scholarly journals Seedling size and nutrient availability in the fall determine nitrogen resorption and storage compound allocation in Quercus variabilis

2021 ◽  
Author(s):  
Jiaxi Wang ◽  
Mercedes Uscola ◽  
Guolei Li
Keyword(s):  
Growth Phase ◽  
Resorption Efficiency ◽  
Shoot Height ◽  
Seedling Size ◽  
Nitrogen Resorption ◽  
Quercus Variabilis ◽  
Nutrient Reserve ◽  
Terminal Buds ◽  
N Resorption ◽  
N Resorption Efficiency

Abstract Aims Soil fertility and resorption of leaf compounds in the fall can influence resource buildup in plants. However, whether intraspecific differences in seedling size can affect nutrient reserve buildup is unknown. This study examined the effects of seedling size and fall fertilization on the uptake and resorption of nitrogen (N), as well as the allocation of non-structural carbohydrates (NSC) and N in cultivated Quercus variabilis Blume. Methods After the formation of terminal buds (T1), seedlings were stratified into small (shoot height < 30 cm) and large seedlings. During the hardening period, seedlings were treated with three different rates of 15N-enriched fertilizer (0, 12, or 24 mg N seedling− 1) and monitored until leaf fall (T2). Results Small seedlings had lower N resorption efficiency and resorbed proportionally less N than large seedlings. Fall fertilization notably improved N and NSC reserves, without reducing N resorption efficiency. Large seedlings allocated proportionally less N to leaves than small seedlings although both sizes seedlings absorbed similar amounts of N from fall fertilization. The priority perennial organ for NSC allocation was roots, while N allocation was dependent on the phenological growth stage of the seedling. Roots were prioritized during the rapid growth phase, while stems were prioritized during the hardening period. Conclusions Under same fertilizer regime during the growth phase, large seedlings tends to have lower N concentration and have higher resorption efficiency compare to small seedlings, fall fertilization can increase N storage in large seedlings and NSC levels in both seedling sizes, without affecting growth.

N resorption efficiency and proficiency in response to winter cold in three evergreen species

2015 ◽  
Vol 394 (1-2) ◽  
pp. 87-98 ◽  
Author(s):  
Patricia González-Zurdo ◽  
Alfonso Escudero ◽  
Sonia Mediavilla
Keyword(s):  
Resorption Efficiency ◽  
Evergreen Species ◽  
Winter Cold ◽  
N Resorption ◽  
N Resorption Efficiency

scholarly journals Effects of Nitrogen Addition and Reproductive Effort on Nutrient Resorption of a Sand-Fixing Shrub

2020 ◽  
Vol 11 ◽  
Author(s):  
Lilong Wang ◽  
Yulin Li ◽  
Yulong Duan ◽  
Jie Lian ◽  
Yongqing Luo ◽  
...  
Keyword(s):  
Reproductive Effort ◽  
Fruit Production ◽  
Nutrient Resorption ◽  
N Recovery ◽  
N Addition ◽  
Resorption Efficiency ◽  
Temporal Separation ◽  
N Resorption ◽  
N Resorption Efficiency ◽  
Leaf N

Caragana microphylla is a sand-fixing leguminous shrub with strong resistance to drought, cold, and low soil fertility. As a result, it plays an essential role in combating desertification in northern China, but little is known about its nutrient budget. Nutrient resorption is a key process in plant nutrient conservation and has marked ecological implications for plant fitness and ecosystem nutrient cycling. We studied the effects of both nitrogen (N) addition and reproductive effort on leaf N resorption of C. microphylla in a temperate semi-arid sandy land in China. The results showed that sprouting of the early leaves from over-wintered buds employs a strategy for slow returns on nutrient investment with smaller specific leaf area (SLA) and higher N resorption efficiency, whereas the late leaves, which sprout from current-year buds, employ a strategy for quick returns on nutrient investment with higher SLA and lower N resorption efficiency. N addition significantly increased the N resorption efficiency from early leaves while exerting no impact on late leaves, suggesting that the increased N recovery from early leaves is done to sustain the high N demands of late leaves. Reproductive effort did not affect the N resorption from early or late leaves due to the temporal separation between fruit production and leaf senescence. Taken together, our results demonstrate that C. microphylla has evolved different investment strategies for leaf N in early and late leaves to conserve nutrients and facilitate its growth in desertified environments.

scholarly journals Leaf N resorption efficiency and litter N mineralization rate have a genotypic tradeoff in a silver birch population

Ecology ◽  
2018 ◽  
Vol 99 (5) ◽  
pp. 1227-1235 ◽  
Author(s):  
Juha Mikola ◽  
Tarja Silfver ◽  
Ulla Paaso ◽  
Boy J. M. H. Possen ◽  
Matti Rousi
Keyword(s):  
N Mineralization ◽  
Silver Birch ◽  
Mineralization Rate ◽  
Resorption Efficiency ◽  
N Resorption ◽  
N Resorption Efficiency ◽  
Leaf N

scholarly journals High nitrogen resorption efficiency of forest mosses

2019 ◽  
Vol 125 (4) ◽  
pp. 557-563 ◽  
Author(s):  
Xin Liu ◽  
Zhe Wang ◽  
Xiaoming Li ◽  
Kathrin Rousk ◽  
Weikai Bao
Keyword(s):  
Nutrient Dynamics ◽  
Tracer Experiment ◽  
N Cycling ◽  
Sink Strength ◽  
Resorption Efficiency ◽  
Moss Species ◽  
Nitrogen Resorption ◽  
Temperature And Precipitation ◽  
Biogeochemical Models ◽  
N Resorption

