干旱区生态环境知识资源中心(Arid): Patterns of Soil ~(15)N and Total N and Their Relationships with Environmental Factors on the Qinghai-Tibetan Plateau

Arid

DOI	10.1016/S1002-0160(14)60009-6
	Patterns of Soil ~(15)N and Total N and Their Relationships with Environmental Factors on the Qinghai-Tibetan Plateau
	Zhou Lei; Song Minghua; Wang Shaoqiang; Fan Jiangwen; Liu Jiyuan; Zhong Huaping; Yu Guirui; Gao Lupeng; Hu Zhongmin; Chen Bin; Wu Weixing; Song Ting
来源期刊	Pedosphere
ISSN	1002-0160
出版年	2014
卷号	24 期号:2 页码:232-242
英文摘要	The patterns of soil nitrogen (N) isotope composition at large spatial and temporal scales and their relationships to environmental factors illustrate N cycle and sources of N, and are integrative indicators of the terrestrial N cycle and its response to global change. The objectives of this study were: i) to investigate the patterns of soil N content and natural abundance of ~(15)N (delta~(15)N) values in different ecosystem types and soil profiles on the Qinghai-Tibetan Plateau; ii) to examine the effects of climatic factors and soil characteristics on the patterns of soil N content and soil delta~(15)N values; and iii) to test the relationship between soil delta~(15)N values and soil C/N ratios across ecosystems and soil profiles. Soil profiles were sampled at 51 sites along two transects 1 875 km in length and 200 km apart and distributed in forest, meadow and steppe on the Qinghai-Tibetan Plateau. Each site was sampled every 10 cm from a soil depth of 0 to 40 cm and each sample was analyzed for soil N content and delta~(15)N values. Our results indicated that soil N and delta~(15)N values (0-40 cm) in meadows were much higher than in desert steppe. Soil N decreased with soil depth for each ecosystem, while variations of soil delta~(15)N values along soil profiles were not statistically significant among most ecosystems but for mountain meadow, lowland meadow, and temperate steppe where soil delta~(15)N values tended to increase with soil depth. The parabolic relationship between soil delta~(15)N values and mean annual precipitation indicated that soil delta~(15)N values increased with increasing precipitation in desert steppe up to 500 mm, and then decreased with increasing precipitation across all other ecosystems. Moreover, the parabolic relationship between delta~(15)N values and mean annual temperature existed in all individual ecosystem types. Soil N and delta~(15)N values (0-40 cm) increased with an increase in soil silt and clay contents. Furthermore, a threshold of C/N ratio of about 11 divided the parabolic relationship between soil delta~(15)N values and soil C/N ratios into positive (C/N < 11) and negative (C/N > 11) parts, which was valid across all ecosystems and soil profiles. The large explanatory power of soil C/N ratios for soil delta~(15)N values suggested that C and N concentrations, being strongly controlled by precipitation and temperature, were the primary factors determining patterns of soil delta~(15)N on the Qinghai-Tibetan Plateau.
英文关键词	desert steppe nitrogen isotope composition nutrient availability soil nitrogen
类型	Article
语种	英语
收录类别	CSCD
WOS研究方向	Science & Technology - Other Topics
CSCD记录号	CSCD:5111193
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/335339
作者单位	Zhou Lei, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Key Laboratory of Ecosystem Network Observation and Modelling, Chinese Academy of Sciences, Beijing 100101, China.; Song Minghua, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Key Laboratory of Ecosystem Network Observation and Modelling, Chinese Academy of Sciences, Beijing 100101, China.; Wang Shaoqiang, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Key Laboratory of Ecosystem Network Observation and Modelling, Chinese Academy of Sciences, Beijing 100101, China.; Fan Jiangwen, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Key Laboratory of Ecosystem Network Observation and Modelling, Chinese Academy of Sciences, Beijing 100101, China.; Liu Jiyuan, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Key Laboratory of Ec...
推荐引用方式 GB/T 7714	Zhou Lei,Song Minghua,Wang Shaoqiang,et al. Patterns of Soil ~(15)N and Total N and Their Relationships with Environmental Factors on the Qinghai-Tibetan Plateau[J],2014,24(2):232-242.
APA	Zhou Lei.,Song Minghua.,Wang Shaoqiang.,Fan Jiangwen.,Liu Jiyuan.,...&Song Ting.(2014).Patterns of Soil ~(15)N and Total N and Their Relationships with Environmental Factors on the Qinghai-Tibetan Plateau.Pedosphere,24(2),232-242.
MLA	Zhou Lei,et al."Patterns of Soil ~(15)N and Total N and Their Relationships with Environmental Factors on the Qinghai-Tibetan Plateau".Pedosphere 24.2(2014):232-242.