Influence of added nutrient on the seasonal variation of algal growth potential of Mt Bold reservoir, South Australia

1982 ◽  
Vol 33 (3) ◽  
pp. 475 ◽  
Author(s):  
GG Ganf
Keyword(s):  
Algal Growth ◽  
South Australia ◽  
Euphotic Zone ◽  
Growth Potential ◽  
Nutrient Depletion ◽  
Nitrogen And Phosphorus ◽  
Nutrient Additions ◽  
Two Temperatures ◽  
Enrichment Experiments ◽  
Nutrient Analyses

Bioassay experiments with the natural phytoplankton assemblage showed that the major nutrient input to Mt Bold reservoir, South Australia, occurred with the onset of winter rains. Growth potential within the euphotic zone generally increased from June to November but was undetectable from December to March when the autumn overturn circulated nutrient-rich water from the hypolimnion to cause an increase in growth. Subsequently, the growth potential fell and did not rise until the onset of winter rains. Routine enrichment experiments with phosphorus, nitrogen and Na-EDTA substantially increased the growth potential above the control during periods of suspected nutrient depletion. During periods of nutrient depletion, the influence of 10 single and 45 dual nutrient additions showed that only the combined addition of nitrogen and phosphorus caused a significant increase in growth potential. To investigate further the influence of nitrogen and phosphorus on algal growth, factorial nutrient-enrichment experiments using five levels of both nitrogen and phosphorus and three of Na-EDTA at two temperatures (11 and 20�C) were conducted. The work is discussed in relation to the routine nutrient analyses done by the Engineering and Water Supply Department of South Australia.

Effect of Nutrient Additions on Lower Trophic Levels of an Oligotrophic Lake with a Seasonal Deep Chlorophyll Maximum

1990 ◽  
Vol 47 (2) ◽  
pp. 262-273 ◽  
Author(s):  
Ken S. Shortreed ◽  
John G. Stockner
Keyword(s):  
Inorganic Nitrogen ◽  
Euphotic Zone ◽  
Fold Increase ◽  
Trophic Levels ◽  
Deep Chlorophyll Maximum ◽  
Nitrogen And Phosphorus ◽  
Chlorophyll Maximum ◽  
Nutrient Additions ◽  
Prominent Component ◽  
Dominant Member

Inorganic nitrogen and phosphorus were added to the surface of selected areas of Sproat Lake, Vancouver Island, British Columbia for varying periods in 1985 and 1986. The lake is monomictic, oligotrophic, and for much of each year has a deep chlorophyll maximum (DCM) located near the bottom of the euphotic zone (20–25 m). Epilimnetic chlorophyll concentrations are low (ca. 0.5 μg∙L−1) in summer, and DCM concentrations are from three to 10 times higher. The diatom Rhizosolenia eriensis was a dominant species in the epilimnion in spring and at the DCM for much of the year, but was rare in the epilimnion during summer, and consequently was not affected by the nutrient additions. Cyclotella spp. were also abundant in spring, were a prominent component of the DCM, and increased in abundance during nutrient additions. The cyanobacterium Synechococcus was the dominant member of the autotrophic picoplankton community and during the nutrient additions densities reached 300 000∙mL−1 (a 10-fold increase). Bacterioplankton numbers also increased during nutrient additions, at times exceeding 3.0 × 106∙mL−1. The DCM was formed and maintained by sinking cells, by occasional active photosynthesis at the DCM, and by an increase in chlorophyll/cell.

Selection of water source for water transfer based on algal growth potential to prevent algal blooms

2021 ◽  
Vol 103 ◽  
pp. 246-254
Author(s):  
Yongjun Song ◽  
Jing Qi ◽  
Le Deng ◽  
Yaohui Bai ◽  
Huijuan Liu ◽  
...  
Keyword(s):  
Algal Blooms ◽  
Algal Growth ◽  
Water Source ◽  
Water Transfer ◽  
Growth Potential ◽  
Algal Growth Potential ◽  
Selection Of

Distribution of Biomass, Nitrogen, Phosphorus and Other Nutrients in Banksia marginata and B. ornata Shoots of Different Ages After Fire.

