生态学报2018，Vol.38Issue(2)：657-667,11.DOI:10.5846/stxb201610312219
南亚热带森林土壤碳库稳定性与碳库管理指数对模拟酸雨的响应
Effects of simulated acid rain on soil labile organic carbon and carbon management index in subtropical forests of China
摘要
Abstract
Four gradients of simulated acid rain treatment [pH 3.0,3.5,4.0 and CK (lake water)] were designed to determine the effects of simulated rain on soil carbon stabilization and the carbon management index (CMI) in three subtropical forests at different successional stages.The stages are,a young pine forest (PF),a transitional mixed conifer and broadleaf forest (MF),and an old grow-growth broadleaved forest (BF) at the Dinghushan Nature Reserve.The soil organic carbon (SOC),readily oxidation organic carbon (ROC),particulate organic carbon (POC),microbial biomass carbon (MBC),dissolved organic carbon (DOC),and soil properties were analyzed.The results showed that the SOC,ROC,and POC contents increased with acid treatment.However,simulated acid rain restrained the activity of microorganism while the SMBC content showed the opposite trend.The analysis showed that ROC333 and POC with SOC had highly significant correlations,with correlation coefficients of 0.853 and 0.846 respectively.Our results also indicated a significant correlation between other labile fractions and the SOC.The value of L and LI decreased with the progressive succession of forests while the rangeability of L and LI showed the same trend.It's indicated the proportion of labile portion to non-labile portion decreased.The results also showed CPI and CMI increased with the progressive succession of forests and,thus,the BF soil pool was more stable.That's due to BF soil has higher C sequestration and lower lability than MF and PF forests,so the carbon is easily to sequestrate and more stable if the carbon lability index decreased.Moreover,the LI was more sensitive than the carbon cool index (CPI) was.From the variation of indicators of the three forests,we can conclude that the response sensitivity of acid rain showed an increasing trend with the progressive succession of forests.All the parameters investigated showed the following order of decreasing sensitivity:CMI ＞ R333 ＞ POC ＞ SMBC ＞ R 167 ＞ R33 ＞ LI ＞ DOC ＞ CPI ＞ SOC.关键词
模拟酸雨/活性有机碳/总有机碳/碳库管理指数/不同演替阶段森林Key words
simulated acid rain/labile organic carbon/soil organic carbon/carbon management index/forests at different successional stages引用本文复制引用
张慧玲,吴建平,熊鑫,褚国伟,周国逸,张德强..南亚热带森林土壤碳库稳定性与碳库管理指数对模拟酸雨的响应[J].生态学报,2018,38(2):657-667,11.基金项目
国家自然科学基金项目(41573077,31428001,41430529) （41573077,31428001,41430529）
中国科学院前言科学重点研究项目(QYZDJ-SSW-DQC003) （QYZDJ-SSW-DQC003）
