科尔沁沙地玉米(Zea mays)田垄上和垄间土壤呼吸比较  

Comparison of Soil Respiration Rate between Row and Inter-row of Maize(Zea mays)Field in the Horqin Sandy Land

作　　者：张风霞[1] 韩娟娟[2] 陈银萍[1] 李玉强[2] 连杰[2] 岳祥飞[2] 王新源[2] 

机构地区：[1]兰州交通大学环境与市政工程学院,甘肃兰州730070 [2]中国科学院寒区旱区环境与工程研究所,甘肃兰州730000

出　　处：《中国沙漠》2014年第2期378-384,共7页Journal of Desert Research

基　　金：国家自然科学基金项目(31170413;41271007);国家科技支撑计划项目(2011BAC07B02)资助

摘　　要：采用动态密闭气室法测定分析了科尔沁沙地典型玉米（Zea mays）农田垄上和垄间土壤呼吸速率的差异及自养和异养呼吸特征，并估算了生态系统碳平衡。结果表明：（1） 垄上和垄间土壤呼吸速率存在极显著差异（p〈0.001），且存在线性关系（p〈0.05）；季节水平上垄上土壤呼吸可解释垄间土壤呼吸98.4%的变异。（2） 季节水平上土壤总呼吸（RS）、异养呼吸（RH）和自养呼吸（RA）的温度敏感性指数Q10大小顺序为：RA（4.35）〉RS（3.10）〉RH（2.08）。（3） RS和RH之间存在显著差异，RA与RS和RH之间不存在显著差异；RA占RS比例的季节变化范围为28.1%~71.1%，生长季RH和RA占RS的比例均值分别为44.4%和55.6%。（4） 科尔沁沙地典型农田生态系统在生长季为碳汇，可净固存大气CO2-C的量为659.1 g·m-2。Using an infrared gas analysis method （IRGA） CO2 analyzer （Li-6400,USA）, the present study explored the differences of soil respiration rate between row and inter-rows and the characteristics of the autotrophic and heterotrophic respiration at maize （Zea mays ） fields of Horqin Sandy Land, and then estimated the carbon balance of ecosystem. Results showed that： （1） There was significant difference of soil respiration rate between row and inter-rows （p〈0.001）, and there was a linear relationship between them （p〈0.05）; Approximately 98.4% （R2=0.984） variations in soil respiration of inter-rows could be explained by that of row. （2） The Q10 values for RS, RH, and RA were 4.35, 3.10 and 2.08, respectively. （3） There was a significant difference between RS and RH, but there was no significant difference between RA and RS as well as RA and RH. The proportion of RA to total soil CO2 emission ranged from 28.1% to 71.1% during the growing season, and the average proportion of RH and RA to RS were 44.4% and 55.6%, respectively. （4） Maize field of Horqin Sandy Land was a carbon sink in the growth period, which could sequester carbon up to 659.1 gC·m-2.

关 键 词：垄上 垄间 自养呼吸 异养呼吸 Q10 生物量 碳平衡 

分 类 号：S154.1[农业科学—土壤学]