槟榔种植年限对土壤肥力的影响

采用野外调查采样结合室内常规分析的方法,对槟榔种植不同年限的土壤养分和酶活性进行了研究.结果表明,土壤养分含量与种植年限有紧密联系,随槟榔种植年限增加,土壤有机质、全氮、全磷、全钾和速效氮、速效磷、速效钾含量呈现先增加后降低的趋势.与对照相比,种植槟榔5 a 后土壤有机质显著增加（P ＜0．05）；种植槟榔5~20 a,随种植年限的增加土壤有机质呈现下降趋势,差异极显著（P ＜0．01）；土壤速效氮、速效磷含量随槟榔种植年限的增加而逐步上升；种植年限5 a 到8 a 土壤速效钾从极缺水平上升到很缺,而种植年限从8 a 到20 a呈现降低趋势,接近极缺水平；总体来看,随槟榔种植年限的增加,土壤养分含量、土壤酶活性增强,说明种植槟榔能有效改善土壤肥力.种植8 a 槟榔园土壤肥力可上升一个级别.

Effects of Areca catechu Cultivation Years on Soil Fertility

The field survey sampling and conventional indoor analysis methods are used to study soil nu-trients and enzyme activity of betel with different cultivation years.The results showed that soil nutrient content had a close relationship with cultivation years,soil organic matter,total nitrogen,total phosphorus, total potassium and available nitrogen,available phosphorus,available potassium appeared in firstly in-creased and then decreased trends.Compared with the control,the organic matter in surface soil increased significantly;It gradually decreased from 5 to 20 cultivation years,highly significant difference appeared;The contents of soil available nitrogen and phosphorus gradually rose with increase of cultivation years,and at present time they are in a serious shortage.From 5 to 8 years of cultivation years,soil available K changed from the extreme scarcity level to very short level,while from 8 to 20 cultivation years,it showed a reducing trend,close to serious shortage.Overall speaking,after cultivating for 8 years soil fertility can be increased.With the increase of cultivation years of Areca catechu ,soil nutrient content and soil total salt content increased,and soil enzyme activities increased too,which indicates that planting Areca catechu can effectively improve soil fertility.After 8 years of cultivation,the soil fertility Areca catechu can rise to a high grade.