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1 Objectives 1. Why quantitative data? 2. Relationship to attributes and indicators 3. Accuracy and precision of qualitative and quantitative indicators.

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Presentation on theme: "1 Objectives 1. Why quantitative data? 2. Relationship to attributes and indicators 3. Accuracy and precision of qualitative and quantitative indicators."— Presentation transcript:

1 1 Objectives 1. Why quantitative data? 2. Relationship to attributes and indicators 3. Accuracy and precision of qualitative and quantitative indicators 4. Selected measurements (overview)

2 2 u Quantitative measurements should be made: –where it is necessary to document assessments –for direct comparisons with other locations –where monitoring data are required to determine trend Why quantitative data? - page 12

3 3 Intended Applications – page 1 “This technique, in association with quantitative monitoring and inventory information, can be used to provide early warnings of resource problems on upland rangelands”. However, “this protocol is NOT to be used to … monitor land or determine trend”

4 4 Indicators and Attributes – page 12 “The best approach to designing a quantitative monitoring program that is compatible with this qualitative assessment protocol is to select the best quantitative indicators for each of the three attributes, rather than selecting an equivalent quantitative indicator for each qualitative indicator”.

5 5 u Quantitative are more precise Accuracy and Precision u Either qualitative OR quantitative can be more accurate

6 6  Watters, Weltz, and Smith (1996) –Standing biomass, basal cover, nearest pern. plant, and freq. with no rooted plant showed strong relationships to the subjective Site Stability Rating. uLane, Nichols, and Levick (1999) –Verified qualitative Soil and Site Stability indicators with quantitative data. –“range health assessment methodology is a significant advance over previous…procedures..” uLiebig & Doran (1999) –Farmers perceptions of soil quality were closely related to most lab results…useful screen for further evaluations. Qualitative Indicator Research

7 7

8 8 Compaction layer Soil surface NOT a compaction layer* Soil surface *Even though it has a high (quantitative) bulk density

9 9 uUSDA 1997 (NRCS Pasture & Range Handbook) uElzinga et al. 1998 (Measuring & Monitoring Plant Populations) uHerrick et al. 2005 (Monitoring Manual for Grassland, Shrubland and Savanna Ecosystems) uBureau of Land Management. 1996 (Sampling Vegetation Attributes) Resources – page 112

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