globalchange  > 气候变化与战略
CSCD记录号: CSCD:5154738
论文题名:
亚热带杉木和米老排人工林土壤呼吸对凋落物去除和交换的响应
其他题名: Contrasting responses of soil respiration to litter manipulation in subtropical Mytilaria laosensis and Cunninghamia lanceolata plantations
作者: 余再鹏1; 万晓华1; 胡振宏1; 王民煌1; 刘瑞强1; 郑璐嘉1; 何宗明2; 黄志群1
刊名: 生态学报
ISSN: 1000-0933
出版年: 2014
卷: 34, 期:10, 页码:1107-1113
语种: 中文
中文关键词: 凋落物 ; 激发效应 ; 土壤呼吸 ; 土壤温度 ; 土壤微生物生物量 ; 树种
英文关键词: litter ; priming effect ; soil respiration ; soil temperature ; soil microbial biomass ; tree species
WOS学科分类: BIOLOGY
WOS研究方向: Life Sciences & Biomedicine - Other Topics
中文摘要: 在我国亚热带地区米老排(Mytilaria laosensis)和杉木(Cunninghamia lanceolata)人工林中设置去除凋落物、交换凋落物和对照3种处理,利用LI-8100对不同处理土壤呼吸速率进行为期14个月的连续观测。结果表明:与对照相比,去除和交换凋落物导致米老排人工林CO_2年排放量显著减少29.8%和14.2%,杉木人工林则分别减少6.1%和增加37.8%。两种林分交换凋落物处理产生了不同程度的激发效应,米老排凋落物相对于杉木凋落物具有更大的激发效应。不同处理土壤呼吸速率均与土壤温度呈显著指数关系,与土壤含水量呈负相关,土壤温度和含水量的回归模型可以分别解释米老排人工林中去除、交换和对照处理土壤呼吸速率的68.9%、77.0%和69.6%,杉木人工林的53.0%、36.2%和63.8%。两种林分不同处理土壤呼吸速率与土壤可溶性有机碳含量、微生物生物量碳含量以及主要微生物种群生物量显著相关。米老排人工林去除和交换凋落物处理均降低了土壤呼吸的温度敏感性Q_(10)值,而杉木林中仅去除凋落物降低了Q_(10)值。研究表明,土壤呼吸对凋落物输入方式改变的响应因树种而异,这种差异与凋落物输入的数量和质量及其对土壤易变性有机碳含量和微生物生物量的影响有关。
英文摘要: Future climate change is expected to alter the primary productivity of forest ecosystems, and thus potentially change the quality and quantity of aboveground litter inputs which could affect soil carbon emission and sequestration. A litter manipulation experiment was carried out in 19-year-old Mytilaria laosensis and Cunninghamia lanceolata plantations replanted in C. lanceolata woodland in subtropical China between January 2012 and February 2013. Three treatments including litter exclusion, reciprocal litter transplant and control were conducted within 2 m *2 m plots in randomized block design. Soil respiration rate (R_s) were measured monthly by Li-Cor 8100 and soil temperature and soil moisture were also monitored. The results showed that R_s subject to three treatments exhibited similar seasonal patterns in M. laosensis and C.lanceolata plots. The average R_s in litter exclusion, litter transplant and control treatments were 1.79, 2.18, 2.45mumol CO_2 m~(-2) s~(-1) in M.laosensis plots and 1.77, 2.29, 1.90mumol CO_2 m~(-2) s~(-1) in C.lanceolata plots, respectively. Overall, litter exclusion and transplant significantly decreased the annual fluxes under M. laosensis plots by 29. 8% and 14. 2%, respectively. Litter exclusion caused a slight decline in annual flux but litter transplant markedly increased the annual flux by 37. 8% in C.lanceolata plots. Using the decay constants of the two litter species in a reciprocal litter transplant decomposition experiment, priming effects were calculated as the amount of litter-derived respiration minus decomposed carbon from litter. Results showed that M.laosensis litter aroused higher priming effect than C.lanceolata litter, suggesting that the quantity and quality of litter input caused by different tree species could result in different below-ground responses. Correlations showed that R_s were exponentially correlated with the soil temperature and negatively correlated with the soil moisture under both M.laosensis and C.lanceolata plots. Non-liner regressions of soil temperature and soil moisture together accounted for 68.9%-77.0% and 36.2%-63.8% of monthly variation in soil respiration in M.laosensis and C.lanceolata plots, respectively, indicating that other factors were responsible for interpreting variations in R_s. The average R_s was significantly correlated to soil dissolved organic carbon concentration (P = 0. 019) and microbial biomass carbon concentration (P =0.037), which suggests that litter manipulation induced changes in soil labile carbon caused significant effects on R_s. A one time-point measured soil PLFA profiles showed that the average R_s was significantly correlated with the biomass of main signature PLFAs such as fungi (18:1 w9c, 18:2 w6,9c), which may imply that the high quality of litter input could alter soil microbial biomass and thus affect R_s. The temperature sensitivity (Q_(10)) of R_s decreased to 1.86 and 2*05 in the litter exclusion and transplant plots compared to 2.14 in the control plots under M. laosensis plantations. However, the Q_(10) in the litter exclusion, litter transplanting and control plots were 1.40, 1.52 and 1.52 in C. lanceolata plantations, respectively, which are lower than other studies in subtropical China. In summary, we concluded that the effects of litter manipulation on R_s were dependent on tree species, the contributions of litter to R_s.can be attributed to the quantity and quality of litter input, the changes in soil labile carbon and soil microbial biomass in subtropical forest plantations.
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/148231
Appears in Collections:气候变化与战略

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作者单位: 1.福建师范大学地理科学学院, 湿润亚热带山地生态国家重点实验室培育基地, 福州, 福建 350007, 中国
2.福建农林大学林学院, 福州, 福建 350002, 中国

Recommended Citation:
余再鹏,万晓华,胡振宏,等. 亚热带杉木和米老排人工林土壤呼吸对凋落物去除和交换的响应[J]. 生态学报,2014-01-01,34(10):1107-1113
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