Abstract: To explore the characteristics of soil fertility quality in different nutrient management methods of pitaya land and reveal the change law of soil fertility quality,  4 treatments were conducted including farmyard manure (FM), alfalfa (AF), bio-organic fertilize(BOF), and litter coverage(LC), which were used to analyze the change of soil fertility indexes and identify the impact of soil fertility quality in different nutrient management methods. The results showed that with various nutrient management methods, the soil fertility was significantly different. The pH  was below 7 in LC, indicating weakly acidic, while it displayed weakly alkaline in other nutrient management. LC treatment showed better effects on increasing the contents of soil organic C, available P, available Mn and available Fe, while AF management did not showed benefit effects on soil organic C, total N and total K.The content of soil organic C and the majority of available elements displayed a lower level by  FM management as well as BOF management. The pH  had major impacts on soil available elements. In addition, there was a significantly positive correlation between soil macroelements and soil microelements. Using different nutrient management methods, the comprehensive soil fertility quality indexes were sorted as follows: LC（1.793）>AF（0.949）>FM（-0.995）>BOF（-1.747）. LC was a more suitable management method for soil nutrient accumulation, followed by AF and FM. BOF had the lowest effect on soil nutrient accumulation, but it had a good effect on improving crop yield.

Key words: pitaya land, nutrient management methods, soil fertility, principal component analysis, soil quality index

摘要： 为阐明火龙果地不同养分管理方式下土壤矿质养分变化特征，揭示土壤肥力质量变化规律，设置施用农家肥（farmyard manure，FM）、套种绿肥（alfalfa，AF）、施用生物有机肥（bio-organic fertilizer，BOF）与凋落物覆盖（litter coverage，LC）4种养分管理方式，通过分析不同处理的土壤肥力指标变化，明确不同养分管理方式对火龙果地土壤肥力质量的影响。结果表明：不同养分管理方式的土壤理化性质变化规律各异，在LC方式下pH低于7，呈弱酸性，其余养分管理方式下均呈弱碱性；LC对土壤有机碳（soil organic carbon，SOC）、有效磷（available phosphorus，AP）、有效锰（available manganese，AMn）、有效铁（available iron，AFe）等土壤养分增效显著，AF对SOC、全氮（total nitrogen，TN）、全钾（total potassium，TK）增效作用较弱，FM以及BOF下SOC及多数有效态元素含量相对较低；土壤速效养分受到pH的影响较大，大量元素与微量元素多呈极显著正相关；不同养分管理方式的土壤质量综合指数表现为，LC（1.793）>AF（0.949）>FM（-0.995）>BOF（-1.747）。LC为土壤养分积累较为适宜的管理方式，其次为AF，FM次之，BOF对土壤养分的积累效应最低，但其对提高作物产量具有较好的作用。

关键词: 火龙果地, 养分管理, 土壤肥力, 主成分分析, 土壤质量综合指数