高CO<sub>2</sub>浓度下羊草对土壤干旱胁迫的响应

高CO₂浓度下羊草对土壤干旱胁迫的响应

摘要

摘要:在高CO ₂浓度下羊草对土壤干旱胁迫响应的人工模拟试验分析表明，C0 ₂浓度升高对羊草具有“施肥”效应，羊草生物量增加20％以上，光合速率提高50％左右，气孔阻力增大，蒸腾速率下降，水分利用效率提高，土壤干旱胁迫对羊草的影响为负效应，与此相反，高CO ₂浓度下发生土壤干旱胁迫一定程度抑制了C0 ₂的施肥效应.

Abstract:The“applying fertilizer”effects of C0 ₂enrichment on Aneurolepidium chinenseare analyzed by using artificial simulation experiment．The results show that when the biomass is increased by above 20％．the photosynthesis rate is increased by about 50％，at the same time，stoma resistance enhanced，transpiration rate decreased and water use efficient heightened．The impacts of soil drought stress on Aneurolepidium chinenseare negative，it is just opposite compared with C0 ₂enrichment．The soil drought stress restrains the“applying fertilizer”effect on some degree under high CO ₂concentration．