Foliar nitrogen, phosphorus and potassium concentrations of Scots pine in drained mires in Finland

Abstract:Leaf litter is an important source of nutrients to tropical forest trees, but its importance for understorey seedling growth is not well understood. Seedlings of Licania platypus (n = 190) and Coussarea curvigemmia (n = 304) were transplanted into deeply shaded forest plots in Panama having received 2 y of litter addition or removal and 7 y of fertilization with nitrogen, phosphorus and potassium combined, and their growth and foliar nutrients measured after 13 and 6 mo respectively. Licania platypus growing in litter addition and removal plots had faster height growth and slower leaf growth respectively than in control plots; C. curvigemmia showed no significant effects apart from lower survival in litter addition plots. These effects may be driven by soil nutrients, as suggested by differences in foliar nitrogen and potassium (but not phosphorus) concentrations, and by a pot experiment in a shadehouse using Ochroma pyramidale seedlings, which showed higher leaf area in soils from litter-addition plots, although seedling dry weight was higher only in fertilized soils. Overall, these results show that for one of two species, understorey seedling growth was increased by 2 y of doubled litterfall, and thus that they were probably nutrient limited even in the relatively fertile soils of this semi-deciduous tropical forest.

Download Full-text

Macronutrient Stocks in Scots Pine Stands of Different Densities

Forests ◽

10.3390/f9100593 ◽

2018 ◽

Vol 9 (10) ◽

pp. 593 ◽

Cited By ~ 1

Author(s):

Andrzej Węgiel ◽

Ernest Bielinis ◽

Krzysztof Polowy

Keyword(s):

Scots Pine ◽

Aboveground Biomass ◽

Nutrient Balance ◽

Stand Density ◽

Nutrient Balances ◽

Calcium Magnesium ◽

Phosphorus And Potassium ◽

Whole Tree Harvesting ◽

Nitrogen Phosphorus ◽

Whole Tree

A positive nutrient balance is crucial to sustaining forest productivity. Differences in stand densities usually mean different aboveground biomass stocks and different proportions of tree compartments. These differences can be reflected in the different macronutrient stocks between stands of different densities, because various tree compartments have different element concentrations. In this study, 82-year-old stands of Scots pine were compared, and specifically, the concentrations of the elements in tree compartments and the amounts of macronutrients in aboveground biomass were compared. The nutrients considered in this study were nitrogen, phosphorus, potassium, calcium, magnesium, and sulfur. A positive correlation between stand density and the level of stored macronutrients was found for nitrogen, phosphorus, and potassium. This result means that forest managers can influence nutrient balances by regulating stand densities or by harvesting methods (SOH: stem-only harvesting or WTH: whole-tree harvesting).

Download Full-text

Effects of Water-Nitrogen Interaction on Absorption, Translocation and Distribution of Nitrogen, Phosphorus, and Potassium in Rice

ACTA AGRONOMICA SINICA ◽

10.3724/sp.j.1006.2010.00655 ◽

2010 ◽

Vol 36 (4) ◽

pp. 655-664 ◽

Cited By ~ 6

Author(s):

Yong-Jian SUN ◽

Yuan-Yuan SUN ◽

Xu-Yi LI ◽

Rong-Ping ZHANG ◽

Xiang GUO ◽

...

Keyword(s):

Phosphorus And Potassium ◽

Nitrogen Phosphorus

Download Full-text

Absorption and Distribution of Nitrogen,Phosphorus and Potassium inScutellaria baicalensisGeorgi and Their Relationships to Dry Matter Accumulation

Plant Science Journal ◽

10.3724/sp.j.1142.2012.10079 ◽

2012 ◽

Vol 30 (1) ◽

pp. 79 ◽

Cited By ~ 1

Author(s):

Xian-Yan CAO ◽

Wei-Ling WANG ◽

Fu-Li XU ◽

Jing WANG ◽

Xiao-Hu ZHANG

Keyword(s):

Dry Matter ◽

Dry Matter Accumulation ◽

Phosphorus And Potassium ◽

Nitrogen Phosphorus

Download Full-text

Effects of serpentinite fertilizer on the chemical properties and enzyme activity of young spruce soils

