摘要
以我国北亚热带地区退化灌木林改造11 a后形成的木荷-青冈栎混交林和杜英纯林为研究对象,并以保留的退化灌木林为对照,分析了不同树种组成对林分土壤活性有机碳含量的影响。结果表明:木荷-青冈栎混交林和杜英纯林0 50 cm各土层土壤有机碳含量比退化灌木林分别增加了52.33%96.13%和77.93%119.85%,土壤易氧化碳增加了57.89%100.90%和21.44%46.85%,土壤轻组有机质增加了74.50%93.75%和27.24%96.09%,而土壤水溶性有机碳变化不明显。不同树种组成林分土壤活性有机碳占土壤总有机碳的比率大小顺序,土壤水溶性有机碳/土壤总有机碳为退化灌木林>木荷-青冈栎混交林>杜英纯林,土壤易氧化碳/土壤总有机碳为木荷-青冈栎混交林>退化灌木林>杜英纯林。3种林分土壤各活性有机碳与土壤总有机碳的相关性均达到极显著水平(p<0.01),其中,木荷-青冈栎混交林相关系数大于其它两种林分。3种林分中,土壤总有机碳、易氧化碳、轻组有机质与土壤养分的相关性均达到极显著水平,而退化灌木林土壤水溶性有机碳与水解氮、速效钾相关性不显著,杜英纯林土壤水溶性有机碳与速效钾也无显著相关性。
Taking Schima superba-Cyclobalanpsis glauca mixed stand （SP） and Elaeocarpus sylvestris pure stand （EP） （ both were transformed from degraded shrub forest （DF） ） in north subtropical areas of China as test objects, the effects of different species composition on the labile organic carbon contents in 0 - 50 cm soil depth were analyzed. As compared with the retained DF, the soil total organic carbon （TOC）, easily-oxidized carbon （EOC） and light fraction organic matter （LFOM） in both SP and EP stands increased by 52.33% -96.13% and 77.93% - 119.85%, 57.89% - 100.90% and 21.44% - 46.85%, 74.50% - 93.75% and 27.24% - 96.09%, respectively. No obvious change in water-soluble organic carbon （WSOC） was observed after reforestation. The ratios of WSOC/TOC in the soils followed the order of DF 〉 SP 〉 EP, whereas the EOC/TOC in the soils followed the order of SP 〉 DF 〉 EP. In the three stands, the soil WSOC, EOC, and LFOC had extremely significant correlations with soil TOC （p 〈 0.01 ） , and the correlation coefficients of each labile organic carbon with soil TOC were higher in SP than in DF and EP. The soil TOC, EOC and LFOC in the three stands were extremely significantly correlated with soil nutrients, but the soil WSOC had no significant correlations with soil hydrolysable N and available K in DF, all the same, there was no significant correlation between soil WSOC and available K in EP
出处
《林业科学研究》
CSCD
北大核心
2015年第1期101-108,共8页
Forest Research
基金
浙江省重点科技创新团队项目(2010R50030)
浙江省自然科学基金项目(LY12C03012)
关键词
退化灌木林
树种组成
活性有机碳
轻组有机质
degraded shrub forest
species composition
soil labile organic carbon
light fraction organic matter
