Base cations and micronutrients in soil aggregates as affected by enhanced nitrogen and water inputs in a semi-arid steppe grassland

Soil properties determine the elevational patterns of base cations and micronutrients in the plant–soil system up to the upper limits of trees and shrubs

“…Soil exchangeable base cations were extracted with a 1 M ammonium acetate solution (Wang et al, 2017). Soil-available micronutrients were extracted using diethylenetriamine pentaacetic acid (DTPA) according to .…”

“…High soil pH can limit the availability of micronutrients of iron (Fe), manganese (Mn), and zinc (Zn;Reisenauer, 1988;Lucena, 2000;Rengel, 2007), while low soil pH can induce toxicities of trace metals constraining terrestrial net primary productivity (He et al, 2005;Reisenauer, 1988;Tian et al, 2016). The concentrations of soil base cations and available micronutrients were suggested to be positively and negatively correlated with soil pH, respectively, but both positively correlated with soil organic matter (SOM) concentration (Reisenauer, 1988;Wang et al, 2017). Concentrations of base cation and micronutrient can differ among plant tissues as a result of their slow translocation from the roots to the canopy (van der Heijden et al, 2015), distinct mobility among plant tissues (Warnock, 1970), and occurrence of remobilization during different physiological stages (Maillard et al, 2015).…”

Soil properties determine the elevational patterns of base cations and micronutrients in plant-soil system up to the upper limits of trees and shrubs

“…Soil 315 organic matter plays an important role in micronutrient retention due to its negative charge (He et al, 2005;Wang et al, 2015Wang et al, , 2017. This may be a reason for the positive relationships between SOC and micronutrients (although not always significant, Table 3).…”

“…High soil pH can limit the availability of micronutrients, such as iron (Fe), inducing Fe deficiency 50 chlorosis in plants as a result of suppressed chlorophyll synthesis (Lucena, 2000), while low soil pH can induce toxicities of Fe, manganese (Mn) and zinc (Zn) constraining terrestrial net primary productivity (He et al, 2005;Reisenauer, 1988;Tian et al, 2016). Both soil pH and soil organic matter (SOM) are fundamental controllers over soil base cation and micronutrient availability (Martens and 55 Westermann, 1991; Wang et al, 2017) and subsequently their concentrations in plant tissues. The concentrations of soil base cations and available micronutrients were suggested to be positively and negatively correlated with soil pH, respectively, but both positively correlated with SOM concentration (Reisenauer, 1988;Wang et al, 2017).…”

“…Both soil pH and soil organic matter (SOM) are fundamental controllers over soil base cation and micronutrient availability (Martens and 55 Westermann, 1991; Wang et al, 2017) and subsequently their concentrations in plant tissues. The concentrations of soil base cations and available micronutrients were suggested to be positively and negatively correlated with soil pH, respectively, but both positively correlated with SOM concentration (Reisenauer, 1988;Wang et al, 2017). Quantifying base cation and micronutrient concentrations in soils and plant 60 tissues (leaves, roots, shoots, and stems) can help understand the nutritional status and Biogeosciences Discuss., https://doi.org/10.5194/bg-2017-298 Manuscript under review for journal Biogeosciences Discussion started: 4 August 2017 c Author(s) 2017.…”