摘要
以三峡重庆库区柑橘种植农户调查资料和土壤测试分析数据为基础,从区域角度出发,分析了柑橘园生产体系中的磷肥施用特征和磷素平衡状况。结果表明,果园磷肥平均投入量为P 228.8 kg/hm2,主要来源于复合肥和普钙;其中通过有机肥投入的磷素水平为P 32.7 kg/hm2,主要来源于畜禽粪尿。柑橘园的总体磷盈余量为P 107.6kg/hm2,其中以脐橙和锦橙园较高。果园磷素投入与磷养分盈余量之间存在极显著的正相关关系,说明过量施用磷肥是磷盈余量高的主要原因。随着磷盈余量增加,果园土壤速效磷呈增加趋势,土壤环境磷素负荷增加;以脐橙和锦橙园较高。果园较高的磷素负荷可能对三峡库区土壤和水环境具有很大的污染风险。
Based on the data collection through farmer interviewing and agricultural statistics database,the characteristics of phosphorus（P） fertilizaion and surplus were studied in Three Gorges area in Chongqing city.The result shows that the average application rate was P 228.8 kg/ha,with a main source of compound fertilizers and Calcium superphosphate;The input rate through manure application was P 32.7 kg/ha,with a main source of animal waste and manures.Surplus in the orchards of the Navelorange,Jinchen were relatively higher than other orchards.The average P surplus was 107.6 kg/ha.Positive correlation was found between P surplus and applied P rate in orchards.Excessive P fertilizer input led to the increase of P surplus.Further,with the increase of P surplus,soil available P of orchard soil tends to increase,high P input in the orchards of some regions led to very high rate of P load to soil environment.Soil environmental P load in these orchards of the Navelorange and Jinchen were higher than the other orchards of Three Gorges area in Chongqing.Very high rate of P load in orchards will probably led to very high soil and water environmental risk in Three Gorges area.
出处
《植物营养与肥料学报》
CAS
CSCD
北大核心
2011年第3期616-622,共7页
Journal of Plant Nutrition and Fertilizers
基金
公益性行业科研专项-最佳养分管理技术研究与应用(201103003)
国家科技支撑计划(2006BAD10B08
2007BAD47B04)
中央高校基本科研业务费专项资金(XDJK2009C119)资助
关键词
三峡库区
柑橘园
磷素
平衡
Three Gorges area
citrus orchards
phosphorus
balance
