洪水漫溢对塔里木河中游河岸胡杨林土壤有机碳及活性组分的影响

• 作者： 马继龙1,2,3 史军辉2,3 王新英2,3 阿丽亚·拜都热拉1 刘茂秀2,3 艾吉尔·阿不拉2,3
• 作者单位：
  1.  新疆农业大学林学与风景园林学院，新疆乌鲁木齐830052
  2.  新疆林科院造林治沙研究所，新疆乌鲁木齐 830063
  3.  新疆塔里木河胡杨林生态系统国家定位观测研究站，新疆乌鲁木齐830046
• 提交时间：2023-08-26

摘要: 塔里木河生态输水使流域两岸洪水漫溢强度增加，进而对河岸胡杨林生态系统碳循环产生了重要影响。以塔里木河中游周期性洪水漫溢区胡杨林为研究对象，测定并分析河岸胡杨林洪水漫溢过程中漫溢前（W1）、漫溢第4 d（W2）、漫溢第17 d（W3）和退水后（W4）4个不同阶段1 m土体有机碳及活性组分含量的变化特征。结果表明：（1）SOC（土壤有机碳）含量在漫溢前均高于漫溢后；洪水漫溢对0~20 cm土层SOC含量的影响较20~100 cm土层显著；在同一阶段内，随着土层的深入，SOC含量呈降低趋势。（2）0~10 cm及40~100 cm土层的土壤DOC（可溶性有机碳）、MBC（微生物生物量碳）含量在漫溢第4 d较漫溢前均显著升高，但随着漫溢时间的延长，其含量逐渐降低，且各阶段间差异显著(P<0.05)；同一土层随漫溢时间的延长DOC/SOC、MBC/SOC差异显著(P<0.05)。（3）漫溢前0~10cm土层EOC（易氧化有机碳）含量高于漫溢后，其他土层EOC含量则表现为漫溢期高于漫溢前及退水后；0~10 cm、20~60 cm土层EOC/SOC在不同漫溢阶段间差异显著(P<0.05)。（4）漫溢前至漫溢第17 d SOC与DOC含量呈极显著正相关（r＞0.69，n=15），退水后EOC和DOC呈显著正相关（r=0.54，n=15），漫溢前SOC和DOC含量与漫溢后各阶段含量之间相关性显著。综上所述，塔里木河中游洪水漫溢过程对河岸胡杨林SOC及活性组分分布产生了显著影响，并且各组分的敏感土层不同，SOC以0~20 cm土层影响最为显著，DOC、MBC以0~10 cm及40~100 cm土层影响最为显著，EOC则为20~60 cm土层影响最为显著，其变化规律具有森林和湿地的双重特征。

Abstract: The ecological water transport of the Tarim River increases flood intensity on both sides of the basin,which has an important effect on the carbon cycle of the riparian Populus euphratica forest ecosystems. Westudied the P. euphratica forest in the middle reaches of the Tarim River and the content changes of organiccarbon and measured and analyzed the active components of the riparian P. euphratica forest at four differentstages (1 m before (W1); 4 days after (W2); 17 days after (W3); and after (W4)). We found that the soil organiccarbon (SOC) content was higher before and after overflow. The effect of flood overflow on the SOC content inthe 0-20 cm soil layer was more significant than that of the 20-100 cm soil layer. During the same stage, theSOC content decreased with soil layer depth. The dissolved organic carbon (DOC) and microbial biomass carbon(MBC) in the 0-10 cm and 40-100 cm soil layers were significantly increased on the 4th day of the overflowcompared to before the overflow. The contents decreased gradually with the extension of the overflow time. Thedifferences between each stage were significant (P 0.69,n = 15) and a significantly positive correlation between EOC and DOC content after discharge (r = 0.54, n = 15).There was a significant correlation between SOC and DOC content before the overflow and at various stagesafter the overflow. Based on the above analysis, the flooding process in the middle reaches of the Tarim River hada significant effect on the distribution of SOC and the active components of the riparian poplar forest, withdifferences found in the sensitive soil layers of each component. SOC was most significant in the 0-20 cm soillayer. DOC and MBC were most significant in the 0-10 cm soil layer and the 40-100 cm soil layer, respectively,and EOC was most significant in the 20-60 cm soil layer. Thus, the observed change regularity has the dualcharacteristics of forest and wetland.

• 分类： 农、林、牧、渔 >> 土壤学
• 引用： ChinaXiv:202308.00677 (或此版本 ChinaXiv:202308.00677V1)
  doi:10.12074/202308.00677
• 推荐引用方式： 马继龙1,2,3,史军辉2,3,王新英2,3,阿丽亚·拜都热拉1,刘茂秀2,3,艾吉尔·阿不拉2,3.(2023).洪水漫溢对塔里木河中游河岸胡杨林土壤有机碳及活性组分的影响.干旱区研究.[ChinaXiv:202308.00677] (点此复制)