Variation among biomes in temporal dynamics of aboveground primary production
Variation among biomes in temporal dynamics of aboveground primary production
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DOI：
10.1126/science.291.5503.481
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发表时间：
2001-01-19
期刊：
影响因子：
56.9
通讯作者：
Smith, MD
中科院分区：
文献类型：
--
作者：
Knapp, AK;Smith, MD
利用北美11个长期生态研究点的长期（平均= 12年）数据对地上净初级生产力（ANPP）的年际变化进行了评估。在大陆尺度上，年降水量与农业净初级生产力的相关性最强。然而，年际变化在ANPP是不相关的降水量的变化。相反，最大的变异性发生在生物群落中，草本植被的高潜在增长率与降水的中等变异性相结合。在最具活力的生物群落中，ANPP对湿润年份的反应比干旱年份更强烈。认识到整个生物群落的ANPP动态的四倍范围以及限制这种可变性的因素对于检测全球变化现象的生物影响至关重要。
Interannual variability in aboveground net primary production (ANPP) was assessed with Long-term (mean = 12 years) data from 11 Long Term Ecological Research sites across North America. The greatest interannual variability in ANPP occurred in grasslands and old fields, with forests the Least variable, At a continental scale, ANPP was strongly correlated with annual precipitation. However, interannual variability in ANPP was not related to variability in precipitation. Instead, maximum variability in ANPP occurred in biomes where high potential growth rates of herbaceous vegetation were combined with moderate variability in precipitation. In the most dynamic biomes, ANPP responded more strongly to wet than to dry years. Recognition of the fourfold range in ANPP dynamics across biomes and of the factors that constrain this variability is critical for detecting the biotic impacts of global change phenomena.