Identifying potential pathways for turtle-derived nutrients cycling through beach ecosystems

2017 ◽  
Vol 583 ◽  
pp. 49-62 ◽  
Author(s):  
DZM Le Gouvello ◽  
R Nel ◽  
LR Harris ◽  
K Bezuidenhout ◽  
S Woodborne
Keyword(s):  
Nutrients Cycling

scholarly journals Decomposition and nutrients cycling of residual biomass from integrated crop-livestock system

2019 ◽  
pp. 739-745
Author(s):  
Jeferson Tiago Piano ◽  
Jonas Francisco Egewarth ◽  
Jucenei Fernando Frandoloso ◽  
Eloisa Mattei ◽  
, Paulo Sérgio Rabello de Oliveira ◽  
...  
Keyword(s):  
Crop Residues ◽  
Nutrient Release ◽  
Climatic Conditions ◽  
Soybean Crop ◽  
Development Cycle ◽  
Crop Development ◽  
Tillage System ◽  
Nutrients Cycling ◽  
Crop Cycle ◽  
Initial Content

The objective was to evaluate the decomposition and nutrient release of biomass from maintenance of fallow or oat crop (IPR 126), managed in integrated crop-livestock, during the soybean crop cycle (85 days) in no tillage system in two years (2014 and 2015). The design was a randomized complete block in a subdivided plot scheme, with the parcel consisting of four plots (four straws, from fallow or oat cultivation) and the subplots (evaluation periods 0, 10, 35, 60 and 85 DAS) with the evaluation times throughout the crop cultivation soybean. The amount of biomass and the content of C, N, P, K, Ca, Mg and Zn were calculated. The amount of biomass and nutrients presents a similar pattern of decrease in their values; however, the climatic conditions and the C/N ratio play an important role in the decomposition and mineralization of nutrients. The mineralized amount of N, K, P, Ca, Mg and Zn is directly proportional to their initial content in the biomass, and K nutrient is quickly released from crop residues. Most of the nutrients studied were released during the soybean crop development cycle, favoring its development; this can provide a reduction of external inputs in the property.

scholarly journals Ecological intensification in multi-trophic aquaculture ponds: an experimental approach

2018 ◽  
Vol 31 ◽  
pp. 36 ◽  
Author(s):  
Christophe Jaeger ◽  
Joël Aubin
Keyword(s):  
Ecosystem Services ◽  
Rutilus Rutilus ◽  
Fish Growth ◽  
Fish Biomass ◽  
Nitrogen And Phosphorus ◽  
Nutrient Contents ◽  
Pond System ◽  
Growth Performances ◽  
Nutrients Cycling ◽  
Formulated Feed

As aquaculture production is increasing considerably, it needs to become more environment-friendly. Based on a participatory process, an ecologically intensive pond system was designed to test three hypotheses: a combination of intensive and extensive areas provides more ecosystem services than an intensive or extensive area alone; coupling a planted lagoon with an intensive pond decreases the latter's environmental impacts and maintains or increases its fish productivity; and using formulated feed in polyculture increases growth of all fish species. To test these hypotheses, we designed a specific integrated multi-trophic aquaculture system composed of a polyculture of common carp (Cyprinus carpio), roach (Rutilus rutilus) and tench (Tinca tinca) and a lagoon planted with macrophytes to filter the water. This pond system was compared with “extensive” (unfed) and “semi-intensive” fishpond systems without a planted lagoon. We measured fish growth performances, water quality, chlorophyll concentrations and water and sediment nutrient contents. We also calculated the mass balance of nutrients. Concentrations of total nitrogen and phosphorus increased in sediments, indicating that nutrients were stored in the ponds, especially in planted lagoon; the planted lagoon decreased phytoplankton development, and limited blooms, but it slightly decreased fish growth performances compared to those in semi-intensive fishponds. The formulated feed supplied clearly increased fish growth performances and the survival rate, and seemed also to increase the use of available nutrients in ponds, which improved the production of overall fish biomass. In conclusion, the planted lagoon provides ecosystem services on nutrients cycling and habitat for natural biodiversity. Improving knowledge about nutrient cycles from formulated feed within the pond food web would be useful to increase the amounts of nutrients converted into fish biomass.

scholarly journals Response of soil sulfur availability to elevation and degradation in the Wugong Mountain meadow, China

