植物营养与肥料学报2013,19(5)；1174-1182 Joumal of Plant Nutrition and Fertilizer
doi: 10. 11674/zwyf.2013. 0517
不同因素交互作用对棕壤硝态氮累积及pH值的影响
沈月，依艳丽“
（沈阳农业大学土地与环境学院，农业部东北土壤与环境重点开放实验室，沈阳110866)
摘要：本文采用室内恒温好气培养法，研究了温度（10℃和30℃）、水分（田间持水量的70%和100%）及尿索态氮用量（N0、450600、750）mg/kg的交互作用对硝态氮累积和土壤酸化的影响。结果表明，10℃下硝化作用进行缓慢，最大硝化率(K.）与施氮量呈极显著负相关(r=-0.935"），达到最大硝化率的时间（t。）与尿素态氮用量呈极显著正相关（r=0.876*）。30℃下的硝化率随尿素态氮用量的增加而增加。低温环境延长了。10℃（70% 和100%含水量）下，N750mg/kg处理的t。分别相当于30℃下该处理的1.9和2.5倍。所有处理土壤的硝态氮累积量均随培养热量的增加呈指数增长趋势，且70%含水量下的累积量高于100%含水量下的累积量，N600和750 mg/kg处理的累积量显著高于其他处理。培养结束后，30℃所有处理的pH值均显著低于初始土填，其中N600和 750mg/kg处理的pH<5.1，酸化明显。通径分析结果表明，尿素施用量和培养天数是影响硝化率进而影响pH值的重要因素，其次是培养温度和含水量。
关键词：温度；尿索；含水量；最大硝化速率；pH
中图分类号：S153.4；S152.3
文麟标识码：A
文章编号：1008505X(2013)05-1174-09
Effects of interaction of differentfactors on nitratenitrogenaccumulation
andpHofbrownsoil
SHEN Yue, YI Yan-li*
( College of Land and Enwironment, Shenyang Agricultural University/Key Laboratory of Northeast Soil and
Eneironment，Ministry of Agriculture,Shenyang 110866,China)
Abstract: A constant temperature incubation experiment was conducted to evaluate effects of temperature (10°C and 30℃), soil moisture content (70% and 100%), urea-nitrogen rate (0, 450, 600 and 750 mg/kg) and their interaction on nitrate-nitrogen accumulation and soil acidification. The results show that nitrification is slowly under 10C, and significantly negative and positive correlations are found between K. (maximal nitrification rate) and urea-nitrogen rate (r = 0. 935**), to(time of maximal nitrification rate) and urea-nitrogen rale (r =0. 876**), respectively. The nitrification rate is increased as the increase of the urea-nitrogen rate under 30°C. Days of fg are prolonged under the low temperature. The f values of the urea-nitrogen rate of 750 mg/kg under 10C are 1. 9 and 2. 5 times larger than those under 30°C with soil moisture of 70% and 100% , respectively. An exponent increasing trend is found between the nitrate nitrogen accumulation and the degree days after urea application in all treatments, and the accumulation amount is higher with soil moisture content of 70% than that of 100%. Significant accumulations are found under the urea-nitrogen rates of 600 and 750 mg/kg. Soil pH values of all treatments are lower than that of the initial soil under 30°C , and pH values of urea-nitrogen rates of 600 and 750 mg/kg are less than 5. 1, which shows a significant acidification. Results of the path analysis show that amount of urea-nitrogen and incubation day are two key factors that affected nitrification rate and then affected soil pH, and the other factors are incubation temperature and soil moisture content.
收稿日期：2013-03-14
接受日期：20130523
基金项目：高等学校博士学科点专项科研基全(20101045011213)；国家自然科学基金（41171192)项目资助。
作者简介：沈月（1984一），女，辽宁沈阳人，博士研究生，主要从事土境酸化方面研究。E-mail；shenyue211@126.con
+通信作者E-mail：yiyanli@126.com
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