中国地理科学 ›› 2017, Vol. 27 ›› Issue (4): 507-515.doi: 10.1007/s11769-017-0884-8

• 论文 •    下一篇

Scaling of Soil Carbon, Nitrogen, Phosphorus and C:N:P Ratio Patterns in Peatlands of China

ZHANG Zhongsheng, XUE Zhenshan, LYU Xianguo, TONG Shouzheng, JIANG Ming   

  1. Key Laboratory of Wetland Ecology and Environment, Institute of Northeast Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China
  • 收稿日期:2016-07-04 修回日期:2016-10-14 出版日期:2017-08-27 发布日期:2017-06-30
  • 通讯作者: XUE Zhenshan.E-mail:xuezhenshan@iga.ac.cn E-mail:xuezhenshan@iga.ac.cn
  • 基金资助:

    Under the auspices of National Key Research Program of China (No. 2016YFC0500404-5), National Natural Science Foundation of China (No. 41671081, 41471081, 41671087), Foundation of Jilin Province (No. 20140520141JH)

Scaling of Soil Carbon, Nitrogen, Phosphorus and C:N:P Ratio Patterns in Peatlands of China

ZHANG Zhongsheng, XUE Zhenshan, LYU Xianguo, TONG Shouzheng, JIANG Ming   

  1. Key Laboratory of Wetland Ecology and Environment, Institute of Northeast Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China
  • Received:2016-07-04 Revised:2016-10-14 Online:2017-08-27 Published:2017-06-30
  • Contact: XUE Zhenshan.E-mail:xuezhenshan@iga.ac.cn E-mail:xuezhenshan@iga.ac.cn
  • Supported by:

    Under the auspices of National Key Research Program of China (No. 2016YFC0500404-5), National Natural Science Foundation of China (No. 41671081, 41471081, 41671087), Foundation of Jilin Province (No. 20140520141JH)

摘要:

Inspired by the importance of Redfield-type C:N:P ratios in global soils, we looked for analogous patterns in peatlands and aimed at deciphering the potential affecting factors. By analyzing a suite of peatlands soil data (n = 1031), mean soil organic carbon (SOC), total nitrogen (TN) and total phosphorous (TP) contents were 50.51%, 1.45% and 0.13%, respectively, while average C:N, C:P and N:P ratios were 26.72, 1186.00 and 46.58, respectively. C:N ratios showed smaller variations across different vegetation coverage and had less spatial heterogeneity than C:P and N:P ratios. No consistent C:N:P ratio, though with a general value of 1245:47:1, was found for entire peatland soils in China. The Northeast China, Tibet, Zoigê Plateau and parts of Xinjiang had high soil SOC, TN, TP, and C:P ratio. Qinghai, parts of the lower reaches of the Yangtze River, and the coast zones have low TP and N:P ratio. Significant differences for SOC, TN, TP, C:N, C:P and N:P ratios were observed across groups categorized by predominant vegetation. Moisture, temperature and precipitation all closely related to SOC, TN, TP and their pairwise ratios. The hydrothermal coefficient (RH), defined as annual average precipitation divided by temperature, positively and significantly related to C:N, C:P and N:P ratios, implying that ongoing climate change may prejudice peatlands as carbon sinks during the past 50 years in China.

关键词: peatlands, C:N:P ratio, stoichiometry, climate change

Abstract:

Inspired by the importance of Redfield-type C:N:P ratios in global soils, we looked for analogous patterns in peatlands and aimed at deciphering the potential affecting factors. By analyzing a suite of peatlands soil data (n = 1031), mean soil organic carbon (SOC), total nitrogen (TN) and total phosphorous (TP) contents were 50.51%, 1.45% and 0.13%, respectively, while average C:N, C:P and N:P ratios were 26.72, 1186.00 and 46.58, respectively. C:N ratios showed smaller variations across different vegetation coverage and had less spatial heterogeneity than C:P and N:P ratios. No consistent C:N:P ratio, though with a general value of 1245:47:1, was found for entire peatland soils in China. The Northeast China, Tibet, Zoigê Plateau and parts of Xinjiang had high soil SOC, TN, TP, and C:P ratio. Qinghai, parts of the lower reaches of the Yangtze River, and the coast zones have low TP and N:P ratio. Significant differences for SOC, TN, TP, C:N, C:P and N:P ratios were observed across groups categorized by predominant vegetation. Moisture, temperature and precipitation all closely related to SOC, TN, TP and their pairwise ratios. The hydrothermal coefficient (RH), defined as annual average precipitation divided by temperature, positively and significantly related to C:N, C:P and N:P ratios, implying that ongoing climate change may prejudice peatlands as carbon sinks during the past 50 years in China.

Key words: peatlands, C:N:P ratio, stoichiometry, climate change