Alteration of soil microbial communities and water quality in restored wetlands
Alteration of soil microbial communities and water quality in restored wetlands
复制标题
DOI：
10.1016/j.soilbio.2005.09.027
复制
发表时间：
2006-06-01
影响因子：
9.7
通讯作者：
Fujii, R
中科院分区：
文献类型：
--
作者：
Bossio, DA;Fleck, JA;Fujii, R
土地利用是土壤微生物群落组成和活性的重要决定因素，而微生物群落组成和活性反过来又决定土壤中有机质的分解速率和分解产物。永久淹没湿地中的微生物群落，如加利福尼亚州萨克拉门托-圣华金三角洲岛屿上的湿地恢复所创造的微生物群落，在有限的曝气条件下发挥作用，导致厌氧菌随深度增加。假设从农业管理向永久淹水湿地的转变将改变微生物群落组成，增加三角洲水域中溶解有机碳(DOC)化合物的数量和活性；与土壤类型和农业管理等其他环境因素的影响相比，对微生物群落的影响更大。根据磷脂脂肪酸(PLFA)分析，恢复湿地的微生物群落活性与农田相比发生了显著变化，湿地微生物群落随土壤深度的变化较大。湿地和农业土壤中单不饱和脂肪酸的相对丰度均随土壤深度的增加而降低，而支链脂肪酸在湿地各土层中的相对丰度均高于农田。利用脂肪酸官能团将分解条件与DOC的数量和质量联系起来，得出结论：湿地中受限的曝气条件与活性碳化合物的产生密切相关。但目前的植被可能在决定恢复后的湿地中DOC质量方面发挥了同样重要的作用。在一项更大规模的分析中，包括来自三角洲岛屿湿地和农业现场的数据，以及来自萨克拉门托山谷的前两项研究的数据，曝气梯度被定义为土壤类型和土地利用中活跃微生物群落的主要决定因素。(C)2005爱思唯尔有限公司。保留所有权利。
Land usage is a strong determinant of soil microbial community composition and activity, which in turn determine organic matter decomposition rates and decomposition products in soils. Microbial communities in permanently flooded wetlands, such as those created by wetland restoration on Sacramento-San Joaquin Delta islands in California, function under restricted aeration conditions that result in increasing anaerobiosis with depth. It was hypothesized that the change from agricultural management to permanently flooded wetland would alter microbial community composition, increase the amount and reactivity of dissolved organic carbon (DOC) compounds in Delta waters; and have a predominant impact on microbial communities as compared with the effects of other environmental factors including soil type and agricultural management. Based on phospholipid fatty acid (PLFA) analysis, active microbial communities of the restored wetlands were changed significantly from those of the agricultural fields, and wetland microbial communities varied widely with soil depth. The relative abundance of monounsaturated fatty acids decreased with increasing soil depth in both wetland and agricultural profiles, whereas branched fatty acids were relatively more abundant at all soil depths in wetlands as compared to agricultural fields. Decomposition conditions were linked to DOC quantity and quality using fatty acid functional groups to conclude that restricted aeration conditions found in the wetlands were strongly related to production of reactive carbon compounds. But current vegetation may have had an equally important role in determining DOC quality in restored wetlands. In a larger scale analysis, that included data from wetland and agricultural sites on Delta islands and data from two previous studies from the Sacramento Valley, an aeration gradient was defined as the predominant determinant of active microbial communities across soil types and land usage. (c) 2005 Elsevier Ltd. All rights reserved.