Grulke N E, Johnson R, Monschein S, Nikolova P, Tausz M
Pacific Southwest Research Station, USDA Forest Service, 4955 Canyon Crest Drive, Riverside, CA 92507, USA.
Tree Physiol. 2003 Sep;23(13):923-9. doi: 10.1093/treephys/23.13.923.
Crown morphology and leaf tissue chemical and biochemical attributes associated with ozone (O3) injury were assessed in the lower, mid- and upper canopy of Jeffrey pine (Pinus jeffreyi Grev. & Balf.) growing in mesic and xeric microsites in Sequoia National Park, California. Microsites were designated mesic or xeric based on topography and bole growth in response to years of above-average precipitation. In mesic microsites, canopy response to O3 was characterized by thinner branches, earlier needle fall, less chlorotic leaf mottling, and lower foliar antioxidant capacity, especially of the aqueous fraction. In xeric microsites, canopy response to O3 was characterized by higher chlorotic leaf mottling, shorter needles, lower needle chlorophyll concentration, and greater foliar antioxidant capacity. Increased leaf chlorotic mottle in xeric microsites was related to drought stress and increased concurrent internal production of highly reactive oxygen species, and not necessarily to stomatal O3 uptake. Within-canopy position also influenced the expression of O3 injury in Jeffrey pine.
在加利福尼亚州红杉国家公园中生和干旱微生境中生长的杰弗里松（Pinus jeffreyi Grev. & Balf.）的下层、中层和上层树冠中，评估了与臭氧（O3）伤害相关的树冠形态以及叶片组织的化学和生化属性。根据地形以及多年高于平均降水量情况下树干的生长情况，将微生境划分为中生或干旱微生境。在中生微生境中，树冠对O3的响应表现为枝条更细、针叶提前脱落、叶片褪绿斑驳更少以及叶片抗氧化能力更低，尤其是水溶部分。在干旱微生境中，树冠对O3的响应表现为叶片褪绿斑驳更多、针叶更短、针叶叶绿素浓度更低以及叶片抗氧化能力更强。干旱微生境中叶片褪绿斑驳增加与干旱胁迫以及同时增加的高活性氧物种的内部产生有关，而不一定与气孔对O3的吸收有关。树冠内的位置也影响了杰弗里松中O3伤害的表现。
