Effects of Simulated Groundwater Salinization on Soil Aggregate Stability and Organic Carbon Content in Alpine Wetland

YU Guangling; CHEN Mo; Maidinuer Abulaizi; HU Yang; JIA Hongtao; ZHOU Jianqin

doi:10.13870/j.cnki.stbcxb.2022.01.028

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Effects of Simulated Groundwater Salinization on Soil Aggregate Stability and Organic Carbon Content in Alpine Wetland

更新时间：2025-03-12

- Effects of Simulated Groundwater Salinization on Soil Aggregate Stability and Organic Carbon Content in Alpine Wetland
- Vol. 36, Issue 1, Pages: 212-218(2022)
- 作者机构：
  
  1. 新疆农业大学草业与环境科学学院,乌鲁木齐,830052
  2. 新疆土壤与植物生态过程重点实验室,乌鲁木齐,830052
- 作者简介：
- 基金信息：
- DOI：10.13870/j.cnki.stbcxb.2022.01.028
  CLC： S152.4
- Published：2022
- 稿件说明：
移动端阅览
YU Guangling, CHEN Mo, Maidinuer Abulaizi, et al. Effects of Simulated Groundwater Salinization on Soil Aggregate Stability and Organic Carbon Content in Alpine Wetland[J]. 2022, 36(1): 212-218.
DOI：

YU Guangling, CHEN Mo, Maidinuer Abulaizi, et al. Effects of Simulated Groundwater Salinization on Soil Aggregate Stability and Organic Carbon Content in Alpine Wetland[J]. 2022, 36(1): 212-218. DOI： 10.13870/j.cnki.stbcxb.2022.01.028.

摘要

为探究高寒湿地地下水咸化对土壤团聚体稳定性和有机碳库的影响

以巴音布鲁克高寒湿地季节性地表积水区和常年干燥区土壤为研究对象

设对照、微咸水、咸水和盐水4个矿化度

地下水NaCl含量分别为0

23 g/L

使用湿筛的方法将土壤团聚体分成不同的粒径。结果表明: 地下水矿化度升高对0—10 cm土壤团聚体分布影响不大

对10—30 cm土壤团聚体有显著影响。在10—30 cm土层中

＞2 mm土壤团聚体质量百分比随着矿化度升高先降低再升高

在2 g/L处理下降至最低1%~14%

而在23 g/L处理下＞2 mm团聚体质量百分比显著升高达到5%~56%。季节性地表积水区＞2 mm土壤团聚体质量百分比均高于常年干燥区。季节性地表积水区土壤团聚体平均重量直径(MWD)和几何平均直径(GMD)随着土层深度的增加呈现出先增大后减小的趋势

而常年干燥区MWD和GMD随着土层深度的增加而减小。0—10 cm土层土壤团聚体的MWD和GMD显著高于其他土层

10—30 cm土层内23 g/L处理下的MWD(0.71~3.59 mm)和GMD(0.25~1.64 mm)显著高于其余处理。0—10 cm土壤团聚体有机碳含量随着粒径的减小先升高后降低; 20—30 cm土壤团聚体有机碳含量与0—10 cm有机碳含量有着相似的趋势

23 g/L在2~0.25 mm粒径中分配的有机碳显著高于其他处理。由此可见

地下水矿化度升高对季节性地表积水区和常年干燥区10~30 cm土层的土壤团聚体稳定性和有机碳含量产生显著影响

地下水矿化度为2 g/L对土壤团聚体产生破坏作用

降低了土壤团聚体的稳定性; 而当矿化度升高为23 g/L时

对＞2 mm的土壤团聚体形成轻微的保护作用。随着土壤团聚体粒径的减小土壤有机碳含量降低

大团聚体(＞0.25 mm)中封存的土壤有机碳更多。

Abstract

The effect of groundwater salinization on the stability of soil aggregates and the organic carbon pool was explored using the soil in seasonally humid area and the perennial dry area of Bayinbuluk alpine wetland. Four levels of groundwater were used in this study including control (NaCl 0 g/L)

brackish water (NaCl 2 g/L)

salt water (NaCl 6 g/L)

and brine water (NaCl 23 g/L). The soil aggregates were classified into different sizes by wet sieving method. Results showed that the groundwater salinization had not significant effect of soil aggregates in 0—10 cm depth

but had a significant effect on the percentage of soil aggregates in 10-30 cm depth. With the increase of salinity

the percentage of soil aggregates > 2 mm first decreased and then increased. In 10—30 cm soil cglayer

the lowest values of the percentage of soil aggregates > 2 mm with the value between 1% and 14% were found in the 2 g/L treatment

while the values (5%~56%) increased significantly in the 23 g/L treatment. The percentage of soil aggregates > 2 mm in seasonally humid area was higher than that in perennial dry area. The mean weight diameter (MWD) and geometric mean diameter (GWD) in seasonally humid area increased first and then decreased with increasing soil depth

while MWD and GMD in perennial dry area decreased with increasing soil depth. MWD and GMD in 0—10 cm depth were significantly higher than those in other soil depths

and MWD (0.71~3.59 mm) and GMD (0.25~1.64 mm) under the 23 g/L treatment in 10—30 cm depth were significantly higher than those under the other treatments. Content of aggregate associated organic carbon in 0—10 cm depth first increased and then decreased with decreasing aggregates size. Content of aggregate associated organic carbon in 20—30 cm depth had similar change trend as in the 0-10 cm depth. Contents of soil organic carbon in 2~0.25 mm soil aggregates under the 6 and 23 g/L were significantly higher than other treatments. In conclusion

the groundwater salinization had a significant effect on the soil aggregates stability and organic carbon content in the 10—30 cm depth in the seasonal humid area and the perennial area

and the groundwater salinity of 2 g/L have damage effects on soil aggregates

which reduces the stability of the soil aggregates. The salinity with the value of 23 g/L has mild protective effect on > 2 mm soil aggregate. With decrease of the aggregates size

the soil organic carbon content reduces

and the content of macro-aggregate (> 0.25 mm) associated organic carbon is higher than other soil aggregates.

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