鼎湖山季风常绿阔叶林土壤酸度对土壤养分的影响

通过在鼎湖山季风常绿阔叶林的研究发现 :( 1 )季风常绿阔叶林土壤整个剖面 ( 0～ 60cm)pH值都较低 ,小于 4 5。 ( 2 )土壤养分含量随着土壤剖面层次 ( 0～ 2 0cm、2 0～ 40cm、40～ 60cm)的降低而下降。养分除水解性N外 ,有效P、速效K以及交换性Ca、Mg含量都很少。 ( 3 ) 0～ 2 0cm土壤养分比其它层的土壤养分更容易受到土壤酸度的影响。 40～ 60cm土壤养分除了交换性Ca外 ,其它养分的含量与土壤酸度无显著关系。就不同月份来说 ,1月份和 4月份土壤养分比 7月份和 1 0月份土壤养分容易受到土壤pH值的影响。不同养分比较 ,交换性Ca和Mg以及有效P含量比其它养分更容易受到土壤酸度的影响。

EFFECTS OF SOIL ACIDITY ON THE SOIL NUTRIENTS UNDER DINGHUSHAN MONSOON EVERGREEN BROAD-LEAVED FOREST

The soil acidity affects soil nutrients. Sampling in Dinghushan monsoon evergreen broad-leaved forest, we find: (1) The pH values of all soil layers(0~20 cm, 20~40 cm, 40~60 cm) in Dinghushan monsoon evergreen broad-leaved forest are below 4.5. (2) The concentrations of all nutrients in soil samples analyzed decrease with the depth of the soil profile. Except for hydrolytic N, the concentration of available P, available K, exchangeable Ca and exchangeable Mg are all very low. (3) The nutrients in 0~20 cm soil layer are more easy affected by soil acidity than other soil layers. In 40~60 cm soil layer, the concentration of nutrient are not markedly correlative with soil acidity except for Ca. In January and April, the soil nutrients are more easily affected by soil acidity than in July and October. As for nutrient type, the content of exchangeable Ca, exchangeable Mg and available P are more significantly correlative with soil acidity than other nutrients.