Scenario farmland protection zoning based on production potential: A case study in China

2020 ◽  
Vol 95 ◽  
pp. 104581 ◽  
Author(s):  
Yilun Liu ◽  
Luo Liu ◽  
A-Xing Zhu ◽  
Chunhua Lao ◽  
Guohua Hu ◽  
...  
Keyword(s):  
Production Potential ◽  
Farmland Protection

scholarly journals Is nitrate a driver for pigments of phytoplankton (a case study from a small shallow European lake)?

2018 ◽  
Vol 54 ◽  
pp. 38
Author(s):  
Alexandra L. Rizhinashvili ◽  
Olga B. Maksimova
Keyword(s):  
Nitrogen Limitation ◽  
Nitrate Nitrogen ◽  
Close Correlation ◽  
Freshwater Ecosystems ◽  
Lake Ecosystem ◽  
Nitrate Anion ◽  
Production Potential ◽  
The Relationship ◽  
Drainage Ratio

The traditional view of biogenic limitation in freshwater ecosystems considers phosphorus as the primary limiting element, but this concept has recently been challenged. There are a number of studies that suggest that photosynthetic indices may depend on the levels of nitrogen (especially, nitrate-nitrogen). To test the hypothesis about the possibility of nitrogen limitation in the lake ecosystem, the present study analysed the water in the littoral zone of a shallow model lake for the relationship between the content of phytoplankton pigments (chlorophyll a and carotenoids) and nitrate. The nitrate-nitrogen was selected because it is the most chemically stable nitrogen species. The study was conducted in a small lake with a pronounced autochthonous regime (as indicated by its small drainage ratio) during a vegetation season with contrasting hydrological conditions. The relationship with the nitrate concentration was not confirmed for chlorophyll a, but the levels of nitrate anion and carotenoids were shown to be related. Chlorophyll a, which is regarded as a metabolically active component of phytoplankton cells, shows a close correlation with air temperature. The corresponding prognostic regression models were created. The data on nominal availability of nitrate-nitrogen for primary production show possible nitrogen limitation on some of the observation dates. If the production potential represented by certain levels of nitrate is not realised by phytoplankton, it can be used by filamentous algae. The results of the study provide first steps toward prediction of one of the indicators of phytoplankton growth, the content of two main types of pigment (chlorophyll a and carotenoids).

scholarly journals Production potential of biodiesel, methane and electricity in the largest steamed rice industry in Rio Grande do Sul, Brazil: case study

2021 ◽  
Vol 27 (2) ◽  
pp. 130-136
Author(s):  
Willian Nadaleti ◽  
Vitor Lourenço ◽  
Grzegorz Przybyła ◽  
Piotr Kardasz ◽  
Radosław Wróbel ◽  
...  
Keyword(s):  
Energy Production ◽  
Rice Bran Oil ◽  
Electric Energy ◽  
Rio Grande ◽  
Rio Grande Do Sul ◽  
Production Potential ◽  
Grain Processing ◽  
Self Sufficiency ◽  
General Studies

Abstract The potential for energy production from effluents and husks generated in grain processing in the rice parboiling industries in Brazil is capable of promoting energy self-sufficiency in the sector, through the production and use of syngas and biogas. However, the production of methane from residues of the rice parboiling industries is still little explored by academic studies, in general studies on the potential of methane production by this same type of effluent are found in the south of the country, however, the same is not true for the production of biodiesel from rice bran oil. The objective of this study was to determine the production potential of biodiesel, methane and electric energy of the largest parboiled rice industry in Rio Grande do Sul, located in the southern region of the country. According to this study, the rice parboiling industry located in Rio Grande do Sul, Brazil, has a production potential of 1.2∙102 m3/day of biodiesel, 2.93∙104 Nm3/day of methane and 1.89∙105 kWh/day of electricity. Despite being a significant and high potential, which may reduce the financial expenses of the industry regarding the purchase of energy from concessionaires, it is not able to promote its energy self-sufficiency. At the same time, it would be necessary to add the energy production potential of the rice husk gasification syngas highlighted in other studies

scholarly journals Impact of Farmland Change on Soybean Production Potential in Recent 40 Years: A Case Study in Western Jilin, China

2018 ◽  
Vol 15 (7) ◽  
pp. 1522 ◽  
Author(s):  
Luoman Pu ◽  
Shuwen Zhang ◽  
Fei Li ◽  
Ranghu Wang ◽  
Jiuchun Yang ◽  
...  
Keyword(s):  
Crop Production ◽  
Land Resources ◽  
Production Potential ◽  
Potential Models ◽  
Soybean Production ◽  
Eastern Area ◽  
Ecological Zones ◽  
The Impact ◽  
Western Jilin

During the last 40 years, the quantity and spatial patterns of farmland in Western Jilin have changed dramatically, which has had a great impact on soybean production potential. This study used one of the most advanced crop production potential models, the Global Agro-Ecological Zones model, to calculate the soybean production potential in Western Jilin based on meteorological, topography, soil and land use data, and analyzed the impact of farmland change on soybean production potential during 1975–2013. The main conclusions were the following: first, the total soybean production potential in Western Jilin in 2013 was 8.92 million tonnes, and the average soybean production potential was 1612 kg/ha. The production potential of eastern area was higher than the other areas of Western Jilin. Second, farmland change led to a growth of 3.30 million tonnes in soybean production potential between 1975 and 2000, and a decrease of 1.03 million tonnes between 2000 and 2013. Third, taking account of two situations of farmland change, the conversion between dryland and other categories, and the change of irrigation percentage led to the total soybean production potential in Western Jilin increased by 2.31 and only 0.28 million tonnes respectively between 1975 and 2000, and increased by 0.12 and 0.29 million tonnes respectively between 2000 and 2013. In general, the increase of soybean potential production was mainly due to grassland and woodland reclamation. The results of this study would be a good guideline for protecting safe baseline of farmland, managing land resources, and ensuring continuity and stability of soybean supply and food security.

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