Effects of exogenous calcium additions on the ecological stoichiometric characteristics of various organs and soil nutrients and their internal stability in <i>Pinus tabuliformis</i>.

Broadly speaking, the stoichiometric characteristics of Pinus tabuliformis seedlings are primarily influenced by the exchange calcium and water-soluble calcium, which have reached a highly significant level ( p < 0.01).

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With the increase of calcium concentration, soil contents of TC, TN, TP, AK, C:N, C:P, and N:P showed no significant differences ( p >0.05), while soil water-soluble calcium and exchangeable calcium exhibited significant differences and showed a trend of gradually increasing content ( p <0.05).

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Subsequently, with the increase of calcium concentration, the TC, TN, TP, and TK contents in each organ and the whole plant showed a decreasing trend, and when the calcium concentration reached 400 mg·kg -1 , they all significantly decreased compared to the control without calcium (except for the TP content in stems) ( p < 0.05).

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The changing trends of C:N and C:P ratios in Pinus tabuliformis seedlings in this study indicate that as calcium concentration increases, the growth rate of Pinus tabuliformis seedling roots initially slows down and then accelerates, showing an increasing trend when calcium concentration reaches 400 mg·kg -1 .

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