TROPICAL FORESTS : AN EVALUATION AND SYNTHESIS OF EXISTING FIELD DATA
TROPICAL FORESTS : AN EVALUATION AND SYNTHESIS OF EXISTING FIELD DATA
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通讯作者：
Deborah;-A.;Clark;Sandra Brown;David;-W.;Kicklighter;Jeffrey;-Q.;Chambers;John;-R.;
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作者：
Deborah;-A.;Clark;Sandra Brown;David;-W.;Kicklighter;Jeffrey;-Q.;Chambers;John;-R.;
需要关于热带森林净初级生产力的信息，以制定现实的全球碳预算，预测这些生态系统将如何受到气候和大气变化的影响，并评估热带森林碳通量的涡动协方差测量。然而，对通常用于解决这些问题的数据库的审查表明，该数据库存在严重缺陷。在本文中，我们综合的原始文献中的数据在古老的热带森林NPP产生一个一致的数据集，这些森林的NPP。对这一生物群落的研究只涉及少数净初级生产力组成部分，都是地上部分。鉴于直接现场测量的范围有限，我们在现有数据中寻找关系，以便从更容易评估的数据中估计生产的未测量方面。我们发现年凋落物量和地上生物量增量之间的预测关系。对于39个不同的热带森林网站，然后，我们制定了一致的，有记录的估计的上限和下限周围的总净初级生产力作为基准校准和验证生态地球化学模型与此生物群落。我们开发了这些估计的基础上现有的实地测量，目前的理解，地上消费和生物挥发性有机碳排放量，我们的判断，地下生产的范围为0.2-1.2 3 ANPP（地上NPP）。在这一广泛的热带森林（干燥到潮湿，低地到山地，营养丰富到营养贫乏的土壤）中，我们对总NPP的估计下限和上限范围为1.7 - 11.8 Mg C·ha 21·yr 21（下限）和3.1 - 21.7 Mg C·ha 21·yr 21（上限）。我们还表明，两个关系，已被用于估计NPP（布雷-戈勒姆关系的基础上落叶和迈阿密模型的基础上温度或降水）是无效的热带森林生物群系。
Information on net primary production in tropical forests is needed for the development of realistic global carbon budgets, for projecting how these ecosystems will be affected by climatic and atmospheric changes, and for evaluating eddy covariance measurements of tropical forest carbon flux. However, a review of the database commonly used to address these issues shows that it has serious flaws. In this paper we synthesize the data in the primary literature on NPP in old-growth tropical forests to produce a consistent data set on NPP for these forests. Studies in this biome have addressed only a few NPP components, all aboveground. Given the limited scope of the direct field measurements, we sought relationships in the existing data that allow estimation of unmeasured aspects of production from those that are more easily assessed. We found a predictive relationship between annual litterfall and aboveground biomass increment. For 39 diverse tropical forest sites, we then developed consistent, documented estimates of the upper and lower bounds around total NPP to serve as benchmarks for calibrating and validating biogeochemical models with respect to this biome. We developed these estimates based on existing field measurements, current understanding of aboveground consumption and biogenic volatile organic carbon emissions, and our judgment that belowground production is bounded by the range 0.2–1.2 3 ANPP (aboveground NPP). Across this broad spectrum of tropical forests (dry to wet, lowland to montane, nutrient-rich to nutrient-poor soils), our estimates of lower and upper bounds on total NPP range from 1.7 to 11.8 Mg C·ha21·yr21 (lower bounds) and from 3.1 to 21.7 Mg C·ha21·yr21 (upper bounds). We also showed that two relationships that have been used for estimating NPP (the Bray-Gorham relationship based on leaf litterfall and the Miami model based on temperature or precipitation) are not valid for the tropical forest biome.