| 不同部位玉米秸秆对两种质地黑土CO2排放和微生物量的影响 |
| 摘要点击 4457 全文点击 1571 投稿时间：2014-11-23 修订日期：2015-01-29 |
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| 中文关键词 秸秆还田 木质素 碳氮比 土壤CO2排放 土壤微生物量 土壤固碳 |
| 英文关键词 straw amendments lignin C/N soil CO2 emission soil microbial biomass soil carbon sequestration |
| 作者 | 单位 | E-mail | | 刘四义 | 中国科学院东北地理与农业生态研究所, 长春 130102
中国科学院大学, 北京 100049 | wuhuliusyi@163.com | | 梁爱珍 | 中国科学院东北地理与农业生态研究所, 长春 130102 | | | 杨学明 | 加拿大农业与农业食品部温室与加工作物研究中心, 安大略 N0R 1G0 | | | 张晓平 | 中国科学院东北地理与农业生态研究所, 长春 130102 | zhangxiaoping@iga.ac.cn | | 贾淑霞 | 中国科学院东北地理与农业生态研究所, 长春 130102 | | | 陈学文 | 中国科学院东北地理与农业生态研究所, 长春 130102 | | | 张士秀 | 中国科学院东北地理与农业生态研究所, 长春 130102 | | | 孙冰洁 | 中国科学院东北地理与农业生态研究所, 长春 130102
中国科学院大学, 北京 100049 | | | 陈升龙 | 中国科学院东北地理与农业生态研究所, 长春 130102
中国科学院大学, 北京 100049 | |
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| 中文摘要 |
| 秸秆还田后作物残体的分解是农田生态系统碳循环及养分周转平衡的一个至关重要环节. 为了探索秸秆化学性质和土壤质地对黑土区土壤CO2排放和微生物量的影响,本文通过室内恒温培养实验研究了添加不同植株部位玉米秸秆(根、茎下部、茎顶部、叶)进入黑土区两种质地土壤(砂壤土和黏壤土)后的CO2排放、微生物量,并分析了它们与秸秆C/N、木质素含量的关系. 结果表明,添加不同部位秸秆一致增加土壤CO2排放量,激发效应值介于216.53~335.17μmol ·g-1,黏壤土大于砂壤土. 激发效应值与木质素/N之间的线性回归关系明显好于激发效应与木质素含量、C/N、含氮量之间的线性关系. 添加秸秆增加MBC和MBN含量,降低MBC/MBN,微生物群落氮固持的速率高于碳固持. 添加秸秆后,砂壤土微生物量增加的幅度大于黏壤土,总溶解性氮含量小于黏壤土. 结果说明,秸秆的木质素和氮含量均会对它的分解和CO2排放产生影响,木质素/N比木质素含量、C/N等更好地说明秸秆分解和CO2排放的差异; 与黏壤土相比,在砂壤土中实施秸秆还田可以取得更好的土壤碳固存、微生物量和氮素保持效果. |
| 英文摘要 |
| The decomposed rate of crop residues is a major determinant for carbon balance and nutrient cycling in agroecosystem. In this study, a constant temperature incubation study was conducted to evaluate CO2 emission and microbial biomass based on four different parts of corn straw (roots, lower stem, upper stem and leaves) and two soils with different textures (sandy loam and clay loam) from the black soil region. The relationships between soil CO2 emission, microbial biomass and the ratio of carbon (C) to nitrogen (N) and lignin of corn residues were analyzed by the linear regression. Results showed that the production of CO2 was increased with the addition of different parts of corn straw to soil, with the value of priming effect (PE) ranged from 215.53 μmol ·g-1 to 335.17 μmol ·g-1. Except for corn leaves, the cumulative CO2 production and PE of clay loam soil were significantly higher than those in sandy loam soil. The correlation of PE with lignin/N was obviously more significant than that with lignin concentration, nitrogen concentration and C/N of corn residue. The addition of corn straw to soil increased the contents of MBC and MBN and decreased MBC/MBN, which suggested that more nitrogen rather than carbon was conserved in microbial community. The augmenter of microbial biomass in sandy loam soil was greater than that in clay loam soil, but the total dissolved nitrogen was lower. Our results indicated that the differences in CO2 emission with the addition of residues to soils were primarily ascribe to the different lignin/N ratio in different corn parts; and the corn residues added into the sandy loam soil could enhance carbon sequestration, microbial biomass and nitrogen holding ability relative to clay loam soil. |
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