摘要
根据国外资料,综述了有机农业土壤氮素流失规律与防止措施。综述指出,虽然有机农业生产方式可有效地减少氮素流失,但仍然存在流失的可能性。有机氮肥只有在微生物降解为可溶性氮素后,才能被作物大量吸收。这种降解过程是持续进行的、受诸多因素影响的。可溶性氮素流失的规律与集约农业相似,土壤可储藏氮素的观念是错误的。田间植物对氮素的吸收和合理的氮肥使用技术,可有效地减少氮素淋失。
The present paper reviews biogeochemical cycle of nitrogen in agroecosystem. It has been emphasized that although nitrogen leaching is reduced efficiently on organic farming, a possibility of leaching losses still exists. Organic fertilizers can only be available as plant nutrient after being biological degraded by microorganisms. This degrading process is continually and influenced by a variety of factors. Leaching of soluble nitrogen in organic agriculture resembles in conventional agriculture. The concept that soil is a stable storage for nitrogen may be not acceptable while nitrogen up-taken by plants and rational organic fertilizer utilization can reduce leaching efficiently.
出处
《农业环境保护》
CSCD
北大核心
2002年第1期90-92,共3页
Agro-Environmental Protection
