植物营养与肥料学报Issue(6)：1393-1402,10.DOI:10.11674/zwyf.2013.0613
植茶年限对土壤团聚体氮、磷、钾含量变化的影响
Effects of ages of tea plantations on changes of nitrogen, phosphorus and potassium contents in soil aggregates
摘要
Abstract
Through field investigation and laboratory analysis , effects of ages of tea plantations on changes of nitrogen , phosphorus and potassium contents in soil aggregates were studied .Results show that the contents of soil available K are increased first and then decreased with the increase of particle sizes of soil aggregates , and higher values which are from 38.52 to 70.32 mg/kg are found in 0.5-0.25 mm particle size .The distributions of total P and total K and available N are relatively even in soil aggregates of all particle sizes , and their coefficients of variation are 2.77%-11.58%, 0.82%-3.72%and 5.98%-10.62%separately .However , the contents of total N and available P are increased with decrease of particle sizes of the soil aggregates , and higher values(0.40-0.98 g/kg and 8.53-29.32 mg/kg) are found in <0.25 mm particle size.Along with rising ages of the tea plantations the contents of total N and total P and available N and P present increasing trends in soil aggregates of all particle sizes.However, the contents of available K display decreasing trends , and the contents of total K show no significant changes .The contribution rates of nitrogen , phosphorus and potassium contents in soil aggregates ( >5 mm) are 45%-72%.Along with rising ages of the tea plantations , the contribution rates of >5 mm aggregates nutrient contents present increasing first and then decreasing trends , and higher values are found in tea plantations with ages of 23 and 31 years ( 60%-72%) .The nitrogen , phosphorus and potassium retaining capacities and supplying capacities are significantly different in soil aggregates with different particle sizes .Long-term cultivation of tea is beneficial to soil aggregates total N and P and available N and P accumulations .However , the contents of available K are decreased year by year , and the contribution rates of >5 mm aggregates nutrient contents are found to be higher in tea plantations with ages of 23 and 31 years, and declined somewhat afterwards .Therefore, in management of tea gardens , it is essential to adopt balanced application of nitrogen and potassium fertilizers , and in tea plantations which are older than 23 years, to use organic manure in addition , so as to promote the increase of soil aggregates content and improve the capacity of tea garden soil fertilizer conservation and fertilizer supply .关键词
植茶年限/土壤团聚体/氮/磷/钾Key words
tea plantation age/soil aggregates/nitrogen/phosphorus/potassium分类
农业科技引用本文复制引用
王晟强,郑子成,李廷轩..植茶年限对土壤团聚体氮、磷、钾含量变化的影响[J].植物营养与肥料学报,2013,(6):1393-1402,10.基金项目
国家自然科学基金项目（40901138）；四川省2012年度学术和技术带头人培养资金；四川省科技厅项目（2010JY0083）资助。 （）
