Concentration Ratios for Plants in Tropical Environments

TRS 472 summarizes specific data for tropical environments published prior to 2006. However, at that time, the definition of what comprised 'tropical data' was unclear and there were no specifically defined criteria for inclusion. The data used to derive the CR_plant-soil values published in TRS 472 for tropical environments included those obtained from regions as diverse as the Mediterranean and Middle East, southern and eastern Asia, northern Australia, Oceania and northern South America. A thorough review ensured that only those data in TRS 472 that conformed with the K-G climate classifications for tropical climates were considered in MODARIA II. The amended reference base used in TRS 472 for tropical environments was supplemented with additional studies published in the period 2006–2019 that conformed with the K-G climate criteria. This chapter describes the outcome of the data collation for tropical environments undertaken in MODARIA II and presents the CR_plant-soil summary values derived from the data.