CO2 Science

Plant Photosynthesis (Net CO2 Exchange Rate) Responses
to Atmospheric CO2 Enrichment
H

	300 ppm			600 ppm			900 ppm
Plant Name	Number of Studies	Arithmetic Mean	Standard Error	Number of Studies	Arithmetic Mean	Standard Error	Number of Studies	Arithmetic Mean	Standard Error
Heather [Calluna vulgaris]	20	114.5%	48.5%
Hedera canariensis				1	35%	0%
Hedera helix [English Ivy]				1	41%	0%	4	57.3%	20.5%
Hedgehyssop, Golden [Gratiola aurea]				1	115%	0%
Helianthus annuus [Sunflower]	21	52.9%	6%	1	72%	0%
Helianthus petiolaris [Prairie Sunflower]	2	20%	0%
Herb, Perennial [Wedelia chinensis]	2	45.5%	6.7%
Herb, Tropical Rain Forest [Elatostema repens]	1	68%	0%
Heterotheca subaxillaris [Camphorweed]	1	17%	0%
Hevea brasiliensis [Rubber Tree]	8	85.9%	3.9%
Hibiscus, Chinese [Hibiscus rosa-sinensis]				2	12%	6.4%
Hibiscus rosa-sinensis [Chinese Hibiscus]				2	12%	6.4%
Hickory, Pignut [Carya glabra]	3	57.3%	22.8%
Hickory, Shagbark [Carya ovata]	1	35%	0%
Hippophae gyantsensis [Chinese Seabuckthorn]	1	153%	0%
Hippophae rhamnoides [Common Seabuckthorn]	1	58%	0%
Holcus lanatus [Common Velvetgrass]	1	85%	0%
Holly-Leaved Daisybush [Olearia ilicifolia]	1	79%	0%
Honduras Mahogany [Swietenia macrophylla]	1	26%	0%
Hordeum marinum [Sea Barley]	3	40.3%	7%
Hordeum vulagare [Barley]	28	52.2%	7.9%	2	32%	4.9%	1	39%	0%
Houseleek, Common [Sempervivum tectorum]
Hybrid Aspen [Populus tremula x populus tremuloides]	1	113%	0%
Hybrid Poplar [Populus tremula x alba]	1	23%	0%
Hylocereus undatus [Red Pitaya]				5	63%	9.8%
Hylocomium splendens [Splendid Feather Moss]	1	100%	0%	1	200%	0%
Hymenaea courbaril [Stinkingtoe]	1	70%	0%
Hyparrhenia rufa [Jaragua]	1	70%	0%
Hypericum perforatum [St. John's Wort]				1	116%	0%
Hypnea spinella [Red Seaweed]	1	32%	0%				1	37%	0%
Hypnum cupressiforme [Hypnum Moss]				2	122.5%	15.9%
Hyptis suaveolens [Wild Spikenard]	1	88%	0%

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