scholarly journals Improving Ecological Functions and Ornamental Values of Traditional Pear Orchard by Co-Planting of Green Manures of Astragalus sinicus L. and Lathyrus cicera L.

2021 ◽  
Vol 13 (23) ◽  
pp. 13092
Author(s):  
Qin Zhang ◽  
Yutao Peng ◽  
Jingxin Wang ◽  
Longcheng Li ◽  
Danjun Yao ◽  
...  
Keyword(s):  
Carbon Fixation ◽  
Total Carbon ◽  
High Yield ◽  
Oxygen Production ◽  
Large Area ◽  
Ecological Functions ◽  
Astragalus Sinicus ◽  
Pear Orchard ◽  
Lathyrus Cicera ◽  
Single Flower

Traditional orchards received little attention in ecology. In order to enhance the ecological function of traditional pear orchard, it is an effective strategy to co-plant the ornamental green manure (GM) under the pear forest. In this study, two kinds of GM, i.e., Astragalus sinicus L. (AS) and Lathyrus cicera L. (LC), were co-planted in pear tree orchard to elevate its landscape benefits of spatiotemporal distribution of flowers, the nutrient benefits and oxygen production. The results showed that the flower height of AS and LC arrange between 20~30 cm, and the flowering period covers the March. LC has a large number of flowers, a small area of single flower, and high yield of fresh grass. AS has a small number of flowers, a large area of single flower, and low yield of a single fresh grass. Among them, 35% AS + 65% LC and 50% AS + 50% LC are more suitable in achieving the well tourism value and potential good production of pear orchard. Nutrient accumulation, total carbon fixation and oxygen production, flower number of 35% AS + 65% LC are larger than other treatments, while the flower period of 50% AS + 50% LC is longest. This study proposed a “win-win” GM planting strategy for sustainable orchard development, by enhancing ecology functions and the landscaped value of the traditional fruit orchard.

Analysis of the Response of Hypolimnetic Phytoplankton in Continuous Culture to Increased Light or Phosphorus Using Track Autoradiography

1980 ◽  
Vol 37 (3) ◽  
pp. 434-441 ◽  
Author(s):  
R. Knoechel ◽  
F. deNoyelles Jr.
Keyword(s):  
Continuous Culture ◽  
Carbon Fixation ◽  
Common Species ◽  
Total Carbon ◽  
Experimental Lakes Area ◽  
Phosphorus Enrichment ◽  
Species Response ◽  
Ankistrodesmus Falcatus ◽  
Wide Range ◽  
Track Autoradiography

Phytoplankton from the hypolimnetic biomass peak in Lake 266SW (Experimental Lakes Area, northwestern Ontario) was subjected to conditions of increased light or phosphorus in continuous culture. Phosphorus enrichment increased total carbon fixation 16% relative to the control; however, the particulate fraction was initially depressed and the phytoplankton biomass was less than 2% greater after 10 d. The high light culture displayed 21% higher final biomass despite a 13% decline in total carbon fixation which was primarily due to reduced extracellular release. The 21 most common species demonstrated a wide range of positive and negative biomass responses to the experimental perturbations; however, the three dominant chrysophyte species all responded positively to higher light. Detection of population biomass changes provided a direct and accurate means of quantifying perturbation effects provided the species response was stable over several days. Measurement of carbon uptake rates of species through track autoradiography provided the additional sensitivity and temporal resolution needed to monitor low level or variable responses. Synedra radians exhibited a lengthy lag period before demonstrating a strong positive response to phosphorus enrichment, while Dinobryon sertularia shifted from neutral to strongly negative and then strongly positive within a 3-d period. These results illustrate the inadequacy of short-term bioassays for the prediction of long-term perturbation effects.Key words: growth rate, primary production, Ankistrodesmus falcatus, Dinobryon sertularia, Synedra radians

Protein Synthesis by Lake Plankton Measured Using in situ Carbon Dioxide and Sulfate Assimilation

1987 ◽  
Vol 44 (12) ◽  
pp. 2102-2117 ◽  
Author(s):  
Russell L. Cuhel ◽  
David R. S. Lean
Keyword(s):  
Carbon Dioxide ◽  
Protein Synthesis ◽  
Carbon Fixation ◽  
Total Carbon ◽  
Light Limitation ◽  
Sulfate Assimilation ◽  
Sulfate Uptake ◽  
Chl A ◽  
Total Sulfate

