Titlebook: Belowground Responses to Rising Atmospheric CO2: Implications for Plants, Soil Biota, and Ecosystem ; Proceedings of a wor Peter S. Curtis,

CHASM

Industry, Innovation and Infrastructureoarse and fine roots in nitrogen and phosphorus uptake from soils, the respiratory costs associated with this acquisition of nutrients, and the significance of root architecture in these relationships. Another example focuses on a conceptual model that has helped raise new ideas about the effects of

Corral

Crohns-disease

Root response to CO2 enrichment and nitrogen supply in loblolly pineatment and lower in the low N treatment. We argue that N stress resulting from short exposures to nutrients might help explain the lower N concentrations observed at high CO. in other experiments; Nitrogen and CO. levels modified root morphology. High N increased the number of secondary lateral root

NEEDY

Inclement

CHART

Soil microbial response in tallgrass prairie to elevated CO2t upon soil water conditions. In 1991, a dry year, CO. enrichment significantly increased microbial biomass C and N. In 1992, a wet year, microbial biomass C and N were unaffected by the CO. treatments. Added N increased microbial C and N under CO. enrichment. Microbial activity was consistently gre

Adulterate

The response of mycorrhizal colonization to elevated CO, and climate change in , and ,annual precipitation decreased colonization in both species. Simulated climate change conditions of elevated CO., elevated temperature and lowered precipitation decreased colonization in . but had less effect on .. After four growth cycles in ., trends of treatments remained similar, but overall col

幼稚

Effect of elevated CO, on mycorrhizal colonization of loblolly pine (, L.) seedlingss stress decreased root starch concentrations, increased root sugar concentrations and did not significantly affect TNC concentrations. However, despite significant effects on root carbohydrate levels, there were generally no significant treatment effects on mycorrhizal colonization. Additionally, a

侵略者

Biomass production in a nitrogen-fertilized, tallgrass prairie ecosystem exposed to ambient and elevd in 1991, a dry year, and belowground in 1990, a wet year. Nitrogen concentration was lower in plants exposed to elevated CO., but total standing crop N was greater at high CO.. Increased root biomass under elevated CO. apparently increased N uptake. The biomass production response to elevated CO.

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