鼎湖山三种森林类型土壤养分特征及其相关性分析研究

Analysis on Soil Nutrient Characteristics and Their Correlation in Three Kinds of Forest in Dinghushan

对鼎湖山三种森林类型土壤p H值和养分特征及其相关性进行调查与分析,结果表明:鼎湖山三种森林类型土壤p H值在3.72~4.31之间,属于强酸性土,而且随着土壤深度增加p H值逐渐升高;土壤有机质在6.83~78.43 g·kg^(-1)之间,有机质较丰富。三种森林类型土壤全氮、碱解氮、全钾含量平均值分别为1.53 g·kg^(-1)、384.15 mg·kg^(-1)、24.86 g·kg^(-1),含量较高,而全磷、速效磷、速效钾含量平均值分别为0.44 g·kg^(-1)、14.29 mg·kg^(-1)、73.38 mg·kg^(-1),含量相对较低,各种形态钙、镁的含量也比较低。土壤养分含量基本上是季风常绿阔叶林>针阔叶混交林>马尾松林,而且随着深度增加而含量逐渐减少。土壤p H值与有机质、氮、磷、钾、钙、镁等养分都呈现出极显著负相关,而土壤有机质、氮、磷、钾等养分之间均表现为显著或极显著正相关。

This paper investigates and analyzes the soil nutrient and pH value characteristics in the three kinds of forest in Dinghushan, The results indicated that the soil pH value was between 3. 72 -4. 31 in the three kinds of forest in Dinghushan. It belonged to the strong acidic soil, and the soil pH value increased with soil depth increase gradually. The soil organic matter which was abundant was between 6.83 -78.43 g· kg-1. The average of content which was higher was 1.53 g · kg-1 ,384.15 mg·kg-1 ,24.86 g·kg-1 in soil total nitrogen, alkali solution nitrogen, total potassium respectively, but the average of content which was low relatively was 0. 44 g · kg-1, 14.29 mg ·kg-1 ,73.38 mg· kg-1 in total phosphorus, available phosphorus, availa- ble potassium respectively, and the content was also lower in various forms of calcium and magnesium in the three kinds of forest.The content of soil nutrient was monsoon evergreen broad - leaved forest 〉 needle broad - leaved mixed forest 〉 pinus mas- soniana forest basically, and the content reduced with depth in- crease gradually. It presented an extremely significant negative correlation between the soil pH value and organic matter, nitro- gen, phosphorus, potassium, calcium, magnesium and other nutrients, but it presented a significant or extremely significant positive correlation between the soil organic matter, nitrogen, phosphorus, potassium and other nutrients.