Related Experiment Video
Updated: Jul 19, 2026
09:17
Investigation of Plant Interactions Across Common Mycorrhizal Networks Using Rotated Cores
Published on: March 26, 2019
Differences in plant function in phosphorus- and nitrogen-limited mangrove ecosystems.
Catherine E Lovelock1, Ilka C Feller, Marilyn C Ball
1Centre for Marine Studies, University of Queensland, St Lucia Q 4072, Australia. c.lovelock@uq.edu.au
The New Phytologist
|November 7, 2006
Summary
Mangrove plants limited by phosphorus (P) show reduced water uptake and growth compared to nitrogen (N)-limited plants. Fertilizing P-limited mangroves improved their physiological and hydraulic functions, unlike N-limited ones.
Area of Science:
- Ecology
- Plant Physiology
- Environmental Science
Background:
- Mangrove ecosystems exhibit nutrient limitations, primarily nitrogen (N) or phosphorus (P), making them susceptible to nutrient pollution.
- Nutrient enrichment can impact mangroves differently based on whether N or P availability limits growth, due to distinct plant physiological responses.
Purpose of the Study:
- To investigate the differential physiological responses of the mangrove species Avicennia germinans to N- and P-limitation and fertilization.
- To test the hypothesis that water uptake, transport, and hydraulic architecture limit productivity in P-limited mangroves, but not in N-limited ones.
Main Methods:
- Studied Avicennia germinans in N-limited and P-limited field sites.
- Assessed physiological traits including leaf water potential, stomatal conductance, and photosynthetic carbon assimilation.
- Measured xylem conductivity to evaluate hydraulic architecture.
Main Results:
- Plants at P-deficient sites exhibited lower leaf water potential, stomatal conductance, and photosynthetic rates, with less conductive xylem compared to N-limited sites.
- Phosphorus (P) fertilization significantly improved these physiological and hydraulic traits in P-limited plants.
- Nitrogen (N) fertilization had minimal impact on photosynthetic or hydraulic traits in N-limited plants.
Conclusions:
- Nutrient limitation (N vs. P) differentially impacts the hydraulic pathways and physiological functions of mangroves.
- Plants under P limitation experience water deficiency and show more significant structural and functional improvements upon nutrient relief than those under N limitation.
Related Concept Videos
02:40Epiphytes, Parasites, and Carnivores
Plants often form mutualistic relationships with soil-dwelling fungi or bacteria to enhance their roots’ nutrient uptake ability. Root-colonizing fungi (e.g., mycorrhizae) increase a plant’s root surface area, which promotes nutrient absorption. While root-colonizing, nitrogen-fixing bacteria (e.g., rhizobia) convert atmospheric nitrogen (N2) into ammonia (NH3), making nitrogen available to plants for various biological functions. For example, nitrogen is essential for the biosynthesis of the...
02:11The Roles of Bacteria and Fungi in Plant Nutrition
Plants have the impressive ability to create their own food through photosynthesis. However, plants often require assistance from organisms in the soil to acquire the nutrients they need to function correctly. Both bacteria and fungi have evolved symbiotic relationships with plants that help the species to thrive in a wide variety of environments.
02:35Key Elements for Plant Nutrition
Like all living organisms, plants require organic and inorganic nutrients to survive, reproduce, grow and maintain homeostasis. To identify nutrients that are essential for plant functioning, researchers have leveraged a technique called hydroponics. In hydroponic culture systems, plants are grown—without soil—in water-based solutions containing nutrients. At least 17 nutrients have been identified as essential elements required by plants. Plants acquire these elements from the atmosphere, the...
01:06Primary Production
The total amount of energy acquired by primary producers in an ecosystem is called gross primary production (GPP). However, of this energy, producers use some for metabolic processes, and some is lost as heat, decreasing the amount of energy available to the next trophic level. The remaining usable amount of energy is called the net primary productivity (NPP). In terrestrial ecosystems, NPP is driven by climate, while light penetration and nutrient availability drive NPP in aquatic ecosystems.
01:30Marine Microbial Ecology
Marine microbial ecosystems are shaped by distinct physicochemical limits, including high salinity, low nutrient availability, and fluctuating oxygen levels. These conditions favor smaller microbial cell sizes, which maximize their surface-to-volume ratio for efficient nutrient uptake.Microbial activity and community composition are closely linked to biogeochemical cycles, particularly in dynamic environments like estuaries, where halotolerant microbes thrive in response to variable salinity...
02:41Responses to Drought and Flooding
Water plays a significant role in the life cycle of plants. However, insufficient or excess of water can be detrimental and pose a serious threat to plants.