麦稻体系下根区与非根区紫色土锌素动态研究
关键词:
- 麦稻体系 /
- 根区 /
- 锌形态 /
- 转化
摘要: 采用分室根箱试验，研究了小麦—水稻体系条件下紫色土根区与非根区土壤不同形态锌含量变化动态特征，以期为麦稻轮作制中合理施用锌肥及作物锌营养调控提供依据．结果表明，麦稻体系条件下，小麦和水稻生长后期，根区交换态锌含量比对照（不种作物处理）分别增加了0.83和0.59 m g／kg ，与对照相比两者差异均达显著水平．淹水促进了水溶性锌向根区的扩散，非根区交换态锌和有效态锌明显降低．由小麦季过渡到水稻季，促进了土壤中的矿物态锌向有效态锌转化，使土壤中交换态、松结有机态锌含量均高于对照土壤，且随着距离根区越近这种作用越明显．小麦锌吸收主要来自于根区，而对于水稻则可以利用更大范围的土壤有效锌．
A Dynamic Research of Zinc in the Rhizosphere and Non-Rhizosphere Purple Soil in a Wheat-Rice Cropping System
Keywords:
- 麦稻体系 /
- 根区 /
- 锌形态 /
- 转化
Abstract: A compartment test was adopted to study the dynamic variation in the contents of different zinc forms in the rhizosphere and non‐rhizosphere purple soil in a wheat‐rice cropping system ,so as to provide evidence for rational application of zinc fertilizer and crop zinc nutrition regulation in wheat‐rice rotation . The results showed that in the late growing period of wheat and rice in the rotation system ,the exchangea‐ble zinc content in the rhizosphere significantly increased ,by 0.83 mg/kg and 0.59 mg/kg ,respectively , compared with the control (no‐cropping) .Flooding promoted the diffusion of water‐soluble zinc to the root zone ,and the exchangeable zinc and available zinc of the non‐rhizosphere soil were significantly reduced . The transition from the wheat‐growing season to the rice‐growing season promoted the conversion of min‐eral Zn to available zinc and ,thus ,the contents of soil exchangeable Zn ,organic loose bounding Zn and carbonate Zn were higher than those of the control ,which effect was more obvious within the rhizosphere . The zinc absorbed by wheat came mainly from the root zone ,while that taken up by the rice plants might come from a wider range of soil available zinc .
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