Measuring the Total and Sequestered Organic Matter Contents of Grassland and Forest Soil Profiles in the National Ecological Observatory Network Initiative
Measuring the Total and Sequestered Organic Matter Contents of Grassland and Forest Soil Profiles in the National Ecological Observatory Network Initiative
复制标题
国家生态观测站网络倡议中草地和森林土壤剖面的总有机物含量和固存有机物含量测量
DOI：
--
复制
发表时间：
2015
期刊：
影响因子：
--
通讯作者：
E. Ayres
中科院分区：
文献类型：
--
作者：
E. Ghabbour;G. Davies;Abeer A. Sayeed;Millicent Croman;Brittney A. Hoehing;E. Ayres
自2008年以来，东北大学的国家土壤项目（NSP）一直在测量美国50个州2000多个土壤层的总土壤有机质（SOM）含量。固存数据建立了土壤中SOM含量的基线，是土壤质量和健康状况的衡量标准。本文代表美国国家生态观测站网络(NEON) -NSP合作，报告了美国8个州在海拔25 - 1548 m和7级土壤深度200 cm的11个草地和森林剖面的总SOM含量和隔离SOM含量。这些土壤可以(i)作为其他土壤的比较标准，（ii）作为NEON测量的基准。总SOM通过优化的着火损失（LOI）测量，在650°C下干燥土壤样品12小时。固定的SOM由腐植酸（HA），黄腐酸（FA）和固定的溶解有机碳（DOC）形式的长寿命腐植酸物质（HS）代表。用重量法测定腐植酸；分别用可见分光光度法和紫外分光光度法测定游离脂肪酸和游离DOC。主要发现有：(i)数据大部分是可重复的；（ii）碳固存在A层以下急剧下降；（iii）有三种剖面类型（在6个A型剖面中，HA百分比随着深度的增加而最小，而在4个B型剖面中没有明显的最小值，而标记为C的Jornada剖面由于78 cm深度的碳酸盐屏障，HA百分比随着深度的增加而增加）；（iv）随着腐殖化率的增加，FA/HA比值降低，表明FA是HA的前体；(v)所有B类剖面的FA对HA的回归斜率为0.38（缅因州剖面为0.29），是这些土壤固存状态的度量；（vi）四个剖面的HA保留的水分大约是其总SOM的三倍，正如之前对缅因州北部土壤剖面所观察到的那样。同行评议论文
The National Soil Project (NSP) at Northeastern University has been measuring the total and sequestered soil organic matter (SOM) contents of more than 2000 soil horizons from all 50 US states since 2008. The sequestration data establish a baseline SOM content of a soil and are a measure of its quality and health. In this paper, on behalf of the National Ecological Observatory Network (NEON)–NSP collaboration we report the total and sequestered SOM contents of 11 grassland and forest profiles in eight US states at elevations of 25 to 1548 m and 7 soil orders to depths of 200 cm. Such soils serve (i) as standards with which other soils can be compared and (ii) as benchmarks for NEON measurements. Total SOM was measured by optimized loss-on-ignition (LOI) of dried soil samples at 650°C for 12 h. Sequestered SOM is represented by long-lived humic substances (HS) in the form of humic acids (HA), fulvic acids (FA), and sequestered dissolved organic carbon (DOC). Humic acids were measured gravimetrically; FA and sequestered DOC were measured by visible and UV spectrophotometry, respectively. Major findings are: (i) the data are mostly reproducible; (ii) carbon sequestration drops sharply below the A horizons; (iii) there are three profile types (in six Type A profiles the percentage HA exhibits a minimum with increasing depth, whereas no minimum is evident in the four Type B profiles investigated, and the Jornada profile labeled C features increasing percentage HA with increasing depth due to a carbonate barrier at 78 cm depth); (iv) decreasing FA/HA ratios with increasing percentage humification indicates FA as precursors of HA; (v) regression of FA against HA for all Type B profiles has a slope of 0.38 (cf. 0.29 for Maine profiles) and is a measure of the sequestration status of those soils; and (vi) HA in four of the profiles retain about three times more water than their total SOM, as observed previously for soil profiles in northern Maine. Peer Reviewed Papers
影响因子：
16.6
作者：
Vogel, Cordula;Mueller, Carsten W;Hoschen, Carmen;Buegger, Franz;Heister, Katja;Schulz, Stefanie;Schloter, Michael;Kogel-Knabner, Ingrid
通讯作者：
Kogel-Knabner, Ingrid