[Effects of drip irrigation with plastic mulching on the net primary productivity, soil heterotrophic respiration, and net CO2 exchange flux of cotton field ecosystem in Xinjiang, Northwest China].
In April-October, 2009, a field experiment was conducted to study the effects of drip irrigation with plastic mulching (MD) on the net primary productivity (NPP), soil heterotrophic respiration (Rh) , and net CO2 exchange flux (NEF(CO2)) of cotton field ecosystem in Xinjiang, taking the traditional flood irrigation with no mulching (NF) as the control. With the increasing time, the NPP, Rh, and NEF(CO2) in treatments MD and NF all presented a trend of increasing first and decreased then. As compared with NF, MD increased the aboveground and belowground biomass and the NPP of cotton, and decreased the Rh. Over the whole growth period, the Rh in treatment MD (214 g C x m(-2)) was smaller than that in treatment NF (317 g C x m(-2)), but the NEF(CO2) in treatment MD (1030 g C x m(-2)) was higher than that in treatment NF (649 g C x m(-2)). Treatment MD could fix the atmospheric CO2 approximately 479 g C x m(-2) higher than treatment NF. Drip irrigation with plastic mulching could promote crop productivity while decreasing soil CO2 emission, being an important agricultural measure for the carbon sequestration and emission reduction of cropland ecosystems in arid area.
State Key Laboratory of Desert and Oasis Ecology/Fukang Station of Desert Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China. Lzg250@126.com
Zhi-Guo
ZG
Li
Run-Hua
RH
Zhang
Dong-Mei
DM
Lai
Zheng-Yue
ZY
Yan
Li
L
Jiang
Chang-Yan
CY
Tian
D057914:Agricultural Irrigation / Q000379:methods*; D018533:Biomass; D002245:Carbon Dioxide / Q000032:analysis*; D019069:Cell Respiration; D002681:China; D017753:Ecosystem; D003368:Gossypium / Q000254:growth & development*; D052836:Heterotrophic Processes; D018517:Plant Roots / Q000166:cytology / Q000378:metabolism; D012987:Soil / Q000737:chemistry*
D012987:Soil; D002245:Carbon Dioxide