DOI: 10.1007/s10533-016-0235-3
Scopus记录号: 2-s2.0-84982306777
论文题名: Rapid recuperation of soil nitrogen following agricultural abandonment in a karst area, southwest China
作者: Wen L. ; Li D. ; Yang L. ; Luo P. ; Chen H. ; Xiao K. ; Song T. ; Zhang W. ; He X. ; Chen H. ; Wang K.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2016
卷: 129, 期: 3 起始页码: 341
结束页码: 354
语种: 英语
英文关键词: Ecological restoration
; Karst area
; N accumulation
; N dynamics
; Post-agriculture succession
; Soil N stock
Scopus关键词: abandoned land
; atmospheric deposition
; calcareous soil
; carbon sequestration
; concentration (composition)
; environmental restoration
; grassland soil
; karst
; mineralization
; nitrogen cycle
; nitrogen fixation
; nutrient dynamics
; secondary succession
; soil nitrogen
; subtropical region
; China
英文摘要: Soil nitrogen (N) dynamics are crucial for ecosystem development and carbon sequestration. However, N dynamics during post-agriculture succession have not been well understood. Here soil N dynamics during post-agriculture succession were investigated in a subtropical karst area, southwest China. The succession sequence includes grassland (~10 years), shrubland (~29 years), secondary forest (~59 years) and primary forest with cropland as reference. The soil is calcareous lithosols. Soil N stock (0–15 cm) in the cropland (335.2 ± 55.1 g N m−2) was not significantly different from that in the grassland, but was elevated by 120 to 221 % in the later three succession stages. Across the sequence, soil N accumulated with an average rate of 12.4 g N m−2 yr−1. Soil N stock recovered to the primary forest level in about 67 years following agricultural abandonment. NO3 − concentrations increased while NH4 + concentrations decreased with years following agricultural abandonment. High NO3 − concentrations (66.5–120.9 mg N kg−1) may imply N saturation in the shrubland, secondary forest and primary forest. Rates of net N mineralization and nitrification increased with succession. δ15N of soil, leaves and litter was significantly elevated in the later three succession stages relative to the grassland, indicating that the N cycle became more open with succession. N release from bedrock weathering was likely a potential N source in addition to atmospheric N deposition and biological N fixation. Our study suggests that N would not be the limiting nutrient for secondary succession and ecological restoration in the karst region of southwest China. © 2016, Springer International Publishing Switzerland. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83363
Appears in Collections: 气候减缓与适应 气候变化事实与影响
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作者单位: Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, 644 Yuanda 2nd Road, Changsha, Hunan, China; Huanjiang Observation and Research Station for Karst Ecosystems, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Huangjiang, Guangxi, China; University of Chinese Academy of Sciences, Beijing, China
Recommended Citation:
Wen L.,Li D.,Yang L.,et al. Rapid recuperation of soil nitrogen following agricultural abandonment in a karst area, southwest China[J]. Biogeochemistry,2016-01-01,129(3)