文档介绍：农业环境科学学报 2011,30(4):697-703
Journal of Agro-Environment Science
宁夏黄灌区稻秆还田对硝态氮流失量的影响
王永生,黄
剑,杨世琦*
(中国农业科学院农业环境与可持续发展研究所;农业部农业环境与气候变化重点开放实验室,北京 100081)
摘
要:为控制稻田土壤硝态氮流失,对宁夏黄灌区稻田设置不同量秸秆还田处理:常规施肥不还田(CK)、常规施肥条件下稻秆分
别半量(T1)与全量(T2)还田,采用树脂芯法测定了稻秆还田 10、20、30 cm 土层硝态氮淋失量。结果表明,稻秆还田可以有效减少 30
cm 处硝态氮淋失量,减少比例在 %左右。从生育期内来看,前期流失量大于后期,但在后期 120 cm 土层渗滤液中硝态氮含量在
10 mg·L-1 以下,对地下水污染没有威胁。稻秆还田条件下,前期土壤硝态氮含量较低,减少了硝态氮淋失的可能性,后期 N 素得到
释放而促进了水稻的生殖生长,产量得到增加。因此,稻秆还田可以作为源头控制稻田硝态氮流失的较好措施加以推广。
关键词:硝态氮;淋失量;秸秆还田;树脂芯
中图分类号:S181
文献标志码:A
文章编号:1672-2043(2011)04-0697-07
The Influence of Rice Straw Returning on the Leaching Losses of the Nitrate Nitrogen in Ningxia Irrigation
District, China
WANG Yong-sheng, HUANG Jian, YANG Shi-qi*
(Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences Key Laboratory of Agro-
Environment and Climate Change, Ministry of Agricultural, Beijing 100081, China)
Abstract:Ningxia Irrigation District is the representative irrigation farming region in the upper stream area of the Yellow River. The paddy-
upland rotation is still the typical agricultural model in this irrigation district. The crude farming methods are used in the paddy planting, such
as uncontrolled irrigation and excessive fertilization, therefore there is a high accumulation of the residual nitrate nitrogen in soil after the
harvest. A f