土壤改良剂对盐碱土性质及草地早熟禾生理生长特性的影响

Effects of soil amendments on saline-alkali soil properties and physiological growth of kentucky bluegrass

摘要:

【目的】 筛选适合兰州新区盐碱地的土壤改良剂，对提高兰州新区绿化的丰富度和景观效果具有重要意义。【方法】 选取甘肃财贸职业学院内一处绿化用地为试验地，采用盆栽试验分析5种土壤改良剂组合在草地早熟禾种植前后对土壤理化性质的影响及草地早熟禾生理生长指标的影响。 【结果】 5种土壤改良剂组合均降低了土壤pH值、全盐含量，指示植物的出苗数、叶绿素含量、高度、叶宽、盖度均显著高于对照（P＜0.05）。4种改良剂（处理2除外）降低了植物中丙二醛的含量，增加了土壤中有机质、水解氮和有效磷的含量及草地早熟禾叶片中过氧化物酶、过氧化氢酶、超氧化物歧化酶的活性。【结论】 5种盐碱改良剂以“3 750 kg/hm2腐殖酸+13 500 kg/hm2有机肥”组合效果最好，改良后土壤pH值、全盐含量分别为7.43、0.31%，比改良前分别降低了0.88、0.32%，与CK相比，土壤pH值、全盐含量分别由8.14、0.56%降低为0.71、0.25%，改良效果优于其他土壤改良剂。

Abstract:

【Objective】 In order to screen out soil amendments suitable for saline-alkali land in Lanzhou New District，this study is of great significance for improving the richness and landscape effect of greening in Lanzhou New District.【Method】 A green land in Gansu Vocational College of Finance and Trade was selected as the experimental site. Pot experiment was conducted to analyze the effects of five soil amendments on soil basic physical and chemical properties and the growth indexes of bluegrass before and after planting.【Result】 The five soil amendments reduced soil pH and total salt content，The number of seedling emergence，chlorophyll content，height，leaf width and cover of indicator plants were significantly higher than those of control treatment （P＜0. 05）. Four amendments （except treatment 2） reduced the content of malondialdehyde in plants，increased the contents of organic matter，hydrolyzed nitrogen and available phosphorus in soil，and the activities of peroxidase，catalase and superoxide dismutase in bluegrass leaves.【Conclusion】 The combination of "3 750 kg/hm2 humic acid +13 500 kg/hm2 organic fertilizer" had the best effect among the five selected salt-alkali amendments. The pH and total salt content of soil after the improvement were 7. 43 and 0. 31%，respectively，which decreased by 0. 88 and 0. 32% compared with before the improvement. Compared with CK，soil pH and total salt content decreased from 8. 14 and 0. 56 to 0. 71 and 0. 25%，respectively， and the improvement effect was better than other soil amendments.