干旱区生态环境知识资源中心(Arid): 黑河下游湿地土壤有机氮组分剖面的分布特征

Arid

	黑河下游湿地土壤有机氮组分剖面的分布特征
其他题名	Profile distribution characteristics of soil organic nitrogen fractions in the lower reaches of the Heihe River wetland
	罗如熠; 张世熔; 徐小逊; 李婷
来源期刊	生态学报
ISSN	1000-0933
出版年	2015
卷号	35 期号:4 页码:956-964
中文摘要	结合野外调查,用Bremner法研究了黑河下游湿地不同土壤类型的有机氮组分,结果表明:在0-50 cm 土层,5种土壤有机氮均以酸解性氮为主,占全氮的71.04%-81.79%。泥炭土、沼泽土、草甸土、亚高山草甸土所含的酸解氮、非酸解氮和酸解氮组分氨态氮、氨基酸态氮、氨基糖态氮含量的剖面分布总体上均随土层深度的增加而呈降低趋势,而风沙土却相反,上述有机氮组分呈升高趋势。5种土壤酸解氮及其组分氨态氮、氨基酸态氮、氨基糖态氮占全氮比例的剖面分布总体上均随土层深度的增加而呈降低趋势,而非酸解氮却呈升高趋势。5种土壤酸解未知态氮含量及占全氮比例均在剖面分布上无明显特征。在0-30 cm各相同土层内,5种土壤酸解氮各组分含量及占全氮比例的大小顺序均为氨基酸态氮>氨态氮>未知态氮>氨基糖态氮;而在30-50 cm 土层,5种土壤酸解氮各组分含量及占全氮比例的大小顺序均无明显特征。此外,黑河下游湿地土壤干化、沙化过程中,表层0-10 cm 土壤有机氮组分含量变化明显,其中土壤氨态氮对生态环境变化最为敏感。
英文摘要	Nitrogen (N) is one of the most important element in plant growth and an important part of the global ecosystem substances circulation. Organic N is both the main form of soil N and pool of mineral N. Soil organic N plays an important role in soil fertility, N cycling and environmental protection. Usually, the concentration and distribution of soil organic N mainly affected by soil types, soil level, rhizospheric environment, fertility and farming conditions, etc, and the chemical forms and status of soil organic N is the important factor affecting the availability of soil N. Currently, researchers have focused more on effect of different land use systems on changes of soil organic N fractions,dissolved organic N,particulate organic N and microbial biomass N,as well as effect of different fertilization and irrigation approaches on concentrations and composition of organic N fractions by using the Bremner’s method to separate soil organic N fractions. Combined with filed investigation, five types of soil samples in the lower reaches of Heihe river wetland were collected, and the organic N fractions were studied using the Bremner’s method, the results showed that acidolysable N was the dominant fraction of organic N in all the soil samples (0-50 cm soil layer), and the proportion of acidolysable N to total N was from 71.04% to 81.79%. The concentrations of acidolysable N,non-acidolysable N and acidolysable N fractions (ammonia N, amino acid N,amino sugar N) of Peat soil,Boggy soil,Meadow soil,Subalpine meadow soil decreased,but increased in the Aeolian sandy soil generally with soil depth in the profile. Furthermore, the proportions of acidolysable N and acidolysable N fractions (ammonia N,amino acid N,amino sugar N) to total N of all the soil samples generally decreased with soil depth in the profile distribution, while the proportion of non-acidolysable N to total N generally increased with soil depth in the profile distribution. The concentration of acidolysable unknown N and the proportion to total N of all the soil samples did not show any specific characteristics. In addition, in the same soil layer (0-30 cm),the concentrations of acidolysable N fractions and the proportions to total N varied as the followings : amino acid N > ammonia N > unknown N > amino sugar N ; However, in 30-50 cm soil layer, the concentrations of acidolysable N fractions and the proportions to total N of the soil did not show any typic characteristics. Besides, the soil organic N fractions in the surface soil (0-10 cm) changed obviously along with the soil desiccation and desertification in the lower reaches of the Heihe River wetland,and the soil ammonia N of soil was the most sensitive one to the ecological environment factors.
中文关键词	黑河下游湿地 ; 有机氮组分 ; 剖面 ; 分布特征
英文关键词	Heihe River wetland organic nitrogen fractions profile distribution characteristics
语种	中文
国家	中国
收录类别	CSCD
WOS类目	BIOLOGY
WOS研究方向	Life Sciences & Biomedicine - Other Topics
CSCD记录号	CSCD:5367453
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/233153
作者单位	四川农业大学资源环境学院, 四川省土壤环境保护重点实验室, 成都, 四川 611130, 中国
推荐引用方式 GB/T 7714	罗如熠,张世熔,徐小逊,等. 黑河下游湿地土壤有机氮组分剖面的分布特征[J],2015,35(4):956-964.
APA	罗如熠,张世熔,徐小逊,&李婷.(2015).黑河下游湿地土壤有机氮组分剖面的分布特征.生态学报,35(4),956-964.
MLA	罗如熠,et al."黑河下游湿地土壤有机氮组分剖面的分布特征".生态学报 35.4(2015):956-964.