文献类型：期刊文献

英文题名：Organic Carbon Storage and C-14 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, XM[1];Zou, XM[2]

机构：[1]Yuxi Normal Univ, Coll Chem Biol & Environm, Yuxi 653100, Peoples R China;[2]Univ Puerto Rico, Coll Nat Sci, Dept Environm Sci, POB 70377, San Juan, PR 00936 USA;[3]Nanjing Forestry Univ, Coll Biol & Environm, Nanjing 210037, Peoples R China;[4]Chinese Acad Sci, CAS Key Lab Trop Forest Ecol, Xishuangbanna Trop Bot Garden, Kunming 650223, Yunnan, Peoples R China;[5]Chinese Acad Forestry, Res Inst Trop Forestry, Guangzhou 510520, Peoples R China

年份：2020

卷号：11

期号：6

外文期刊名：FORESTS

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000553479700001)】；

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).

语种：英文

外文关键词：Ailao Mountains; riparian soil; SOC concentration; SOC delta C-13; soil profile; soil residence time; soil texture; southwestern China; subtropical moist forest; upland soil

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 C-14 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, delta C-13 values and C-14 apparent ages. We found that SOC concentration decreased exponentially and C-14 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/m(2) in the two different type soils. SOC delta C-13 values varied between -23.7 (+/- 0.8)parts per thousand and -33.2 (+/- 0.2)parts per thousand in the two upland soil profiles and between -25.5 (+/- 0.4)parts per thousand and -36.8 (+/- 0.4)parts per thousand 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 C-14 apparent age along soil depth in the riparian soil profiles was greater than in the upland soil profiles. The oldest apparent age of SOC C-14 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.