CO2 Science

Plant Dry Weight (Biomass) 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
Hairgrass, Wavy [Deschampsia flexuosa]	1	19%	0%
Hairy Bracken [Pteridium revolutum]	3	49%	7.4%
Hayfield Tarweed [Hemizonia congesta]	2	48.5%	10.3%
Heath, Crossleaf [Erica tetralix]	4	23.8%	10.5%
Heather [Calluna vulgaris]	9	17.1%	5.4%
Hedera helix [English Ivy]	3	66%	10.6%	4	29.8%	2.4%	2	25%	7.8%
Helianthemum nummularium [Sun Rose]	1	0%	0%
Helianthus annus [Sunflower]	31	42.5%	4.7%	4	31.8%	14.6%	5	70.2%	27.4%
Hellroot [Orobanche minor]	1	0%	0%
Helxine soleirolii				2	31.5%	3.2%
Hemigraphis alternata [Red Ivy]							1	-9%	0%
Hemizonia congesta [Hayfield Tarweed]	2	48.5%	10.3%
Hemlock, Eastern [Tsuga canadensis]	3	34%	4.5%
Hemlock, Poison [Conium maculatum]	1	21%	0%
Herb, Perennial [Wedelia chinensis]	2	47.5%	0.4%
Heterosigma akashiwo [A Marine Raphidophyte]	2	15%	2.1%
Heterotheca subaxillaris [Camphorweed]	1	20%	0%
Hibiscus sabdariffa [Roselle]	1	235%	0%
Hilograss [Paspalum conjugatum]	1	18%	0%
Hippeastrum [Amaryllis]				2	15%	1.4%
Hippophae gyantsensis [Chinese Seabuckthorn]	1	55%	0%
Hippophae rhamnoides [Common Seabuckthorn]	1	23%	0%
Hizikia fusiforme [Hiziki (Brown Seaweed)]	1	45%	0%
Hiziki (Brown Seaweed) [Hizikia fusiforme]	1	45%	0%
Holcus lanatus [Common Velvetgrass]	11	38.5%	10.4%
Hordeum vulagare [Barley]	84	40.3%	4.3%	4	50.8%	16.4%	3	38%	14.1%
Hydrilla verticillata [Water Thyme]	7	21.9%	3.3%
Hylocereus undatus [Red Pitaya]				3	13%	2.9%
Hymenocallis littoralis [Spider Lily]	2	52%	2.8%
Hyparrhenia rufa [Jaragua]	2	33.5%	1.8%
Hypericum perforatum [St. John's Wort]	12	39.7%	10.2%	1	107%	0%	3	32%	0%
Hypnea spinella [Red Seaweed]	1	66%	0%				1	46%	0%
Hyptis suaveolens [Wild Spikenard]	1	1720%	0%

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