Rootstock-dependent soil respiration in a citrus orchard

N. Keutgen, M. Huysamer
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引用次数: 6

Abstract

Soil respiration is a major contributor to the carbon flux in apple orchards, but very little data exist for citrus. Daytime soil respiration, grass respiration, and grass photosynthesis were recorded in a ‘Nules’ clementine (Citrus reticulata Blanco) orchard on ‘Carrizo’ citrange or ‘X639’ rootstock in Stellenbosch, Republic of South Africa, under typically variable spring weather conditions such as cool to hot, and clear to cloudy days. The amount of CO2 contributed by the citrus roots and the Oakleaf soil type to the carbon fluxes in the orchard, was evaluated. Soil respiration rate in the citrus rows varied between 0.1 and 0.4 g CO2 m−2 h−1 and increased with temperature, with a Q10 of about 1.4. After rainfall or irrigation, soil respiration was higher, especially at elevated temperatures. The rootstocks ‘Carrizo’ and ‘X639’ were characterised by slightly different rates of soil respiration. The difference was more pronounced after irrigation, and soil respiration of ‘X639’ exceeded that of ‘Carrizo’...
柑橘果园中依赖于砧木的土壤呼吸
土壤呼吸是苹果园碳通量的主要贡献者,但关于柑橘的数据很少。在南非共和国Stellenbosch的“Carrizo”柑橘或“X639”砧木上的“Nules”小柑橘(Citrus reticulata Blanco)果园中,在典型的变化不定的春季天气条件下,如凉爽到炎热,晴朗到阴天,记录了白天土壤呼吸、草呼吸和草光合作用。评价了柑橘根系和橡树叶土壤类型对果园碳通量的贡献量。柑橘行间土壤呼吸速率在0.1 ~ 0.4 g CO2 m−2 h−1之间变化,随温度升高而增加,Q10约为1.4。降雨或灌溉后,土壤呼吸增加,特别是在高温下。砧木‘Carrizo’和‘X639’的土壤呼吸速率略有不同。灌溉后差异更明显,X639土壤呼吸大于Carrizo。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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