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Performance of Soil Condition Indicators Across Taxonomic Groups and Land Uses

^a Landcare Research, Private Bag 3127, Hamilton, New Zealand

View larger version (14K): [in a new window]   Fig. 1 Box-and-whisker plots of microbial respiration (µg CO2–C cm-3 h-1), microbial biomass (µg C cm-3 soil), and potentially mineralizable N (µg N cm-3 soil) under pasture, crop, indigenous forest, and radiata pine plantation sites on nine soil great groups in New Zealand. The median of each category is shown by the center line; the box hinges represent the interquartile range. The whiskers show the range of values that fall within 1.5 times the interquartile range. Values significantly (95%) greater or less than 1.5 or 3.0 times the interquartile range are displayed as asterisks or open circles, respectively

View larger version (11K): [in a new window]   Fig. 2 Box-and-whisker plots of soil pH, total C (µg C cm-3), and Olsen P (µg P cm-3 soil) under pasture, crop, indigenous forest, and radiata pine plantation sites on nine soil great groups in New Zealand. See Fig. 1 legend for explanation of box plots

View larger version (13K): [in a new window]   Fig. 3 Box plots of total available water (% v/v), macroporosity (% v/v), and bulk density (Mg m-3) under pasture, crop, indigenous forest, and radiata pine plantation sites on nine soil great groups in New Zealand. See Fig. 1 legend for explanation of box plots

View larger version (19K): [in a new window]   Fig. 4 (A) Principal component plots of Factor 1 (38% of the variation) and Factor 2 (23% of the variation), showing grouping of sites under pasture, crop, indigenous forest, and radiata pine plantation, using all soil quality indicators. (B) A loading diagram showing how the various indicators influenced the separation and grouping: +, indigenous forest; , pine forest; , pastures; , cropping and market gardening

View larger version (16K): [in a new window]   Fig. 5 (A). Principal component plots of Factor 1 (32% of the variation) and Factor 2 (26% of the variation), showing grouping of sites under pasture, crop, indigenous forest, and radiata pine plantation, using a reduced set of six soil quality indicators. (B) A loading diagram showing how the individual indicators contributed to separation and grouping: +, indigenous forest; , pine forest; , pastures; , cropping and market gardening