Aboveground Net Primary Production and Leaf-Area Index in Early Postfire Vegetation in Yellowstone National Park

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• 作者：Rebecca A. Reed ; Mary Ellen Finley ; William H. Romme and Monica G. Turner
• 关键词：Key words ; lodgepole pine ; Yellowstone National Park ; succession ; fire ; aboveground net primary production ; leaf ; area index.
• 刊名：Ecosystems
• 出版年：1999
• 出版时间：January 1999
• 年：1999
• 卷：2
• 期：1
• 页码：88-94
• 全文大小：98 KB

文摘

Aboveground net primary production (ANPP) and leaf-area index (LAI) of lodgepole pine (Pinus contorta var. latifolia Engelm. ex Wats.) saplings and aboveground productivity of herbaceous vegetation components were determined 9 years after the 1988 fires in Yellowstone National Park (YNP). Measurements were made in four sites representing a wide range of early postfire vegetation present in YNP, including high-density lodgepole pine, low-density lodgepole pine, and two nonforest stands. LAI of the pine saplings and total ANPP (trees plus herbs) generally increased with increasing sapling density, from 0.002 m2 m− 2 and 0.25 Mg ha− 1 year− 1 in the infertile nonforest stand (100 pine saplings ha− 1) to 1.8 m2 m− 2 and 4.01 Mg ha− 1 year− 1 in the high-density pine stand (62,800 saplings ha− 1). Aboveground herbaceous productivity was not strongly correlated with sapling density, but appeared to be influenced by soil fertility. In the high-density pine stand, tree ANPP and LAI were within the lower range of values reported for similar mature coniferous forests. This finding suggests that at least some ecosystem processes (related to ANPP and LAI) may have nearly recovered after only 9 years of postfire succession, in at least some of the young forests developing after the 1988 Yellowstone fires.