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| Web URL(s): | http://www.jstor.org/stable/pdf/10.2307/2260986.pdf
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http://www.jstor.org/stable/2260986
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Access conditions: Item is within a limited-access website |
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| Publication Type:
| Refereed |
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| Author(s): | Sisson, W. B. |
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| Author Affiliation: | Jornada Experimental Range USDA, Agricultural Research Service, Dept. of Animal and Range Sciences, New Mexico State University, Las Cruces, NM. |
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| Title: | Carbon Balance of Panicum coloratum During Drought and Non-Drought in the Northern Chihuahuan Desert |
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| Source: | Journal of Ecology. Vol. 77, No. 3, September 1989, p. 799-810. |
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| Publishing Information: | Blackwell Scientific Publications |
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| Keywords: | TIC Keywords: Panicum coloratum; Carbon; Drought; Photosynthesis; Respiration; Roots; Desert soils
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| Geographic Terms: | New Mexico |
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| Abstract/Contents: | "(1) The Daily CO2 flux of above-ground and below-ground components of Panicum coloratum growing in the northern Chihuahuan desert was determined during a spring drought and following the autumn reproductive phase of growth. The objectives were (i) to determine the whole-plant carbon balance after a fifty-two-day drought when photosynthetic capacity was severely repressed, and (ii) to determine the whole-plant carbon balance during favourable soil-water conditions prevalent after the autumn reproductive period. (2) Water stress severely repressed diurnal photosynthetic capacity during drought. The below-ground biomass, however, consisted of suberized roots with low respiratory activity. The net result was a positive whole-plant carbon gain of 2.6 mg C g dry wt-1 day-1. (3) Precipitation, amounting to 1.12 cm, ended the fifty-two-day drought, and increased the whole-plant carbon gain approximately six-fold. (4) The mean root/shoot quotient was 1.9 during the spring drought and 0.6 in the autumn. Reproductive tissue accounted for 13-34% (mean = 22%) of the above-ground biomass in the autumn. (5) Following reproductive growth, when soil-moisture conditions were favourable, the root system comprised suberized roots, non-suberized nodal roots and other non-suberized roots. Although the last two root types had high respiration rates, their presence in low quantities and low soil temperatures resulted in below-ground respiration approx. equal to that during drought. The whole-plant carbon gain during September was 17.2 mg C g dry wt-1 day-1." |
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| Language: | English |
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| References: | 25 |
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| Note: | Figures
Graphs |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Sisson, W. B. 1989. Carbon Balance of Panicum coloratum During Drought and Non-Drought in the Northern Chihuahuan Desert. J. Ecol. 77(3):p. 799-810. |
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| Web URL(s):
http://www.jstor.org/stable/pdf/10.2307/2260986.pdf
Last checked: 01/13/2016
Requires: PDF Reader
Access conditions: Item is within a limited-access website
http://www.jstor.org/stable/2260986
Last checked: 01/13/2016
Access conditions: Item is within a limited-access website |
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MSU catalog number: QH 540 .J6 |
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