Sequential 4- to 6-h in situ measurements of carbon dioxide and sulfate uptake showed midday deepening of the depth of Pmax and photoinhibition of upper water column samples. Analysis of subcellular fractions accentuated total uptake measurements, with net protein synthesis providing a direct measure of growth. The percentage of carbon assimilated into protein was smallest at the depth of maximum photosynthesis and increased with light limitation. Summed incubations agreed well with all-day deployments for total carbon fixation and protein synthesis. Assimilation numbers were consistently low (<2.5 g C∙g Chl a−1∙h-1 with integrated (0–20 m) areal production of 616–1467 mg C∙m−2 and 7.5–32.4 mg S∙m−2 during the light day. Nonreductive sulfate assimilation (predominantly ester-SO4−) accounted for up to 40% of the total sulfate uptake when diatoms predominated. Protein synthesis measured with 35S (200–1000 mg protein∙m−2 during the light day) increased 57–89% overnight. Hourly rates were similar during light and scotophase incubations. Night metabolism substantially altered the biochemical composition (e.g. protein, lipid, and carbohydrate) of the plankton with respect to newly incorporated carbon. Combined plant-specific H14CO3− and general microbial 3SSO42− techniques suggested algal dominance in the mixed layer.

scholarly journals The effect of crop coverage on the daily dynamism of the soil’s CO2 emission

2010 ◽  
pp. 97-102
Author(s):  
Nikolett Szőllősi ◽  
Csaba Juhász ◽  
Györgyi Kovács ◽  
József Zsembeli
Keyword(s):  
Greenhouse Gases ◽  
Co2 Emission ◽  
Soil Surface ◽  
Bare Soil ◽  
Organic Content ◽  
Total Carbon ◽  
Large Area ◽  
Total Carbon Content ◽  
Ecosystem Research ◽  
Global Carbon

Nowadays one of main goals of international ecosystem research the measurement of greenhouse gases (CO2, N2O and CH4) in different places. The fluctuation of these greenhouse gases – quantity and trend in the case of CO2 and CH4 – could be diverse with atmosphere because it depends on several effects of factors like climate, soil type, vegetation. In grassland out of the three greenhouse gases which fill a part in gas emission, in the case of CO2 soil and vegetation are the most important factors (Soussana et al., 2007).In the aspect of global carbon balance grasslands are very important by their large area extension, total carbon content, organic content store (10% of the global carbon storage) (Lemmens et al., 2006). In this summer measurements were carried out to determine CO2 emission of the soil from different soil surfaces like grass covered and bare soil surface during a whole day.

scholarly journals Nature-oriented potential resource and melliferous value of forest belts in steppe agro-forest landscapes

2018 ◽  
Vol 60 (2) ◽  
pp. 99-107 ◽  
Author(s):  
Irina Samsonova ◽  
Anatoly Gryazkin ◽  
Natalia Belyaeva ◽  
Vladimir Belyaev ◽  
Vitaliy Petrik ◽  
...  
Keyword(s):  
Carbon Fixation ◽  
Black Locust ◽  
Robinia Pseudoacacia ◽  
Mixed Forest ◽  
Steppe Zone ◽  
Oxygen Production ◽  
Local Conditions ◽  
Climatic Regions ◽  
Forest Belts ◽  
Potential Resource

Abstract Creation of forest shelterbelts in steppe zone is important because they allow to obtain the highest yields of grains of cereals where the area of the most favorable conditions for growth is formed in comparison with many other soil-climatic regions. Melliferous and pollen production value of lands changes as a result of anthropic landscape conversion from agrarian to forest agrarian. There are a lot of melliferous trees and shrubs in forest belts; some of them have been introduced from the other floristic regions and are well naturalised in the local conditions. Nature-oriented potential resource of forest belts is in carbon deposition and oxygen production by phytomass of the main species. The aim of the research is to evaluate the bioresource potential of forest belts in the conditions of steppe agrarian landscapes. Bioresource potential (Brp) of forests for honey supply in the region was defined according to the distribution of species in the area. Potential honey stock of melliferous lands, represented by forest stands was assigned according to their area, given by the Forestry Department of Rostov region, and the average normative honey productivity of 1 ha of these crops. The number of beehives (N) necessary for honey supply that use ½ of bioresource forest potential was calculated according to the need of a bee family in honey per year. Value of nature-oriented resource of black locust (Robinia pseudoacacia) stands was defined according to the amount of oxygen produced and carbon deposed. Pure and mixed forest belts with the share of black locust from 60 to 80% (335.0–494.5 kg/ha) in composition with ash (Fraxinus sp.), Norway maple, Siberian elm (Ulmus pumila), apricot and dense structure of honey suckle and Siberian pea tree underbrush have the highest productivity. The total volume of possible honey yield from forest belts of agro-forest landscapes in the studied region is 26,379.8 t. Maximum indices of carbon fixation and oxygen production are observed in the maturing stands of black locust, and the largest honey stock dominate in average age stands and are 3,755,000 t, 10,288,000 t and 25,200 t, respectively. The role of the whole system in the increase of landscape honey productivity and formation of forage conveyor for bees and enthomophages might be much more if the recommended assortment of the best melliferous and pollen bearing species would be more completely used when forest belts are created.