International Agrophysics ◽

10.1515/intag-2016-0015 ◽

2016 ◽

Vol 30 (4) ◽

pp. 401-414 ◽

Cited By ~ 2

Author(s):

Ewa Błońska ◽

Kazimierz Januszek ◽

Stanisław Małek ◽

Tomasz Wanic

Keyword(s):

Enzyme Activity ◽

Chemical Properties ◽

Molar Ratio ◽

Tree Roots ◽

Forest Zone ◽

Negative Effect ◽

Phosphorus And Potassium ◽

One Year ◽

Nitrogen Phosphorus ◽

Experimental Plots

AbstractThe experimental plots used in the study were located in the middle forest zone (elevation: 900-950 m a.s.l.) on two nappes of the flysch Carpathians in southern Poland. The aim of this study was to assess the effects of serpentinite in combination with nitrogen, phosphorus, and potassium fertilizers on selected chemical properties of the soil and activity of dehydrogenase and urease in the studied soils. All fertilizer treatments significantly enriched the tested soils in magnesium. The use of serpentinite as a fertilizer reduced the molar ratio of exchangeable calcium to magnesium, which facilitated the uptake of magnesium by tree roots due to competition between calcium and magnesium. After one year of fertilization on the Wisła experimental plot, the pH of the Ofh horizon increased, while the pH of the mineral horizons significantly decreased. Enrichment of serpentinite with nitrogen, phosphorus, and potassium fertilizers stimulated the dehydrogenase activity in the studied organic horizon. The lack of a negative effect of the serpentinite fertilizer on enzyme activity in the spruce stand soil showed that the concentrations of the heavy metals added to the soil were not high enough to be toxic and indicated the feasibility of using this fertilizer in forestry.

Download Full-text

Effects of nitrogen, phosphorus and potassium rates on Microdochium patch

itsrj ◽

10.1002/its2.28 ◽

2021 ◽

Author(s):

Brian McDonald ◽

Alec Kowalewski ◽

Clint Mattox ◽

Emily Braithwaite ◽

Charles Schmid

Keyword(s):

Phosphorus And Potassium ◽

Nitrogen Phosphorus

Download Full-text

Phytotoxic effects of invasive Ageratina adenophora on two native subtropical shrubs in Nepal

Scientific Reports ◽

10.1038/s41598-021-92791-y ◽

2021 ◽

Vol 11 (1) ◽

Author(s):

Tej Bahadur Darji ◽

Barsha Adhikari ◽

Seeta Pathak ◽

Shristi Neupane ◽

Lal B. Thapa ◽

...

Keyword(s):

Low Ph ◽

Potential Mechanism ◽

Phytotoxic Effects ◽

Seedling Length ◽

Ageratina Adenophora ◽

Ir Analysis ◽

Allelopathic Interference ◽

Phosphorus And Potassium ◽

Native Shrubs ◽

Nitrogen Phosphorus

AbstractThe response of native plants to allelopathic interference of invasive species may differ from species to species. In this study, the phytotoxic effects of Ageratina adenophora were tested on two native shrubs (Osbeckia stellata and Elsholtzia blanda) of Nepal. Both the shrubs were grown in pots under treatments of A. adenophora fresh leaves and root leachates, and litter. Then, the seedling length and biomass were compared among the treatments. The results show that A. adenophora litter has stimulatory effects but the leachates from fresh leaves and root are phytotoxic to the growth and development of native shrubs. Infrared Spectroscopy (IR) analysis confirmed the presence of O–H (Hydroxyl), N–H (Amines), C≡C (Alkynes), and C–H stretching (Aromatic) or C–O–C stretching (Ethers) in the leachates representing harmful allelochemicals. The invaded soil by A. adenophora had low pH and a high amount of organic matter, total nitrogen, phosphorus, and potassium than the uninvaded soil. The results indicate that the native O. stellata and E. blanda are harmed by A. adenophora in nature by leaching of allelochemicals and probably by reducing the soil pH. Overall, this study has provided valuable insights regarding the effects of A. adenophora invasion on native shrubs and revealing the potential mechanism of its invasiveness.

Download Full-text