| 引用本文: | 安江龙,马娟娟,张亚雄,等.两种模型分析方法下冬小麦根系吸水深度的对比研究[J].灌溉排水学报,2017,36(11):25-28. |
| AN Jianglong,MA Juanjuan,ZHANG Yaxiong,et al.两种模型分析方法下冬小麦根系吸水深度的对比研究[J].灌溉排水学报,2017,36(11):25-28. |
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| 摘要: |
| 为了研究冬小麦根系吸水深度，应用塑料管土柱法在田间进行冬小麦种植试验，测定了冬小麦越冬期、拔节期、抽穗期、灌浆期和成熟期不同土层深度土壤水稳定同位素值，并应用耦合模型和IsoSource多元线性模型对比分析了水源贡献率。结果表明，冬小麦在越冬期、返青期主要利用0~20 cm土层的土壤水，拔节期主要吸水深度为0~40 cm；抽穗期，基于耦合模型的主要吸水深度为0~40 cm，基于IsoSource多元线性模型的为0~40 cm和80~180 cm；灌浆期，基于耦合模型和IsoSource多元线性模型的主要不同吸水深度为180~200 cm，且基于耦合模型的该层贡献率明显高于IsoSource多元线性模型；成熟期主要利用0~40 cm和80~100 cm土层的土壤水，基于2种模型的分析结果相同。应用耦合模型求解贡献率，当分组较多且组间水稳定同位素差异较小时，应结合其他方法来保证其准确性。 |
| 关键词: 冬小麦； 吸水深度； 水稳定同位素； 贡献率 |
| DOI：10.13522/j.cnki.ggps.2017.11.005 |
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| Comparative Study of Two Models for Estimating Spatio-temporal Distribution of Water Uptake by Winter Wheat Roots |
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AN Jianglong, MA Juanjuan, ZHANG Yaxiong, LI Rui, SUN Xihuan, GUO Xianghong
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College of Water Resource Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China 。Shanxi Conservancy Technical College, Yuncheng 044004, China
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| Abstract: |
| This paper investigated the spatio-temporal change of water uptake by winter wheat root from soil.The plants were grown in plastic columns, and stable isotope in soil at different depths was measured at wintering, greening, jointing, heading, grain-filling and ripening stages. We then calculated where the roots took up water using coupled-model and the iso-Source multiple linear regression model. The results showed that the winter wheat mainly took water fromthe 0~20 cm of soil during the wintering and greening stages and 0~40 cm of soil during the joining stage. The coupled-model predicted that the plant took water from 0~40 cm of soil at the heading stage, while the regression model told that the water uptake depths were 0~40 cm and 80~100 cm. The difference between the two modelswas the water taken up by roots from 180~200 cm at the filling stage, with the coupled-model overestimating water uptake compared with the regression model. Both models showed that the plant roots took water from 0~40 cm and 80~100 cm of soil at the ripening stage. |
| Key words: winter wheat; water uptake depth; water stable isotope; proportional contribution |
