中文关键词土壤可溶性有机碳(SDOC)土壤可溶性无机碳(SDIC)土壤可溶性碳(SDC)咸水灌溉沙漠公路防护林 英文关键词soil dissolved organic carbon (SDOC)soil dissolved inorganic carbon (SDIC)soil dissolved carbon (SDC)saline irrigationdesert highway shelterbelt

作者	单位	E-mail
孟天歌	西北农林科技大学资源环境学院, 农业部西北植物营养与农业环境重点实验室, 杨凌 712100	1270509212@qq.com
吴路遥	西北农林科技大学资源环境学院, 农业部西北植物营养与农业环境重点实验室, 杨凌 712100
张少磊	西北农林科技大学资源环境学院, 农业部西北植物营养与农业环境重点实验室, 杨凌 712100
徐燕莹	西北农林科技大学资源环境学院, 农业部西北植物营养与农业环境重点实验室, 杨凌 712100
李雄	西北农林科技大学资源环境学院, 农业部西北植物营养与农业环境重点实验室, 杨凌 712100
张建国	西北农林科技大学资源环境学院, 农业部西北植物营养与农业环境重点实验室, 杨凌 712100 黄土高原土壤侵蚀与旱地农业国家重点实验室, 杨凌 712100	zhangjianguo21@nwafu.edu.cn

中文摘要 可溶性碳（DC）是土壤中最活跃的碳组分，植被恢复与重建加速了干旱荒漠区的碳循环过程.研究咸水灌溉下沙漠人工防护林地土壤剖面DC的分布，可为干旱荒漠区人工林的管理和开发利用提供理论支撑和决策依据.本研究选取塔克拉玛干沙漠公路沿线5个不同矿化度咸水滴灌林地作为研究样地，流沙地为对照（CK），分析并讨论了0~1 m剖面土壤可溶性有机碳（SDOC）和可溶性无机碳（SDIC）的垂直分布特征及其与各因子间的相关关系.结果表明，CK与2.82 g·L^-1矿化度滴灌处理SDOC、SDIC呈"I"型分布，其分布满足线性函数关系，其他各样地SDOC和SDIC均呈"Γ"型分布，分布满足幂函数关系；所有处理表层SDOC、SDIC波动能力及贡献度均高于下层土壤，且SDOC波动及贡献度均大于SDIC，2.82 g·L^-1之外的各林地SDOC平均含量是SDIC的2~4倍；2.82 g·L^-1样地SDOC平均含量低于CK，其他各样地SDOC是CK的3~5倍，各样地SDIC含量较CK增加了15.0%~57.9%；矿化度高于2.82 g·L^-1的样地0~5 cm土层SDOC含量随灌溉水矿化度的增加而增加，各样地SDIC含量随矿化度的升高呈先增加后下降低趋势，4.82 g·L^-1样地达到最大.SDOC和SDIC与灌溉水矿化度、EC、SOC、SIC及土壤含水量均呈正相关关系，其中与土壤含水量表现出弱正相关，SDOC和SDIC与土层深度呈负相关关系；SDOC和SDIC与pH分别呈微弱的负相关和微弱的正相关.总之，灌溉水矿化度对SDOC和SDIC的垂直分布具有重要影响，同时与土壤含水量、土层深度、EC、SOC和SIC等因素紧密相关，这对极端干旱区人工林建设及管护具有重要意义. 英文摘要 Dissolved carbon (DC) is the most active carbon fraction in soils. Vegetation restoration and reconstruction accelerate the carbon cycle in arid desert regions. Studying the DC distribution in soil profiles of artificial shelterbelt under saline irrigation can provide theoretical support and decision-making basis for artificial shelterbelt management, development, and utilization in arid desert areas. In this study, we took the artificial shelterbelts drip-irrigated with five different mineralization and one shifting sandy land (CK) along the Taklimakan Desert Highway as sampling plots, analyzed and discussed the vertical distribution characteristics of soil dissolved organic carbon (SDOC) and dissolved inorganic carbon (SDIC) in the 0-1 m profiles, and further analyzed their relationships among different factors. The results showed that SDOC and SDIC of CK and shelterbelts under 2.82 g·L^-1 irrigation showed an "I" type distribution with a linear function relationship. The SDOC and SDIC of four other treatments showed a "Γ" type distribution with power function relationships. The fluctuation ability and contribution degree of SDOC and SDIC of different treatments in the surface layer were higher than those in the lower layers, and the fluctuation and contribution intensity of SDOC were higher than those of SDIC. Except for 2.82 g·L^-1 treatment, the average SDOC contents of other treatments were 2-4 times those of SDIC. The average SDOC content of 2.82 g·L^-1 treatment was lower than CK; other treatments were 3-5 times that of CK; and the average SDIC content of all treatments increased 15.0%-57.9% than CK. For the 0-5 cm layer, SDOC content increased with the irrigation water mineralization except the 2.82 g·L^-1 treatment, but SDIC content firstly increased and then decreased with increasing mineralization, and that for the 4.82 g·L^-1 treatment was highest. The SDOC and SDIC were positively correlated with EC, SOC, irrigation water mineralization, SIC, and soil moisture, for which they both showed a weak positive correlation with soil moisture; they were negatively correlated with soil depth. The SDOC and SDIC showed a weak negative correlation and a weak positive correlation with pH, respectively. In summary, the mineralization of irrigation water has an important impact on the vertical distribution of SDOC and SDIC, and their distribution also has close relationships with EC, SOC, SIC, soil moisture, and soil depth, which is of great significance for plantations in extremely drought deserts.

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