核农学报2017，Vol.31Issue(4)：757-767,11.DOI:10.11869/j.issn.100-8551.2017.04.0757
土壤pH对不同酸性敏感型水稻品种氮利用效率与根际土壤生物学特性的影响
Effect of Soil pH on Nitrogen Utilization Efficiency and Biological Characters of Rhizosphere Soil of Rice Varieties With Different Acid-sensitivity
摘要
Abstract
In order to discuss the soil biological mechanism of nitrogen utilization efficiency of rice affected by acidified soil,the correlation between nitrogen utilization efficiency indexes of rice and enzyme activities and microbe quantity in rhizosphere soil under different soil pH was studied by pot experiment.Wuyou308,an acid-sensitive rice variety and Jingchuyou 148,an acid-special rice variety were selected as experimental materials.The results showed that nitrogen grain production efficiency (NGPE) and nitrogen physiological efficiency (NPE) of Wuyou 308 significantly decreased with the decline of soil pH in range of 6.5 to 3.5,while its nitrogen harvest index (NHI) changed inconspicuously,and three indexes of nitrogen utilization efficiency of Jingchuyou 148 reached the maximum when soil pH was 5.0.Enzyme activity in rhizosphere soil of two varieties decreased with the decline of soil pH,while there were differences in two varieties and among different stages.Content of phosphate fatty acid (PLFA) at all stages of Wuyou 308 decreased with the decrease of soil pH,while that of Jingchuyou 148 reached the maximum when soil pH was 5.0.There was a significantly positive correlation between NGPE and NPE of Wuyou308 and activities of three kinds of soil enzyme,and there was a very significantly positive correlation between NHI and invertase activity.As for Jingchuyou 148,there was negative correlation between nitrogen utilization efficiency indexes and soil enzyme activities,and significant correlation was found between nitrogen utilization efficiency and activities of invertase and urease.It was also found a positive correlation between nitrogen utilization efficiency indexes of Wuyou 308 and soil microbe quantity,while the significance showed different among different stages and microbes.As for Jingchuyou148,there was a very significantly positive correlation between nitrogen utilization efficiency indexes and soil microbe quantity at tillering to booting stage,while the very significantly negative correlation existed between nitrogen utilization efficiency and soil microbe quantity at full heading stage.These results indicated that nitrogen utilization efficiency of acid-sensitive rice variety significantly decreased with the decline of soil pH,which mainly deduced by significant decrease of soil enzyme activities and soil microbe quantity,while nitrogen utilization efficiency of acid-special rice variety reached the maximum at pH value 5.0,and its correlation between nitrogen utilization efficiency and soil biological character indexes showed very different between those of acid-sensitive rice variety.This study preliminarily confirmed the soil biological mechanism of nitrogen utilization efficiency of rice affected by acidified soil,and provided reference for screening suitable rice varieties in acidified paddy field.关键词
水稻/土壤 pH/酸性敏感型/氮利用效率/土壤酶活性/土壤微生物Key words
rice/soil pH/acid-sensitivity/nitrogen utilization efficiency/soil enzyme activity/soil microbe引用本文复制引用
陈平平,郭莉莉,唐利忠,卢浩宇,袁珍贵,杨晶,易镇邪,屠乃美..土壤pH对不同酸性敏感型水稻品种氮利用效率与根际土壤生物学特性的影响[J].核农学报,2017,31(4):757-767,11.基金项目
国家自然科学基金项目(31171494),国家科技支撑计划项目(2011BAD16B01) （31171494）
