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作者	单位
黄洁1,2, 张扬3, 沈玉芳1, 李世清1	1.西北农林科技大学黄土高原土壤侵蚀与旱地农业国家重点实验室，陕西杨凌 712100； 2. 西北农林科技大学林学院，陕西杨凌 712100； 3.天水师范学院生命科学与化学学院，甘肃天水 741001

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中文摘要:

为了解水分胁迫下施肥对冬小麦根系提水及养分利用的影响以及水肥在小麦生长过程中的协同效应，采用两室分根土培方法，通过对上下两个土层（上层：0~20 cm；下层：20~60 cm）含水量进行控制和观测，分析了不同水分处理间小麦根系提水量、养分积累和表现利用率的差异。结果表明，在土壤上干下湿（DW）条件下冬小麦系提水作用明显，施肥处理对冬小麦全生育期根系提水量有明显影响，表现为氮磷配施、单施磷>对照（不施肥）>单施氮。在氮磷配施条件下，小麦植株及各器官氮磷养分累积量高于其他施肥处理（单施磷、对照和单施氮），各施肥条件下植株氮磷素累积量均表现为WW>DW>DD。氮磷肥表观利用率明显高于单施氮或单施磷处理，且表现出DW和WW（上下土层均湿润）处理的氮磷肥表观利用率均高于DD水分处理（上下土层均干燥）。由此可见，氮磷配施可明显提高水分胁迫（DW）下小麦根系从土壤深层的提水作用，同时促进植株对氮磷养分的积累和利用，实现水肥相互协同。

英文摘要:

In order to study the effects of fertilizer treatments on hydraulic lift of root system and nutrient use efficiency of winter wheat under water stress,root systems were grown in two soil compartments with an upper soil layer (0~20 cm) and a deeper soil layer (20~60 cm).The soil moisture in upper and deeper layers was determined during wheat growing season. The results show that: 1) There was a distinct function of hydraulic lift for winter wheat during the whole growth period under topsoil dry and subsoil wet (DW) treatment,the effect of fertilization on root hydraulic lift followed this order: NP，P>CK>N. 2) Compared with other treatments, NP treatment had a higher nitrogen and phosphorus accumulation for wheat plant and different organs. 3) Apparent N and P recovery of NP treatment was higher than that of N treatment; compared to DD treatment, DW and WW treatments had higher apparent N and P recovery under various nitrogen and phosphorus proportions. Thus, P application could promote the hydraulic lift of root system of winter wheat from deeper soil,the nitrogen and phosphorus accumulation could be increased under various nitrogen and phosphorus proportions and improved soil moisture status,finally,the apparent N and P recovery would be improved.

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