1986 ◽  
Vol 34 (6) ◽  
pp. 709 ◽  
Author(s):  
RH Groves ◽  
PJ Hocking ◽  
A Mcmahon
Keyword(s):  
National Park ◽  
Dry Matter ◽  
Lateral Roots ◽  
South Australia ◽  
Distribution Patterns ◽  
Nutrient Accumulation ◽  
Nitrogen And Phosphorus ◽  
Vegetative Organs ◽  
Western Victoria ◽  
Nitrogen Phosphorus

The heathland form of Banksia marginata Cav. regenerates rarely from seed but commonly by resprout- ing from buds on lateral roots, whereas Banksia ornata F. Muell. regenerates only from seed, usually released after fire. The two species co-occur in heath vegetation on nutrient-poor soils in south-eastern South Australia and western Victoria. Shoots were sampled from stands of B. marginata aged from 1 to 25 years and of B. ornata aged from 1 to 50+ years after fire in the Little Desert National Park, western Victoria. B. marginata, the resprouter, distributed a greater proportion of the total shoot dry matter and content of all nutrients to vegetative growth over its shorter life span than B. ornata, the non-sprouter. About 50% of the total phosphorus in B. ornata shoots at 50+ years was present in cones (including seeds) compared with only about 20% in B. marginata shoots at a comparable stage of senescence (25 years). This difference between the species was also true to a lesser degree for nitrogen. There were considerable differences between other nutrients in their distribution patterns in shoots. Nutrients could be grouped together on the basis of distribution in shoots more satisfactorily than on presumed physio- logical roles. Stems were major sites of nutrient accumulation in both species. The content of a particular nutrient in seeds as a proportion of the content in the living parts of the shoot ranged from 0.03% (Na, Mn) to 2.0% (P) in B. marginata, and from 0.3% (Na) to as high as 31% (P) in B. ornata. Concen- trations of all nutrients except sodium were much higher in seeds than in the woody cones or vegetative organs of both species; seeds of B. ornata were particularly rich in calcium and manganese. We conclude that the different patterns of distribution of biomass and nutrients, especially nitrogen and phosphorus, within shoots of the two species reflect their different regenerative modes after fire. Introduction Phosphorus and, to a lesser extent, nitrogen limit the growth of sclerophyllous shrubs on nutrient-poor soils in southern Australia

scholarly journals Responses of soil microbial communities and enzyme activities to nitrogen and phosphorus additions in Chinese fir plantations of subtropical China

2015 ◽  
Vol 12 (13) ◽  
pp. 10359-10387 ◽  
Author(s):  
W. Y. Dong ◽  
X. Y. Zhang ◽  
X. Y. Liu ◽  
X. L. Fu ◽  
F. S. Chen ◽  
...  
Keyword(s):  
Microbial Community ◽  
Microbial Communities ◽  
Enzyme Activities ◽  
Microbial Community Composition ◽  
Soil Microbial Communities ◽  
Chinese Fir ◽  
Subtropical China ◽  
Nitrogen And Phosphorus ◽  
Soil Microbial ◽  
Nutrient Additions

Abstract. Nitrogen (N) and phosphorus (P) additions to forest ecosystems are known to influence various above-ground properties, such as plant productivity and composition, and below-ground properties, such as soil nutrient cycling. However, our understanding of how soil microbial communities and their functions respond to nutrient additions in subtropical plantations is still not complete. In this study, we added N and P to Chinese fir plantations in subtropical China to examine how nutrient additions influenced soil microbial community composition and enzyme activities. The results showed that most soil microbial properties were responsive to N and/or P additions, but responses often varied depending on the nutrient added and the quantity added. For instance, there were more than 30 % greater increases in the activities of β-Glucosidase (βG) and N-acetyl-β-D-glucosaminidase (NAG) in the treatments that received nutrient additions compared to the control plot, whereas acid phosphatase (aP) activity was always higher (57 and 71 %, respectively) in the P treatment. N and P additions greatly enhanced the PLFA abundanceespecially in the N2P treatment, the bacterial PLFAs (bacPLFAs), fungal PLFAs (funPLFAs) and actinomycic PLFAs (actPLFAs) were about 2.5, 3 and 4 times higher, respectively, than in the CK. Soil enzyme activities were noticeably higher in November than in July, mainly due to seasonal differences in soil moisture content (SMC). βG or NAG activities were significantly and positively correlated with microbial PLFAs. There were also significant relationships between gram-positive (G+) bacteria and all three soil enzymes. These findings indicate that G+ bacteria is the most important microbial community in C, N, and P transformations in Chinese fir plantations, and that βG and NAG would be useful tools for assessing the biogeochemical transformation and metabolic activity of soil microbes. We recommend combined additions of N and P fertilizer to promote soil fertility and microbial activity in this kind of plantation.

