Title: The soil organic carbon density spatial heterogeneity and its impact factors under different karst landforms

Authors: Xingfu Wang; Xianfei Huang; Jiwei Hu; Zhenming Zhang

Addresses: School of Karst Science, Guizhou Normal University, Guiyang 550001, China ' Guizhou Provincial Key Laboratory Information System of Mountainous Areas and Protection of Environment, Guizhou Normal University, Guiyang 550001, China ' School of Karst Science, Guizhou Normal University, Guiyang 550001, China; Guizhou Provincial Key Laboratory Information System of Mountainous Areas and Protection of Environment, Guizhou Normal University, Guiyang 550001, China ' Institute of Biology, Guizhou Academy of Sciences, Guiyang 550001, China

Abstract: To study the spatial heterogeneity and effect factors of soil organic carbon density (SOCD) under different karst landforms, total of 1,173 samples were taken from different karst landforms including Puding (KP), Xingyi (KPCD), Guanling (KC), Libo (KVF) and Yinjiang (KTV) in Guizhou Province. SOCD characteristics in lands with different vegetation types, land uses and soil types under different karst landforms were analysed. The relationship between SOCD and environment factors was analysed via redundancy analysis. The results indicate that there is a larger discrepancy of SOCD among difference karst landforms types, and this distinction decreased gradually with the increasing of soil depth. The SOCD in soil horizons (0-100 cm) of KPCD, KP, KTV, KC and KVF were 11.10 kg·m⁻², 8.43 kg·m⁻², 8.13 kg·m⁻², 7.06 kg·m⁻² and 7.06 kg·m⁻², respectively. Soil thickness and rock exposure rate are critical factors affecting SOCD in karst regions.

Keywords: karst; different landform types; soil organic carbon density; SOCD; spatial heterogeneity; environment factors; impact mechanism.

DOI: 10.1504/IJGW.2020.110294

International Journal of Global Warming, 2020 Vol.22 No.2, pp.174 - 195

Received: 03 Dec 2019
Accepted: 30 Mar 2020
Published online: 13 Oct 2020 *

Full-text access for editors Full-text access for subscribers Purchase this article Comment on this article