摘要
以下辽河平原一组长期定位试验为平台,研究了不同施肥制度下农田生态系统微量元素的循环率及当季微量养分收支。结果表明:不同元素在饲喂-堆腐过程中的循环率差异较大,Zn的循环率最低,但也接近80%,Fe、Mn、Cu、Pb的循环率均超过80%,其中Fe、Mn、Pb的循环率均接近90%,微量元素在饲喂-堆腐过程中的循环率随投料量的增加有增加的趋势。以有机肥形式输入农田的微量元素远大于以化肥形式输入农田的量,且输入量随有机肥用量的增加而增加。不同处理间微量元素的移出量以NPK+M处理最高,CK处理最低。各处理土壤微量元素收入小于支出,不同处理间收支差额NPK+M<M<CK<NPK,表明单施化肥加剧土壤微量元素赤字化,养分循环利用可弥补土壤微量元素的损失,减小收支差额。
A group of long-term field trials was conducted at the lower reaches of Liaohe Plain to study the effects of different fertilization modes on the recycling rates and current season budgets of trace elements in cropland ecosystems.In the process of feeding-composting,the recycling rates of trace elements varied with the elements.Zn had the lowest recycling rate which still approached to 80%,while Fe,Mn,Zn,and Pb had a recycling rate of〉80%,and especially that of Fe,Mn and Pb was〉90%.The recycling rate increased with the increasing amount of feed stuffs and bedding materials.The trace elements input of farmland from manures was far higher than that from chemical fertilizers,and increased with increasing amount of the manures applied;while the trace elements output by crops was the highest in treatment NPK＋M,and the lowest in treatment CK.The input was lower than the output,and the budget in different fertilization treatments followed the order of NPK＋M〈M〈CK〈NPK.Therefore,applying chemical fertilizers alone induced the deficit of soil trace elements,while nutrients recycling would offset the soil trace elements loss by crops,and minimize the deficit.
出处
《生态学杂志》
CAS
CSCD
北大核心
2010年第3期491-497,共7页
Chinese Journal of Ecology
基金
中国科学院创新项目(KZCX2-YW-407
KZCX2-YW-405)
国家科技支撑计划课题(2008BADA7B08)
沈阳环境工程重点实验室基金资助项目(ERCERR08014)
关键词
饲喂-堆腐过程
养分循环
下辽河平原
有机肥
化肥
feeding-composting process
nutrient cycling
lower reaches of Liaohe Plain
manure
chemical fertilizer
