海南山地橡胶园土壤养分流失特性研究

Study on properties of soil nutrient loss from mountanious region in rubber plantation in Hainan

对海南山地橡胶园土壤养分淋失特征研究结果表明,山地橡胶园土壤养分含量为:有机质9.06～15.68 g/kg、全氮0.47～0.87 g/kg、全磷(P2O5)0.53～0.89 g/kg、速效磷(P2O5)1.40～7.33 mg/kg、全钾(K2O)5.07～21.77 g/kg、速效钾(K2O)26.80～71.41 mg/kg,其中有机质、全氮、全钾和速效钾含量均低于天然热带雨林,全磷、速效磷含量略比天然雨林高。不同地形橡胶园土壤养分表现为:陡坡山地养分含量较低、淋失较强、富集较弱;谷地养分含量较高、淋失较弱、富集较强;中坡山地、中坡丘陵、碎原的养分含量介于陡坡山地和谷地之间,部分养分变化幅度也介于陡坡山地和谷地土壤间。

A field study of soil nutrient loss was conducted in red soil on sloping surface. The results showed that soil nutrients were that OM changed from 9.06 to 15.68 g/kg, total N changed from 0.53 to 0.89 g/kg, total P changed from 0.53 to 0.89 g/kg, available P changed from 1.40 to 7.33 mg/kg, total K changed from 5.07 to 21.77 g/kg, available K changed from 26.80 to 71.41 mg/kg. The OM ,TN,TK and available potassium are lower than the savageness tropical rain forest,but the TP and available P are appreciably high than the savageness tropical rain forest. The characteristic of nutrient in different terrain is that： the low nutrient content, strong eluviation and feeblish enrichment are in sloping fields crest. The high nutrient content, feeblish eluviation, strong enrichment are in the valley. The moderate Fields,moderate hilt and cracked campagna are intervenient the sloping fields crest and valley, some nutrient contents and change extent are intervenient the sloping fields crest and valley.