The spatial heterogeneity of soil physical and chemical properties and comprehensive fertility in the Leizhou Peninsula coasta.

6 , the effects of all factors on soil fertility were highly significant ( p < 0.01).

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Changes in carbon and nitrogen content in plants and soil According to Table 2 , TN content exhibits a decreasing trend across the various ecosystem layers in the order of tree layer > understory layer > litter layer > soil layer, whereas TC content follows the order of tree layer > litter layer > understory layer > soil layer.

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The soil fertility factors in the western coastal area exhibit a clear trend of increasing with the decrease of latitude.This is analogous to the conclusions derived from the study on the physical and chemical properties of soil in different-aged Eucalyptus urophylla plantations on the Leizhou Peninsula .where the physical and chemical properties of forests near the western coast generally show a trend of being lower in the north and higher in the south 25 , 26 .

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