辽河口湿地翅碱蓬群落及其交错区土壤盐分特征

doi:10.16843/j.sswc.2019.01.016

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Abstract [Background] The floristic and plant distribution of coastal wetland are significantly affected by soil salinity, Suaeda heteroptera, as a typical plant in the Liaohe estuary wetlands of Liaoning province, forms a unique landscape of red beach, which attracts tourists from inland and abroad. However, the area of S. heteroptera in Liaohe estuary wetland is decreasing year by year since 2015. Thus it is very urgent for us to protect the S. heteroptera with analyzing the main factors of soil salinization and estimating the salinity growth threshold of S. heteroptera in Liaohe estuary wetland.[Methods] In April 2018, we selected a sample plot in Liaohe estuary wetland with S. heteroptera distribution, we chose 3 types of area, junction area of bare beach and S. heteroptera, pure S. heteroptera growing area, and junction area of S. heteroptera and Phragmites australis. Soil samples at depths of 0-10 cm, 10-20 cm and 20-30 cm were collected according to the "three-point sampling method". Soil base ion index, Na⁺、K⁺、Ca²⁺、Mg²⁺、Cl^-、SO₄^2-、HCO₃^- and pH,was measured by experiment. All data were analyzed by SPSS and Excel for statistical analysis.[Results] The cations in distribution areas of S. heteroptera were mainly Na⁺, K⁺, Ca²⁺ and Mg²⁺, while the anions were mainly Cl^-, SO₄^2- and HCO₃^-. The soil salinity anions in each layer were mainly Cl^-, accounting for 18.55%, 17.3% and 23.95% of soil base ions at 0-10 cm, 10-20 cm and 20-30 cm, respectively. Cations were mainly Na⁺, accounting for 43.2%, 42.2% and 35.8% of 3 soil layers from top to bottom. Correlation analysis results demonstrated that the soil total salt content and HCO₃^-, was positively associated with other base ions, the anion in the strongest correlation with total salt was Cl^-, and the correlation coefficient was 0.966; the cations in the strongest correlation were Ca²⁺ and Na⁺, and the correlation coefficient was 0.956 and 0.912, respectively, The correlation between soil pH and HCO₃^- was insignificantly positive, but negative correlation with other base ions. The pH value at the junction of reed and S. heteroptera area and pure S. heteroptera area were higher than that at the junction area of bare beach and S. heteroptera, and the pH value generally increased with the deepening of soil layer. The results of principal component analysis showed that the 4 ions of Na⁺, Ca²⁺, Cl^- and SO₄^2- accounted for more than 85% of all base ions in the soil at a depth of 0-30 cm within the region, which were the main ion types affecting soil salinity. The HCO₃^- presented a certain effect on soil alkalinity.[Conclusions] The thresholds of soil salt content in 0-30 cm ranged in 9.54-18.46 cmol/kg in the pure S. heteroptera growing area and its 2 junction areas of Liaohe estuary wetland. The results of principal component analysis provide theoretical basis for comprehensive analysis and evaluation of soil salt spatial distribution in S. heteroptera community and its interlaced areas.

Key words： Liaohe estuary wetland Suaeda heteroptera base ion principal component analysis

Received: 05 January 2018

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S157

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	YANG Chuye
	WANG Li
	SU Fangli
	LI Haifu

Cite this article:

YANG Chuye,WANG Li,SU Fangli, et al. Characteristics of soil salinity in the distribution area of Suaeda heteroptera in Liaohe estuary wetlands[J]. SSWC, 2019, 17(1): 117-123.

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http://journal12.magtechjournal.com/Jweb_stbc/EN/10.16843/j.sswc.2019.01.016 OR http://journal12.magtechjournal.com/Jweb_stbc/EN/Y2019/V17/I1/117

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