干旱区研究 ›› 2021, Vol. 38 ›› Issue (5): 1376-1384.doi: 10.13866/j.azr.2021.05.19

• 土壤资源 • 上一篇    下一篇

水分胁迫对设施延迟栽培葡萄根际土壤有机氮及土壤酶活性的影响

杨昌钰1(),张芮1(),蔺宝军2,董博3,高彦婷1,李红霞1,张彩霞1,王喜红1   

  1. 1. 甘肃农业大学水利水电工程学院,甘肃 兰州 730070
    2. 大禹节水集团股份有限公司,甘肃 酒泉 735000
    3. 甘肃省农业科学院,甘肃 兰州 730070
  • 收稿日期:2020-12-23 修回日期:2021-02-21 出版日期:2021-09-15 发布日期:2021-09-24
  • 通讯作者: 张芮
  • 作者简介:杨昌钰(1996-),女,硕士,主要从事节水灌溉与水资源利用研究. E-mail: 402904020@qq.com
  • 基金资助:
    国家自然科学基金项目(51769001);甘肃农业大学伏羲青年英才项目(Gaufx-03Y10);甘肃省陇原青年创新创业人才项目(2019-9)

Effects of water stress on rhizosphere organic nitrogen fractions and enzyme activities in the rhizosphere of delayed cultivation grape

YANG Changyu1(),ZHANG Rui1(),LIN Baojun2,DONG Bo3,GAO Yanting1,LI Hongxia1,ZHAGN Caixia1,WANG Xihong1   

  1. 1. College of Water Conservancy and Hydropower Engineering, Gansu Agricultural University, Lanzhou 730070, Gansu, China
    2. Dayu Irrigation Group Co., Ltd., Jiuquan 735000, Gansu, China
    3. Gansu Academy of Agricultural Sciences, Lanzhou 730070, Gansu, China
  • Received:2020-12-23 Revised:2021-02-21 Online:2021-09-15 Published:2021-09-24
  • Contact: Rui ZHANG

摘要:

为探讨不同水分胁迫条件下设施栽培葡萄根际土壤基本理化性质与有机氮组分及土壤酶活性的变化规律,并分析三者之间的相关关系,为甘肃河西地区设施延迟栽培葡萄制定合理的胁迫灌溉模式提供一定的参考依据。采用水分胁迫单因素完全随机试验设计,运用Bremner法测定着色成熟期葡萄根际土层中有机氮组分含量及土壤基本理化性质、全生育期土壤酶活性在不同水分胁迫(中度W1、轻度W2、充分供水W3)下的变化特征。结果表明:(1) 全生育期中度和轻度水分胁迫对设施延迟栽培葡萄根际土壤全氮、铵态氮、全磷、有机质以及有机碳无显著影响,却降低了葡萄根际土壤微生物生物量碳、氮含量;新梢生长期和果实膨大期土壤硝态氮和速效磷含量分别为12.06 mg·kg-1和28.88 mg·kg-1,显著低于充分供水处理。(2) 中度和轻度水分胁迫对葡萄全生育期根际土壤过氧化氢酶活性无显著性影响,而对果实膨大期和着色成熟期的脲酶、蔗糖酶含量均呈现不同程度的抑制效果。(3) 各处理有机氮组分的含量大小顺序为非酸解态氮>酸解氨基酸态氮>酸解铵态氮>酸解未知态氮>酸解氨基糖态氮;轻度和中度水分胁迫均有助于葡萄根际土壤酸解总氮的积累,比对照分别提高21.16%和10.34%。(4) 相关分析表明,蔗糖酶与生物量碳呈显著正相关;RDA分析显示硝态氮、铵态氮为影响土壤有机氮组分变化的最主要环境因子,全氮次之。

关键词: 水分胁迫, 设施栽培, 理化性质, 土壤酶活性, 有机氮组分

Abstract:

In order to explore the changes in the basic physical and chemical properties, enzyme activities and organic nitrogen components of the rhizosphere soil of protected grapes under different water stress conditions, and analyze the response relationship between them provide a certain reference basis for the establishment of a reasonable stress irrigation model for the delayed cultivation of grapes in the Hexi area of Gansu Province. Using a completely randomized test design based on a single water stress factor, the Bremner method was employed to determine the characteristics of the variation in organic nitrogen contents in the rhizosphere soil layer of the grapes during the ripening period, and the basic physical and chemical properties of the soil and soil enzyme activity during the whole growth period, under different water stresses (moderate W1, mild W2, and adequate W3 water supply). The results showed: (1) Moderate and mild water stress during the whole growth period had no significant effect on the total nitrogen, ammonium nitrogen, total phosphorus, organic matter, and organic carbon of the rhizosphere soil of the grapes under delayed cultivation, but the soil microbial biomass carbonand nitrogen contents were reduced. The contents of soil nitrate nitrogen and available phosphorus in the early stage of water stress were significantly lower than those observed in adequate water supply conditions. (2) Moderate and mild water stress had no significant effect on the activity of catalase in rhizosphere soil during the whole grape growth period, but showed different levels of inhibitory effects on the contents of urease and invertase in the fruit swelling and coloring stages. (3) The contents of organic nitrogen components in each treatment were present in the following order: non-acid hydrolysis nitrogen>acid hydrolysis amino acid nitrogen>acid hydrolysis ammonium nitrogen>acid hydrolysis unknown nitrogen>acid hydrolysis amino sugar nitrogen; both mild and moderate water stress contributed to the accumulation of total acid hydrolyzed nitrogen in the grapes’ rhizosphere soil, which increased by 21.16% and 10.34%, respectively, compared with contrast. (4) Sucrase had a significant and positive correlation with microbial biomass carbon; RDA analysis showed that nitrate nitrogen and ammonium nitrogen were the most important environmental factors affecting the variation of soil organic nitrogen components, followed by total nitrogen.

Key words: water stress, facility cultivation, basic physical and chemical properties, soil enzyme activity, organic nitrogen components