DOI: 10.1111/gcb.14048
Scopus记录号: 2-s2.0-85041582804
论文题名: Soil phosphorus does not keep pace with soil carbon and nitrogen accumulation following woody encroachment
作者: Zhou Y. ; Boutton T.W. ; Wu X.B.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2018
卷: 24, 期: 5 起始页码: 1992
结束页码: 2007
语种: 英语
英文关键词: landscape scale
; N2 fixation
; soil C-N-P imbalance
; soil profile
; spatial patterns
; structural equation models
; subtropical savanna
; woody encroachment
Scopus关键词: Prosopis glandulosa
英文摘要: Soil carbon, nitrogen, and phosphorus cycles are strongly interlinked and controlled through biological processes, and the phosphorus cycle is further controlled through geochemical processes. In dryland ecosystems, woody encroachment often modifies soil carbon, nitrogen, and phosphorus stores, although it remains unknown if these three elements change proportionally in response to this vegetation change. We evaluated proportional changes and spatial patterns of soil organic carbon (SOC), total nitrogen (TN), and total phosphorus (TP) concentrations following woody encroachment by taking spatially explicit soil cores to a depth of 1.2 m across a subtropical savanna landscape which has undergone encroachment by Prosopis glandulosa (an N2 fixer) and other woody species during the past century in southern Texas, USA. SOC and TN were coupled with respect to increasing magnitudes and spatial patterns throughout the soil profile following woody encroachment, while TP increased slower than SOC and TN in topmost surface soils (0–5 cm) but faster in subsurface soils (15–120 cm). Spatial patterns of TP strongly resembled those of vegetation cover throughout the soil profile, but differed from those of SOC and TN, especially in subsurface soils. The encroachment of woody species dominated by N2-fixing trees into this P-limited ecosystem resulted in the accumulation of proportionally less soil P compared to C and N in surface soils; however, proportionally more P accrued in deeper portions of the soil profile beneath woody patches where alkaline soil pH and high carbonate concentrations would favor precipitation of P as relatively insoluble calcium phosphates. This imbalanced relationship highlights that the relative importance of biotic vs. abiotic mechanisms controlling C and N vs. P accumulation following vegetation change may vary with depth. Our findings suggest that efforts to incorporate effects of land cover changes into coupled climate–biogeochemical models should attempt to represent C-N-P imbalances that may arise following vegetation change. © 2018 John Wiley & Sons Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/110430
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
There are no files associated with this item.
作者单位: Department of Ecosystem Science and Management, Texas A&M University, College Station, TX, United States
Recommended Citation:
Zhou Y.,Boutton T.W.,Wu X.B.. Soil phosphorus does not keep pace with soil carbon and nitrogen accumulation following woody encroachment[J]. Global Change Biology,2018-01-01,24(5)