Hence, the soil organic carbon and the total nitrogen displayed a decreasing trend with the latitudinal gradients.
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The Latitudinal Patterns of Leaf and Soil C:N:P Stoichiometry in the Loess Plateau of China.
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The sentences
The concentrations of leaf N and P showed an increasing trend along the latitudinal gradients, which is a phenomenon that can be explained well by the Temperature-Plant Physiological Hypothesis ( Reich and Oleksyn, 2004 ).
The correlation between the leaf N:P and the different soil layer C, N, P nutrient concentrations was weakly ( P > 0.05), while the different soil layer C, N, P nutrient concentrations and leaf C:N, and C:P stoichiometric characteristics showed a significant or extremely significant positive correlation.