生态学报2018，Vol.38Issue(4)：1194-1202,9.DOI:10.5846/stxb201701110086
帽儿山不同年龄森林土壤呼吸速率的影响因子
Factors affecting soil respiration in stands of different ages in the Maoershan region, Northeast China
摘要
Abstract
Soil respiration (RS) is the major source of CO2 efflux to the atmosphere from forest ecosystems.It plays an important role in the carbon balance of the ecosystems.The temperate forests in Northeast China are a mosaic of different aged stands resulting from various logging disturbances.The objective of the present study was to examine variations in RS and its driving factors as the forests recovered from clear cutting with a chronosequence approach.The chronosequence that included stands of four ages (i.e.,1,10,25,and 56 years since logging) was established in 2014 in the Maoershan region,Northeast China (45°24′ N,127°40′ E).The RS was measured with a LI-840 CO2/H2O analyzer from April 2014 to March 2015;and the soil temperature and water content at a depth of 5cm were measured simultaneously.Soil organic carbon (SOC) and fine root (diameter ＜ 0.5mm) biomass were also measured at the end of the growing season.The results showed that:(1) the annual RS differed significantly among the stands (P＜0.05),and averaged 686.5,639.7,733.3,and 762.3g C m-2 · a-1 for the 1-,10-,25-,and 56-year old stands,respectively.The RS in the growing and non-growing seasons differed significantly among the stands.It showed a decreasing trend immediately after the clear cutting,and subsequently increased with increasing the stand age.The coefficients of variation in RS among the stands were 7.6％,6.3％,and 21.1％ for the whole year,growing season,and non-growing season,respectively,suggesting that the variability in the RS among stands in the non-growing season amplified the variation in the annual RS.(2) The RS of all the stands followed a similar seasonal trend,but the controlling factors varied with seasons.The RS between June and August was significantly related with soil water content in a polynomial function (R2 =56％-79％),whereas the RS during the rest months was significantly related with soil temperature in an exponential function (R2=85％-93％).(3) The RS in the growing season was correlated positively with SOC content at a depth of 0-20cm in all the stands (R2 =0.434,P＜0.05),whereas that in the non-growing season was correlated positively with soil temperature at a depth of 5cm in the same season (R2 =0.959,P＜0.01).These results suggest that the RS in these forests decrease after logging disturbance and increase with increasing the stand age,driven mainly by the increased SOC content and changes in soil temperature during the non-growing season.关键词
季节变化/年龄序列/驱动因子/森林采伐/土壤呼吸/森林恢复Key words
seasonal change/chronosequence/driving factor/logging/soil respiration/forest restoration引用本文复制引用
王家骏,王传宽,韩轶..帽儿山不同年龄森林土壤呼吸速率的影响因子[J].生态学报,2018,38(4):1194-1202,9.基金项目
中国科学院野外站联盟项目(KFJ-SW-YW026) （KFJ-SW-YW026）
教育部长江学者和创新团队发展计划(IRT_15R09) （IRT_15R09）
