马阳阳 1孟晨 2屈建军 2王丽 2杜倩倩 2潘斌1
作者信息
- 1. 宁夏大学西北土地退化与生态系统恢复国家重点实验室，宁夏 银川 750021;宁夏大学林业与草业学院，宁夏 银川 750021
- 2. 宁夏大学西北土地退化与生态系统恢复国家重点实验室，宁夏 银川 750021;宁夏大学生态环境学院，宁夏 银川 750021
- 折叠
摘要
本研究以宁夏盐池县荒漠草原区未种柠条样地为对照（CK）和柠条不同种植年限样地为研究对象，比较分析柠条引入对土壤碳氮组分及大孔隙的影响。结果表明：0~10 cm土层，与CK相比，土壤颗粒有机碳（POC）在11 a龄样地降低，有机碳（SOC）、矿物结合态有机碳（MAOC）、易氧化有机碳（EOC）、可溶性有机碳（DOC）含量均随种植年限呈上升趋势，其含量峰值依次出现在26 a龄、16 a龄、26 a龄和37 a龄样地。全氮（TN）、硝态氮（NO-3 - N）含量在26 a龄、37 a龄样地分别提升74.5%、868.07%；10~20 cm土层中，26 a龄样地TN增幅达196.4%，37 a龄样地铵态氮（NH+4 - N）增幅高达 22.8%。CT 扫描显示土壤大孔隙网络随年限演变，37 a 龄样地孔隙数量密度提升131%，16 a龄样地连接度最优（177.95），土壤大孔隙发育与碳氮组分含量存在显著阶段性相关关系，孔隙生成可促进活性有机碳累积；16 a龄、26 a龄样地的孔隙高连通性推动土壤氮素转化；而37 a龄样地孔隙结构趋于复杂，造成土壤碳、氮储存效率出现分化。
Abstract
In this study, the effects of Caragana korshinskii introduction on soil carbon and nitrogen components and macropores were compared and analyzed with the control (CK) and different planting years of Caragana korshinskii in the desert steppe area of Yanchi County, Ningxia. The results showed that in the 0~10 cm soil layer, compared with CK, the soil particulate organic carbon (POC) decreased in the 11 years old plot, and the contents of organic carbon (SOC), mineral-bound organic carbon (MAOC), easily oxidized organic carbon (EOC) and dissolved organic carbon (DOC) increased with the planting years, and the peak contents appeared in the 26 years old, 16 years old, 26 years old and 37 years old plots in turn. The contents of total nitrogen (TN) and nitrate nitrogen ( NO-3 - N ) increased by 73.22% and 868.07% respectively in 26 years old and 37 years old plots. In the 10-20 cm soil layer, the increase of TN in the 11 years old sample was 196.35%, and the increase of ammonium nitrogen ( NH+4 - N ) in the 37 years old sample was as high as 948.57%. CT scan showed that the soil macropore network evolved with age. The pore volume density of the 37 years old plot increased by 131%, and the connectivity of the 16 years old plot was the best (177.95). There was a significant stage correlation between the development of soil macropores and the content of carbon and nitrogen components: poreformation could promote the accumulation of active organic carbon ; the pore high connectivity of the 16 and 26 years old plots promoted soil nitrogen transformation. The pore structure of the 37 years old plot tends to be complex, resulting in the differentiation of soil carbon and nitrogen storage efficiency.关键词
人工柠条/碳氮组分演变/灰色关联度/大孔隙Key words
artificial Caragana korshinskii/carbon and nitrogen component evolution/grey relation analysis/macropores引用本文复制引用
马阳阳,孟晨,屈建军,王丽,杜倩倩,潘斌.荒漠草原柠条引入后土壤碳氮组分对大孔隙的响应[EB/OL].(2026-07-23)[2026-07-29].https://chinaxiv.org/abs/202607.00196.学科分类
生物科学现状、生物科学发展/环境生物学