scholarly journals Fabrication of Size-Controlled Metallic Nanogaps down to the Sub 3-Nm Level

2020 ◽  
Author(s):  
Sihai Luo ◽  
Andrea Mancini ◽  
Rodrigo Berté ◽  
Bård H. Hoff ◽  
Stefan A. Maier ◽  
...  
Keyword(s):  
Self Assembly ◽  
Surface Enhanced Raman Spectroscopy ◽  
High Yield ◽  
Large Area ◽  
Practical Applications ◽  
Molecular Diodes ◽  
Surface Enhanced Raman ◽  
Visible Light Active ◽  
Patterning Technique ◽  
Optical Applications

Metallic nanogaps are fundamental components of nanoscale photonic and electronic devices. However, the lack of reproducible high-yield fabrication methods with nanometric control over the gap-size has hindered practical applications. Here, we report a patterning technique based on molecular self-assembly and physical peeling that allows the gap-width to be tuned over the range 3 – 30 nm and enables the fabrication of massively parallel nanogap arrays containing hundreds of millions of ring-shaped nanogaps (RSNs). The method is used here to prepare molecular diodes across sub-3-nm metallic nanogaps and to fabricate visible-light-active plasmonic substrates based on large-area, gold-based RSN arrays. The substrates are applicable to a broad range of optical applications, and are used here as substrates for surface-enhanced Raman spectroscopy (SERS), providing high enhancement factors of up to 3e8 relative to similar, gap-free thin gold films.

scholarly journals Environmental drivers of coccolithophore abundance and calcification across Drake Passage (Southern Ocean)

2016 ◽  
Author(s):  
Anastasia Charalampopoulou ◽  
Alex J. Poulton ◽  
Dorothee C. E. Bakker ◽  
Mike I. Lucas ◽  
Mark C. Stinchcombe ◽  
...  
Keyword(s):  
Southern Ocean ◽  
North Atlantic ◽  
Carbon Fixation ◽  
Rank Correlation ◽  
Drake Passage ◽  
Total Carbon ◽  
Environmental Drivers ◽  
Multivariate Statistical ◽  
The North ◽  
Spearman’S Rank Correlation

Abstract. Although coccolithophores are not as common in the Southern Ocean as they are in sub-polar waters of the North Atlantic, a few species, such as Emiliania huxleyi, are found during the summer months. Little is actually known about the calcite production (CP) of these communities, or how their distribution and physiology relates to environmental variables in this region. In February 2009, we made observations across Drake Passage (between South America and the Antarctic Peninsula) of coccolithophore distribution, CP, primary production, chlorophyll-a and macronutrient concentrations, irradiance and carbonate chemistry. Although CP represented less than 1 % of total carbon fixation, coccolithophores were widespread across Drake Passage. The B/C morphotype of E. huxleyi was the dominant coccolithophore, with low estimates of coccolith calcite (~ 0.01 pmol C coccolith−1) from biometric measurements. Both cell-normalised calcification (0.01–0.16 pmol C cell−1 d−1) and total CP (< 20 μmol C m−3 d−1) were much lower than those observed in the sub-polar North Atlantic where E. huxleyi morphotype A is dominant. However, estimates of coccolith production rates were similar (0.1–1.2 coccoliths cell−1 h−1) to previous measurements made in the sub-polar North Atlantic. A multivariate statistical approach found that temperature and irradiance together were best able to explain the observed variation in species distribution and abundance (Spearman's rank correlation ρ = 0.4, p < 0.01). Rates of calcification per cell and coccolith production, as well as community CP and E. huxleyi abundance, were all positively correlated (p < 0.05) to the strong latitudinal gradient in temperature, irradiance and calcite saturation states across Drake Passage. Broadly, our results lend support to recent suggestions that coccolithophores, especially E. huxleyi, are advancing pole-wards. However, our in situ observations indicate that this may owe more to sea-surface warming and increasing irradiance rather than increasing CO2 concentrations.

scholarly journals Carbon stock estimation and mapping of mangrove forest using ALOS-2 PALSAR-2 in Benoa Bay Bali, Indonesia

