Spring Manure and Biosolid Compost Additions Affect Soil, Vegetation, and Microbial Characteristic in Dry Rangelands

IF 2.4 3区 环境科学与生态学 Q2 ECOLOGY
Julie Bethany, Steve Kutos, Kristen Oliver, Eva Stricker
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Abstract

In light of climate change, ranchers need management tools to restore dry grasslands. To boost productivity and resilience, compost applications have shown promise, but little is known about the effect of composts that differ in initial feedstock and resulting biological and chemical characteristics. Our objective was to compare commonly available composts to evaluate how they affected soil microbial community composition and soil health−related responses in drylands. We added biosolid versus manure composts to 64-m2 plots in a rangeland in Socorro County, New Mexico and measured microbial, soil, and plant characteristics after 6 mo and 1 yr. We found that while composts hosted diverse microbial taxa, relative abundance of native soil microbial communities did not shift dramatically from controls at either 6 mo or 1 yr after compost addition. Aggregate stability was 22% lower in manure than biosolid compost and controls (P = 0.048), but aboveground biomass tended to strongly increase depending on exclosure treatment (P = 0.048), and composition shifted to relatively abundant annual forbs with biosolid compost compared with controls. Together, these results suggest that while increased organic matter enhanced vegetation biomass, an important implication for range managers, the dominant microbial community members were not primarily responsible for observed shifts in responses.

添加春肥和生物固体堆肥会影响干旱牧场的土壤、植被和微生物特征
鉴于气候变化,牧场主需要管理工具来恢复干旱草地。为了提高生产率和恢复能力,堆肥的应用前景广阔,但人们对不同初始原料的堆肥及其产生的生物和化学特性的影响知之甚少。我们的目标是比较常见的堆肥,评估它们如何影响旱地的土壤微生物群落组成和与土壤健康相关的反应。我们在新墨西哥州索科罗县一块 64 平方米的牧场中添加了生物固体堆肥和粪便堆肥,并在 6 个月和 1 年后测量了微生物、土壤和植物特征。我们发现,虽然堆肥容纳了多种微生物类群,但在添加堆肥 6 个月或 1 年后,与对照组相比,本地土壤微生物群落的相对丰度并没有发生显著变化。粪肥的团聚稳定性比生物固体堆肥和对照组低 22%(P = 0.048),但地上生物量随围栏处理的不同而有大幅增加的趋势(P = 0.048),与对照组相比,生物固体堆肥的组成转向相对丰富的一年生草本植物。总之,这些结果表明,虽然有机质的增加提高了植被生物量,这对牧场管理者具有重要意义,但主要微生物群落成员并不是造成所观察到的反应变化的主要原因。
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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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