Comparing the Predictive Capacity of Allometric Models in Estimating Grass Biomass in a Desert Grassland

IF 2.4 3区 环境科学与生态学 Q2 ECOLOGY
Adam T. Naito , Steven R. Archer , Philip Heilman
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引用次数: 0

Abstract

Allometric models provide a rapid, nondestructive means for estimating aboveground biomass (AGB) of perennial grass species. In the absence of site-specific models, allometric relationships developed at other sites at other times are often used. This implicitly assumes that size-biomass relationships are highly robust. In this study, we assess the comparability of allometric relationships developed at two points in time (2005 and 2015) on different soils on a Sonoran Desert savanna in southern Arizona. We used peak growing season field measurements to develop single-species and multispecies regression models using basal diameter and height to predict the current year's AGB for seven perennial grass species. Basal diameter exhibited the strongest relationship with AGB among single-species (adjusted R2 = 0.54 to 0.87) and multispecies models (adjusted R2 = 0.73). Inclusion of height did little to improve biomass predictions. Our models generally underestimated observed 2015 AGB on the loamy site, whereas models developed in 2005 on a sandier site overestimated the 2015 AGB. Results suggest site-specific allometric models should be used when possible. However, in lieu of such models, relationships developed at other sites or at other times may be appropriate depending on the level of precision needed to address a specific research question.

比较计量模型在估算沙漠草地草生物量方面的预测能力
异速模型为估算多年生草种的地上生物量(AGB)提供了一种快速、无损的方法。在没有特定地点模型的情况下,通常使用在其他地点、其他时间建立的异速关系。这暗含了一种假设,即大小-生物量关系非常稳健。在本研究中,我们评估了亚利桑那州南部索诺兰沙漠稀树草原不同土壤上两个时间点(2005 年和 2015 年)建立的异速关系的可比性。我们利用生长旺季的实地测量结果,使用基部直径和高度建立了单物种和多物种回归模型,以预测七种多年生禾本科植物当年的AGB。在单物种模型(调整后 R2 = 0.54 至 0.87)和多物种模型(调整后 R2 = 0.73)中,基部直径与 AGB 的关系最为密切。加入高度对生物量预测的改善作用不大。我们的模型普遍低估了在壤质地点观测到的 2015 年 AGB,而 2005 年在沙质地点开发的模型则高估了 2015 年 AGB。结果表明,在可能的情况下,应使用特定地点的异速模型。然而,根据解决特定研究问题所需的精确程度,在其他地点或其他时间建立的关系可能会代替此类模型。
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来源期刊
Rangeland Ecology & Management
Rangeland Ecology & Management 农林科学-环境科学
CiteScore
4.60
自引率
13.00%
发文量
87
审稿时长
12-24 weeks
期刊介绍: Rangeland Ecology & Management publishes all topics-including ecology, management, socioeconomic and policy-pertaining to global rangelands. The journal''s mission is to inform academics, ecosystem managers and policy makers of science-based information to promote sound rangeland stewardship. Author submissions are published in five manuscript categories: original research papers, high-profile forum topics, concept syntheses, as well as research and technical notes. Rangelands represent approximately 50% of the Earth''s land area and provision multiple ecosystem services for large human populations. This expansive and diverse land area functions as coupled human-ecological systems. Knowledge of both social and biophysical system components and their interactions represent the foundation for informed rangeland stewardship. Rangeland Ecology & Management uniquely integrates information from multiple system components to address current and pending challenges confronting global rangelands.
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