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Soil Science Society of America Journal Abstract - SOIL BIOLOGY & BIOCHEMISTRY

Soil Respiration under Maize Crops: Effects of Water, Temperature, and Nitrogen Fertilization

 

This article in SSSAJ

  1. Vol. 71 No. 3, p. 944-951
     
    Received: Apr 14, 2006


    * Corresponding author(s): wxding@mail.issas.ac.cn
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doi:10.2136/sssaj2006.0160
  1. Weixin Ding *a,
  2. Yan Caia,
  3. Zucong Caia,
  4. Kazuyuki Yagib and
  5. Xunhua Zhengc
  1. a State Key Lab. of Soil and Sustainable Agriculture, Inst. of Soil Science Chinese Academy of Sciences, Nanjing 210008, China
    b National Inst. for Agro-Environmental Sciences, Tsukuba, Ibaraki 305-8604, Japan
    c Inst. of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China

Abstract

To evaluate the response of soil respiration to soil moisture, temperature, and N fertilization, and estimate the contribution of soil and rhizosphere respiration to total soil CO2 emissions, a field experiment was conducted in the Fengqiu State Key Agro-Ecological Experimental Station, Henan, China. The experiment included four treatments: bare soil fertilized with 150 kg N ha−1 (CK), and maize (Zea mays L.)-cropped soils amended with 0 (N0), 150 (N150), and 250 (N250) kg N ha−1 Mean seasonal soil CO2 emissions in the CK, N0, N150, and N250 treatments were estimated to be 294, 598, 541, and 539 g C m−2, respectively. The seasonal soil CO2 fluxes were significantly affected by soil temperature, with the change in the rate of flux for each 10°C increase in temperature (Q 10) of 1.90 to 2.88, but not by soil moisture. Nitrogen fertilization resulted in a 10.5% reduction in soil CO2 flux; however, it did not significantly increase the maize aboveground biomass but did increase maize yield. Soil respiration measurement using the root-exclusion technique indicated that soils fertilized with 150 kg N ha−1 contributed 54% of the total soil CO2 emission, or 8% of soil organic C down to a depth of 40 cm. An amount of C equivalent to 26% of the net assimilated C in harvested above- and belowground plant biomass was returned to the atmosphere by rhizosphere respiration.

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