2017 ◽  
Vol 63 (No. 6) ◽  
pp. 250-256 ◽  
Author(s):  
Li Zhi ◽  
Zhang Ling ◽  
Chen Jing ◽  
Zhang Xueling ◽  
Yu Suqin ◽  
...  
Keyword(s):  
Nutrient Management ◽  
Soil Nutrient ◽  
Principal Component ◽  
Elevation Gradients ◽  
Nutrients Cycling ◽  
Phosphorus And Potassium ◽  
Major Nutrients ◽  
Nutrient Changes ◽  
Soil Sulfur ◽  
Nitrogen Phosphorus

Vegetation restorations of degraded meadows have been widely implemented. The evaluation of soil nutrient changes as affected by degradation is vital for efficient restorations. However, while macronutrients (nitrogen, phosphorus and potassium) have been widely investigated, sulfur (S) as one important element correlated tightly with other nutrients has not been thoroughly studied. Two studies were conducted to determine changes of sulfur as affected by degradation and elevation gradients. The results showed that available S (AS) changed non-linearly with elevation and the first principal component based on other soil nutrient variables. Soil AS depended on degradation levels and contributed substantially to the separation of meadows with different degradation levels. Moreover, AS responded stronger to changes in elevation gradients and degradation levels compared with other major nutrients. Thereby, AS could be an important nutrient responding to meadow disturbance, which should be considered in future studies on meadow soil nutrients cycling and vegetation restorations. The findings have implications for ecological restoration of degraded meadows with respect to soil nutrient management and conservations.

The effects of semi-lunar spring and neap tidal change on nutrients cycling in the intertidal sediments of the Yangtze estuary

2005 ◽  
Vol 48 (2) ◽  
pp. 255-264 ◽  
Author(s):  
L. J. Hou ◽  
M. Liu ◽  
S. Y. Xu ◽  
D. N. Ou ◽  
J. J. Lu ◽  
...  
Keyword(s):  
Yangtze Estuary ◽  
Intertidal Sediments ◽  
The Yangtze Estuary ◽  
Nutrients Cycling ◽  
Tidal Change

scholarly journals Physical and Biogeochemical Characterization of a Tropical Karstic Marsh in the Yucatan Peninsula, Mexico.

2021 ◽  
Author(s):  
Eduardo Cejudo ◽  
Daniela Ortega-Camacho ◽  
Eduardo Arturo García-Vargas ◽  
Elizabeth Hernández-Alarcón
Keyword(s):  
Ecosystem Services ◽  
High Water ◽  
Quintana Roo ◽  
Water Retention Capacity ◽  
Base Line ◽  
Retention Capacity ◽  
The North ◽  
Nutrients Cycling ◽  
Flood Regulation ◽  
Almost All

Abstract Karstic wetlands provide important ecosystem services such as maintenance of hydrological balance, flood regulation, drinking water supply and nutrients cycling. It is important to conserve and maintain karstic wetlands due to its interaction with groundwater systems and its socioeconomic relevance. The objective of this research was to generate base-line knowledge of the microtopography, hydroperiod and biogeochemical characteristics of poorly known tropical karstic marshes by testing two hypotheses, the phreatotrophic nature of tropical karstic marshes, and the alteration of its biogeochemistry by a highway dividing the marsh. The study site is located in the north of the state of Quintana Roo (Mexico), in pseudo-paludal depressions associated to fractures. The water level varied from few centimeters below the ground to more than 100 cm. We demonstrate that the wetland is groundwater-fed with differences among groundwater, interstitial and surface water in almost all parameters measured. The water is calcium bicarbonate type; the main processes occurring are recharge, evaporation and rock dissolution. Our results suggests active denitrification, low phosphates attributed to Ca- and Fe/Al-bound P, elevated alkalinity and sulfate reduction due to anaerobic conditions in water and soil. The soil reflect its sedimentary origin, the bulk density is low with very high water retention capacity. We do not have enough evidence of the highway modifying the biogeochemistry or hydrology of the marsh. These karstic wetlands provide important provisioning and supporting ecosystem services that should be studied, acknowledged and maintained.

scholarly journals LITTERFALL PRODUCTION AS A FUNCTION OF PLANTING SEEDLINGS SYSTEM IN A TWO YEARS FOREST RESTORATION AREA IN THE COASTAL - PLAIN OF CARAGUATATUBA, SÃO PAULO, BRAZIL

2018 ◽  
Vol 41 (3) ◽  
Author(s):  
Leda Lorenzo ◽  
Virgínia Hamer Campagnaro
Keyword(s):  
Coastal Plain ◽  
Rain Forest ◽  
Forest Restoration ◽  
Dry Mass ◽  
Litter Production ◽  
Pioneer Species ◽  
Litter Type ◽  
Ecological Processes ◽  
Litterfall Production ◽  
Nutrients Cycling

