Hydrology and runoff water quality from three improved pastures compared with virgin brigalow (

IF 1.2 4区 环境科学与生态学 Q4 ECOLOGY Rangeland Journal Pub Date : 2022-12-08 DOI:10.1071/rj22042
A. Elledge, C. Thornton
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Abstract

The Fitzroy Basin in central Queensland has the largest cattle herd of any natural resource management region in Australia, and legumes have been widely used to boost fertility of rundown soil and improve cattle liveweight gains. However, there is a paucity of information on the effect of leguminous pastures on hydrology and water quality. This study investigated runoff water quality over eight hydrological years from virgin brigalow (Acacia harpophylla) woodland and three improved pastures, namely, buffel grass (Pennisetum ciliare), butterfly pea (Clitoria ternatea) and leucaena (Leucaena leucocephala). Runoff event mean concentrations and loads of total and dissolved nitrogen, phosphorus, and carbon in addition to total suspended solids are reported. Brigalow woodland had the greatest loss of sediment and nitrogen attributed to the inherently fertile Vertosols (clay soil), but the low occurrence and amount of runoff meant that it had a low risk to water quality. Despite a similar number of runoff events from the improved pastures, leucaena pasture had less total runoff and a lower maximum peak runoff rate in addition to lower nitrogen and carbon in runoff. Total suspended solids and carbon in runoff were greater from grass pasture than from the leguminous pastures, whereas nitrogen and phosphorus were greatest from the butterfly pea pasture, especially in the first 2 years post-planting. Greater exports of phosphorus from the improved pastures were concerning, given the potential for downstream impacts.
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与原始平房相比,三个改良牧场的水文和径流水质(
昆士兰州中部的菲茨罗伊盆地拥有澳大利亚所有自然资源管理地区中最大的牛群,豆类已被广泛用于提高贫瘠土壤的肥力和提高牛的体重。然而,关于豆科牧场对水文和水质的影响的信息很少。本研究调查了八个水文年来原始brigalow(Acacia harphophylla)林地和三个改良牧场的径流水质,即水牛草(Pennisetum cilare)、蝴蝶豌豆(Clitoria ternatea)和银合欢(leucaena leuccephala)。报告了径流事件中总氮、溶解氮、磷和碳以及总悬浮固体的平均浓度和负荷。Brigalow林地的沉积物和氮损失最大,这归因于天生肥沃的Vertosol(粘土),但径流的发生率和数量较低,这意味着它对水质的风险较低。尽管改良牧场的径流事件数量相似,但除了径流中的氮和碳含量较低外,亮氨酸牧场的总径流较少,最大峰值径流量较低。草牧场径流中的总悬浮物和碳含量高于豆科牧场,而蝴蝶豌豆牧场的氮和磷含量最高,尤其是在种植后的前两年。考虑到下游影响的可能性,改良牧场的磷出口增加令人担忧。
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来源期刊
Rangeland Journal
Rangeland Journal 环境科学-生态学
CiteScore
2.90
自引率
8.30%
发文量
14
审稿时长
>36 weeks
期刊介绍: The Rangeland Journal publishes original work that makes a significant contribution to understanding the biophysical, social, cultural, economic, and policy influences affecting rangeland use and management throughout the world. Rangelands are defined broadly and include all those environments where natural ecological processes predominate, and where values and benefits are based primarily on natural resources. Articles may present the results of original research, contributions to theory or new conclusions reached from the review of a topic. Their structure need not conform to that of standard scientific articles but writing style must be clear and concise. All material presented must be well documented, critically analysed and objectively presented. All papers are peer-reviewed. The Rangeland Journal is published on behalf of the Australian Rangeland Society.
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