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首页> 外文期刊>Catena: An Interdisciplinary Journal of Soil Science Hydrology-Geomorphology Focusing on Geoecology and Landscape Evolution >The role of soil as a carbon sink in coastal salt-marsh and agropastoral systems at La Pletera, NE Spain
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The role of soil as a carbon sink in coastal salt-marsh and agropastoral systems at La Pletera, NE Spain

机译：土壤作为沿海盐沼和山谷的碳汇在La Pletera，Ne西班牙的作用

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摘要

To evaluate the potential of natural and modified salt-marsh soils to store organic carbon and their soil properties, we investigated six soil environments located at La Pletera salt-marsh area, NE Spain. Namely, Ruderal (RU), rubbles over marsh for construction purpose, ELY covered by Elymus elymoides (Raf.) meadows, ART under Arthrocnemurn fruticosum L., SAL under Salicornia patula Duval Jouve, AGR under Zea mays L., and AME under Medicago saliva L. as artificial meadow. Soils were sampled at three depths (0-5, 5-20 and 20-40 cm). At 0-5 cm depth, soil organic carbon (SOC) was higher in ART soil (40.08 g kg(-1)) with respect to ELY, AME, AGR, SAL and RU (23.63, 11.45, 5.77, 4.40 and 3.18 g kg(-1) respectively). Glomalin (TGRSP) in ART had the same trend, with 8.88 g kg(-1) decreased by 51%, 77%, 89%, 92% and 94% in ELY, AME, AGR, SAL and RU soil respectively, indicating that in ART recalcitrant organic carbon may prevail. ART and ELY soils had higher SOC and GRSP than AGR and AME soils at 0-5 and 5-20 cm (on average + 70% and 57%) but SOC values were similar at 20-40 cm depth and glomalin was even higher in AGR and AME soils at this depth suggesting migration of stable organic compounds in cultivated soils. The water stable aggregates (WSA) analysed in the 0.25-2 mm and 2-5.6 mm fractions was also higher in ART and ELY soils (approximate to 90%) at 0-5 and 5-20 cm with respect to the other investigated soils. Higher WSA (fraction 0.25-5 mm) was found in AGR and AME soils at 20-40 cm corroborating that at higher GRSP corresponds higher aggregation. Potential carbon loss as C-CO2 (Mg ha(-1)) was evaluated at 0-5 cm depth and was much lower in ART soil. Accordingly, C-CO2/SOC ratio assigned to ART soil 1.85% of SOC loss against 8.26%, 11.64%, 18.90%, 20.37% and 22.72% of ELY, AME, RU, SAL and AGR soils respectively, indicating that only ART and ELY soils may exert clear carbon sequestration ability. The soil under annual Salicornia patula Duval Jouve (SAL) showed very low SOC (4.40 g kg(-1)) and the highest carbon loss potential (22.72%) due to shortage of organic decaying debris at surface. Also, C-TGRSP resulted higher in ELY and ART soils (2.51 and 1.31 Mg ha(-1)respectively) and C-TGRSP/SOC ratio demonstrated glomalin carbon enrichment in this order: ART > AME > ELY > AGR > SAL > RU, suggesting that carbon sequestration capacity may be assigned to ART and ELY soils, major carbon sinks in the Pletera salt-marsh area. Conversely, RU, AGR and AME soils, identified as ancient salt-marsh converted into agropastoral systems or altered for tourism purposes showed worse soil properties and higher sensitivity to carbon destabilization. Statistical treatment of data by factor analysis corroborated the obtained results outlining the importance of ART and ELY soils in maintaining best soil properties and the highest carbon storage capacity.
机译：为了评估天然和改性的盐渍土壤储存有机碳及其土壤性质的潜力，我们调查了位于La Pletera Salt-Marsh地区的六种土壤环境，Ne Spain。即，鲁莽（Ru），沼泽地为施工目的，由伊丽氏植物（RAF）覆盖，植物米德尔·普罗拉姆·普罗拉姆·鲁瓦尔·朱尔（Sal下）Zea Mays L.，Zea Mays L.和Ame下的allymus ellymoides ocys ocymusemutsum l.，al and arelymus elymuptes of ocymus elymuptes of ocymus。唾液L.作为人造草甸。在三个深度（0-5,5-20和20-40厘米）上采样土壤。在0-5厘米的深度，土壤有机碳（SoC）在艺术土壤中较高（40.08g kg（-1）），相对于ely，ame，agr，sal和ru（23.63,11.45,5.77,4.40和3.18g kg（-1）分别）。艺术中的Glomalin（TGRSP）具有相同的趋势，8.88g千克（-1）分别下降了51％，77％，89％，92％和94％，分别，AME，AGR，SAL和Ru土壤，表明这一点在术语中，顽抗有机碳可能占上风。艺术和伊利土壤的SOC和GRSP比agr和ame土壤在0-5和5-20厘米（平均+ 70％和57％），但SoC值在20-40厘米的深度下相似，毛细血管甚至更高该深度的Agr和Ame土壤表明培养土壤中稳定的有机化合物迁移。在0.25-2mm和2-5.6mm分析中分析的水稳定的聚集体（WSA）在第0-5-2-5.6mm的级分中也较高，并且相对于其他研究的土壤，在0-5和5-20cm处的污垢（近似为90％） 。在20-40厘米的Agr和Ame土壤中发现了更高的WSA（级分0.25-5mm），其在较高的GRSP在更高的GRSP上对应于更高的聚集。潜在的碳损失为C-CO 2（Mg Ha（-1））在0-5cm深度下评价，艺术土壤中得多。因此，分配给艺术土壤的C-CO2 / SOC比率为ALY，AME，Ru，Sal和Agr土壤的8.26％，11.64％，18.90％，20.37％和22.72％，表明只有艺术和伊利土壤可能施加透明的碳封存能力。每年的Salicornia Patula Duval Jouve（SAL）的土壤显示出非常低的SOC（4.40克））和最高的碳损失潜力（22.72％）由于表面的有机腐烂碎片短缺。此外，C-TGRSP ILLY且艺术土壤（分别为3.51和1.31 mg HA（-1），C-TGRSP / SOC比例均显示出Glomalin碳浓缩的顺序：ART> AME> ILY> AGR> SAL> RU据表明，可以将碳封存能力分配给艺术和孤独的土壤，主要碳汇在Pletera盐沼地区。相反，Ru，Agr和Ame土壤，被鉴定为古代盐沼转变为农石孢子系统或因旅游目的而改变，对土壤性质更差，对碳稳定化的敏感性较高。通过因子分析对数据进行统计处理证实了所获得的结果，概述了艺术的重要性，并在保持最佳土壤性质和最高碳储存能力方面的重要性。

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