The role of topography in shaping the spatial patterns of soil organic carbon
文献类型：期刊论文
| 作者 | Zhu, Meng1,2; Feng, Qi1; Qin, Yanyan1,3; Cao, Jianjun4; Zhang, Mengxu1,2; Liu, Wei1; Deo, Ravinesh C.5,6; Zhang, Chengqi1; Li, Ruolin1; Li, Baofeng1 |
| 刊名 | CATENA
 |
| 出版日期 | 2019-05-01 |
| 卷号 | 176页码:296-305 |
| 关键词 | Soil organic carbon Elevation Aspect Vegetation type Structural equation modelling |
| ISSN号 | 0341-8162 |
| DOI | 10.1016/j.catena.2019.01.029 |
| 通讯作者 | Feng, Qi(qifeng@lzb.ac.cn) |
| 英文摘要 | In regions with a relatively complex topography, the soil organic carbon (SOC) is characterized by a high spatial heterogeneity, which is likely to contribute to large uncertainties in the regional SOC estimation. Generally, the elevation and aspect are expected to be the two main topographic controls of the spatial patterns of SOC on steep hillslopes. However, the manner in which the aspect-induced variability in SOC varies with elevation zone is still less understood. In this study, SOC in three elevation-dependent vegetation zones (similar to 2450 m: the shrub-steppe zone, similar to 2900 in: the forest-steppe zone, and similar to 3350 m: the shrub-meadow zone) was examined in the Qilian Mountains. Soil samples at 0-10, 10-20, 20-40, and 40-60 cm were collected on the south-, southwest-, west-, northwest-, and north-facing slopes with similar slope gradients (similar to 32 degrees) in each of the three vegetation zones. The results showed that the SOC density tends to increase following the elevation zone, with an average density of about 24.30 kg m(-2) at the 0-60 cm. In addition, the SOC concentration appeared to have increased with the cosine of the aspect following an exponential function. The average rate of increase in terms of the aspect at 0-10 cm in the forest-steppe zone was approximately 0.46 g kg(-1) degree(-1), which amounted to 1.39 and 2.19 fold greater than in the shrub-steppe and shrub-meadow zones, respectively. Path analysis performed using structural equation modelling (SEM) demonstrated that the elevation and the aspect had an indirect influence on the SOC density, through a direct effect on the soil temperature, vegetation type, and soil moisture, and this could possibly explain 88% of the total variation in the SOC density. The present results suggest that the forest-steppe zone is characterized by the strongest aspect effect on SOC in comparison with the shrub-steppe and shrub-meadow zones, and confirm the importance of elevation and aspect in shaping the spatial patterns of SOC. |
| 收录类别 | SCI |
| WOS关键词 | HEIHE RIVER-BASIN ; LAND-USE CHANGE ; QILIAN MOUNTAINS ; SLOPE ASPECT ; ENVIRONMENTAL CONTROLS ; ALTITUDINAL GRADIENT ; NITROGEN STOCKS ; LOESS PLATEAU ; FOREST SOILS ; CLIMATE |
| WOS研究方向 | Geology ; Agriculture ; Water Resources |
| WOS类目 | Geosciences, Multidisciplinary ; Soil Science ; Water Resources |
| 语种 | 英语 |
| WOS记录号 | WOS:000462107000024 |
| 出版者 | ELSEVIER SCIENCE BV |
| URI标识 | http://www.irgrid.ac.cn/handle/1471x/2555521 |
| 专题 | 寒区旱区环境与工程研究所 |
| 通讯作者 | Feng, Qi |
| 作者单位 | 1.Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Key Lab Ecohydrol Inland River Basin, Lanzhou 730000, Gansu, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Key Lab Land Surface Proc & Climate Change Cold &, Lanzhou 730000, Gansu, Peoples R China 4.Northwest Normal Univ, Coll Geog & Environm Sci, Lanzhou 730070, Gansu, Peoples R China 5.Univ Southern Queensland, Ctr Sustainable Agr Syst, Inst Life Sci & Environm, Sch Agr Computat & Environm Sci, Springfield, Qld 4300, Australia 6.Univ Southern Queensland, Ctr Appl Climate Sci, Sch Agr Computat & Environm Sci, Inst Life Sci & Environm, Springfield, Qld 4300, Australia |
| 推荐引用方式 GB/T 7714 | Zhu, Meng,Feng, Qi,Qin, Yanyan,et al. The role of topography in shaping the spatial patterns of soil organic carbon[J]. CATENA,2019,176:296-305. |
| APA | Zhu, Meng.,Feng, Qi.,Qin, Yanyan.,Cao, Jianjun.,Zhang, Mengxu.,...&Li, Baofeng.(2019).The role of topography in shaping the spatial patterns of soil organic carbon.CATENA,176,296-305. |
| MLA | Zhu, Meng,et al."The role of topography in shaping the spatial patterns of soil organic carbon".CATENA 176(2019):296-305. |
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来源：寒区旱区环境与工程研究所
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