不同刈割时间对南北疆油莎豆根际土壤养分和盐基离子含量的影响

Effects of different mowing time on rhizosphere soilnutrients and salt-based ions of Cyperus esculentusin northern and southern Xinjiang

摘要:

【目的】 探究不同刈割时间对南北疆油莎豆（Cyperus esculentus）根际土壤养分和盐基离子的影响。【方法】 2021 年5 月15 日在南疆莎车县北疆阜康市种植油莎豆，分别于播种后第78、91、106 和124 天采集油莎豆根际土壤样品进行养分和盐基离子分析测定。【结果】 采样点和刈割时间显著影响了油莎豆根际土壤的pH（P＜0. 05）；采样点和刈割时间的交互作用显著影响了油莎豆根际土壤的pH、全氮、全磷和全钾含量（P＜0. 05），对油莎豆根际土壤的离子含量均没有显著影响。北疆油莎豆根际土壤的全氮、全钾、速效磷和速效钾含量显著高于南疆（P＜0. 05），但北疆的阳离子（钠离子、钾离子、钙离子和镁离子）含量显著低于南疆（P＜0. 05）。在北疆地区，油莎豆根际土壤的pH 与速效钾和氯离子含量呈显著负相关关系（P＜0. 05），与碳酸氢根离子含量呈显著正相关关系（P＜0. 05）。在南疆地区，油莎豆根际土壤的pH 与速效钾含量呈显著负相关关系（P＜0. 05），与氯离子和钠离子含量呈正相关关系。【结论】 刈割改变了南北疆种植油莎豆根际土壤全钾、速效钾和速效磷含量及pH 值，改变了北疆油莎豆根际土壤氯离子含量，但刈割时间和采样点（北疆）的交互作用对土壤全氮和全磷的影响最大，为实际生产中在新疆区域推广种植油莎豆提供理论依据。

Abstract:

【Objective】 The investigation was performed to explore the effects of different mowing time on rhizo-sphere soil nutrients a salt-based ions of Cyperus esculentus in northern and southern Xinjiang.【Method】 C. esculen-tus was planted in Shache City of southern and Fukang City of northern Xinjiang on May 15，2021. The rhizospheresoil samples were collected on 78，91，106，124 days after seed sowing. The rhizosphere soil nutrients and salt-basedions were analyzed.【Result】 The sampling site and mowing time had significant effects on soil pH （P＜0. 05）. Theirinteraction had significant effects on soil pH，TN，TP，and TK（ P＜0. 05），but had no effects on soil ion content（ P＞0. 05）. The contents of TN，TK，AP，and AK in rhizosphere soil of northern Xinjiang were significantly higher thanthose in rhizosphere soil of southern Xinjiang （P＜0. 05），but the contents of cations （Na+，K+，Ca²+，and Mg²+） inrhizosphere soil of northern Xinjiang were significantly lower than those in rhizosphere soil of southern Xinjiang （P＜0. 05）. In northern Xinjiang，the pH was negatively correlated with the contents of AK and Cl-（ P＜0. 05），and posi-tively correlated with the content of HCO₃- （P＜0. 05）. In southern Xinjiang，the pH was negatively correlated withthe content of AK （P＜ 0. 05），and positively correlated with the contents of Na+and Cl- .【Conclusion】 Mowingtime changed the contents of TK，AK，and AP and pH value in the rhizosphere soil of southern and northern Xinjiang，and changed the content of Cl-in the rhizosphere soil of northern Xinjiang. The interaction between mowing time andsampling site （northern Xinjiang） had the greatest effect on soil TN and TP. This study provided a theoretical basisfor the promotion of actual production of C. esculentus in Xinjiang region.