What does melon soil mean?Melon pulp referred to the flesh of melons. For example, the edible part of watermelons, cantaloupes, zucchini, and other melons was the flesh.
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What does the biological structure of soil mean?The characteristics of soil biological structure involved many aspects. First of all, the proportion of producers in the soil ecosystem was small. Algal was one of the few organisms that could photosynthesize, and most of the organic matter came from the remains of plants on the ground. The soil creatures were mutated in time and space and had a hierarchical structure.
From the perspective of horizontal structure, its complexity was caused by three reasons: first, the distribution habits of parent plants, such as the different ability of wind, animal and water to spread, the weight of seeds and the way of reproduction affected the distribution of plants; The third was the interaction between species. For example, herbivores relied on the distribution of plants for food, but they were also affected by competition, mutualism, and partial symbiosis.
In the aspect of latitude, from the tropics to the poles, the species richness and species richness of the biological community gradually decreased with the increase of latitude. In the aspect of altitude, the species richness of the community decreased with the increase of altitude. In the aspect of environmental grads, the species richness of the community and the environmental grads were sometimes obvious. For example, the levels of P, Mn and K in the soil were significantly related to the species richness of the tropical plant community. In the early stage of community succession, the species richness increased with the succession progress, but in the later stage, the species richness would decrease when the dominant species appeared.
The microorganisms in the soil were also an important part of the soil biological structure. Different planting methods (such as crop multiplication, crop rotation, interplanting systems, etc.) would affect the status of soil microorganisms, which in turn affected soil health. Moreover, the biological structure of the soil and the non-biological characteristics of the soil (such as soil nutrients, soil structure, etc.) jointly affected the ecological function of the soil. They interacted with each other, and there was a regular replacement in the three-dimensional spatial pattern and continuity in time sequence.
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What does it mean to be ten thousand feet yellow soil?The " Ren " in the " Ten Thousand Ren Yellow Soil " was a unit of length in ancient times. Ten Thousand Ren was extremely high. The " Ten Thousand Feet Yellow Soil " depicted the deep, vast, and massive layers of yellow soil on the Yellow Plateau. It expressed the magnificence of the yellow soil in terms of quantity and scale. At the same time, it also hinted at the heavy feeling contained in the unique landscape of the Yellow Plateau, whether it was in the geographical sense or in the historical and cultural implications it carried.
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What does the relationship between soil microorganisms and carbon neutrality mean?There were many relationships between soil microorganisms and carbon neutrality. On the one hand, according to the " enzyme lock theory," soil microorganisms could be used as carbon " collectors " to help reduce greenhouse gases in the atmosphere, thus having positive significance for carbon neutrality. However, the experimental results published in Nature Communication in July 2021 showed that soil microorganisms also "eat" vitamins, which may release carbon dioxide, which contradicted the " In addition, there were many types and large numbers of soil microorganisms. They carried out processes such as oxidization, nitration, finement, nitrogen fixing, sulfur fixing, etc. in the soil, which could promote the decomposition of soil organic matter and the transformation of nutrients. This series of processes may also indirectly affect the fixing and release of carbon in the soil, which in turn was related to carbon neutrality.
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blanched soilThe bleached-layer soil is a layer of soil formed by the loss of clay particles and/or free iron dioxide, sometimes accompanied by the in-place condensation of iron dioxide. Its color was mainly determined by the sand particles and powder particles that formed the whiteness. The bleached layer was usually composed of bleached substances, including segregated iron-Mn agglomerations, agglomerations, and patches. The whiteness itself showed the characteristics of the color, such as a tint lower than 2, a moistened lightness greater than 3, a dry lightness greater than 6, and so on. The thickness of the blanched layer was generally between 20-30cm. Its distribution and formation in the soil are related to the clay content, iron dioxide content, water eluviation and drainage of the soil. There was a specific level of diagnosis for the bleached layer in the soil systematic classification. For example, there was a classification for the bleached layer in both the Chinese soil systematic classification and the American soil systematic classification. However, there were still some disputes and differing views on the cause and nature of the bleachers.