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Updated: Sep 9, 2025

Measuring Phosphorus Release in Laboratory Microcosms for Water Quality Assessment
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Quercus acutissimaの純森林と混合森林の土壌積層のリン分数の特性と影響因子

Da-Yuan Liu1,2, Dong-Yue Meng1,2, Chen-Yi Yu1,2

  • 1Co-Innovation Centre for Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing 210037, China.

Ying yong sheng tai xue bao = The journal of applied ecology
|August 31, 2025
PubMed
まとめ

混合森林は,土壌の固体安定性と酸性ファスファターゼの活性性を高めることで,純粋な森林と比較して土壌のリン含有量を大幅に高めます. この研究は 亜熱帯の土壌における 栄養素の循環を改善するための 鍵となるものです

キーワード:
細い根のバイオマス雑草のバイオマス土壌集積物土壌のリン分数スタンド型

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Unlike carbon, water, and nitrogen, phosphorus is not present in the atmosphere as a gas. Instead, most phosphorus in the ecosystem exists as compounds, such as phosphate ions (PO43-), found in soil, water, sediment and rocks. Phosphorus is often a limiting nutrient (i.e., in short supply). Consequently, phosphorus is added to most agricultural fertilizers, which can cause environmental problems related to runoff in aquatic ecosystems.
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Aggregates contain pores of varying sizes; while some are completely enclosed within the particles, others open onto the surface, allowing water to penetrate. The porosity of aggregates is a major factor contributing to the overall porosity of concrete, given that aggregates constitute about three-quarters of concrete's volume.
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Aggregate classification is generally based on its size, petrographic characteristics, weight, and source. Size classification ranges from coarse to fine aggregates, defined by the size of the particles. Coarse aggregates are particles that do not pass through ASTM sieve No. 4, and aggregates that pass through the sieve are fine aggregates.
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Unsoundness in aggregates due to volume changes is primarily caused by the physical alterations aggregates undergo, such as freezing and thawing, thermal changes, and wetting and drying. Unsound aggregates, when subjected to these changes, result in volume change upon disintegration. This, in turn, contributes to the deterioration of concrete, including scaling, pop-outs, and cracking. Particular types of aggregates, such as porous flints, cherts, and those containing clay minerals, are...
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Deleterious Substances in Aggregate

Deleterious substances in aggregates can be detrimental to the quality and durability of concrete. These substances include organic impurities like loam, which interfere with cement hydration and are usually present in the sand. These prevent a good bond between aggregate and cement paste. Organic impurities can be detected using the colorimetric test, where the darkness of a solution after agitation indicates the level of organic content.
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