干旱区生态环境知识资源中心(Arid): 贺兰山西坡不同海拔梯度草地土壤氮特征

Arid

	贺兰山西坡不同海拔梯度草地土壤氮特征
其他题名	Total soil nitrogen in the grasslands at different elevations on west-slope of Helan Mountain,Inner Mongolia
	傅华; 裴世芳; 张洪荣
来源期刊	草业学报
ISSN	1004-5759
出版年	2005
卷号	14 期号:6 页码:50-56
中文摘要	以阿拉善左旗境内贺兰山中段（西坡）及山前地带不同海拔下的草地为研究对象，分析不同海拔梯度下草地土壤全氮的分布特征及其与气候因子、植被特征和土壤特性的关系。结果表明，土壤全氮含量随海拔的降低而逐渐降低，在典型草原中沿土壤垂直剖面依次降低，在高寒草甸、荒漠化草原和草原化荒漠0～20与20～40cm土层中差异不显著，但高于40～60cm土层。在海拔1360～l380m草原化荒漠的5个样地上。由于放牧利用程度和植被类型的不同，0～20cm土层土壤氮的含量变幅在0．0228％～0．0347％。0～20，20～40和40～60cm土层土壤全氮含量与年降水量、植被盖度、草地生产力、土壤含水量、有机碳含量和〈0．05mm颗粒含量呈极显著正相关，与年均温、土壤pH值呈极显著负相关（P〈0．001）。偏相关分析显示，影响0～20cm土层全氮（TN）含量最主要的因素是植被盖度（C）和年降水量（AP），相关方程是TN％=0．002040C＋0．000585AP-0．076800；而影响20～40crn七层全氮含量的最主要因素是草地生产力（B）．与土壤全氮回归方程为了TN％=0．00l6B＋0．0247。而各环境因素中影响土壤全氮含量最主要的因素，0～20cm土层为土壤有机碳和年降水量，20～40cm土层主要受土壤有机碳的影响。
英文摘要	This study analyzed the total soil nitrogen content （TSN） of grasslands at different elevations on the west slope of Helan Mountain in Alxa, Inner Mongolia. Factors which affect nitrogen distribution such as annual precipitation, temperature, plant coverage and productivity, soil water content, 〈0.05 mm particle con tent, soil organic carbon, and soil PH, were measured. The results indicated that TSN content declined with decreasing altitude in the following order： alpine meadow 〉classical steppe〉 desert steppe 〉 steppe desert. In the classical steppe, TSN content showed a decline along the vertical soil profile. In the alpine meadow, desert steppe and steppe desert, TSN content showed no difference between the 0-20 and 20-40 cm soil layers, however TSN was higher in these layers than in the 40-60 cm layers. In the five steppe desert （elevation 1 360 - 1 380 m）, because of different grazing degree and plant type, TSN content in the 0-20 cm layer changed from 0.022 8 % to 0.034 7 %.Total soil nitrogen in the 0-20, 20-40 and 40-60 cm soil layers were positively correlated with annual precipitation, plant coverage, plant productivity, soil water content, SOC, and d0.05 mm particle content （P 〈0. 001）, and negatively correlated with average temperature and soil pH value（P〈0. 001）. The most important factors affecting TSN in the 0-20 cm soil layers were plant coverage and annual precipitation,with the relationship described as： TN%=0.002 040 C＋0.000,585 AP-0.076 800. In the 20-40 cm soil layers, TSN was mostly affected by productivity with the relationship given as： TN% =0. 001 6 B＋0. 024 7. Among the environmental factors, both soil organic carbon and annual precipitation were the most important factors affecting TSN in the 0-20 cm layers. In the 20-40 cm soil layer, TSN was most affected by soil organic carbon.
中文关键词	阿拉善 ; 海拔梯度 ; 草地 ; 土壤全氮 ; 影响因素
英文关键词	Alxa elevation gradient grassland total soil nitrogen effect factor
语种	中文
国家	中国
收录类别	CSCD
WOS类目	AGRICULTURE MULTIDISCIPLINARY
WOS研究方向	Agriculture
CSCD记录号	CSCD:2191998
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/2XILL650/205967
作者单位	兰州大学草地农业科技学院, 农业部草地农业系统学重点开放实验室, 兰州, 甘肃 730020, 中国
推荐引用方式 GB/T 7714	傅华,裴世芳,张洪荣. 贺兰山西坡不同海拔梯度草地土壤氮特征[J]. 兰州大学,2005,14(6):50-56.
APA	傅华,裴世芳,&张洪荣.(2005).贺兰山西坡不同海拔梯度草地土壤氮特征.草业学报,14(6),50-56.
MLA	傅华,et al."贺兰山西坡不同海拔梯度草地土壤氮特征".草业学报 14.6(2005):50-56.