Growth, biomass allocation and plant nitrogen concentration in Chilean temperate rainforest tree seedlings: effects of nutrient availability

Oecologia ◽  
1997 ◽  
Vol 109 (1) ◽  
pp. 49-58 ◽  
Author(s):  
C. H. Lusk ◽  
Olga Contreras ◽  
Javier Figueroa
Keyword(s):  
Biomass Allocation ◽  
Nutrient Availability ◽  
Nitrogen Concentration ◽  
Tree Seedlings ◽  
Temperate Rainforest ◽  
Plant Nitrogen

scholarly journals Effects of increased N and P availability on biomass allocation and root carbohydrate reserves differ between N-fixing and non-N-fixing savanna tree seedlings

2017 ◽  
Author(s):  
Varan Varma ◽  
Arockia M Catherin ◽  
Mahesh Sankaran
Keyword(s):  
Functional Groups ◽  
Biomass Allocation ◽  
Nutrient Availability ◽  
Belowground Biomass ◽  
Dry Forest ◽  
Plant Functional Groups ◽  
Tree Seedlings ◽  
P Availability ◽  
Nutrient Deposition ◽  
Allocation Patterns

AbstractIn mixed tree-grass ecosystems, tree recruitment is limited by demographic bottlenecks to seedling establishment arising from inter- and intra-life form competition, and disturbances such as fire. Enhanced nutrient availability resulting from anthropogenic nitrogen (N) and phosphorus (P) deposition can alter the nature of these bottlenecks by changing seedling growth and biomass allocation patterns, and lead to longer-term shifts in tree community composition if different plant functional groups respond differently to increased nutrient availability. However, the extent to which tree functional types characteristic of savannas differ in their responses to increased N and P availability remains unclear. We quantified differences in above- and belowground biomass, and root carbohydrate contents – parameters known to influence the ability of plants to compete, as well as survive and recover from fires – in seedlings of multiple N-fixing and non-N-fixing tree species characteristic of Indian savanna and dry-forest ecosystems to experimental N and P additions. N-fixers in our study were co-limited by N and P availability, while non-N-fixers were N limited. Although both functional groups increased biomass production following fertilisation, non-N-fixers were more responsive and showed greater relative increases in biomass with fertilisation than N-fixers. N-fixers had greater baseline investment in belowground resources and root carbohydrate stocks, and while fertilisation reduced root:shoot ratios in both functional groups, root carbohydrate content only reduced with fertilisation in non-N-fixers. Our results indicate that, even within a given system, plants belonging to different functional groups can be limited by, and respond differentially to, different nutrients, suggesting that long-term consequences of nutrient deposition are likely to vary across savannas contingent on the relative amounts of N and P being deposited in sites.

Effects of Submergence and Nitrogen Concentration on the Resources Utilization of Alternanthera philoxeroides

2013 ◽  
Vol 864-867 ◽  
pp. 239-242
Author(s):  
Wen Juan Ding ◽  
Hua Yong Zhang ◽  
Fang Juan Zhang
Keyword(s):  
Water Level ◽  
Biomass Allocation ◽  
Invasive Plant ◽  
Nitrogen Concentration ◽  
Soluble Sugar ◽  
Nitrogen Pollution ◽  
Water Bodies ◽  
Alternanthera Philoxeroides ◽  
Negative Effects ◽  
Nitrogen Concentrations

This study examined the effects of submergence and nitrogen concentration on biomass allocation and nutrients utilization of an invasive plant Alternanthera philoxeroides. In the experiment, A. philoxeroides was applied to two water level treatments (0 and 25cm above the surface) across with two nitrogen concentrations (0 and 10 mg/l N). The results showed that submergence decreased leaf fraction and increased stem fraction, but high N changed this situation. In submergence, high N increased leaf fraction but decreased stem fraction due to leaves survival and maintenance. Submergence decreased root fraction and the content of soluble sugar in stem. The results suggested that high N concentration could counteract the negative effects of submergence. Therefore, the risk of A. philoxeroides invasion might be enhanced by nitrogen pollution in fluctuating water bodies, and should be attention intensely.

