期刊论文

中文

环境科学

0250-3301

2009

30

4

1139-1145

10.3321/j.issn:0250-3301.2009.04.034

国家科技支撑计划项目（2007BAD87B11）； 中国科学院知识创新工程项目（KZCX3-SW-441）； 湖南省重点学科——环境科学学科建设项目；

本校为其他机构

以洞庭湖平原2个典型水稻土(红黄泥和紫潮泥)为对象,采用~(15)N示踪技术,研究了淹水培养条件下稻草+硫铵配施(S+~(15)NA)和单施硫铵(~(15)NA)土壤微生物和粘土矿物对化肥氮的固定与释放及氮的残留形态.结果表明,淹水培养条件下B_N(SMBN)总体变化趋势是在培养前期达到峰值,而后逐渐下降,最后趋于稳定.固定态铵在整个试验期间变化相对较小,但也随培养时间的延长而减少.淹水培养条件下,B_N以原有B_N为主.标记底物B_N的比例红黄泥为0.30%～6.67%;紫潮泥为1.00%～3.47%.微生物同化的标记底物硫铵氮的比例红黄泥为0.15%～20.65%,紫潮泥为2.06%～15.93%;有机无机配施处理(S+~(15)NA)均大于单施化肥(~(1...

Dynamics of immobilization of the labeled substrate N by microorganism and soil clay and its residue fractions in soils from the plough layers of two subtropical paddy soils (Reddish clayey soil, Purple alluvial soil) in the Dongting Lake floodplain were studied. A laboratory-flooded incubation experiment was composed of three treatments: control (CK), labeled ammonium sulphate group (15NA) and the combined of labeled ammonium sulphate and rice straw group (S + 15NA). During the incubation, microbial biomass N (BN) increased firstly and then those decreased and tended to stable subsequently, w...