YIC-IR  > 中科院海岸带环境过程与生态修复重点实验室
Alternative TitleDistribution of soil salt ions around Tamarix chinensis individuals in the Yellow River Delta
张立华1,2; 陈沛海3; 李健3; 陈小兵1,2; 冯亚4
Source Publication生态学报
Keyword黄河三角洲 盐碱地 柽柳 盐岛 盐分离子 alkalinity community structure concentration (composition) ecosystem function halophyte ion ion exchange root-shoot ratio salinity shrub soil chemistry spatial distribution


Other Abstract

Spatial heterogeneity is considered a ubiquitous feature of natural ecosystems. A typical example of spatial heterogeneity in ecosystems is the formation of salt islands, which form around small shrubs and are important local and regional salt reserves that influence community structure and ecosystem function. These salt islands are formed where salts accumulate under the shrub canopy. Soil salinity has been shown to vary significantly between areas covered by shrub canopies and interspaces. To quantify the effect of halophyte plants on the salinity characteristics of salt islands in saline and alkaline soil, the native Tamarix chinensis of the Yellow River Delta (YRD) was selected as a study species, and its soil salt ion composition and content were analyzed. Differences in the cation and anion contents and ratios among distances and horizons were analyzed using an analysis of variance and multiple comparisons. A correlation analysis was also conducted, to determine the relationships among different salt ions. The results show that salt islands are mainly distributed in the surface soil. Both the cations and the anions were present in higher concentrations near T. chinensis individuals. Of the cations, Na + was found in the highest levels of the profile, followed by Ca 2+ and Mg 2+ in the lower layers, and K + in the deepest part of the profile. Anions in all soil depths both showed Cl - > SO 2- 4 > HCO - 3 , but CO 2- 3 was not detected. The distance from the center of the shrub to the sampling point had a significant effect on most salt ions and their ratios, with the exception of Ca 2+ , Mg 2+ , SO 2- 4 , Na + / Ca 2+ , Ca 2+ / Mg 2+ , and Cl - / SO 2- 4 . The soil depth had a significant effect on almost all of ions and ratios, with the exception of the Na + / K + ratio. The interaction between distance and depth only had a significant effect on Cl - and HCO - 3 . Na + / K + , Ca 2+ / K + , Mg 2+ / K + , and Ca 2+ / Mg 2+ increased in the 0—20 cm layer, while the Na + / Ca 2+ and Na + / Mg 2+ ratios decreased along the gradient between the canopied area and the interspace. Therefore, the cations enrichment due to the proximity of a T. chinensis individual was as follows: K + > Na + > Mg 2+ > Ca 2+ . However, anions enrichment was determined to occur as follows: HCO - 3 > Cl - > SO 2- 4 as Cl - / SO 2- 4 decreased and Cl - / HCO - 3 and SO 2- 4 / HCO - 3 increased in the 20—40 cm soil layer, along the gradient from the shrub center to the interspace. The total soluble salt content of the soil increased with depth. However, K + , SO 2- 4 , and HCO - 3 concentration decreased with soil depth, indicating the presence of significant surface accumulation. The Na + / K + , Na + / Ca 2+ , Na + / Mg 2+ , Ca 2+ / K + , Mg 2+ / K + , Cl - SO 2- 4 , and Cl - / HCO - 3 ratios increased and Ca 2+ / Mg 2+ decreased significantly with increased depth; however, SO 2- 4 / HCO - 3 didn′ t change significantly with depth. Consequently, the downward migration of cations and anions was ranked as follows: Na + > Mg 2+ > Ca 2+ > K + , and Cl - > SO 2- 4 ≈ HCO - 3 , respectively. The relationships among different salt ions were significant, but no significant correlation was found between SO 2- 4 and Na + or between SO 2- 4 and Ca 2+ concentration. In conclusion, the root biomass and distribution, the climatic conditions (e.g., evaporation and precipitation), the rate of salt ion migration, and the sampling time may influence the detected distribution of cations and anions in the soil. The findings of this study may serve as a reference for the elucidation of the salinization-alkalization processes at work in coastal saline soil, and in the amelioration of the soil in the Yellow River Delta.

Funding Organization国家自然科学基金项目(41201293) ; 海洋公益性行业科研专项(201105020)
Indexed ByEI ; CSCD
EI Keywordsalkalinity ; community structure ; concentration (composition) ; ecosystem function ; halophyte ; ion ; ion exchange ; root-shoot ratio ; salinity ; shrub ; soil chemistry ; spatial distribution
EI Accession Number5012304
Citation statistics
Document Type期刊论文
Corresponding Author张立华
Affiliation1.中国科学院海岸带环境过程与生态修复重点实验室(烟台海岸带研究所),山东省海岸带环境过程重点实验室,中国科学院烟台海岸带研究 所
Recommended Citation
GB/T 7714
张立华,陈沛海,李健,等. 黄河三角洲柽柳植株周围土壤盐分离子的分布[J]. 生态学报,2016,36(18):9.
APA 张立华,陈沛海,李健,陈小兵,&冯亚.(2016).黄河三角洲柽柳植株周围土壤盐分离子的分布.生态学报,36(18),9.
MLA 张立华,et al."黄河三角洲柽柳植株周围土壤盐分离子的分布".生态学报 36.18(2016):9.
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