Altitudinal variation in leaf mass per unit area, leaf tissue density and foliar nitrogen and phosphorus content along an Amazon-Andes gradient in Peru

2009 ◽  
Vol 2 (3) ◽  
pp. 243-254 ◽  
Author(s):  
Martine J. van de Weg ◽  
Patrick Meir ◽  
John Grace ◽  
Owen K. Atkin
Keyword(s):  
Phosphorus Content ◽  
Unit Area ◽  
Leaf Tissue ◽  
Nitrogen And Phosphorus ◽  
Altitudinal Variation ◽  
Foliar Nitrogen ◽  
Tissue Density ◽  
Leaf Mass

Removal Effect of Ditch Pond Wetlands on Non-Point Source Pollutants from Agricultural Drainage

2014 ◽  
Vol 955-959 ◽  
pp. 2513-2516
Author(s):  
Han Feng Xiong
Keyword(s):  
Phosphorus Content ◽  
Unit Area ◽  
Removal Rate ◽  
Agricultural Drainage ◽  
Nitrogen Absorption ◽  
Phragmites Communis ◽  
Total Removal ◽  
Nitrogen And Phosphorus ◽  
Runoff Water ◽  
Zizania Latifolia

Ditch pond wetland systems have the capacity to remove and purify non-point pollutants of nitrogen and phosphorus from agricultural drainage. This paper measured the changes of nitrogen and phosphorus content in ditches, ponds of runoff water, aquatic plants and sediment. The results show that ditch, pond has the very good intercept and removing effect for nitrogen and phosphorus. The total removal rate of TN and TP were 61.13% and 63.08% in ditch pond wetlands. Phragmites communis, Zizania latifolia, reed nitrogen absorption per unit area respectively were 2.468 g/m2, 1.795 g/m2, 2.174 g/m2. Phragmites communis, Zizania latifolia, reed absorb phosphorus amount per unit area respectively were 0.643 g/m2, 0.351 g/m2, 0.338 g/m2. The TN content and TP content of sediment is increase from ditches1to ditches3. TN content of sediment at pond import is higher than at pond export. TP content changed little in the pond sediment.

scholarly journals Influence of Phosphorous and Foliar Nitrogen on the Growth, Quality and Yield of Kasuri Methi (Trigonella corniculata L.)

2022 ◽  
Author(s):  
Abhinav Kumar Yadav ◽  
S.P. Singh ◽  
D.K. Yadav ◽  
Govind Kumar Yadav ◽  
Kuldeep Singh ◽  
...  
Keyword(s):  
Phosphorus Content ◽  
Foliar Application ◽  
Growth Parameters ◽  
Foliar Spray ◽  
Nitrogen And Phosphorus ◽  
Dry Land ◽  
Foliar Nitrogen ◽  
Lower Productivity ◽  
Four Levels ◽  
Growth Quality

Background: Nitrogen and phosphorus are amongst fundamental macronutrients, which are crucial for the growth and development of plant. Soils of dry land of central Rajasthan are deficit in nitrogen and phosphorus content which leads to lower productivity of kasuri methi. Therefore, adequate supply of nitrogen (foliar spray) and phosphorus could enhance productivity of kasuri methi. Methods: The experiment consisted of sixteen treatment combinations including four levels of phosphorus (control, 20, 40 and 60 kg/ha) and four levels of foliar application of nitrogen (control, 1.0, 1.5 and 2.0%). They were under taken in FRBD with three replications. Result: Growth parameters and yield of fresh and dried leaves of the crop increased almost linearly with increasing levels of phosphorus and foliar application of nitrogen. The result indicated that application of phosphorus 60 kg/ha and foliar nitrogen @ 2.0% to the kasuri methi crop significantly increased the plant height (cm) and leaf area per plant (cm2) at each harvest, number of nodules per plant (58.17 and 53.33, respectively) and chlorophyll content (2.32 and 2.39 mg/100 g, respectively), fresh leaves yield (139.1 and 141.66 q/ha, respectively), dry leaves yield (20.01 and 22.38 q/ha, respectively), protein content in leaves (5.28 and 5.75%, respectively) and ascorbic acid in leaves (218.15 and 222.42 mg/100 g, respectively).

