海拔与加施有机肥对香榧果园土壤肥力的影响

Effects of altitude and organic fertilizer application methods on soil fertility of Torreya grandis orchard

为了解不同海拔条件下,加施有机肥对香榧果园土壤肥力的影响,以庆元县左溪镇青竹村(海拔1127 m)和五大堡乡西川村(海拔720 m)的香榧果园为试验地,在常规施肥的基础上,在追施壮果肥环节加施有机肥,分析不同海拔的香榧果园在加施有机肥后土壤肥力的变化。结果表明:加施有机肥后,香榧果园的土壤有机质、速效钾含量均达到国家绿色食品产地土壤肥力Ⅰ级标准;左溪镇青竹村香榧果园常规施肥处理的土壤有机质含量也达到国家绿色食品产地土壤肥力Ⅰ级标准,加施有机肥处理的土壤有机质、速效氮、速效钾含量与常规施肥处理的差异均达显著(P<0.05)。加施有机肥处理的土壤交换性钙及有效锰、铁、硼、锌、铜含量均高于常规施肥处理的,但两者间的差异性不显著(P>0.05)。以上结果说明,在追施壮果肥环节加施有机肥,可有效提高香榧果园土壤肥力,这一措施值得推广。

The two Torreya grandis orchards at Qingzhu Village of Zuoxi Town with altitude of 1127 m and Xichuan Village of Wudabao Town in Qingyuan County with altitude of 720 m were investigated,in order to understand the influence of organic fertilizer application on the soil fertility of T.grandis orchard at different altitudes.On basis of conventional fertilization,change of soil fertility was analyzed for T.grandis orchard at different altitudes after organic fertilizer supplementation.The results showed that after applying organic fertilizer,T.grandis orchard soil was rich in organic matter,available potassium,all of which reached the national grade I standard of soil fertility in green food production areas,except for the organic matter of T.grandis orchard soil at Qingzhu Village of Zuoxi Town under conventional fertilization treatment.There was a significant difference(P<0.05)between treatment supplemented with organic fertilizer and that of conventional fertilization for organic matter,available nitrogen,and available potassium.The contents of exchangeable calcium,manganese,iron,boron,zinc,and copper were higher than those of conventional fertilization treatment,and the difference was obvious but not significant(P>0.05).Therefore,it is suggested to apply organic fertilizer at the topdressing stage with enhanced soil fertility,which is worth popularizing.