READING AND INTERPRETING SYSTEMS DIAGRAMS This diagram illustrates

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READING AND INTERPRETING SYSTEMS DIAGRAMS

READING AND INTERPRETING SYSTEMS DIAGRAMS

This diagram illustrates relationships between factors that influence erosion in agricultural systems Runoff +

This diagram illustrates relationships between factors that influence erosion in agricultural systems Runoff + + Precipitatio n + - Erosion Crop Yield Modified from: Pruski, F. F. , and M. A. Nearing, 2002, Climate-induced changes in erosion during the 21 st century for eight U. S. locations, Water Resour. Res. , 38(12), 1298, doi: 10. 1029/2001 WR 000493.

The direction of the arrows indicates cause and effect relationships Runoff Precipitatio n Erosion

The direction of the arrows indicates cause and effect relationships Runoff Precipitatio n Erosion Crop Yield (diagram modified from Pruski and Nearing, 2002)

For example, this arrow tells us that changes in precipitation cause changes in runoff

For example, this arrow tells us that changes in precipitation cause changes in runoff Runoff Precipitatio n (diagram modified from Pruski and Nearing, 2002)

If it were pointing the other way, that would mean that changes in runoff

If it were pointing the other way, that would mean that changes in runoff cause changes in precipitation. This doesn’t make much sense! Runoff X Precipitatio n (diagram modified from Pruski and Nearing, 2002)

But, the direction of the arrows doesn’t tell us how a factor impacts other

But, the direction of the arrows doesn’t tell us how a factor impacts other factors. Runoff Precipitatio n Erosion Crop Yield (diagram modified from Pruski and Nearing, 2002)

The + and – signs indicate what type of relationship exists between the factors.

The + and – signs indicate what type of relationship exists between the factors. + = positive relationship - = negative relationship Runoff + + Precipitatio n + - Erosion Crop Yield (diagram modified from Pruski and Nearing, 2002)

A positive relationship means that a change in one factor causes an effect on

A positive relationship means that a change in one factor causes an effect on another factor in the same direction. Runoff + Precipitatio n + + Erosion Crop Yield (diagram modified from Pruski and Nearing, 2002)

For example, this arrow indicates that… an increase in precipitation causes an increase in

For example, this arrow indicates that… an increase in precipitation causes an increase in runoff AND a decrease in precipitation causes a decrease in runoff Runoff + Precipitatio n (diagram modified from Pruski and Nearing, 2002)

A negative relationship means that a change in one factor causes an effect on

A negative relationship means that a change in one factor causes an effect on another factor in the opposite direction. Runoff - Erosion Crop Yield (diagram modified from Pruski and Nearing, 2002)

For example, this arrow indicates that… an increase in crop yield causes a decrease

For example, this arrow indicates that… an increase in crop yield causes a decrease in erosion AND a decrease in crop yield causes an increase in erosion Erosion Crop Yield (diagram modified from Pruski and Nearing, 2002)

So, we can use this diagram to describe relationships between factors that influence erosion

So, we can use this diagram to describe relationships between factors that influence erosion in agricultural systems and predict how changes in one factor will influence other factors. Runoff + + Precipitatio n + - Erosion Crop Yield (diagram modified from Pruski and Nearing, 2002)

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