What is Soil Organic Matter (SOM)?
The soil fraction containing non-carbonate C; consists of living organisms, decomposed residues, and humus.
What are the categories of SOM?
What constitutes living soil biota?
All soil organisms, including bacteria, fungi, and protozoa.
What is the active pool of SOM?
Fresh and partially decomposed plant and animal litter, which is a source of energy for microbes.
What is humus?
Stable, well-decomposed organic matter with a slow turnover rate, enhancing soil structure.
What is the role of SOM in soil fertility?
It is a key reservoir of plant nutrients and acts as a natural slow-release fertilizer.
How does SOM influence soil structure?
It glues soil particles together, forming stable aggregates that improve aeration and drainage.
What nutrients are primarily held in SOM?
What is mineralisation in the context of SOM?
The process where soil microorganisms decompose organic matter to release nutrients in inorganic forms.
What are the physical roles of SOM?
It stabilizes soil structure, improves aeration, and enhances water holding capacity.
How does SOM affect cation retention?
It binds positively charged ions, preventing their leaching from the root zone.
What negative impact can SOM have?
It can immobilise toxic elements like Cd and Pb, reducing plant uptake.
What does SOM stand for in soil science?
Soil Organic Matter
What is the role of SOM in the soil food web?
Foundation and primary source of C and energy for soil organisms
Which organisms are the primary decomposers in soil?
What is the primary source of energy for soil organisms?
Soil Organic Matter (SOM)
What do microbes do to complex organic matter?
They break it down to fuel their metabolic processes.
What larger organisms consume protozoa and nematodes?
What does SOM stand for?
Soil Organic Matter
What is a major role of a healthy soil biological community?
Performing essential ecosystem services.
How much carbon do soils hold compared to the atmosphere?
Approximately twice as much.
What two processes determine atmospheric CO2 levels?
What can accelerate SOM decomposition?
Conventional agricultural practices like intensive tillage.
What is a nature-based solution to mitigate climate change?
Adopting practices that build SOM.
What factor influences SOM levels related to climate?
Temperature and moisture control decomposition rates.
How do rainforests compare to deserts in C return?
Rainforest: 11 tonnes C/ha/year; Desert: 0.05 tonnes C/ha/year.
What type of soil stores more SOM?
Fine-textured soils with high clay content.
What landscape position tends to accumulate organic matter?
Low-lying depressions due to higher moisture levels.
What happens to SOM over hundreds or thousands of years?
It accumulates until reaching a steady state.
What human activities most affect SOM?
What is Soil Organic Matter (SOM)?
The soil fraction containing non-carbonate C; consists of living organisms, decomposed residues, and humus.
What are the categories of SOM?
What is the active pool of SOM?
Fresh and partially decomposed plant and animal litter, which is a source of energy for microbes.
What is humus?
Stable, well-decomposed organic matter with a slow turnover rate, enhancing soil structure.
What is the role of SOM in soil fertility?
It is a key reservoir of plant nutrients and acts as a natural slow-release fertilizer.
How does SOM influence soil structure?
It glues soil particles together, forming stable aggregates that improve aeration and drainage.
What is mineralisation in the context of SOM?
The process where soil microorganisms decompose organic matter to release nutrients in inorganic forms.
What are the physical roles of SOM?
It stabilizes soil structure, improves aeration, and enhances water holding capacity.
How does SOM affect cation retention?
It binds positively charged ions, preventing their leaching from the root zone.
What negative impact can SOM have?
It can immobilise toxic elements like Cd and Pb, reducing plant uptake.
What is the role of SOM in the soil food web?
Foundation and primary source of C and energy for soil organisms
What do microbes do to complex organic matter?
They break it down to fuel their metabolic processes.
What is a major role of a healthy soil biological community?
Performing essential ecosystem services.
What factor influences SOM levels related to climate?
Temperature and moisture control decomposition rates.
How do rainforests compare to deserts in C return?
Rainforest: 11 tonnes C/ha/year; Desert: 0.05 tonnes C/ha/year.
What landscape position tends to accumulate organic matter?
Low-lying depressions due to higher moisture levels.
What happens to SOM over hundreds or thousands of years?
It accumulates until reaching a steady state.
你确定要删除 0 张抽认卡？此操作无法撤销。
选择要移除的标签，从 0 所选卡片中：
正在加载标签...