Effects of Water Regimes on Soil Nitrogen Dynamics in Tea Garden in Shandong Province

YU Shuhua; ZHANG Lixia; XIE Xueying; HAN Xiaoyang

doi:10.13870/j.cnki.stbcxb.2021.04.040

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Effects of Water Regimes on Soil Nitrogen Dynamics in Tea Garden in Shandong Province

更新时间：2025-03-12

- Effects of Water Regimes on Soil Nitrogen Dynamics in Tea Garden in Shandong Province
- Vol. 35, Issue 4, Pages: 289-298(2021)
- 作者机构：
  
  1. 山东农业大学园艺科学与工程学院,山东,泰安,271018
  2. 作物生物学国家重点实验室,山东,泰安,271018
  3. 齐鲁工业大学生态研究所, 应用微生物学山东省重点实验室,济南,250000
- 作者简介：
- 基金信息：
- DOI：10.13870/j.cnki.stbcxb.2021.04.040
  CLC： S152.7;S571.1
- Published：2021
- 稿件说明：
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YU Shuhua, ZHANG Lixia, XIE Xueying, et al. Effects of Water Regimes on Soil Nitrogen Dynamics in Tea Garden in Shandong Province[J]. 2021, 35(4): 289-298.
DOI：

YU Shuhua, ZHANG Lixia, XIE Xueying, et al. Effects of Water Regimes on Soil Nitrogen Dynamics in Tea Garden in Shandong Province[J]. 2021, 35(4): 289-298. DOI： 10.13870/j.cnki.stbcxb.2021.04.040.

摘要

以山东茶园土壤为研究对象，采用室内好气培养法，分析了恒定湿润和干湿交替模式下土壤氮素转化特征。结果表明：（1）至培养结束时，恒湿模式下60%WHC处理土壤净矿化量和净硝化量较高；脲酶和亚硝酸还原酶活性较强。20%WHC处理下土壤净矿化速率、净硝化速率严重受到抑制。（2）干湿交替模式下复水后土壤净矿化量、净硝化量以及酶活性得到增强，并出现"脉冲"式变化。（3）2种模式下氮素损失均为N2O排放量大于NH3挥发量。N2O排放量与土壤含水量呈正比，NH3挥发量与土壤含水量呈反比。干湿交替均增强土壤N2O和NH3排放量。（4）结构方程模型（SEM）揭示土壤含水量通过直接或间接作用影响土壤氮素转化（p<0.001），脲酶显著影响恒湿模式下土壤氮素转化（p<0.001），而亚硝酸还原酶在2种模式下均显著负影响氮素转化（p<0.001）。研究结果有助于更好地调节茶园生态系统中土壤管理及氮肥的使用。

Abstract

In this study

the characteristics of nitrogen transformation in tea garden soil of Shandong Province were analyzed by indoor aerobic culture. Soil N transformation and enzymes activities in constant wet and dry/wet cycle conditions were measured. The results showed that: (1) The net mineralization quantity and net nitrification quantity

the activities of urease and nitrite reductase were the highest in the 60%WHC treatment at the end of incubation. The net mineralization and net nitrification rates were seriously inhibited in 20%WHC treatment. (2) In dry/wet cycle treatment

net mineralization quantity

net nitrification quantity and enzymes activities increased and the change of "pulse" pattern appeared. (3) N2O emission was greater than NH3 volatilization in both models. N2O emission was directly proportional to soil water content

while NH3 volatilization was inversely proportional. Dry wet alternation enhanced N2O and NH3 emissions. (4) The structural equation model revealed that soil water content affected soil N transformation (p<0.001); urease significantly improved soil N transformation in constant wet treatment (p<0.001)

while nitrate reductase inhibited N transformation (p<0.001) in constant wet and dry/wet cycle models. These results might help to better regulate soil management and the use of N fertilizer in the tea garden ecosystem under different water supply conditions.

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Keywords

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