海南胡椒优势区土壤pH值与养分肥力指标的相关性分析

对海南省胡椒优势区胡椒园土壤分0～20 cm和20～40 cm两层取样，用以研究海南胡椒种植区土壤pH值与养分含量之间的关系。结果表明，海南胡椒优势区土壤pH值在3.76～5.26之间，极强酸土壤占样品总数的54％，强酸土壤占样品总数的46％；约98％胡椒园土壤有机质含量在较低含量区间；碱解氮含量有85％在适宜值范围内；有效磷含量有54％低于适宜值范围；约54％胡椒园缺乏速效钾；交换性钙、镁含量均低于适宜值范围。线性相关性分析结果表明，土壤pH值与速效钾、交换性钙、镁含量有显著正相关关系，与有机质、碱解氮、有效磷含量相关性不显著；岭回归分析结果表明，土壤pH值与养分因子的相关性由强到弱为：速效钾>交换性钙>有机质>交换性镁>碱解氮>有效磷。因此，应该适当增施草木灰、石灰和有机肥，以提高胡椒园土壤pH值和培肥土壤。

Correlation Analysis Between Soil pH and Fertility Indicators in Hainan Black Pepper Advantageous Regions

In order to investigate the correlation between the soil pH with soil organic matter(SOM)and available nutrient concentrations, soil samples were collected at the depth of 0~20 cm and 20~40 cm soil layer from the main black pepper plantations in Hainan. The results showed that the soil pH was ranged from 3.76 to 5.26 in advantageous regions. Highly acidic and strongly acidic soil samples were accounted for 54% and 46% of the total soil samples, respectively. Across Hainan black pepper gardens, about 98% of soil samples were in lower interval for the SOM content, about 85% were in the appropriate range for available nitrogen(N), 54% of soil samples were below the appropriate value range for available phosphorus(P)content, about 54% of pepper garden were lack of available potassium(K), and exchangeable calcium(Ca)and magnesium(Mg)concentrations were lower than optimum value range. Pearson correlation analysis showed that the soil pH had significantly positive correlation with available nutrient concentrations of K, Ca and Mg. No evident correlation was observed for SOM, available N and available P. Ridge regression analysis indicated that relationship between the soil pH and nutrient concentration was arranged from strong to weak: K>Ca>SOM>Mg>N>P. It was suggested that appropriate increase in the input amounts of plant ash, lime and organic fertilizer were suggested to improve the soil pH and soil fertility in Hainan black pepper gardens.