Implications of premature needle abscission to the elemental nutrient status and nutrient retranslocation patterns of ozone injured Jeffrey pine
- UCLA, Los Angeles, CA (United States)
The foliar nutrient relations of ozone stressed Jeffrey pine growing in the southern Sierra Nevada of California was compared in trees retaining different numbers of needle cohorts. A 20% reduction in foliar nitrogen occurred in the oldest needles of both sensitive trees (retaining two years of needles) and resistant trees (retaining five years of needles) which coincided with the flush of new needles in late June. Nitrogen content of recently expanded needles on sensitive trees was 15% lower than needles of similar age on resistant trees immediately after becoming fully expanded, but was not significantly different two months after expansion. Resistant trees retranslocated higher fractions of all phloem-mobile nutrients measured (N, K, P and Mg) although the differences were small (between 3 and 9%). The smaller foliar pool of nutrients resulting from premature abscission may result in ozone sensitive trees relying more heavily on soil supplies for both short and long term nutrient requirements.
- OSTI ID:
- 6396591
- Report Number(s):
- CONF-930798-; CODEN: BECLAG
- Journal Information:
- Bulletin of the Ecological Society of America; (United States), Vol. 74:2; Conference: 78. annual Ecological Society of America (ESA) meeting, Madison, WI (United States), 31 Jul - 4 Aug 1993; ISSN 0012-9623
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
LEAVES
NUTRIENTS
OZONE
BIOLOGICAL EFFECTS
PINES
BIOLOGICAL ADAPTATION
CALIFORNIA
FOLIAR UPTAKE
NITROGEN
CONIFERS
DEVELOPED COUNTRIES
ELEMENTS
NONMETALS
NORTH AMERICA
PINOPHYTA
PLANTS
TREES
UPTAKE
USA
560300* - Chemicals Metabolism & Toxicology