| 不同耕作方式下土壤水分状况对土壤呼吸的初期影响 |
| 摘要点击 2431 全文点击 1063 投稿时间：2015-06-25 修订日期：2015-11-04 |
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| 中文关键词 耕作方式 土壤水分 土壤呼吸 CO2排放通量 拟合方程 |
| 英文关键词 tillage practices soil moisture soil respiration carbon dioxide fluxes fitting equation |
| 作者 | 单位 | E-mail | | 张延 | 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 | zhangyan13@mails.ucas.ac.cn | | 梁爱珍 | 中国科学院东北地理与农业生态研究所, 长春 130102 | liangaizhen@iga.ac.cn | | 张晓平 | 中国科学院东北地理与农业生态研究所, 长春 130102 | | | 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 | | | 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 | | | 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 | |
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| 中文摘要 |
| 以2001年在东北典型黑土上进行的保护性耕作长期定位试验下免耕、垄作及常规耕作土壤进行了室内培养实验,按照田间持水量(water-holding capacity, WHC)的30%、60%、90%、120%、150%、180%、210%、240%、270%设定了9个水分梯度,并分别对其二氧化碳(CO2)排放量进行了22 d的短期观测,以研究不同耕作方式下土壤水分状况对土壤呼吸的初期影响. 结果表明:①干土条件下在加水培养初期,3种耕作方式均产生了明显的激发效应,并且土壤呼吸速率与土壤含水量间存在正相关关系. ②除干旱(30%WHC)及淹水(240%WHC、270%WHC)条件下,3种耕作方式CO2排放通量分别为免耕 >垄作 >常规耕作. ③对不同耕作方式下土壤水分状况及CO2排放通量进行了方程拟合,在30%~270%WHC条件下,免耕的CO2排放通量与水分状况拟合为二次回归方程,而垄作与常规耕作则是线性回归方程. 在30%~210%WHC条件下,免耕与垄作下土壤CO2排放通量与水分状况均可拟合为较好的对数方程,可决系数R2分别为0.966、0.956. |
| 英文摘要 |
| In the early stage of an incubation experiment, soil respiration has a sensitive response to different levels of soil moisture. To investigate the effects of soil moisture on soil respiration under different tillage practices, we designed an incubation trial using air-dried soil samples collected from tillage experiment station established on black soils in 2001. The tillage experiment consisted of no-tillage (NT), ridge tillage (RT), and conventional tillage (CT). According to field capacity (water-holding capacity, WHC), we set nine moisture levels including 30%, 60%, 90%, 120%, 150%, 180%, 210%, 240%, 270%WHC. During the 22-day short-term incubation, soil CO2 emission was measured. In the early stage of incubation, the priming effects occurred under all tillage practices. There were positive correlations between soil respiration and soil moisture. In addition to drought and flood conditions, soil CO2 fluxes followed the order of NT > RT > CT. We fitted the relationship between soil moisture and soil CO2 fluxes under different tillage practices. In the range of 30%-270% WHC, soil CO2 fluxes and soil moisture fitted a quadratic regression equation under NT, and linear regression equations under RT and CT. Under the conditions of 30%-210% WHC of both NT and RT, soil CO2 fluxes and soil moisture were well fitted by the logarithmic equation with fitting coefficient R2=0.966 and 0.956, respectively. |
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