土壤速效钾对模拟氮沉降增加的响应  

Soil Available K in Response to Simulated Nitrogen Deposition

作　　者：王强[1] 陈冬萍 温磊[1] 

机构地区：[1]萍乡高等专科学校 [2]萍乡市湘东镇中学,江西萍乡337000

出　　处：《萍乡高等专科学校学报》2010年第3期74-77,共4页Journal of Pingxiang College

摘　　要：通过野外模拟试验,研究氮沉降增加对土壤速效钾的影响。试验设计为5种处理,分别为N0(0kg.hm-2.a-1)、N1(60kg.hm-2.a-1)、N2(120kg.hm-2.a-1)、N3(240kg.hm-2.a-1)、Nr(氮沉降恢复),每个处理重复3次。以尿素[CO(NH2)2]作为氮源,每月以溶液方式对林地进行喷施。通过3年的处理后发现,氮沉降导致土壤速效元素总量的淋失,0～20cm土层中的速效元素对氮沉降的反应要比20～60cm土层更为敏感,且其速效元素的淋失与沉降时间呈正相关,而20～60cm土层还未出现一致的变化规律。A field experiment was set to study the effects of increased nitrogen deposition on soil available K.Treatments were designed as N0（0 kg·hm-2·a-1）、N1（60kg·hm-2·a-1）、N2（120kg·hm-2·a-1）、N3（240kg·hm-2·a-1）、Nr（resume of nitrogen deposition）,with threee replicates in each treatment.Urea was used as the source of nitrogen and its solutions were sprayed on the forest ground each month for three years.Nitrogen deposition lead to leaching of the available K,and 0-20cm was more sensitive to 20-60cm,with the nitrogen addition,the available K can leaching more,but there had not a same pattern in 20-60cm.

关 键 词：氮沉降 速效钾 

分 类 号：S152[农业科学—土壤学]