Abstract Background and Aims Nutrient resorption from senescing tissue is a key mechanism for plants to conserve nutrients, and can affect the nutrient dynamics of ecosystems. Yet, our limited knowledge of nitrogen (N) resorption and release from mosses hampers our understanding of the role of mosses as N sources and, thereby, N cycling in moss-dominated ecosystems. The aims of this study were to estimate N resorption efficiency (NRE) of two moss species, identify the pathways of N release from the mosses and to provide a better understanding of N cycling and budgeting strategies of mosses. Methods The dynamics of N allocation along annual moss segments of two dominant moss species (Actinothuidium hookeri and Hylocomium splendens) were assessed in old-growth fir forests using an in situ15N tracer experiment. Key Results The NRE of A. hookeri and H. splendens was 61 and 52 %, respectively. While the mosses lost 23 and 33 % N from live tissues via leaching, 15 and 14 % of N remained in senesced tissues (&gt;3 years old) in A. hookeri and H. splendens, respectively. Conclusions Both mosses resorbed the majority of their tissue N, but a considerable amount of N was lost from live segments. Our results highlight the crucial role mosses play as N sinks in ecosystems, since N retention (resorbed and sequestered in senescent tissue) outweighed N loss via leaching. However, the sink strength depends on temperature and precipitation, which will change in a future climate. The values for NRE, leaching, etc. estimated here can help improve biogeochemical models aiming to complete N budgets for moss-abundant ecosystems.

Effects of simulated herbivory on photosynthesis and N resorption efficiency in Quercus pyrenaica Willd. saplings

Trees ◽  
2008 ◽  
Vol 22 (6) ◽  
pp. 785-793 ◽  
Author(s):  
Silla Fernando ◽  
Fleury Marina ◽  
Mediavilla Sonia ◽  
Escudero Alfonso
Keyword(s):  
Quercus Pyrenaica ◽  
Resorption Efficiency ◽  
Simulated Herbivory ◽  
N Resorption ◽  
N Resorption Efficiency

Pine caterpillar outbreak and stand density impacts on nitrogen and phosphorus dynamics and their stoichiometry in Masson pine (Pinus massoniana) plantations in subtropical China

2016 ◽  
Vol 46 (5) ◽  
pp. 601-609 ◽  
Author(s):  
Xiang-Min Fang ◽  
Lynn M. Christenson ◽  
Fang-Chao Wang ◽  
Ju-Ping Zeng ◽  
Fu-Sheng Chen
Keyword(s):  
Stand Density ◽  
Pinus Massoniana ◽  
High Density ◽  
P Availability ◽  
Low Density ◽  
Resorption Efficiency ◽  
Masson Pine ◽  
N Concentration ◽  
N Resorption ◽  
N Resorption Efficiency

Masson pine caterpillar (MPC, Dendrolimus punctatus Walker) outbreaks periodically occur in Masson pine (Pinus massoniana Lamb.) plantations in southern China; however, their effects on nutrient cycling remain unclear. In 2011, an MPC outbreak occurred in pine plantations with different stand densities, which facilitated a comparison of nitrogen (N) and phosphorus (P) cycling dynamics. Monitoring of soil and foliar nutrients from pre- to post-outbreak years (i.e., from 2010 to approximately 2012) indicated that soil NO3–-N concentration and fluxes were higher after the outbreak in low-density plantations, whereas soil NH4+-N and P availability varied minimally and were not different between the high- and low-density sites. Pine foliage responses to the MPC outbreak were dependent on stand density. At the high-density site, foliar N increased by 40% with an increase of 25% in N resorption efficiency and by approximately 200%–300% in P resorption efficiency, whereas there was an increase of 50% N concentration, a 65% increase in N resorption efficiency, and a >500% increase in P resorption efficiency at the low-density site. Overall, soil nutrients were higher in low-density than high-density plantations, whereas leaf nutrient resorption had the opposite results after an MPC outbreak. The effects of a periodic MPC outbreak could increase plant N:P stoichiometry in these plantations, particularly in the denser stands.

scholarly journals Leaf life span and nitrogen content in semideciduous forest tree species (Croton priscus and Hymenaea courbaril)

2004 ◽  
Vol 61 (4) ◽  
pp. 462-465 ◽  
Author(s):  
Claudia Regina Baptista Haddad ◽  
Damiani Pereira Lemos ◽  
Paulo Mazzafera
Keyword(s):  
Life Span ◽  
Forest Tree ◽  
Leaf Life Span ◽  
Resorption Efficiency ◽  
Hymenaea Courbaril ◽  
Specific Leaf Mass ◽  
Use Efficiency ◽  
N Resorption ◽  
N Use ◽  
N Resorption Efficiency

In comparison to deciduous species, evergreen plants have lower leaf nutrient contents and higher leaf life span, important mechanisms for nutrient economy, allowing the colonization of low fertility soils. Strategies to conserve nitrogen in two semideciduous tropical forest tree species, with different leaf life spans were analyzed. The hypothesis was the fact that the two species would present different nitrogen conservation mechanisms in relation to chemical (total nitrogen, protein, chlorophyll, and proteolytic activity), functional (leaf life span, N-use efficiency, and N-resorption efficiency), morphological (specific leaf mass) leaf characteristics, and total nitrogen in the soil. Hymenaea courbaril L. presented lower nitrogen compounds in leaves, longer leaf life span, higher N-use efficiency, and higher specific leaf mass, while absorbing proportionally less nitrogen from the soil than Croton priscus Croizat. These characteristics can contribute for a better nitrogen economy strategy of H. courbaril. No relationship was found between leaf life span and N resorption efficiency, nor between leaf life span, protease activity and nitrogen mobilization. The electrophoretic profiles of proteolytic enzymes in young leaves of the two species presented more bands with enzymatic activity than other kinds of leaves.

Sign in / Sign up

Export Citation Format

Share Document