西南喀斯特环境移民示范区柑桔园土壤营养状况研究  

Study on State of Soil Nutrient of Citrus Orchards in Southwest China Demonstration Area of Environmental Immigrants

作　　者：何铁光[1] 肖润林[1] 石雪晖[2] 

机构地区：[1]中国科学院亚热带区域农业研究所,湖南长沙410125 [2]湖南农业大学园艺园林学院,湖南长沙410128

出　　处：《农业现代化研究》2003年第3期225-229,共5页Research of Agricultural Modernization

基　　金：国家十五科技攻关项目"喀斯特(岩溶)峰丛洼地生态重建技术与示范(2001BA606A-8)";中国科学院重点项目"区域农业安全高效生产技术研究与示范"(NK十五-D-15)。

摘　　要：本文对桂西北环江县中科院科技扶贫基地肯福示范场柑橘示范园92片果园土壤营养状况的分析表明,该示范园有机质含量丰富,全氮、全磷偏低,水解氮、有效磷基本适宜,钾素缺乏,土壤偏酸性;果园之间主要土壤养分的变异系数都在16%以上,土壤pH值的变异系数为4.5%。不同产量级果园土壤养分的差异,主要表现在水解氮和速效钾含量上,是低产园提高产量的限制因素,水解氮和速效钾与柑桔产量分别有极显著和显著的相关性,初步提出了果园土壤水解氮、速效钾的丰缺指标。The results of soil fertility of 92 orchards in the citrus demonstration orchards of Kenfu demonstration plot were as follow:soil fertility on the area was characterized by abundant organic matter,low total nitroge,total phosphorus and potassiun,optimum hydrolyable nitrogen and available phosphorus,and strong acifity.The major nutrient variable coefficient in soil in different citrus orchards are over 16% and pH variable coefficient of the soil is 45%.The citrus orchards of different yield grades showed that the most significant soil chemical characteristic relatives to citrus nutrition seems to the amount of readily hydrolyable nitrogen and available potassium.And that was the restriction factor effect on the improving of the output.As a result,there was an extremely positive correlation between citrus yields and hydrolyable nitrogen and available potassium.Also,the indexes of anundance and shortage of hydrolyable nitrogen and available potassium in soils were put forward in this paper.

关 键 词：环境移民示范区 柑桔园 土壤营养状况 土壤养分 变异系数 土壤培肥 西南喀斯特地区 

分 类 号：S666[农业科学—果树学] S158[农业科学—园艺学]