摘要
生物固氮是生态系统中一个重要的自然过程,研究中国不同区域农业固氮输入及历史变化,对于农业系统活性氮源分析和活性氮管理具有重要意义。根据各地区农田、牧草地面积和生物固氮因子,估算了近20年中国农业生态系统中作物培育产生的活性氮量。结果表明,中国农业生物固氮量近20年呈稳定态势,变化不大。2010年农田固氮植物培育产生的活性氮量为4.81 Tg N/年,其中豆科作物、水稻等为主要活性氮产生源。华北、东北和长江中下游地区农田固氮植物产生的活性氮量达到3.18 Tg N/年,是固氮植物活性氮产生量最大的3个地区,固氮植物活性氮空间分布上北多南少,东部地区大于西部地区。
Biological nitrogen fixation was an important natural part of agricultural eco-system.It was necessary to study the inputs and history changes of nitrogen fixation in different regions for the resource analysis and management of active nitrogen in agriculture system.Based on the cropland,grazing grassland and biological fixation rates,the active nitrogen from the crop planting in recent twenty years were estimated in this study.The results showed that the nitrogen fixation kept stable in recent 20 years.The active nitrogen from the planted crops and the grazing lands were 4.81 and 3.27 tons per year,respectively.The leguminous crops were the main sources of active nitrogen,followed by rice and sugarcane.The nitrogen fixation in north,northeast and the middle-lower reaches of Changjiang river was 3.18 tons per year and the three regions were the main source of active nitrogen.From the space perception the active nitrogen in north areas was higher than the south,and the east was higher than the west.
出处
《湖北农业科学》
北大核心
2013年第18期4333-4336,共4页
Hubei Agricultural Sciences
基金
国家自然科学基金重点项目(41030751)
国家自然科学基金面上项目(41273103)
国家自然科学基金项目(50908116)
关键词
中国农业生态系统
固氮因子
活性氮
氮素管理
时空分布
Chinese agro-ecosystem
nitrogen-fixing plants
active nitrogen
nitrogen management
temporal and spatial dis tribution
