生态学报2017，Vol.37Issue(1)：249-257,9.DOI:10.5846/stxb201607301560
红壤侵蚀地不同人工恢复林对土壤总有机碳和活性有机碳的影响
Effects of artificially restored forests on soil organic carbon and active organic carbon in eroded red soil
摘要
Abstract
Measuring soil organic carbon (SOC),especially active organic carbon,can be used to quickly evaluate the recovery of soil fertility and quality.Therefore,we performed field and laboratory experiments to investigate the vertical distribution of total and active organic carbon in different layers (0-60 cm) of eroded red soil in three typical artificially restored forests,i.e.,Pinus massoniana-broadleaved multiple layer forest (PB),Schima superba-Pinus massoniana mixed forest (SP),and broad-leaved mixed forest (BF).The SOC and organic carbon storage in different forests decreased with increasing soil depth and were ranked as follows:PB ＞ SP ＞ BF.The accumulation coefficients of surface SOC ranged from 0.49 to 0.55,which indicated that the surface soil had a high capacity to recover and maintain organic carbon.Soil readily oxidized organic carbon (ROC),dissolved organic carbon (DOC),and microbial biomass carbon (MBC) were calculated as 0.92-9.17 g/kg,535.89-800.46 mg/kg,and 27.24-261.31 mg/kg,respeotively,exhibiting reductions with the increasing soil depth.The content of active organic carbon was generally higher in the BF;and ROC constituted the largest proportion of active organic carbon (i.e.,ROC/SOC),followed by DOC (i.e.,DOC/SOC),whereas MBC accounted for the smallest proportion (i.e.,MBC/SOC).As soil depth increased,ROC/SOC and DOC/SOC exhibited decreasing and increasing trends,respectively,whereas MBC/SOC (microorganism entropy) varied erratically.The allocation to ROC/SOC was higher in the BF than in the other two forest types,which suggested that broad-leaved mixed forest is prone to the accumulation of active organic carbon.Therefore,we could develop dense planting and stereoscopic planting techniques to use at early stages of forest restoration,in order to improve the carbon density and fertility of degraded red soil,and broadleaved species could be planted into pioneer coniferous forests,such as those dominated by Pinus massoniana,in order to increase the active organic carbon content and,therefore,facilitate the recovery of available nutrients and soil function.关键词
人工恢复林/总有机碳/活性有机碳/红壤Key words
artificially restored forest/total organic carbon/active organic carbon/red soil引用本文复制引用
朱丽琴,黄荣珍,段洪浪,贾龙,王赫,黄诗华,易志强,张文锋..红壤侵蚀地不同人工恢复林对土壤总有机碳和活性有机碳的影响[J].生态学报,2017,37(1):249-257,9.基金项目
国家自然科学基金资助项目(31160179) （31160179）
江西省自然科学基金资助项目(20151BAB204033) （20151BAB204033）
江西省水利厅科技资助项目(KT201546) （KT201546）
江西省高校“十二五”水土保持与荒漠化防治重点学科培育基金资助项目 （）
