Interaction between contrasting rice genotypes and soil physical conditions induced by hydraulic stresses typical of alternate wetting and drying irrigation of soil.
Interaction between contrasting rice genotypes and soil physical conditions induced by hydraulic stresses typical of alternate wetting and drying irrigation of soil.
复制标题
水稻基因型对比与土壤物理条件之间的相互作用是由土壤干湿交替灌溉典型的水力胁迫引起的
DOI：
10.1007/s11104-018-3715-5
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发表时间：
2018
期刊：
影响因子：
4.9
通讯作者：
Hallett PD
中科院分区：
文献类型：
--
作者：
Fang H;Zhou H;Norton GJ;Price AH;Raffan AC;Mooney SJ;Peng X;Hallett PD
干湿交替在水稻生产中节水，但会影响土壤物理条件和根系生长。本研究探讨了对比水稻基因型，土壤结构和机械阻抗的水力应力典型的AWD. MethodsContrast水稻基因型，IR 64和深根黑戈拉的影响之间的相互作用，在各种土壤条件下生长2周。对于AWD处理，土壤要么保持在水坑状态，平衡到−5 kPa（WET），要么干燥到−50 kPa，然后在−5 kPa的水势下重新湿润（干湿）。还有一个额外的操纵大孔结构处理，即土壤被破碎成团聚体，填充到核心和平衡到−5 kPa（重新包装）。将淹水处理（水坑土壤保持淹水直到收获）设定为对照（淹水）。土壤容重，渗透阻力和X射线计算机断层扫描（CT）衍生的大孔结构进行了测量。总根长，根表面积，根体积，平均直径，和尖端数WinRhizo.ResultsAWD诱导形成的大孔和轻微增加土壤机械阻抗。AWD和REPACKED处理的总根长分别是FLOODED处理的1.7-2.2倍和3.5-4.2倍。湿处理和干湿处理之间没有显著差异。基因型之间的差异是minimal.ConclusionsAWD影响土壤物理性质和水稻幼苗的一些根系特征，但干燥土壤最初到-50 kPa与-5 kPa没有影响。大孔形成有意重新包装造成了很大的变化，根的特性。
Background and aimsAlternate wetting and drying (AWD) saves water in paddy rice production but could influence soil physical conditions and root growth. This study investigated the interaction between contrasting rice genotypes, soil structure and mechanical impedance influenced by hydraulic stresses typical of AWD.MethodsContrasting rice genotypes, IR64 and deeper-rooting Black Gora were grown in various soil conditions for 2 weeks. For the AWD treatments the soil was either maintained in a puddled state, equilibrated to −5 kPa (WET), or dried to −50 kPa and then rewetted at the water potential of −5 kPa (DRY-WET). There was an additional manipulated macropore structure treatment, i.e. the soil was broken into aggregates, packed into cores and equilibrated to −5 kPa (REPACKED). A flooded treatment (puddled soil remained flooded until harvest) was set as a control (FLOODED). Soil bulk density, penetration resistance and X-ray Computed Tomography (CT) derived macropore structure were measured. Total root length, root surface area, root volume, average diameter, and tip number were determined by WinRhizo.ResultsAWD induced formation of macropores and slightly increased soil mechanical impedance. The total root length of the AWD and REPACKED treatments were 1.7–2.2 and 3.5–4.2 times greater than that of the FLOODED treatment. There was no significant difference between WET and DRY-WET treatments. The differences between genotypes were minimal.ConclusionsAWD influenced soil physical properties and some root characteristics of rice seedlings, but drying soil initially to −50 kPa versus −5 kPa had no impact. Macropores formed intentionally from repacking caused a large change in root characteristics.
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影响因子：
6.7
作者：
Bouman, BAM;Peng, S;Visperas, RM
通讯作者：
Visperas, RM
影响因子：
3.1
作者：
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影响因子：
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通讯作者：
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4.9
作者：
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通讯作者：
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9.8
作者：
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通讯作者：
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