中文摘要：

[目的]调查与评估火龙果园土壤养分及重金属等元素变化状况,以期为广西火龙果主产区果园科学施肥管理提供科学依据。[方法]采集广西火龙果主产区33个果园土壤样本,分析土壤有机质和氮、磷、钾、钙、镁、铁、锌及具有主要危害性的重金属元素含量。[结果]广西主要火龙果园土壤pH偏低多呈酸性,其中69.7%果园土壤处在酸性和强酸性的范围;土壤有机质含量比较丰富;土壤有效氮缺乏、有效磷较高、有效钾分布不均匀;土壤有效钙、镁、铁含量比较高,土壤有效锌比较缺乏;不同种植年限果园土壤有机质、土壤全量氮、磷、钾养分随着种植年限的增加累积增高,土壤pH、土壤有效氮养份含量则随着果园年限呈递减趋势;土壤重金属随着果园年限增加累积增高。[结论]土壤偏酸,土壤有效氮、锌含量低,磷、铁含量过高是当前广西火龙果园土壤主要养分问题;随着种植年限的增加,土壤全量养分、重金属含量逐年累积增加,土壤酸化加重,也加剧了广西火龙果园土壤环境的污染风险。

英文摘要：

[ Objective ] In order to provide a scientific reference for the management of fertilizing in pitaya orchard in Guangxi, the status ofsoil nutrients and heavy metals were investigated and evaluated. [ Method] The contents of organic matter（ OM）, nutrients N, P, K, Ca,Mg, Fe, Zn and harmful and heavy metal elements in soil samples of 33 pitaya orchards were collected from main pitaya producing areas ofGuangxi were determined. [ Result] Soil pH of pitaya orchards in Guangxi was low, 69.7 % pitaya orchards were in acidic and strong acidrange; soil organic matter content was abundant; the available nitrogen was shortage,while available P was higher;available K was not dis-tributed uniform;The available Ca, available Mg, available Fe were higher but available Zn was very shortage. The contents of organic mat-ter, total N, P,and K in soil obviously increased with the increasing of cropping years, when pH value and the contents of available nitrogendeclined with the increase of planting years ;The contents of heavy metals in soil increased with the increasing of planting years. [ Conclusion]On the whole, lower soil pH and lower content of soil available nitrogen, zinc and higher content of soil available phosphorus, iron are themainly problems in soil of pitaya orchard at present; with the soil acidification and total nutrient and heavy metals accumulated with the in-creasing of planting years in soil, which also exacerbated the risk of contamination in the soil environment of the pitaya orchard in Guangxi.