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Artemisia frigida and Stipa krylovii, two dominant species in Inner Mongolia steppe, differed in their responses to elevated atmospheric CO sub(2) concentration
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Artemisia frigida and Stipa krylovii, two dominant species in Inner Mongolia steppe, differed in their responses to elevated atmospheric CO sub(2) concentration
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Artemisia frigida and Stipa krylovii, two dominant species in Inner Mongolia steppe, differed in their responses to elevated atmospheric CO sub(2) concentration
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Journal Article
Artemisia frigida and Stipa krylovii, two dominant species in Inner Mongolia steppe, differed in their responses to elevated atmospheric CO sub(2) concentration
2016
Overview
Despite extensive studies on effects of elevated CO sub(2) concentration ([CO sub(2)] sub(e)) on plant growth, few studies have investigated the responses of native grassland plant species to [CO sub(2)] sub(e) in terms of nutrient acquisition. The effects of [CO sub(2)] sub(e) (769 plus or minus 23 ppm) on Artemisia frigida and Stipa krylovii, two dominant species in Inner Mongolia steppe were investigated by growing them for 7 weeks in Open-Top Chambers (OTC). Exposure to [CO sub(2)] sub(e) enhanced shoot and root growth of A. frigida and S. krylovii. Elevated [CO sub(2)] increased photosynthetic rates (Pn) by 34 % in A. frigida but decreased Pn by 52 % in S. krylovii. Moreover, root-secreted acid phosphatase activity in A. frigida was stimulated by [CO sub(2)] sub(e), while exudation of malate from roots of S. krylovii was suppressed by [CO sub(2)] sub(e). Exposure to [CO sub(2)] sub(e) led to a decrease in P concentration in shoots and roots of A. frigida and S. krylovii, but total amount of P accumulated in shoots and roots of both species was increased by [CO sub(2)] sub(e.) The two dominant species in temperate steppes differed in their responses to [CO sub(2)] sub(e), such that A. frigida was more adapted to [CO sub(2)] sub(e) than S. krylovii under low availability of soil P.
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