LI Yingchen,WANG Qibo,HOU Cuicui,et al.Effects of Different Corn Litter Components and Their Mixture Addition on Soil N2O Emission[J].Research of Soil and Water Conservation,2016,23(06):260-264.
玉米秸秆不同构件添加对土壤N2O排放的影响
- Title:
- Effects of Different Corn Litter Components and Their Mixture Addition on Soil N2O Emission
- Keywords:
- litter addition; mixture; N2O emission; litter decomposition; total N
- 分类号:
- S154.1;X511
- 摘要:
- 通过室内培养试验，研究玉米秸秆不同构件及按比例混合添加对土壤N2O排放的影响。试验设置无枯落物土壤对照（CK）及四种枯落物添加处理：茎+土壤（CKS）、叶+土壤（CKL）、鞘+土壤（CKLS）、混合枯落物（茎∶叶∶鞘=5∶3∶2）+土壤（CKM）。结果表明：培养初期添加枯落物对土壤N2O产生激发作用，培养6 d之后趋于稳定，但各添加枯落物处理高于对照；培养结束各添加不同构件及混合枯落物土壤N2O累积排放量都显著增加（p < 0.05），添加茎和混合枯落物土壤N2O排放量显著高于添加叶和鞘枯落物（p < 0.05）。枯落物混合对土壤N2O排放的影响在培养前期（10～28 d）有一定的促进作用，培养后期不同枯落物之间无相互作用。培养结束后各枯落物全氮含量显著高于初始值，C/N显著低于初始值（p < 0.05）。枯落物混合培养结束后剩余质量实测值低于预测值，全氮含量实测值高于预测值，枯落物碳氮比实测值低于预测值，土壤N2O累积排放量差异不显著，表明枯落物混合有利于枯落物分解和氮累积，但是对N2O累积排放影响不大。
- Abstract:
- The effects of different corn litter components and mixture addition on soil N2O emission were investigated via laboratory incubation. Five treatments were set in this experiment:soil with no litter addition (CK); soil with stalk litter addition (CKS); soil with leaf litter addition (CKL); soil with leaf sheath litter addition (CKLS); soil with mixed litter (stalk:leaf:leaf sheath=5:3:2) addition (CKM). The results showed that litter addition had a priming effect on N2O emission at the beginning of the incubation. N2O emission from the samples with litter addition was stable since the sixth day of the incubation period and was greater than that from CK samples. The cumulative N2O emission from samples with litter addition was significantly higher than that from CK samples (p<0.05), further, cumulative N2O emissions of CKS and CKM were significantly greater than those of CKL and CKLS (p<0.05). Litter mixing accelerated soil N2O emission to a certain extent at the first stage of incubation (10~28 days), however, there was no interaction among different kinds of litter at the last stage of the incubation. The total N contents of all residues in the end of the incubation were significantly greater than the initial contents; on the contrast, the ratio of C/N of the incubated residues was significantly less than the initial ratios (p<0.05). For the incubated samples of CKM, the mass were smaller than that predicted value, the total N content was greater than that predicted value; while the C/N ratio was smaller than that predicted value. However, there was no significant difference between observed and predicted soil cumulative N2O emissions. These results indicated that litter mixing accelerated the processes of litter decomposition and N accumulation, but had no significant effect on N2O emission.
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备注/Memo
收稿日期:2016-01-11;改回日期:2016-01-25。
基金项目:河南师范大学博士科研启动课题（qd12129，qd12126）；国际原子能机构合作项目（17680）；河南省教育厅科学技术研究重点项目（14B180008）；河南师范大学青年基金（2013qk09，2013qk13）
作者简介:李英臣(1982-),男,山东聊城人,博士,副教授.主要从事坡耕地温室气体排放研究。E-mail:xiayuchen211@163.com