摘要
改良盐碱化土壤是当前亟待解决的环境问题,合理选用土壤改良剂和改良方法对盐碱地的开发利用有重要意义。本研究以兰州新区的盐碱土为盆栽土进行盆栽种植草地早熟禾(Poa pratensis)试验,设有底层衬膜施加不同土壤改良剂的10个处理、底层衬膜不施加土壤改良剂和不衬膜施加1号改良剂。通过测定施加改良剂前土壤的基本理化性质及施加土壤改良剂后土壤p H、全盐量及草地早熟禾的生长指标,对不同的土壤改良剂的效果进行分析对比,选择出最有效的土壤改良剂和改良方法。结果表明,施加土壤改良剂后土壤的p H和全盐量低于施加前,草地早熟禾的高度、密度和盖度优于没有添加改良剂的处理。所选10种盐碱改良剂中,嗜盐碱微生物菌肥改良剂效果最好,改良后土壤p H和全盐量分别为7.37和0.28%,比改良前分别降低了1.09和0.32%,草地早熟禾的高度、密度、盖度及叶绿素含量分别为9.68 cm、2.09株·cm^(-2)、99%、3.13 mg·g^(-1),改良效果优于无机改良剂和有机肥。土壤底层衬膜对盐碱土的改良效果优于底层不衬膜处理,衬膜处理下土壤p H、全盐量、草地早熟禾生长密度、高度与不衬膜处理相比差异显著(P<0.05)。
Improvement of salinized soil is necessary for solving current environmental problems, reasonable selection of soil conditioners and improved methods areimportant for the development and utilization of saline-alkali land. We performed pot experiments using heavy saline-alkali soil of Lanzhou New Area. Kentucky blue-grass（Poa pratensis） was subjected to ten treatments consisting of film-bottomed tillage combined with different soil conditioners, film-bottomed tillage without soil conditioners, and the first soil conditioner but without film-bottomed tillage. We measured basic physiochemical properties of soil, including soil pH, before adding the soil conditioners. Total salt contentand growth index of Kentucky bluegrass after applying soil conditioners were measured in order to compare the effect of different soil conditioners, and choose the most effective soil conditioner and soil improvement method. The results revealed that after applying soil conditioners, the soil pH and total salt content were lower and the height, density, and coverage of Kentucky bluegrass were better than that in the treatment without soil conditioners. The most effective soil conditioner of all the selected conditioners was the first soil conditioner. After applying soil conditioners, the soil pH and total salt content were 7.37 and 0.28%, respectively, with a reduction of 1.09 and 0.32%. The height, density, and coverage of Kentucky bluegrass and Lawn chlorophyll content were 9.68 cm, 2.09 plant · cm^-2, 99%, 3.13 mg·g^-1. The first soil conditioner was more suitable than inorganic amendmen to rorganic fertilizer addition. Film-bottomed tillage was better than the no film-bottomed tillage treatment. The soil pH and total salt content, and the height and-density of Kentucky bluegrass of film-bottomed tillage treatment were significantly different from that in the treatment with no film-bottomed tillage.
出处
《草业科学》
CAS
CSCD
北大核心
2017年第6期1141-1148,共8页
Pratacultural Science
基金
兰州市科技计划项目--秦王川盐碱地改良与园林绿化技术研究与示范(2013-1-145)
关键词
盐碱地
土壤改良剂
全盐量
草地早熟禾
衬膜
生物菌肥
生长状况
saline-alkali soil
soil conditioners
total salt content
Kentucky bluegrass
film-bottomed tillage
biological fertilizer
growth index
