Carbon inputs by irrigated corn roots to a Vertisol

IF 1 Q3 PLANT SCIENCES
Plant Root Pub Date : 2010-01-01 DOI:10.3117/PLANTROOT.4.18
N. Hulugalle, T. Weaver, L. Finlay
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引用次数: 7

Abstract

Row crops commonly grown under irrigation in the Vertisols of north-western New South Wales, Australia, include summer crops such as corn (Zea mays L.) and cotton (Gossy- pium hirsutum L.). Soil organic carbon (SOC) and residue (SOR) dynamics in these farming systems have been analysed primarily in terms of inputs of above-ground material and root mass towards the end of a growing season. Addition of root material to SOC and SOR stocks either in the form of roots dying and decaying during and after the crop's growing season may, however, be significant. Carbon inputs by roots of irrigated corn to an irrigated Vertisol were evaluated in an experiment near Narrabri, Australia, where corn grown as a monoculture was compared with corn sown in rotation with cotton. Root growth in the surface 0.10 m was measured with the core-break method, and that in the 0.10 to 1.0 m depth with a minirhizotron and I-CAP image capture system. These measurements were used to derive root length per unit area (LA), root C added to soil through intra-seasonal root death (Clost), C in roots remaining at end of season (Croot) and root C potentially available for addition to soil (Ctotal). Ctotal averaged 5.0 Mg ha -1 with cotton-corn and 9.3 Mg ha -1 with corn monocul- ture, with average Clost accounting for 11%. Intra-seasonal root death from corn made only a small contribution to soil carbon stocks. LA of corn was higher with corn monoculture than with cotton-corn.
经灌溉的玉米根部向土壤中的碳输入
在澳大利亚新南威尔士州西北部的Vertisols,通常在灌溉下种植的行作物包括夏季作物,如玉米(Zea mays L.)和棉花(Gossy- pium hirsutum L.)。在这些耕作系统中,土壤有机碳(SOC)和残留物(SOR)的动态主要是根据生长季节结束时地上物质和根系质量的投入来分析的。然而,在作物生长季节期间和之后,以根系死亡和腐烂的形式向有机碳和SOR砧木中添加根系物质可能是显著的。在澳大利亚Narrabri附近进行的一项试验中,对灌溉玉米根部向灌溉的Vertisol的碳输入进行了评估,该试验将玉米单作种植与玉米轮作种植进行了比较。采用岩心破碎法测量地表0.10 m的根系生长,采用minirhizotron和I-CAP图像捕获系统测量地表0.10 ~ 1.0 m的根系生长。这些测量结果用于计算单位面积根长度(LA)、通过季节内根死亡(Clost)添加到土壤中的根C、季末剩余根中的根C (Croot)和潜在可添加到土壤中的根C (Ctotal)。棉花玉米的Ctotal平均为5.0 Mg ha -1,玉米单作的Ctotal平均为9.3 Mg ha -1,平均Clost占11%。玉米的季节性根系死亡对土壤碳储量的贡献很小。玉米单作玉米的LA高于棉-玉米单作玉米。
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来源期刊
Plant Root
Plant Root PLANT SCIENCES-
CiteScore
1.50
自引率
0.00%
发文量
2
期刊介绍: Plant Root publishes original papers, either theoretical or experimental, that provide novel insights into plant roots. The Journal’s subjects include, but are not restricted to, anatomy and morphology, cellular and molecular biology, biochemistry, physiology, interactions with soil, mineral nutrients, water, symbionts and pathogens, food culture, together with ecological, genetic and methodological aspects related to plant roots and rhizosphere. Work at any scale, from the molecular to the community level, is welcomed.
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