1 Introduction
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Therefore, renewable energy is completely different. Fossil fuels do not produce as
many greenhouse gases and other pollutants as fossil fuels burn [24]. Renewable
energy such as wind, solar, geothermal, hydrogen and biomass plays an important
role.
There are plants in all parts of the world, and there are unique oil plants in different regions. Their growth is different. These oil plants, such as Swida wilsoniana
(Wanger.), Xanthoceras sorbifolium Bunge, Pistacia chinensis Bunge, Jatropha curcas, leprosy, are mainly distributed in China. Most oil plants are barren, droughttolerant and saline-alkali tolerant, which can be used not only as oil output, but also as
soil and water conservation projects, especially in the transformation of mountains,
and the greening benefit is more obvious. Biofuels are in the process of acquiring
worship status. It does not provide an opportunity to address energy security and
climate change. It is simple to use, biodegradable, nontoxic and basically does not
contain sulfur and aromatic compounds. Biofuels such as bioethanol themselves or
as mixtures can help reduce oil imports and carbon emissions. There is need to
develop the right biofuel model based on raw materials and technology, and develop
a long-term action plan to ensure availability. Efforts to determine the correct variety
of raw materials and the establishment of R&D and production facilities throughout
the country are not reliable. Shrubs and trees that can survive in difficult climatic
and soil conditions are often considered to be a good source of biodiesel in crop
selection.
Swida wilsoniana (Wanger.) Sojak
Swida wilsoniana (Wanger.) Sojak, a perennial deciduous tree of Cornus officinalis,
is an ideal wild woody oil tree species, which mainly grows in central and southern
China. It is resistant to barren land and drought, and is suitable for limestone mountain
growth. The oil content of the fruit is 33% ≤ 36%, and the average oil production per
plant is more than 15 kg. The refined oil of Swida wilsoniana (Wanger.) Sojak contains
77.68% unsaturated fatty acids, including 38.3% oleic acid and 38.85% linoleic acid.
The refined oil was identified as the first-grade edible oil by the Ministry of National
Food. The oil refining of Swida wilsoniana (Wanger.) Sojak is a kind of biodiesel
prepared by transesterification. Its physicochemical properties are similar to those
of 0# diesel oil, good exercise, stable operation, safety and cleanliness, an ideal
alternative to 0 # diesel [17 # 19]. The ecological environment of Swida wilsoniana
(Wanger.) Sojak is perennial deciduous shrubs or trees of Cornus officinalis. The
trees are tall and grow rapidly. They are widely distributed in the south of the Yellow
River in China, and are mainly concentrated in the central and southwest regions
of the Yangtze River Basin. Especially in Hunan, Jiangxi, Hubei, Sichuan and other
provinces, Hunan, Jiangxi, Hubei, Sichuan and other provinces have the most, wide
environmental adaptability, resistance to diseases and insect pests, early flowering
and fruiting, fast wood production, high fruit yield, and a long income period. The
results showed that the growth, development and fruiting of the light bark tree in the
edge of the forest were significantly better than those in the open area. The growth
and development of forest edge wood is significantly better than that of forest edge
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