کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4426760 1309135 2008 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Interactive effects of O3 exposure on California black oak (Quercus kelloggii Newb.) seedlings with and without N amendment
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم محیط زیست شیمی زیست محیطی
پیش نمایش صفحه اول مقاله
Interactive effects of O3 exposure on California black oak (Quercus kelloggii Newb.) seedlings with and without N amendment
چکیده انگلیسی

We examined the short-term separate and combined effects of simulated nitrogen (N) deposition (fertilization) and ozone (O3) exposure on California black oak seedlings (Quercus kelloggii Newb.), an ecologically important tree of the San Bernardino Mountains downwind of Los Angeles. Realistic concentrations of O3 were found to cause statistically and biologically significant negative effects on plant health, including lowered photosynthetic ability, lowered water use efficiency, and increased leaf chlorosis and necrosis. When subjected to abrupt changes in light levels, O3-exposed plants showed both a slower and smaller response than O3-free plants. Fertilized plants exhibited a significantly greater pre- to post-treatment decline in A at saturated [CO2] and a significantly lower level of post-treatment chlorosis than unfertilized plants. Fertilization tended to reduce plant sensitivity to O3.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Environmental Pollution - Volume 156, Issue 1, November 2008, Pages 53–60
نویسندگان
, ,