The nutrient P can be measured either as available P or total P. My question is: When looking at the change in plant species compositions, does it make a difference whether it is modeled against available or total P?
Further, is the (potential) difference present across habitats, or is it habitat specific? I specifically work on a salt meadow.
I hope that some of you know of studies, or have conducted them yourself, that can help me shed light on this question.
Phosphorus is available to plant as monophosphate as H2PO4 and biphosphate as HPO4 which is more available in neutral to alkaline in soil and in acid soil pH below about 5.5 phosphorous is less available to plant. Tricalcalcim phosphate Ca3(PO4)2 as rock phosphate less available to plant . Solubility of rock phosphate may be enhanced specially in acid soil by using soil amendment like lime or dolomite and phosphate soluble microorganisms.
Sum total of monophsphate , biphosphate, tricalcalcim phosphate known as total phosphate. Phosphate remain predominantly in acid soil as aluminium and iron phosphate and in neutral to alkaline soil as calcium phosphate.
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