Effects of Water and Salt Gradients on Soil Nutrient Indices and Enzyme Activities in Coastal Wetlands

Xian Xuanxuan; KONG Fanlong; Zhu Meike; LI Yue; Xi Min

doi:10.13961/j.cnki.stbctb.2019.01.011

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Effects of Water and Salt Gradients on Soil Nutrient Indices and Enzyme Activities in Coastal Wetlands

- Effects of Water and Salt Gradients on Soil Nutrient Indices and Enzyme Activities in Coastal Wetlands
- Bulletin of Soiland Water Conservation Vol. 39, Issue 1, Pages: 65-71(2019)
- 作者机构：
  
  青岛大学环境科学与工程学院,山东,青岛,266071
- 作者简介：
- 基金信息：
- DOI：10.13961/j.cnki.stbctb.2019.01.011
  CLC：
- Published：2019
- 稿件说明：
移动端阅览
Xian Xuanxuan, KONG Fanlong, Zhu Meike, et al. Effects of Water and Salt Gradients on Soil Nutrient Indices and Enzyme Activities in Coastal Wetlands[J]. Bulletin of Soiland Water Conservation, 2019, 39(1): 65-71.
DOI：

Xian Xuanxuan, KONG Fanlong, Zhu Meike, et al. Effects of Water and Salt Gradients on Soil Nutrient Indices and Enzyme Activities in Coastal Wetlands[J]. Bulletin of Soiland Water Conservation, 2019, 39(1): 65-71. DOI： 10.13961/j.cnki.stbctb.2019.01.011.

摘要

[目的

]

研究海水入侵对滨海湿地土壤性质的影响，为分析水盐梯度对土壤养分指标和酶活性的影响机制提供依据。[方法

]

采集胶州湾滨海湿地表层土壤并设计室内模拟试验，测定不同水盐梯度上的土壤养分指标和酶活性。[结果

]

盐分和水分对土壤pH值和容重（BD）的影响显著；土壤有机质（TOM）、氨氮（NH

-N）、速效磷（AP）、速效钾（AK）、蔗糖酶（SA）、脲酶（UA）、碱性磷酸酶（APA）均随水梯度的增加表现为先升高后降低的趋势，在30%水梯度时达到最高值；土壤TOM，AP，AK，SA，UA，APA均随盐梯度的增加而降低，NH

-N随盐梯度的增加而增加。土壤SA与TOM，AP，AK存在显著正相关关系；APA与TOM，AP，AK，BD显著正相关；UA与pH值，BD显著正相关，与NH

-N具有一定的相关性。[结论

]

在一定范围内，土壤中水分过高或过低、盐分增加均会对土壤养分含量和酶活性产生抑制作用；土壤养分和酶活性之间存在密切的相关关系。

Abstract

[Objective] To analyze the influence mechanism of water and salt contents on soil nutrient and enzymatic activity

in order to provide scientific basis for exploring the effect of seawater intrusion on coastal wetland soil. [Methods] The surface soil of the coastal wetland in Jiaozhou Bay was collected and the simulation experiments were conducted in laboratory to determine the soil nutrient index and enzymatic activity under different water salt gradients. [Results] Soil pH value and bulk density (BD) were significantly affected by salinity and moisture

respectively. With the increase of soil water gradient

the total organic matter (TOM)

ammonium nitrogen (NH4+-N)

available phosphorus (AP)

available potassium (AK)

sucrase activity (SA)

urease activity (UA) and alkaline phosphatase activity (APA) increased initially and then decreased

reaching the maximum value at 30% water gradient. TOM

UA and APA decreased with the increase of soil salinity gradient

while NH4+-N showed an opposite variation trend. The correlation analysis showed that SA was positively correlated with TOM

AP and AK

and APA was positively correlated with TOM

AK and BD. In addition

UA was positively correlated with soil pH value and BD

and had a certain correlation with NH4+-N. [Conclusion] In a certain range

excessive or low water content and increased salt content can inhibit the soil nutrient contents and enzymatic activities

and there is a close relationship between soil nutrients and enzyme activities.

关键词

Keywords

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