干旱区生态环境知识资源中心(Arid): 敦煌地区土壤剖面硝酸盐的迁移累积规律

Arid

	敦煌地区土壤剖面硝酸盐的迁移累积规律
其他题名	Migration and accumulation of nitrate in soil profiles in Dunhuang
	赵梦竹; 马金珠; 孙朋; 赵玮; 张琨
来源期刊	干旱区资源与环境
ISSN	1003-7578
出版年	2016
卷号	30 期号:5 页码:135-142
中文摘要	包气带是连接大气层和含水层的关键地带,研究土壤中硝酸盐的迁移累积规律对防止地下水硝态氮污染至关重要。选取我国西北干旱区敦煌盆地典型土壤为研究对象,测定各土壤剖面中的Cl~-和NO_3~-浓度,探究硝酸盐的迁移规律和影响因素。结果表明: Cl~-和NO_3~-主要集中在0 ~ 40cm近地表层土壤中,其硝酸盐的累积量占总累积量的80%以上,NO_3~-在1m的土壤剖面中呈S型迁移规律,适宜的含水率、疏松的土质和较高的植被覆盖度均有利于NO_3~-的垂向迁移; NO_3~-和Cl~-在沙漠中呈活塞式迁移规律,二者显著正相关并与含水率负相关,短暂的降雨和强烈的蒸发使硝酸盐在地表大量富集,深层土壤的含量高表明了硝酸盐的淋吸效应,较高的NO_3~- /Cl~-说明硝酸盐在干旱时富集度高。
英文摘要	Vadose zone is the key to connecting with the atmosphere and the aquifer; transfer and accumulation law of nitrate in soil is essential to prevent nitrate pollution in groundwater. We selected typical soils of Dunhuang in northwest China for the study object,measured the concentrations of Cl~- and NO_3~- in each soil profile, and explored the migration of nitrate and factors. The results showed that: Cl~- and NO_3~- mainly exist in 0-40cm soil near the surface,the cumulative amount of its nitrate is accounting for above 80% of the total cumulative amount in soil,NO_3~- has the S-shaped migration in the soil profile. Suitable moisture,loose soil and high vegetation coverage are conducive to vertical migration of NO_3~-. NO_3~- and Cl~-have the piston migration in the desert,both have significant positive correlation and negative correlation with the water content. Short rains and strong evaporation lot nitrate enriched in the surface. The high contents in deep soil show the suction effect of nitrate leaching. The high NO_3~- / Cl~-descript that nitrate is highly enriched during droughts.
中文关键词	敦煌 ; 土壤 ; 硝酸盐 ; 迁移
英文关键词	Dunhuang soil nitrate migration
语种	中文
国家	中国
收录类别	CSCD
WOS类目	MINERALOGY
WOS研究方向	Mineralogy
CSCD记录号	CSCD:5696389
来源机构	兰州大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/234366
作者单位	兰州大学资源环境学院, 兰州, 甘肃 730000, 中国
推荐引用方式 GB/T 7714	赵梦竹,马金珠,孙朋,等. 敦煌地区土壤剖面硝酸盐的迁移累积规律[J]. 兰州大学,2016,30(5):135-142.
APA	赵梦竹,马金珠,孙朋,赵玮,&张琨.(2016).敦煌地区土壤剖面硝酸盐的迁移累积规律.干旱区资源与环境,30(5),135-142.
MLA	赵梦竹,et al."敦煌地区土壤剖面硝酸盐的迁移累积规律".干旱区资源与环境 30.5(2016):135-142.