2021 ◽  
Vol 944 (1) ◽  
pp. 012044
Author(s):  
I G A I Mahasani ◽  
T Osawa ◽  
I W S Adnyana ◽  
A A M A P Suardana ◽  
Chonnaniyah
Keyword(s):  
Carbon Dioxide ◽  
Carbon Stock ◽  
Carbon Fixation ◽  
Remote Sensing Data ◽  
Primary Objective ◽  
Total Carbon ◽  
Total Biomass ◽  
Mangrove Forests ◽  
Ground Biomass ◽  
Carbon Dioxide Co2

Abstract Mangrove forests in tropics coastlines area play an essential role in carbon fixation and carbon storage. Mangrove forests in coastal areas are very effective and efficient in reducing the concentration of carbon dioxide (CO2) in the atmosphere because mangroves can absorb CO2 through photosynthesis by diffusion through stomata and then store carbon in the form of biomass. With the lack of efforts to manage mangrove forests, it needs to be developed so that forest functions can be utilized sustainably. This paper describes examining the use of remote sensing data, particularly dual-polarization ALOS-2 PALSAR-2 data, with the primary objective to estimate the carbon stock of mangrove forests in Benoa Bay, Bali. The carbon stock was estimated by analyzing HV Polarization, Above Ground Biomass (AGB), and ground biomass (BGB). The total carbon stock was obtained by multiplying the total biomass with the organic carbon value of 0.47. The potential carbon stock in the mangrove Benoa Bay area is 209,027.28 ton C to absorb carbon dioxide (CO2) of 767,130.11 ton CO2 Sequestration same with 3.87 X 1011 bottles in 2015 and 204.422,59 ton C to absorb carbon dioxide (CO2) of 750.230,93 ton CO2 Sequestration same with 3.79 x 1011 bottles in 2020.

scholarly journals Progressive Poling of Large Area, High r33 Electro-Optic Polymer SEO100c

2021 ◽  
Vol 11 (17) ◽  
pp. 8108
Author(s):  
Michael Maurer ◽  
Evan Gawron ◽  
Christopher Middlebrook
Keyword(s):  
Extended Period ◽  
High Yield ◽  
Large Area ◽  
Device Structure ◽  
Poling Process ◽  
Electro Optic ◽  
Waveguide Modulator ◽  
The Impact ◽  
Selection Of

SEO100c, an EO-polymer, has been reported of having an r33 in excess of 100 pm/V. Experimental poling research was performed on rib waveguide modulator for device design and development. Reported is the determination of the impact that temperature and voltage have on the poling of a SEO100c waveguide device in order to maximize the r33 while avoiding damage to the device structure ensuring high yield in manufacture. The poling process is shown to have a nonlinear relationship between r33 and poling field aiding in the selection of achievable poling voltages for required r33 values. Device thermal stability is quantified and reported for the complete poling process and the impacts upon r33. Investigation into the possible relaxation of device r33 is measured over an extended period demonstrating desirable use within deployable devices.

scholarly journals Direct roll transfer printed silicon nanoribbon arrays based high-performance flexible electronics

2021 ◽  
Vol 5 (1) ◽  
Author(s):  
Ayoub Zumeit ◽  
Abhishek Singh Dahiya ◽  
Adamos Christou ◽  
Dhayalan Shakthivel ◽  
Ravinder Dahiya
Keyword(s):  
Flexible Electronics ◽  
High Performance ◽  
Printed Electronics ◽  
Field Effect Transistors ◽  
High Mobility ◽  
Single Step ◽  
High Yield ◽  
Transfer Printing ◽  
Large Area ◽  
Direct Printing

AbstractTransfer printing of high mobility inorganic nanostructures, using an elastomeric transfer stamp, is a potential route for high-performance printed electronics. Using this method to transfer nanostructures with high yield, uniformity and excellent registration over large area remain a challenge. Herein, we present the ‘direct roll transfer’ as a single-step process, i.e., without using any elastomeric stamp, to print nanoribbons (NRs) on different substrates with excellent registration (retaining spacing, orientation, etc.) and transfer yield (∼95%). The silicon NR based field-effect transistors printed using direct roll transfer consistently show high performance i.e., high on-state current (Ion) >1 mA, high mobility (μeff) >600 cm2/Vs, high on/off ratio (Ion/off) of around 106, and low hysteresis (<0.4 V). The developed versatile and transformative method can also print nanostructures based on other materials such as GaAs and thus could pave the way for direct printing of high-performance electronics on large-area flexible substrates.

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