Assessment of bioavailable nitrogen and phosphorus content in the sediments of Indian mangroves

2021 ◽  
Author(s):  
Yudhistir Reddy ◽  
Dipnarayan Ganguly ◽  
Gurmeet Singh ◽  
Mamidala Harikrishna Prasad ◽  
Paneer Selvam Arumughan ◽  
...  
Keyword(s):  
Phosphorus Content ◽  
Nitrogen And Phosphorus ◽  
Indian Mangroves

Pores versus spores: competition between photosynthesis and reproduction is constrained by leaf mass per unit area (LMA) in ferns

2020 ◽  
Author(s):  
K G Srikanta Dani ◽  
Jose Mathew ◽  
T M Nila-Mohan ◽  
Raju Antony ◽  
S Suresh ◽  
...  
Keyword(s):  
Life Histories ◽  
Resource Constraints ◽  
Time Window ◽  
Unit Area ◽  
Stomatal Density ◽  
High Fertility ◽  
Leaf Lifespan ◽  
Trade Off ◽  
Terrestrial Species ◽  
Leaf Mass

Abstract Diversity in plant life histories is primarily that found in the rate and duration of photosynthetic (vegetative) and reproductive growth. However, direct evidence for an anticipated trade-off between photosynthesis and reproduction is lacking in any plant lineage. Ferns allocate leaf space and resources to both photosynthesis and reproduction, potentially leading to competition for leaf resources between stomatal pores and reproductive spores. We hypothesized that a trade-off between stomatal density (StD; a proxy for photosynthetic capacity) and sporangial density (SpD; a measure of fertility) has evolved in monomorphic ferns due to the common space, time and resource constraints imposed by a highly conserved and globally low leaf mass per unit area (LMA) in ferns, where any increase in LMA indicated greater construction cost and longer leaf lifespan. We measured LMA, StD and SpD in 40 fern species in India that represented both monomorphic and dimorphic conditions from both terrestrial and epiphytic habits. Both StD and SpD showed a 50-fold range in monomorphic species whereas LMA was more conserved (six-fold range). LMA of terrestrial ferns was significantly lower than that of epiphytic ferns. Linear regression between LMA and StD was significantly positive in dimorphic terrestrial ferns (showing the lowest LMA among all ferns) and significantly negative in monomorphic epiphytic ferns (showing the highest LMA among all ferns). Dimorphic terrestrial ferns were highly fecund on their fertile leaves and showed a significantly higher StD to LMA ratio on their sterile leaves compared to monomorphic terrestrial ferns. Dimorphic ferns seem to maximize both StD and SpD by physical separation of photosynthesis and reproduction, and their characteristically low LMA (shorter leaf lifespan = smaller time window) potentially selects for high StD and high fertility. The regression between StD and SpD in monomorphic ferns was significantly linear and positive, although comparisons among closely related species (within families) showed negative correlations when both StD and SpD were high, captured also by a significant quadratic regression between StD and SpD in monomorphic ferns. Monomorphic terrestrial species bearing more spores per stomata showed relatively low LMA whereas those producing fewer spores per stomata possessed leaves with relatively high LMA. Monomorphic epiphytes produced as many spores as terrestrial species but showed significantly low StD for their high LMA. We discuss the evolutionary reasons behind these trends and conclude that monomorphic terrestrial ferns with high LMA (long leaf lifespan) tend to prioritize photosynthesis over reproduction, while monomorphic epiphytes (always high LMA) are significantly more fertile for lower photosynthesis. The role of LMA in framing the rules of competition between stomata and sporangia in monomorphic ferns provides a template for how photosynthesis may directly or indirectly influence reproductive strategies (and vice versa) in all land plants.

scholarly journals Investigation of the decomposition and leaching dynamics of Salix, Populus and mixed leaves in the area of Lake Balaton and Kis-Balaton Wetland

2019 ◽  
pp. 119-124
Author(s):  
Brigitta Simon ◽  
Tamás Kucserka ◽  
Angéla Anda
Keyword(s):  
Total Nitrogen ◽  
Phosphorus Content ◽  
Mesh Size ◽  
Common Species ◽  
Coastal Vegetation ◽  
Lake Balaton ◽  
Decomposition Rates ◽  
Nitrogen And Phosphorus ◽  
Major Nutrient ◽  
Nitrogen Contents

In lakes and wetlands, leaf litter input from the coastal vegetation represents a major nutrient load and plays a basic structural and functional role in several ecosystems. In Hungary, at the banks of lakes and wetlands, Salix and Populus trees are the most common species. In an experiment in Lake Balaton and Kis-Balaton Wetland between 16 November 2017 to and 3 June 2018, the decomposition rates and leaching dynamics of Salix, Populus and mixed leaves (50% Salix and 50% Populus) were investigated. Total nitrogen and phosphorus content of biomass samples were measured at the beginning and end of the experiment for the leaching dynamics experiment. We found that litter mass losses (Salix, Populus and mixed leaves) were not significantly different between the two mesh size litterbags and between Lake Balaton and Kis-Balaton Wetland. Different amounts of the total nitrogen and phosphorus leaching from Salix, Populus and mixed leaves were detected. The total nitrogen contents of the plant samples were around 8-18% at the end of the investigated period. Slightly higher values were measured compared to phosphorous (27-29%).

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