scholarly journals Biomass allocation patterns and allometric relationships between components of the androdioecious Acer tegmentosum

2016 ◽  
Vol 73 (3) ◽  
pp. 729-739 ◽  
Author(s):  
Xinna Zhang ◽  
Chunyu Zhang ◽  
Xiuhai Zhao
Keyword(s):  
Biomass Allocation ◽  
Allometric Relationships ◽  
Allocation Patterns

scholarly journals Nitrogen addition affects plant biomass allocation but not allometric relationships among different organs across the globe

2020 ◽  
Author(s):  
Kai Yue ◽  
Dario A Fornara ◽  
Wang Li ◽  
Xiangyin Ni ◽  
Yan Peng ◽  
...  
Keyword(s):  
Biomass Allocation ◽  
Mass Fraction ◽  
Plant Biomass ◽  
Terrestrial Ecosystems ◽  
Interactive Effects ◽  
N Addition ◽  
Allometric Relationships ◽  
Optimal Partitioning ◽  
Whole Plant ◽  
Allocation Patterns

Abstract Aims Biomass allocation to different organs is a fundamental plant ecophysiological process to better respond to changing environments; yet, it remains poorly understood how patterns of biomass allocation respond to nitrogen (N) additions across terrestrial ecosystems worldwide. Methods We conducted a meta-analysis using 5474 pairwise observations from 333 articles to assess how N addition affected plant biomass and biomass allocation among different organs. We also tested the “ratio-based optimal partitioning” vs. the “isometric allocation” hypotheses to explain potential N addition effects on biomass allocation. Important findings We found that (1) N addition significantly increased whole plant biomass and the biomass of different organs, but decreased root:shoot ratio (RS) and root mass fraction (RMF) while no effects of N addition on leaf mass fraction (LMF) and stem mass fraction (SMF) at the global scale; (2) the effects of N addition on ratio-based biomass allocation were mediated by individual or interactive effects of moderator variables such as experimental conditions, plant functional types, latitudes, and rates of N addition; and (3) N addition did not affect allometric relationships among different organs, suggesting that decreases in RS and RMF may result from isometric allocation patterns following increases in whole plant biomass. Despite alteration of ratio-based biomass allocation between root and shoot by N addition, the unaffected allometric scaling relationships among different organs (including root vs. shoot) suggest that plant biomass allocation patterns are more appropriately explained by the isometric allocation hypothesis rather than the optimal partitioning hypothesis. Our findings contribute to better understand N-induced effects on allometric relationships of terrestrial plants, and suggest that these ecophysiological responses should be incorporated into models that aim to predict how terrestrial ecosystems may respond to enhanced N deposition under future global change scenarios.

Responses of black spruce seedlings to simulated present versus future seedbed environments

1995 ◽  
Vol 25 (4) ◽  
pp. 545-554 ◽  
Author(s):  
Zhang Ming Wang ◽  
Martin J. Lechowicz ◽  
Catherine Potvin
Keyword(s):  
Biomass Allocation ◽  
Nitrogen Availability ◽  
Seedling Survival ◽  
Dry Mass ◽  
Future Climate ◽  
Nitrogen Use ◽  
Seedling Performance ◽  
Bud Development ◽  
The Future ◽  
Allocation Patterns

We investigated the effects of nitrogen availability and present versus future atmospheric environments (i.e., climate) on the seedling performance of 16 open-pollinated maternal families of Piceamariana (Mill.) B.S.P. over two simulated growing seasons. Diurnal and seasonal patterns of temperature, relative humidity, photoperiod, and light intensity were simulated. The simulated future climate included both elevated CO2 and seasonally appropriate increases in mean monthly temperatures. Compared with the present, the future climate increased seedling survival, total and root dry mass, rate of winter bud development, net photosynthetic rate, and water and nitrogen use efficiencies; decreased needle nitrogen content; and altered biomass allocation patterns. Greater nitrogen availability greatly improved seedling performance and changed biomass allocation patterns. Climate and nitrogen level interacted synergistically to promote seedling growth (branch number and root dry mass), survival, and bud development. The future climate increased seedling survival, rate of bud development, and nitrogen use efficiency much more in the low than in the high nitrogen regime. Seedling performance in the second season was dependent on initial seed mass, but less than in the 1st year. Some of the differences among the families and in their interactions with the climate and (or) nitrogen fertilization suggest that families selected for rapid growth under present conditions may not do well in the future, at least in terms of early establishment. Forest managers and tree breeders should take this possibility into consideration in their tree improvement and reforestation programs.

scholarly journals Response of biomass allocation patterns to thinning in Pinus halepensis differs under dry and semiarid Mediterranean climates

2015 ◽  
Vol 72 (5) ◽  
pp. 595-607 ◽  
Author(s):  
Raquel Alfaro-Sánchez ◽  
Francisco R. López-Serrano ◽  
Eva Rubio ◽  
Raúl Sánchez-Salguero ◽  
Daniel Moya ◽  
...  
Keyword(s):  
Biomass Allocation ◽  
Pinus Halepensis ◽  
Allocation Patterns

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.

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