Akinete Germination and Algal Growth Potential Test of Cyanobacterium Anabaena circinalis on Different Waters in Lake Paldang

2015 ◽  
Vol 48 (4) ◽  
pp. 287-295 ◽  
Author(s):  
Myung-Hwan Park ◽  
Byung-Jin Lim ◽  
Wan-Bum Seo ◽  
Chae-Hong Park ◽  
Keon-Hee Kim ◽  
...  
Keyword(s):  
Algal Growth ◽  
Growth Potential ◽  
Algal Growth Potential ◽  
Cyanobacterium Anabaena ◽  
Potential Test ◽  
Anabaena Circinalis

Liebig’s Law and Haber’s Tragedy

Dead Zones ◽  
2021 ◽  
pp. 89-105
Author(s):  
David L. Kirchman
Keyword(s):  
Gulf Of Mexico ◽  
Chesapeake Bay ◽  
19Th Century ◽  
Algal Growth ◽  
Oxygen Depletion ◽  
Nitrogen And Phosphorus ◽  
Limiting Nutrient ◽  
Von Liebig ◽  
The Baltic ◽  
Fritz Haber

The fertilizers commonly used by gardeners have many ingredients, but the biggest two are nitrogen and phosphorus, either of which can limit plant and algal growth. The idea that only one nutrient limits growth is encapsulated by Liebig’s Law of the Minimum, named after Justus von Liebig, a 19th-century German chemist. Liebig is also called the “father of fertilizer” because of his work on formulating and promulgating commercial fertilizers. However, he wasn’t the first to discover the Law, and he was wrong about the most important ingredient of fertilizers. This chapter outlines the arguments among limnologists, oceanographers, and geochemists about whether nitrogen or phosphorus sets the rate of algal growth and thus production of the organic material that drives oxygen depletion. The chapter discusses that the limiting nutrient varies with the type of aquatic habitat. In dead zones like the Gulf of Mexico, parts of the Baltic Sea, and Chesapeake Bay, bioassay experiments have shown that nitrogen is usually limiting. The nitrogen necessary for fertilizer and ammunitions comes from the Haber-Bosch process. The chapter reviews the life of one of the two German inventors, Fritz Haber, and how it was full of contradictions if not tragedy.

scholarly journals Plankton Food Web Responses to Experimental Nutrient Additions in a Subtropical Lake

2006 ◽  
Vol 6 ◽  
pp. 827-833 ◽  
Author(s):  
Karl E. Havens ◽  
Therese L. East
Keyword(s):  
Food Web ◽  
Microbial Food Web ◽  
Cylindrospermopsis Raciborskii ◽  
Variable Response ◽  
Nitrogen And Phosphorus ◽  
Subtropical Lake ◽  
Nutrient Additions ◽  
Cyanobacteria Blooms ◽  
Enclosure Experiments

During two controlled enclosure experiments using water from a subtropical lake, the plankton food web displayed a highly variable response to combined addition of nitrogen and phosphorus. In July, the nutrients stimulated growth ofCylindrospermopsis raciborskii, and the biomass of macrozooplankton and microbial food web components did not increase. In October, the same addition of nutrients stimulated growth of small edibleLyngbyaspp., and there were coincident increases in biomass of macrozooplankton and components of the microbial web. Past generalizations that cyanobacteria blooms inhibit growth of other food web components may not always hold true.

Sign in / Sign up

Export Citation Format

Share Document