Dynamics of water uptake by maize on sloping farmland in a shallow Entisol in Southwest China
文献类型：期刊论文
| 作者 | Zhao, Pei1,2 ; Tang, Xiangyu2; Zhao, Peng3; Tang, Jialiang2
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| 刊名 | CATENA
 |
| 出版日期 | 2016-12-01 |
| 卷号 | 147页码:511-521 |
| 关键词 | Immobile soil water Maize water use Mobile soil water Shallow soil Stable isotopes |
| ISSN号 | 0341-8162 |
| 通讯作者 | Xiangyu Tang |
| 英文摘要 | The water use patterns of maize grown in shallow soils remain poorly understood. To explore the water uptake dynamics of maize from a loamy Entisol with an average thickness of 40 cm, excavation, isotopic tracer analysis and soil water potential measurements were combined to study the source of water used by maize. The differences between the delta D of the water used by maize and the delta D of the mobile soil water (MSW, the fraction of soil water with high mobility which can be easily replaced by the infiltrating rainwater) indicated that maize did not take up much MSW. The local meteoric evaporation line, the delta D of the bulk soil water (BSW, total soil water including mobile and immobile soil water) and the soil water collected using a lysimeter were used in a model to calculate the isotopic compositions of different fractions of soil water and the proportion of immobile soil water (ImSW, the fraction of soil water with little mobility which was tightly bound to the soil particles). ImSW resulted from several heavy rains that occurred before the sampling. The primary water sources for maize varied temporally and spatially. Maize seedlings at the one-leaf stage used ImSW from 0 to 10 cm soil depth; however, maize plants generally used more BSW from deeper soil layers when the roots reached greater depths. The ratios of MSW to ImSW were-not equal between the maize stems and soil, with more ImSW in the maize stems, particularly during the seedling stage. This result invalidates the core concept of most watershed hydrology models and classical hypothesis in the isotopic models of general atmospheric circulation. The difference between the MSW and ImSW in the water cycle of the soil-plant-atmosphere continuum should be considered in the future studies of identifying the plant water sources and modeling hydrological processes. (C) 2016 Elsevier B.V. All rights reserved. |
| WOS标题词 | Science & Technology ; Physical Sciences ; Life Sciences & Biomedicine |
| 类目[WOS] | Geosciences, Multidisciplinary ; Soil Science ; Water Resources |
| 研究领域[WOS] | Geology ; Agriculture ; Water Resources |
| 关键词[WOS] | MIDWESTERN US ; WOODY-PLANTS ; ISOTOPE ; ROOTS ; SOIL ; SYSTEMS ; STREAMS ; GROWTH ; REGION ; DEPTH |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000385598800050 |
| 源URL | [http://ir.imde.ac.cn/handle/131551/18068]  |
| 专题 | 成都山地灾害与环境研究所_山地表生过程与生态调控重点实验室 |
| 作者单位 | 1.Shangluo Univ, Coll Urban Rural Planning & Architectural Engn, Shangluo 726000, Peoples R China 2.Chinese Acad Sci, Inst Mt Hazards & Environm, Key Lab Mt Surface Proc & Ecol Regulat, Chengdu 610041, Peoples R China 3.Sichuan Univ, Coll Water Resource & Hydropower, Chengdu 610065, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhao, Pei,Tang, Xiangyu,Zhao, Peng,et al. Dynamics of water uptake by maize on sloping farmland in a shallow Entisol in Southwest China[J]. CATENA,2016,147:511-521. |
| APA | Zhao, Pei,Tang, Xiangyu,Zhao, Peng,&Tang, Jialiang.(2016).Dynamics of water uptake by maize on sloping farmland in a shallow Entisol in Southwest China.CATENA,147,511-521. |
| MLA | Zhao, Pei,et al."Dynamics of water uptake by maize on sloping farmland in a shallow Entisol in Southwest China".CATENA 147(2016):511-521. |
入库方式： OAI收割
来源：成都山地灾害与环境研究所
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