科尔沁沙地玉米（Zea mays）田垄上和垄间土壤呼吸比较

doi:10.7522/j.issn.1000-694X.2013.00328

摘要/Abstract

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（R_S）、异养呼吸（R_H）和自养呼吸（R_A）的温度敏感性指数Q₁₀大小顺序为：R_A（4.35）>R_S（3.10）>R_H（2.08）。（3） R_S和R_H之间存在显著差异，R_A与R_S和R_H之间不存在显著差异；R_A占R_S比例的季节变化范围为28.1%~71.1%，生长季R_H和R_A占R_S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。

关键词: 垄上, 垄间, 自养呼吸, 异养呼吸, Q₁₀, 生物量, 碳平衡

Abstract: 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 R_S, R_H, and R_A were 4.35, 3.10 and 2.08, respectively. (3) There was a significant difference between R_S and R_H, but there was no significant difference between R_A and R_S as well as R_A and R_H. The proportion of R_A to total soil CO₂ emission ranged from 28.1% to 71.1% during the growing season, and the average proportion of R_H and R_A to R_S 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.

Key words: rows, inter-row, autotrophic respiration, heterotrophic respiration, Q₁₀, biomass, carbon balance

中图分类号:

S154.1

张风霞, 韩娟娟, 陈银萍, 李玉强, 连杰, 岳祥飞, 王新源. 科尔沁沙地玉米（Zea mays）田垄上和垄间土壤呼吸比较[J]. 中国沙漠, 2014, 34(2): 378-384.

Zhang Fengxia, Han Juanjuan, Chen Yinping, Li Yuqiang, Lian Jie, Yue Xiangfei, Wang Xinyuan. Comparison of Soil Respiration Rate between Row and Inter-row of Maize (Zea mays) Field in the Horqin Sandy Land[J]. JOURNAL OF DESERT RESEARCH, 2014, 34(2): 378-384.

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