Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1111/gcb.14048 |
Soil phosphorus does not keep pace with soil carbon and nitrogen accumulation following woody encroachment | |
Zhou, Yong; Boutton, Thomas W.; Wu, X. Ben | |
2018-05-01 | |
发表期刊 | GLOBAL CHANGE BIOLOGY |
ISSN | 1354-1013 |
EISSN | 1365-2486 |
出版年 | 2018 |
卷号 | 24期号:5页码:1992-2007 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
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 N-2 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 N-2-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. |
英文关键词 | landscape scale N-2 fixation soil C-N-P imbalance soil profile spatial patterns structural equation models subtropical savanna woody encroachment |
领域 | 气候变化 ; 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000428879800014 |
WOS关键词 | N-P STOICHIOMETRY ; ORGANIC-MATTER ; TERRESTRIAL ECOSYSTEMS ; SPATIAL HETEROGENEITY ; SHRUB ENCROACHMENT ; PLANT ENCROACHMENT ; VEGETATION CHANGE ; SAVANNA ; GRASSLAND ; FIXATION |
WOS类目 | Biodiversity Conservation ; Ecology ; Environmental Sciences |
WOS研究方向 | Biodiversity & Conservation ; Environmental Sciences & Ecology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/17203 |
专题 | 气候变化 资源环境科学 |
作者单位 | Texas A&M Univ, Dept Ecosyst Sci & Management, College Stn, TX 77843 USA |
推荐引用方式 GB/T 7714 | Zhou, Yong,Boutton, Thomas W.,Wu, X. Ben. Soil phosphorus does not keep pace with soil carbon and nitrogen accumulation following woody encroachment[J]. GLOBAL CHANGE BIOLOGY,2018,24(5):1992-2007. |
APA | Zhou, Yong,Boutton, Thomas W.,&Wu, X. Ben.(2018).Soil phosphorus does not keep pace with soil carbon and nitrogen accumulation following woody encroachment.GLOBAL CHANGE BIOLOGY,24(5),1992-2007. |
MLA | Zhou, Yong,et al."Soil phosphorus does not keep pace with soil carbon and nitrogen accumulation following woody encroachment".GLOBAL CHANGE BIOLOGY 24.5(2018):1992-2007. |
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