摘要
运用连续提取法结合常规方法,研究玉米—玉米—大豆轮作条件下,经过31年不同施肥后棕壤矿物吸附的p位钾、e位钾和i位钾的有效性及其剖面分布情况。结果表明:耕层土壤各位点钾含量及占全钾比例均表现为i位>e位>p位;长期单施化学钾肥或不施钾各位点钾含量降低,有机肥配施化肥可以维持土壤中各位点钾含量。相关分析表明,交换性钾与p位和e位钾相关性显著,相关系数分别为0.926*和0.886*;植株地上部吸钾量与p和e位钾呈显著正相关关系,与i位钾呈极显著正相关关系(r=0.963**);不同位点间钾含量呈极显著正相关关系。在剖面分布中,p、e和i位钾含量均表现为0—20 cm>20—40 cm。
The sequential extractions combined with conventional methods were used to study the availability of K adsorbed by clay minerals and the profile distribution under long-term fertilization of brown soil, with a maize- maize-soybean rotation. Results showed that the contents of K and the proportion in total K on arable layer presented as follows： i 〉 e 〉 p. Contents of p, e and i sites K with chemical K fertilizer application and no K fertilizer application decreased. And organic manure with K fertilizer application could remain the amount of K at a higher level. Correlation analysis indicated positive correlation between p-site K, e-site K and exchangable K, and the correlation coefficient were 0. 926 ＊ and 0. 886 ＊ , respectively. A positive significant correlation was observed between p-site K, e-site K and the uptake of K by crops. And there was a highly significant correlation between i sites and the uptake of K by crops （r = 0. 963＊ ＊ ）. There was an extremely significant positive correlation among p- site K, e-site K and i- site K. The tendency of contents of potassium were all changed with depth as follows： 0-20 cm 〉 20-40 cm.
出处
《植物营养与肥料学报》
CAS
CSCD
北大核心
2012年第6期1412-1417,共6页
Journal of Plant Nutrition and Fertilizers
基金
国家自然科学基金(31071861)
国家科技支撑计划(2011BAD16B12)项目资助
关键词
长期施肥
棕壤
吸附位点钾
表观平衡
有效性
剖面分布
long-term fertilization
brown soil
K adsorbed by clay minerals
apparent balance
availability
profile distribution
