatory growth in male cuttings of P. deltoides was maintained by obtaining greater photosynthetic capacity, higher leaf nitrogen, and lower NSC concentration following half and full defoliation. Our results highlight that females suffered from greater negative effects than did males following half defoliation, but under full defoliation, the differences between both sexes were subtle.

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Section: Discussioncontrasting

confidence: 54%

Section: Discussionsupporting

confidence: 47%

Section: Introductionmentioning

confidence: 99%

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Sex-specific responses of Populus deltoides to defoliation

Duan

et al. 2017

Acta Soc Bot Pol

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“…Changes in canopy structure which rearrange leaf area within the canopy have implications for canopy light interception and thus carbon storage rates [8,9,[40][41][42][43]. Such patterns were observed in a hemlock-dominated forest in southern Appalachia, where growth of successor species increased due to increased light availability in the first two years following mortality of Eastern hemlock [37] and similar results in numerous stand thinning experiments document increased stand production rates [12,13,18,32,33,36,37,39,[44][45][46][47]. These studies document ecosystem functional resilience to partial stand disturbance despite mortality rates of canopy dominants approaching 40%, and attribute such resilience to redistribution of light in the canopy and rearrangement of foliage such that light interception and canopy carbon uptake rates do not decline in proportion to disturbance.…”

Section: Functional Consequencesmentioning

confidence: 85%

Canopy Structural Changes Following Widespread Mortality of Canopy Dominant Trees

Hardiman

Bohrer

Gough

et al. 2013

Forests

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Abstract:Canopy structure affects forest function by determining light availability and distribution. Many forests throughout the upper Great Lakes region are dominated by mature, even-aged, early successional aspen and birch, which comprise 35%-40% of canopy leaf area, and which are senescing at accelerating rates. In 2008 at the University of Michigan Biological Station, we initiated the Forest Accelerated Succession ExperimenT (FASET) by stem girdling all aspen and birch in replicated stands to induce mortality. Our objective was to understand type and rate of canopy structural changes imposed by rapid but diffuse disturbance consisting of mortality of a single age-species cohort. We characterized changes in canopy structural features in 2008-2011 using ground-based Portable Canopy Lidar (PCL) in paired treated and control stands. As aspen and birch in treated plots died, gap fraction of the upper canopy increased, average leaf height decreased, total canopy height declined, and openness of the whole-canopy increased. All of these trends became more pronounced with time. Our findings suggest that as forests throughout the region pass through the impending successional transition prompted by widespread mortality of canopy-dominant early successional aspen and birch species, the canopy will undergo significant structural reorganization with consequences for forest carbon assimilation. OPEN ACCESSForests 2013, 4 538

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“…The absorption of incident radiation by crops depends on their leaf area index (Behling et al, 2015a), solar angle or solar zenith angle, geometry, size, leaf angle and leaf distribution, age, plant arrangement, time of year, cloud cover (Varlet-Grancher et al, 1989), meteorological conditions and crop management practices (Quentin et al, 2011;Caron et al, 2012). The efficiency of radiation use may vary, depending on how the dry matter (air or total) and solar radiation (incident, intercepted, and absorbed) are defined and determined (Gallo et al, 1993).…”

Section: Introductionmentioning

confidence: 99%

Conversion Efficiency of Photosynthetically Active Radiation Into Acacia mearnsii Biomass

2018

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The objective of this experiment was to determine the conversion efficiency of intercepted photosynthetically active radiation into biomass of Acacia mearnsii De Wild. seedlings. A forest species, plastic tubes (90 cm 3 ), and 11 evaluation periods (up to 180 days after emergence) were used in this study. The leaf area index (LAI), total dry biomass (BIO), global solar radiation (GSR), cumulative intercepted photosynthetically active radiation (PARic), and conversion efficiency of radiation (εb) were determined using a pyranometer (LI200X, LICOR). The value of εb in BIO seedlings of Acacia mearnsii was 7.76 g MJ -1 . LAI was directly related to the efficiency of PARic, and this influenced the development, production potential and accumulation of BIO. The value of GSR flow was 11.81 MJ m -2 day -1 , while the value inside the greenhouse was 6.26 MJ m -2 day -1 .

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Effects of partial defoliation on closed canopy Eucalyptus globulus Labilladière: Growth, biomass allocation and carbohydrates

Cited by 47 publications

References 66 publications

Sex-specific responses of Populus deltoides to defoliation

Sex-specific responses of Populus deltoides to defoliation

Canopy Structural Changes Following Widespread Mortality of Canopy Dominant Trees

Conversion Efficiency of Photosynthetically Active Radiation Into Acacia mearnsii Biomass

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