期刊
CANADIAN JOURNAL OF BOTANY-REVUE CANADIENNE DE BOTANIQUE
卷 85, 期 11, 页码 1046-1057出版社
NATL RESEARCH COUNCIL CANADA-N R C RESEARCH PRESS
DOI: 10.1139/B07-062
关键词
drought stress; fertilization; N source; poplar; stable isotope; water-use efficiency
The objective of this study was to understand how nitrogen (N) source, soil pH, and drought interact in the growth and water-use efficiency of poplars. Rooted cuttings from two hybrid poplar clones, 24 (Walker) (Populus deltoides x Populus x petrowskyana), and 794 (Brooks 6) (Populus deltoides x Populus x petrowskyana), and one native balsam poplar clone 1004 (Populus balsamifera L.), were grown in a greenhouse for a period of 8 weeks. Trees received a combination of two N sources (ammonium sulphate [(NH4)(2)SO4] and calcium nitrate [Ca(NO3)(2)]), two soil pHs (5 and 7), and two drought levels (85% and 40% field capacity, as determined by mass). Trees had reduced growth, net photosynthesis, and stomata] conductance with NO3- fertilization, and these effects were accentuated at soil pH 7. The drought treatment only slightly reduced growth and rarely interacted with N source or soil pH. Drought also did not affect instantaneous measurements of water-use efficiency, but it increased delta C-13 by an average of 0.55 parts per thousand. The poplar clones used in this study appear to be better adapted to take up N from NH4+ than from NO3 =N sources.
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