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9.4 Physical and chemical processes



To score physical and chemical processes, experts will follow these steps:

  1. Estimate a consensus score for the condition of physical and chemical processes in the Best 10% and Worst 10% of the habitat (eg. relative to 1900).  Score both the area and condition of physical and chemical processes; for example if it is estimated that human activities have caused the physical and chemical process to no longer occur in 10% of the places where it did occur relative to the benchmark date, then the Worst 10% of that physical and chemical process will have a score of 1.

  2. Estimate a consensus score for the condition of the physical and chemical process in Most areas (eg. relative to 1900).

  3. Assign a Confidence grade for the Condition estimates (High, Medium, Low).

  4. Estimate the trends for each of Best 10%, Worst 10%, Most (Improving, Declining, Stable) over the last 5 years.

  5. Assign a Confidence grade for the Trend estimates (High, Medium, Low).

  6. Identify the main anchor references, and any commentary/notes in any relevant column for the habitat.

 

 

Physical and Chemical Processes

Grading statements for the main physical processes as modified by human activities

Very Good (7-8)

There are no significant changes in physical or chemical processes or ecosystem services as a result of human activities

Good (5-6)

There are some significant changes in physical or chemical processes as a result of human activities in some areas, but these are not to the extent that they are significantly affecting ecosystem functions

Poor (3-4)

There are substantial changes in physical or chemical processes as a result of human activities, and these are significantly affecting ecosystem functions in some areas

Very Poor (1-2)

There are substantial changes in physical or chemical processes across a wide area of the region as a result of human activities, and ecosystem function is seriously affected in much of the region