pivot points and responses by polygon

Description

Data from: Thoma, D.P., S.M. Munson & D.L. Witwicki 2018. Landscape pivot points and responses to water balance in national parks of the southwest U.S. Contact: David Thoma Dave_thoma@nps.gov 406-994-7725 These data are the polygon attributes and linear regression coefficients of iNDVI and water balance relations for years 2000-2014 where we found significant relationships (P-val < 0.10). Polygons greater than 6.25 ha (the area of a single MODIS pixel) were delineated along ecological site boundaries or, in areas where ecological sites have not been mapped, along soil or vegetation map unit boundaries (Witwicki et al. 2016). Ecological sites are unique combinations of vegetation and soil properties that provide an organizing framework for understanding management-relevant patterns in production at landscape scales (Herrick et al 2006; Munson et al. 2016b). Data from this digital file were used to create figures 3-5 in “Landscape pivot points and responses to water balance in national parks of the southwest U.S.” Column definitions Park: four letter code that identifies park unit arch = Arches National Park blca = Black Canyon of the Gunnison National Park cure = Curecanti National Recreation Area cany = Canyonlands National Park care = Capitol Reef National Park dino = Dinosaur National Monument zion = Zion National Park Polygon: polygon identifier randomly generated Area: polygon area (hectares) Latitude: latitude in decimal degrees based on the World Geodetic System (WGS) 1984 Longitude: longitude in decimal degrees based on the World Geodetic System (WGS) 1984 Waterbalance: a water balance variable significantly related to annual production (iNDVI) for the polygon D= annual sum water deficit (mm) AET = annual sum actual evapotranspiration (mm) PCRP = annual sum precipitation (mm) SM = annual average soil moisture (mm) Response: slope of the regression between annual production and annual water balance. Units are change in iNDVI per 1000 mm of water balance term listed in the Waterbalance column Pivot: the pivot point, the water balance amounts at which production shifted from above to below average values for the polygon and associated water balance variable. SE: standard error of the pivot point (mm) Correlation: Pearson’s correlation between iNDVI and annual water balance rsq: coefficient of determination of the regression between iNDVI and annual water balance pval: p value of the regression between iNDVI and annual water balance slope: topographic slope of the ground surface (degrees) at the center of the target polygon aspect: topographic aspect (degrees) at the center of the target polygon whc: spatially weighted polygon average of water holding capacity (millimeters) which is water at field capacity minus water at wilting point in the top meter of soil. Field capacity is water remaining in the soil after excess has drained by gravity (−0.33 bar suction pressure). Permanent wilting point is water held too tightly for plant use ( −15 bar of suction pressure). Sand: spatially weighted polygon average of percent sand in top meter of soil that intersected the target polygon Clay: spatially weighted polygon average of percent clay in top meter of soil that intersected the target polygon Soil Depth: spatially weighted polygon average depth of soil (centimeters) that intersected the target polygon Vegetation: dominant vegetation type of the target polygon Elevation: elevation (meters) at the center of the target polygon Annual PCRP: annual sum of precipitation at center of the target polygon (millimeters)

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