Effect of Nitrogen Nutrition Upon Sugar Content and Dry Weight of Juvenile Lodgepole Pine and White Spruce

Etter, Harold M.

doi:10.1139/x72-066

Cited by 15 publications

(4 citation statements)

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“…Although we have not determined the N mineral processes in this study, previous studies have frequently found that introducing N-xing trees into Eucalyptus plantations can stimulate microbial activity(Pereira et al 2018(Pereira et al , 2019 to increase the rate of N mineralization(Voigtlaender et al 2012(Voigtlaender et al , 2019. Alternatively, we indeed found NH 4 + -N was positively correlated with the N accumulation of Eucalyptus in both seasons, while the similar relationship was only occurs in the wet-hot season for NO 3 − -N. This result is consistent with the observation that the growth of many forest plant species depend on ammonium(Eiter 1972).…”

supporting

confidence: 92%

Introduction of Dalbergia Odorifera Enhances Nitrogen Absorption on Eucalyputs Through Stimulating Microbially Mediated Soil Nitrogen-cycling

Yao

Zhang

Zhou

et al. 2021

Preprint

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Background: There is the substantial evidence that Eucalyptus for nitrogen (N) absorption and increasing the growth benefit from the introduction of N-fixing species, but the underlying mechanisms for microbially mediated soil N cycling remains unclear. Methods: We investigated the changes of soil pH, soil water content (SWC), soil organic carbon (SOC), total N (TN), inorganic N (NH4+-N and NO3--N), microbial biomass and three N-degrading enzyme activities as well as the biomass and N accumulation of Eucalyptus between a pure Eucalyptus urophylla × grandis plantation (PP) and a mixed Dalbergia odorifera and Eucalyptus plantation (MP) in Guangxi Zhuang Autonomous Region, China. Results: Compared with the PP site, soil pH, SWC, SOC and TN in both seasons were significantly higher at the MP site, which in turn enhanced microbial biomass and the activities of soil N-degrading enzymes. The stimulated microbial activity at the MP site likely accelerated soil N mineralization, providing more available N (NH4+-N in both seasons and NO3--N in the wet-hot season) for Eucalyptus absorption. Overall, the N accumulation of Eucalyptus at the MP site was increased by 19.7% and 21.9%, promoting the biomass increases of 15.1% and 19.2% in the dry-cold season and wet-hot season, respectively.Conclusion: Our results reveal the importance of microbially mediated soil N cycling in the N absorption on Eucalyputs. Introduction of D. odorifera can enhance N absorption and growth on Eucalyputs, improve soil N availability and increased soil C sequestration, which hence can be considered to be an effective sustainable management option of Eucalyptus plantations.

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supporting

confidence: 92%

Introduction of Dalbergia Odorifera Enhances Nitrogen Absorption on Eucalyputs Through Stimulating Microbially Mediated Soil Nitrogen-cycling

Yao

Zhang

Zhou

et al. 2021

Preprint

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“…Eucalyptus seems to be more sensitive to N in the form of ammonium than other N forms [4]. This finding is consistent with the observation that the growth of many forest plant species is greatest when ammonium is supplied [48]. He et al suggested that N transfer was greater from Casuarina to Eucalyptus when N was supplied as 15 NH 4 + -N rather than 15 NO 3 − -N [22].…”

Section: Soil N Concentration and The Growth Duration Of Plants Are The Main Factors Affecting N Transfersupporting

confidence: 75%

Bidirectional Nitrogen Transfer and Plant Growth in a Mixed Plantation of N2-Fixing Species and Eucalyptus urophylla × E. grandis under Different N Applications

Yao

Goodale

Yang

et al. 2021

Forests

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N2-fixing species play a crucial role in mixed-plantations as they improve stand productivity. To quantify the N transfer from N2-fixing species to Eucalyptus (Eucalyptus urophylla × E. grandis) in N2-fixing species/Eucalyptus plantations, we established a pot experiment and confirmed the occurrence of this process under natural conditions. The 15N was traced in labeled species as well as in neighboring tree species after labeling, and the growth was evaluated in short-term natural trials. Our results showed that a bidirectional N transfer occurred. The amount of net N transfer was 21.8–127.0 mg N plant−1, which was equal to 1.5–21.2% of the total nitrogen (TN) that accumulated in Eucalyptus plants under pot conditions, was transferred from Dalbergia odorifera to Eucalyptus. The amount of N transferred significantly decreased with the increasing N application rate but increased with time after labeling. Compared with the results for the Eucalyptus monocrop, the soil N concentration (including NO3−-N and NH4+-N) greatly improved when D. odorifera was introduced together with Eucalyptus under both field and pot conditions. Furthermore, the results under field conditions were consistent with the results of the pot experiment. The dry matter (DM) yield (14.5–16.4%) and the N content (5.1–9.6%) in Eucalyptus increased when mixed together with D. odorifera, but the N content in and DM yield of D. odorifera slightly decreased. It is concluded that the N transfer between Eucalyptus and D. odorifera is a much more important dynamic process than previously recognized, and Eucalyptus and legume intercropping is a successful management practice because N transfer provides a significant amount of N required for Eucalyptus productivity.

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“…Sugars play a prominent role in plant metabolism as sources of energy and carbon skeletons for the synthesis of numerous other metabolic and structural constituents (Etter, 1972). Starch in woody tissues acts mainly in storage and is utilized in winter metabolism (Würth et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

EFFECT OF LATE-SEASON FERTILIZATION ON NUTRIENT RESERVES AND CARBOHYDRATE ACCUMULATION IN BAREROOTLARIX OLGENSISSEEDLINGS

Wei

et al. 2014

Journal of Plant Nutrition

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2 It is not clear about the interactive effects of nitrogen, phosphorus, and potassium additions on carbohydrate accumulation in tree seedlings in the late-season of fall. In late September of 2009, 0 or 60 kg nitrogen ha −1 urea (46-0-0) was applied with 30 and 60 kg phosphorus ha −1 potassium hydrogen phosphate (0-41-45) to transplanted bareroot Changbai larch (Larix olgensis Henry) seedlings. One month after first fertilization, seedlings receiving nitrogen addition had higher nitrogen and phosphorus, but lower potassium, concentrations in combined stems and roots. The higher rate phosphorus and potassium treatment increased nitrogen concentration in coarse roots (diameter > 5 mm) without nitrogen addition and improved potassium reserves. Fertilization did not affect seedling growth and whole-plant carbohydrate accumulation. In conclusion, we recommend a fertilizer regime of 60 kg N ha −1 urea and 60 kg phosphorus ha −1 potassium hydrogen phosphate applied in fall to improve nutrient reserves and increase root carbohydrate accumulation in Changbai larch seedlings.

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Effect of Nitrogen Nutrition Upon Sugar Content and Dry Weight of Juvenile Lodgepole Pine and White Spruce

Cited by 15 publications

References 0 publications

Introduction of Dalbergia Odorifera Enhances Nitrogen Absorption on Eucalyputs Through Stimulating Microbially Mediated Soil Nitrogen-cycling

Introduction of Dalbergia Odorifera Enhances Nitrogen Absorption on Eucalyputs Through Stimulating Microbially Mediated Soil Nitrogen-cycling

Bidirectional Nitrogen Transfer and Plant Growth in a Mixed Plantation of N2-Fixing Species and Eucalyptus urophylla × E. grandis under Different N Applications

EFFECT OF LATE-SEASON FERTILIZATION ON NUTRIENT RESERVES AND CARBOHYDRATE ACCUMULATION IN BAREROOTLARIX OLGENSISSEEDLINGS

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