rice production achieving CO2 benefits …

The Impacts of Elevated CO2 on Paddy Ecosystem C and N Status (21 July 2015)
A five-year FACE study of rice production in a paddy field in China reveals a host of both real-time and future benefits of atmospheric CO2 enrichment…

There is a marked increase in production of all cropping species with elevated CO2, This paper now finds overall paddy field benefits now and into the future.

Writing in the Journal of Environmental Sciences, Guo et al. (2015) note that “elevated CO2 can stimulate wetland carbon (C) and nitrogen (N) exports through gaseous and dissolved pathways,” but they say that “the consequent influences on the C and N pools are still not fully known.” And in light of this fact, they set up a free-air CO2 enrichment or FACE experiment in a paddy field in Eastern China, where — after five years of CO2 fumigation to 200 ppm above the normal ambient CO2 concentration — they studied the status of C and N in the entire plant-water-soil system.

This work revealed, as the four Chinese researchers report, that (1) “elevated CO2 stimulated rice aboveground biomass and nitrogen accumulation by 19.1% and 12.5%, respectively” (see figure below), that (2) “elevated CO2 significantly increased paddy soil total organic carbon (TOC) and total nitrogen (TN) contents by 19.1% and 12.5% , respectively, in the 0-15 cm layer, and 22.7% and 26.0% in the 15-30 cm soil layer,” that (3) “averaged across the rice growing period, elevated CO2 greatly increased TOC and TN contents in the surface water by 7.6% and 11.4%, respectively,” and that (4) “the TOC/TN ratio and natural δ15N value in the surface soil showed a decreasing trend under elevated CO2,” while adding that “the above results indicate that elevated CO2 can benefit C and N accumulation in paddy fields.”


Aboveground biomass and N accumulation of rice plants growning under elevated CO2 (FACE) and ambient CO2 conditions.

Last of all, Guo et al. write that “given the similarity between the paddies and natural wetlands, our results also suggest a great potential for long-term C and N accumulation in natural wetlands under future climate patterns,” which is another significant boon for the biosphere that results from historical and still-ongoing anthropogenic CO2 emissions to the atmosphere.

Sugar cane too, loving the heat and extra CO2. Sugarcane [Saccharum officinarum]:

Vu and Allen (2009)

Stem juice production of well watered and fertilized plants (cv. CP88-1508, flood tolerant) grown from stalk cuttings for three months in paired-companion, temperature-gradient, sunlit greenhouses at an air temperature of 6.0°C higher than outside ambient air temperature
78%

Very good reaction with corn to elevated CO2 and water stress, Corn [Zea mays]:

Manderscheid et al. (2014)

Plants grown from seed to maturity out-of-doors under insufficient (DRY) soil moisture conditions in a FACE study
42%

 

 

Manderscheid et al. (2014)

Grain biomass of plants grown from seed to maturity out-of-doors under insufficient (DRY) soil moisture conditions in a FACE study
72%

About Tom Harley

Amateur ecologist and horticulturalist and CEO of Kimberley Environmental Horticulture Inc. (Tom Harley)
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One Response to rice production achieving CO2 benefits …

  1. Pingback: carbon shock … burn more coal to save the planet | pindanpost

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