文献类型：期刊文献

英文题名：Organic carbon storage and 14C apparent age of upland and riparian soils in a montane subtropical moist forest of southwestern China

作者：Liu, Xianbin[1,2] Zou, Xiaoming[2,3] Cao, Min[4] Luo, Tushou[5]

第一作者：Liu, Xianbin

通信作者：Zou, Xiaoming

机构：[1] College of Chemistry, Biology and Environment, Yuxi Normal University, Yuxi, 653100, China; [2] Department of Environmental Sciences, College of Natural Sciences, University of Puerto Rico, P.O. Box 70377, San Juan, PR, 00936-8377, United States; [3] College of Biology and the Environment, Nanjing Forestry University, Nanjing, 210037, China; [4] CAS Key Laboratory of Tropical Forest Ecology, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Kunming, 650223, China; [5] Research Institute of Tropical Forestry, Chinese Academy of Forestry, Guangzhou, 510520, China

年份：2020

卷号：11

期号：6

起止页码：1-19

外文期刊名：Forests

收录：EI(收录号：20202908951973);Scopus(收录号：2-s2.0-85087941972)

基金：This research was funded by the Scientific Research Funding (Yunnan Provincial Department of Education, China; 2019J0739) and the National Natural Science Foundation of China (31040015). Hua Du, Xuefeng Lu and Xiaohu Xiong in the Xi'an AcceleratorMass Spectrometry Center of Institute of Earth Environment (the Chinese Academy of Sciences) determined SOM ?13C and 14C data. We thank Douglas A. Schaefer working in the Xishuangbanna Tropical Garden for helpful comments, the sta of the Ailao Station for Forest Ecosystem Studies for field assistance, and Lu Qiao and Shangzhi Liu for collecting soil samples.

语种：英文

外文关键词：Deforestation - Digital storage - Landforms - Organic carbon - Soils - Storage (materials) - Textures - Tropics

摘要：Upland and riparian soils usually differ in soil texture and moisture conditions, thus, likely varying in carbon storage and turnover time. However, few studies have differentiated their functions on the storage of soil organic carbon (SOC) in sub-tropical broad-leaved evergreen forests. In this study, we aim to uncover the SOC storage and 14C apparent age, in the upland and riparian soils of a primary evergreen broad-leaved montane subtropical moist forest in the Ailao Mountains of southwestern China. We sampled the upland and riparian soils along four soil profiles down to the parent material at regular intervals from two local representative watersheds, and determined SOC concentrations, °13C values and 14C apparent ages. We found that SOC concentration decreased exponentially and 14C apparent age increased linearly with soil depth in the four soil profiles. Although, soil depth was deeper in the upland soil profiles than the riparian soil profiles, the weighted mean SOC concentration was significantly greater in the riparian soil (25.7 ± 3.9 g/kg) than the upland soil (19.7 ± 2.3 g/kg), but has an equal total SOC content per unit of ground area around 21 kg/m2 in the two different type soils. SOC °13C values varied between-23.7 (0.8)‰ and-33.2 (0.2)‰ in the two upland soil profiles and between-25.5 (0.4)‰ and-36.8 (0.4)‰ along the two riparian soil profiles, with greater variation in the riparian soil profiles than the upland soil profiles. The slope of increase in SOC 14C apparent age along soil depth in the riparian soil profiles was greater than in the upland soil profiles. The oldest apparent age of SOC 14C was 23,260 (230) years BP (before present, i.e., 1950) in the riparian soil profiles and 19,045 (150) years BP in the upland soil profiles. Our data suggest that the decomposition of SOC is slower in the riparian soil than in the upland soil, and the increased SOC loss in the upland soil from deforestation may partially be compensated by the deposition of the eroded upland SOC in the riparian area, as an under-appreciated carbon sink. ? 2020 by the authors. Licensee MDPI, Basel, Switzerland.