Loss-on-Ignition Method to Assess Soil Organic Carbon in Calcareous Everglades Wetlands

被引:85
|
作者
Wright, Alan L. [1 ]
Wang, Yu [2 ]
Reddy, K. R. [2 ]
机构
[1] Univ Florida, Everglades Res & Educ Ctr, Belle Glade, FL 33430 USA
[2] Univ Florida, Soil & Water Sci Dept, Wetland Biogeochem Lab, Gainesville, FL USA
关键词
Everglades; loss on ignition; total C; wetlands;
D O I
10.1080/00103620802432931
中图分类号
S3 [农学(农艺学)];
学科分类号
0901 ;
摘要
Measurement of soil carbon (C) is important for determining the effects of Everglades restoration projects on C cycling and transformations. Accurate measurement of soil organic C by automated carbon-nitrogen-sulfur (CNS) analysis may be confounded by the presence of calcium carbonate (CaCO3) in Everglades wetlands. The objectives of this study were to compare a loss-on-ignition (LOI) method with CNS analysis for assessment of soil C across a diverse group of calcareous Everglades wetlands. More than 3168 samples were taken from three soil depths (floc, 0-10, 10-30cm) in 14 wetlands and analyzed for LOI, total C, and total calcium (Ca). The LOI method compared favorably to CNS analysis for LOI contents ranging from 0 to 1000gkg-1 and for soil total Ca levels from 0 to 500gCakg-1. For all wetlands and soil depths, LOI was significantly related to total C (r2 = 0.957). However, LOI was a better predictor of total C when LOI exceeded 400gkg-1 because of less interference by CaCO3. Total C measurement by CNS analysis was problematic in soils with high total Ca and low LOI, as the presence of CaCO3 confounded C analysis for LOI less than 400gkg-1. Inclusion of total Ca in regression models with LOI significantly improved the prediction of total C. Estimates of total organic C by CNS analysis were obtained by accounting for C associated with CaCO3 by calculation, with results being similar to total organic C values obtained from LOI analysis. The proportion of C in organic matter measured by the LOI method (51%) was accurate and applicable across wetlands, soil depths, and total Ca levels; thus LOI was a suitable indicator of total organic C in Everglades wetlands.
引用
收藏
页码:3074 / 3083
页数:10
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