生态学报Issue(23)：7878-7886,9.DOI:10.5846/stxb201404180761
海南尖峰岭热带山地雨林土壤有机碳密度空间分布特征
Spatial distribution characteristics of soil organic carbon density in a tropical mountain rainforest of Jianfengling, Hainan Island, China
摘要
Abstract
Forest soil organic carbon ( SOC) is the main component of the terrestrial carbon reservoir, and plays a crucial role in the Earth's carbon cycle. This study aimed to quantify the spatial heterogeneity and distribution patterns of SOC density. The study was conducted in a 60 hm2 forest plot in a tropical mountain rainforest of Jianfengling, Hainan Island, China, using field investigation, laboratory analysis, and geostatistical methods. The results showed that the mean SOC density at different soil profile depths (A [0—10 cm], B [10—30 cm], and C [30—60 cm]) was 2.699, 2.782, 2.434 kg/m2, respectively. The differences for A versus C and, B versus C layers were statistically significant (P < 0.05), but there was no significant difference between A and B layers ( P > 0.05) . Cross-validation results showed that the most fitted models for SOC density at different layers was exponential for A and spherical for B and C. The ranges of SOC density were 54.2 m, 70.9 m, and 97.2 m for A, B, and C, respectively, while the Nugget:Sill ratios were 0.512, 0.708, and 0.882, respectively. This result implies that SOC density is moderately variable for A and B, but weakly variable for C. Thus, SOC had more significant spatial variability at the small scale.Pearson correlation analysis showed that the correlation coefficients for A versus C and B versus C were less than that between B and C, indicating that different ecological processes may regulate SOC density across surface and subsurface soil layers. Ordinary Kriging interpolation showed that A and B soil layers had moderate spatial autocorrelation, whereas the C layer had weak spatial autocorrelation. Meanwhile, the contour maps produced scattered spatial distributions for the A and B layers, but a banded distribution for the C layer. Topography-induced water and heat distribution may represent an important factor affecting the spatial distribution patterns of SOC density in different soil layers.关键词
土壤有机碳/空间变异/地统计学/热带山地雨林/海南岛Key words
soil organic carbon/spatial heterogeneity/geostatistics/tropical mountain rainforest/Hainan Island引用本文复制引用
郭晓伟,骆土寿,李意德,许涵,陈德祥,林明献,周璋,杨怀..海南尖峰岭热带山地雨林土壤有机碳密度空间分布特征[J].生态学报,2015,(23):7878-7886,9.基金项目
林业公益性行业科研专项经费课题(201104008,201104057,201104009) （201104008,201104057,201104009）
