[Effects of simulated nitrogen deposition on soil respiration in a Neosinocalamus affinis plantation in rainy area of west China].
From December 2007 to November 2008, an in situ experiment was conducted to study the effects of simulated nitrogen deposition on the soil respiration in a Neosinocalamus affinis plantation in Rainy Area of West China. Four treatments were installed, i.e., 0 (CK), 50, 150, and 300 kg N x hm(-2) x a(-1), and soil respiration rate was measured by infrared gas analyzer. In the test plantation, soil respiration rate had a distinct seasonal fluctuation, with the highest (3.36 +/- 0.20 micromol x m(-2) x s(-1)) by the end of July and the lowest by the end of February (0.33 +/- 0.07 micromol x m(-2) x s(-1)). There was a significant exponential relationship (P<0.001) between soil respiration rate and soil temperature, and the temperature at 10 cm soil depth explained 91.6% of the seasonal change of soil respiration. However, less relationship was observed between soil respiration rate and soil moisture content (R2 = 0.0758). From June to November 2008, the contribution of root respiration to total soil respiration ranged from 46% to 59%. The annual release amount of CO2 in treatments 50, 150, and 300 kg x hm(-2) x a(-1) was 23.6% , 46.7%, and 50.5% lower than that in CK (2.17 x 10(4) kg x hm(-2)), and the Q10 value of soil respiration rate in treatments 0, 50, 150, and 300 kg x hm(-2) x a(-1) was 3.72, 3.51, 2.95, and 2.71, respectively.
Li
Ren-hong
RH
Sichuan Province Key Laboratory of Forestry Ecological Engineering, College of Forestry, Sichuan Agricultural University, Ya'an 625014, Sichuan, China. lirh_001@sina.com
Tu
Li-hua
LH
Hu
Ting-xing
TX
Zhang
Jian
J
Lu
Yang
Y
Liu
Wen-ting
WT
Luo
Shou-hua
SH
Xiang
Yuan-bin
YB
D031723:Bambusa / Q000254:growth & development*; D002245:Carbon Dioxide / Q000378:metabolism*; D002681:China; D003198:Computer Simulation; D017753:Ecosystem; D004785:Environmental Pollutants / Q000032:analysis*; D009584:Nitrogen / Q000032:analysis*; D018526:Plant Transpiration / Q000502:physiology; D011891:Rain; D012621:Seasons; D012987:Soil / Q000032:analysis*; D014867:Water / Q000378:metabolism
D004785:Environmental Pollutants; D012987:Soil; D014867:Water; D002245:Carbon Dioxide; D009584:Nitrogen