ABSTRACT Seedlings plantation combining pioneer and non-pioneer species facilitates the restoration of ecological processes, such as litterfall production. Litterfall is fundamental to reestablish nutrient cycling and to recover soil fertility in early stages of restoration. This study evaluated litterfall production in a two-year forest restoration area (transitional rain forest: Restinga high forest - submontane rain forest) by comparing differences in litter production between seedlings plantation in rows (LI, 2x2m spacing) and in clusters (NU, 30x30cm spacing). Litterfall was collected monthly during 24 months in 62 plots (27 LI; 27 NU and 8 controls without plantation). Litterfall dry mass, litter fractions (leaves, twigs, reproductive and miscellaneous), dry mass from seedling material and dry mass from vegetation prior to the restoration were determined. Annual litter production was higher in restored plots (254.91 g.m-2) than in control ones (120.99 g.m-2) and there was no difference between rows (259.39 g.m-2) and clusters (250.59 g.m-2). There was substitution of the litter type with time, which was higher in restored than in control plots, but there was no difference between rows and clusters. Results indicated that: (1) planting seedlings facilitates litterfall recovery; (2) there is litter substitution as from the beginning of the restoration; and (3) planting seedlings in rows or clusters is equally efficient to restore litter production. In conclusion, planting seedlings leads to higher litter production and it could benefit the recovery of nutrients cycling in degraded areas, regardless of the disposition of seedlings in rows or clusters.

scholarly journals Growth of Piper nigrum L. and nutrients cycling by intercropping with leguminous species

2017 ◽  
Vol 12 (1) ◽  
pp. 58-62
Author(s):  
Trevisan Evelyn ◽  
Luiz Partelli Fabio ◽  
Goes de Oliveira Marcos ◽  
Ribeiro Pires Fabio ◽  
Braun Heder
Keyword(s):  
Piper Nigrum ◽  
Leguminous Species ◽  
Nutrients Cycling

Plant litter crust drive nutrients cycling potentials by bacterial communities in sandy land ecosystem

2021 ◽  
Author(s):  
Xiaozhen Liu ◽  
Ze Huang ◽  
Caroline A. Havrilla ◽  
Yu Liu ◽  
Gao‐Lin Wu
Keyword(s):  
Bacterial Communities ◽  
Plant Litter ◽  
Sandy Land ◽  
Nutrients Cycling

scholarly journals Biostimulants as Plant Growth Stimulators in Modernized Agriculture and Environmental Sustainability

2021 ◽  
Author(s):  
Muhammad Amjad Bashir ◽  
Abdur Rehim ◽  
Qurat-Ul-Ain Raza ◽  
Hafiz Muhammad Ali Raza ◽  
Limei Zhai ◽  
...  
Keyword(s):  
Plant Growth ◽  
Greenhouse Gases ◽  
Growth Regulators ◽  
Environmental Sustainability ◽  
Crop Production ◽  
Soil Health ◽  
Nutrients Cycling ◽  
Research Gap ◽  
The Impact ◽  
Heavy Metals Bioavailability

Plant growth stimulators (growth regulators + biostimulants; PGS) are chemical substances (organic/inorganic), helpful in plant growth and development. These are not considered as the replacement of fertilizers but can help in improved crop and soil quality. Both compounds can amplify the root biomass, nutrients translocation, enzymatic activities, crop yield, physiology, and nutrient uptake. Biostimulants are rich in minerals, vitamins, plant hormones, oligosaccharides, and amino acids. These compounds have a serious role to improve soil health, fertility, sorption, and desorption of nutrients. Hence, have a vital character in nutrients cycling, abiotic stress control, heavy metals bioavailability, and greenhouse gaseous emission. This chapter focuses on the discussions about the influence of plant growth regulators and biostimulants in crop production, soil health, heavy metal cycling, greenhouse gases emission with environmental sustainability. Whereas, the impact of biostimulants on greenhouse gases is a research gap.

Nutrients cycling in Mediterranean basins: the role of the biological pump in the trophic regime

2001 ◽  
Vol 138 (1-3) ◽  
pp. 101-114 ◽  
Author(s):  
G. Crispi ◽  
R. Mosetti ◽  
C. Solidoro ◽  
A. Crise
Keyword(s):  
Biological Pump ◽  
Nutrients Cycling
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