Nitrogen Rate and Timing Effects on Collard Yield and Plant Nitrogen Concentration

jpa ◽  
1997 ◽  
Vol 10 (3) ◽  
pp. 438-441
Author(s):  
E. A. Guertal ◽  
E. van Santen
Keyword(s):  
Nitrogen Concentration ◽  
Nitrogen Rate ◽  
Plant Nitrogen ◽  
Timing Effects

scholarly journals Red hot maples: Acer rubrum first-year phenology and growth responses to soil warming

2017 ◽  
Vol 47 (2) ◽  
pp. 159-165 ◽  
Author(s):  
J.A. Wheeler ◽  
N.M. Gonzalez ◽  
K.A. Stinson
Keyword(s):  
Biomass Allocation ◽  
Environmental Conditions ◽  
Acer Rubrum ◽  
Growing Season ◽  
Tree Seedlings ◽  
Red Maple ◽  
Growth Responses ◽  
Soil Warming ◽  
Leaf Production ◽  
Trade Offs

Microhabitat environmental conditions are an important filter for seedling establishment, controlling the availability of optimal recruitment sites. Understanding how tree seedlings respond to warming soil temperature is critical for predicting population recruitment in the future hardwood forests of northeastern North America, particularly as environmental conditions and thus optimal microhabitat availabilities change. We examined the effect of soil warming of 5 °C during the first growing season on germination, survival, phenology, growth, and stem and root biomass allocation in Acer rubrum L. (red maple) seedlings. While there was no effect of soil warming on germination or survival, seedlings growing in warmer soils demonstrated significantly accelerated leaf expansion, delayed autumn leaf senescence, and an extended leaf production period. Further, seedlings growing in warmer soils showed larger leaf area and stem and root structures at the end of the first growing season, with no evidence of biomass allocation trade-offs. Results suggest that A. rubrum seedlings can capitalize on soil warming by adjusting leaf phenology and leaf production, resulting in a longer period of carbon uptake and leading to higher overall biomass. The absence of growth allocation trade-offs suggests that A. rubrum will respond positively to increasing soil temperatures in northeastern forests, at least in the early life stages.

Traits associated with nutrient impoverishment and shade-tolerance in tree juveniles of three Bornean rain forests with contrasting nutrient availability

2015 ◽  
Vol 31 (3) ◽  
pp. 231-242 ◽  
Author(s):  
Ryota Aoyagi ◽  
Kanehiro Kitayama
Keyword(s):  
Functional Traits ◽  
Biomass Allocation ◽  
Nutrient Availability ◽  
Tree Species ◽  
Shade Tolerance ◽  
Rain Forests ◽  
Leaf Production ◽  
Site Factor ◽  
Dipterocarp Forests ◽  
Nutrient Impoverishment

Abstract:In this study, we tested the hypothesis that functional traits associated with nutrient impoverishment contribute to enhancing shade-tolerance (survival at low light) for the juveniles of canopy tree species in Bornean rain forests. To test the hypothesis, survival and functional traits (biomass allocation, leaf dynamics and foliar nutrient concentration) were investigated as a function of light conditions for saplings of 13 species in three forests with different levels of nutrient availability. As predicted by the hypothesis, the species in the severely nutrient-poor site (a tropical heath forest on nutrient-poor soils) showed greater shade-tolerance (>91% survival for 8 mo at 5% global site factor) than in the other two sites (mixed dipterocarp forests) (54–87% survival). Across the species, greater shade-tolerance was associated with a higher biomass allocation to roots, a slower leaf production and a higher foliar C concentration, which are considered as C-conservation traits under nutrient impoverishment. These results suggest that the juveniles of the canopy species occurring on nutrient-poor soils can enhance shade-tolerance by the same mechanisms as the adaptation to nutrient impoverishments. Tree species in nutrient-poor environments may be selected for surviving also in shaded conditions.

Rooting Volume, Nutrient Availability, and CO2-Induced Growth Enhancements in Temperate Forest Tree Seedlings

1996 ◽  
Vol 6 (2) ◽  
pp. 619-627 ◽  
Author(s):  
K. D. M. McConnaughay ◽  
A. B. Nicotra ◽  
F. A. Bazzaz
Keyword(s):  
Nutrient Availability ◽  
Temperate Forest ◽  
Forest Tree ◽  
Tree Seedlings
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