Ecosystem Effects of Sitka Alder in a Douglas-fir Plantation
Ecosystem Effects of Sitka Alder in a Douglas-fir Plantation
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花旗松人工林中西特卡桤木的生态系统效应
DOI：
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发表时间：
1984
期刊：
影响因子：
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通讯作者：
K. Cromack
中科院分区：
文献类型：
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作者：
D. Binkley;J. Lousier;K. Cromack
对锡特卡桤木Alnus sinuata（Regel）Rydb.花旗松（Pseudotsuga menziesii（Mirb.）Franco）种植园提供了一个评估灌木状锡特卡桤木对花旗松生长和养分含量、生态系统生物量、地上净初级生产量、凋落物和土壤的影响的机会。估计氮素的增加量为30公斤/公顷- 年- 在锡特卡桤木/花旗松生态系统中进行了23年的研究。虽然花旗松放养和断面积没有显着影响锡特卡桤木，目前的平均胸径为13%以上，5年平均断面积增长33%以上，干生物量增量40%以上的锡特卡桤木网站。在花旗松叶片中的氮浓度增加与锡特卡桤木本显着，但磷和硫的浓度显着降低。凋落物的养分含量是3至7倍以上的锡特卡桤木网站，土壤氮的有效性指数是3倍。锡特卡桤木联合收割机的适度固氮率和灌木状生长形式使其成为一个有吸引力的物种与针叶树的混合物在缺氮的网站。森林科学30：26-35。
The natural seeding of Sitka alder (Alnus sinuata (Regel) Rydb.) into a portion of a Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) plantation afforded an opportunity to assess the effects of shrubby Sitka alder on Douglas-fir growth and nutrient content, on ecosystem biomass, aboveground net primary production, and litterfall, and on soils. Estimated accretion ofnitrogefi (N) was 30 kg ha - yr - for 23 years in the Sitka alder/Douglas-fir ecosystem. Though Douglas-fir stocking and basal area were not significantly affected by Sitka alder, current average dbh was 13 percent greater, 5-year average basal area growth 33 percent greater, and stem biomass increment 40 percent greater on the Sitka alder site. Nitrogen concentrations in Douglas-fir foliage increased significantly with Sitka alder present, but concentrations of phosphorus and sulfur were markedly reduced. Nutrient content of litterfall was 3 to 7 times greater on the Sitka alder site, and the soil-N availability index was 3-fold greater. Moderate N-fixation rates and shrubby growth form of Sitka alder combine to make it an attractive species for mixture with conifers on N-deficient sites. FOREST SCI. 30:26-35.