Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1002/2016JG003545 |
Biophysical controls over concentration and depth distribution of soil organic carbon and nitrogen in desert playas | |
McKenna, Owen P.1; Sala, Osvaldo E.1,2 | |
通讯作者 | McKenna, Owen P. |
来源期刊 | JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES |
ISSN | 2169-8953 |
EISSN | 2169-8961 |
出版年 | 2016 |
卷号 | 121期号:12页码:3019-3029 |
英文摘要 | Playa wetlands are important areas of soil organic carbon and nutrient storage in drylands. We conducted this study to assess how catchment biophysical variables control soil organic carbon and nitrogen in playas and how playas function differently than upland ecosystems. We found that playa organic carbon and nitrogen corresponded primarily with catchment vegetation cover and secondarily with catchment area, slope, and soil texture. The effect of increased organic matter production associated with high catchment vegetation cover overshadowed the potential effect of reduced run-on. We also found soil carbon and nitrogen profiles to be significantly shallower in playas than uplands. This trend is correlated with evidence of sedimentation and shallow-rooted plants in playas. Upland soils had a deeper carbon and nitrogen profile, which correlated with organic matter being generated by deeply rooted vegetation. In playas, C:N ratios remained constant through depth but in uplands, C:N ratios increased through depth. We found evidence that differences in rooting depth distributions and soil texture may explain these C:N variations between uplands and playas. In uplands, clay concentration increased with depth, whereas in playas, clay concentration did not change with depth, which highlighted the important role of sedimentation in these ecosystems. Our results suggest that small changes in playa catchment vegetation cover in response to climate change or grazing intensity would greatly impact playa soil organic carbon and nitrogen stocks. This effect would be due to the playa soils dependence on allochthonous organic matter and the large upland area that drains into playas. |
类型 | Article |
语种 | 英语 |
国家 | USA |
收录类别 | SCI-E |
WOS记录号 | WOS:000393134800008 |
WOS关键词 | CHIHUAHUAN DESERT ; CLIMATE-CHANGE ; VEGETATION ; ECOSYSTEMS ; PATTERNS ; RUNOFF ; DESERTIFICATION ; SEDIMENT ; WETLANDS ; WILL |
WOS类目 | Environmental Sciences ; Geosciences, Multidisciplinary |
WOS研究方向 | Environmental Sciences & Ecology ; Geology |
来源机构 | Arizona State University |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/194476 |
作者单位 | 1.Arizona State Univ, Sch Life Sci, Tempe, AZ 85287 USA; 2.Arizona State Univ, Sch Sustainabil, Tempe, AZ USA |
推荐引用方式 GB/T 7714 | McKenna, Owen P.,Sala, Osvaldo E.. Biophysical controls over concentration and depth distribution of soil organic carbon and nitrogen in desert playas[J]. Arizona State University,2016,121(12):3019-3029. |
APA | McKenna, Owen P.,&Sala, Osvaldo E..(2016).Biophysical controls over concentration and depth distribution of soil organic carbon and nitrogen in desert playas.JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES,121(12),3019-3029. |
MLA | McKenna, Owen P.,et al."Biophysical controls over concentration and depth distribution of soil organic carbon and nitrogen in desert playas".JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES 121.12(2016):3019-3029. |
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