斑烧放牧对亚热带湿润草原植被组成和结构的影响

IF 2.4 3区环境科学与生态学 Q2 ECOLOGY

Rangeland Ecology & Management Pub Date : 2025-01-01 DOI:10.1016/j.rama.2024.11.003

Elizabeth H. Boughton , Grégory Sonnier , Nuria Gomez-Casanovas , Carl Bernacchi , Evan DeLucia , Jed Sparks , Hilary Swain , Emily Anderson , Keith Brinsko , Akiem M. Gough , Luca W. Kuziel , Lydia Landau , Haoyu Li , Nicholas A. McMillan , Alma L. Reyes , Alan Rivero , Amartya Saha , Julie Sorfleet , Amanda West , Maya Zambrano-Lee

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引用次数: 0

摘要

烧草食，一种由火驱动的放牧过程，已被证明在易发火灾的草原上产生异质性。斑块燃烧放牧（PBG）是一种管理工具，用于利用热草食，并与促进同质性的完全燃烧放牧（FB）形成对比。本文对美国佛罗里达州亚热带湿润草原上两种不同草场类型（集约管理草场[IMP]与非集约管理半自然草场[SNP]）的植物群落（植被组成、多样性和异质性）、土壤特征和火灾燃料消耗对PBG的响应进行了综合评估。2017年，我们在Archbold生物站的巴克岛牧场建立了16个实验牧场，每个16公顷，IMP 8个，SNP 8个。在每个牧场类型的8个牧场中，2017年有4个牧场被完全烧毁（FB），而在其他4个牧场中，连续3年（2017年、2018年和2019年）每年都有三分之一的牧场被烧毁（PBG）。由于形成斑块对比，pbg处理的牧场预计具有更大的植物丰富度、多样性和结构异质性，而FB处理的牧场预计具有均匀的植被结构，因为斑块都具有相同的火灾历史。SNP与IMP相比，燃烧的燃料消耗更大，PBG内燃烧的斑块与FB中相似大小的区域相比。最近被烧毁的斑块具有更大的本地丰富度和香农多样性，这是由更多的牧草和莎草的数量和覆盖所驱动的，但这种响应的幅度在不同年份之间有所不同。火灾发生后不久，PBG牧场的结构异质性更大，但在生长季结束时这种异质性消失。PBG有利于SNP的保护和生产目标，但在IMP中实施PBG可能需要激励计划，以抵消饲料生产的损失，同时获得更高的高度异质性和潜在的植被多样性增加。

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Impact of Patch‐Burn Grazing on Vegetation Composition and Structure in Subtropical Humid Grasslands

Pyric herbivory, a process by which grazing is driven by fire, has been shown to create heterogeneity in fire-prone grasslands. Patch-burn grazing (PBG) is a management tool used to harness pyric herbivory and contrasts with full burn (FB) which fosters homogeneity. Here we provide a comprehensive assessment of plant communities (vegetation composition, diversity, and heterogeneity), soil characteristics, and fire fuel consumption responses to PBG as compared to FB management in two different pasture-types (intensively managed pastures [IMP] vs. less intensely managed seminatural pastures [SNP]) in subtropical, humid grasslands in Florida, USA. In 2017, we established 16 experimental pastures at Archbold Biological Station's Buck Island Ranch that were 16-ha each, eight in IMP and eight in SNP. Of the eight pastures in each pasture-type, four were fully burned in 2017 (FB) while in the other four, one-third of the pasture was burned each year for three years (2017, 2018, and 2019) (PBG). PBG-treated pastures were expected to have greater plant richness, diversity, and structural heterogeneity due to the creation of patch contrast while in FB pastures, we expected homogeneous vegetation structure because patches would all have the same fire history. Fuel consumption by fire was greater in SNP vs. IMP and in burned patches within PBG vs. similar-size areas in FB. Recently burned patches had greater total native richness and Shannon diversity, driven by greater numbers and cover of forbs and sedges, but the magnitude of this response varied among years. PBG pastures had greater structural heterogeneity shortly after fire but this disappeared by the end of the growing season. PBG benefits both conservation and production goals in SNP, but incentive programs may be required to implement PBG in IMP to offset losses in forage production while gaining increased height heterogeneity and potential increases in vegetation diversity.

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来源期刊

Rangeland Ecology & Management 农林科学-环境科学

CiteScore

4.60

自引率

13.00%

发文量

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.