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首页> 外文期刊>Australian Journal of Soil Research >Nitrogen and carbon cycling in a New Zealand pumice soil under a manuka (Leptospermum scoparium) and kanuka (Kunzea ericoides) shrubland
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Nitrogen and carbon cycling in a New Zealand pumice soil under a manuka (Leptospermum scoparium) and kanuka (Kunzea ericoides) shrubland

机译：麦卢卡（Leptospermum scoparium）和卡努卡（Kunzea ericoides）灌木丛下的新西兰浮石土壤中的氮和碳循环

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摘要

Shrubland communities dominated by manuka (Leptospermum scoparium J. Forst. and G. Forst.) and kanuka (Kunzea ericoides var. ericoides ((A. Rich) J. Thompson) are widespread throughout New Zealand. They frequently colonise disturbed land surfaces and are important for erosion mitigation, and also for their capacity to act as a carbon (C) sink. We here investigate C and nitrogen (N) cycling in 3 stands (~26-56 years old) that had established on a repeatedly burned forest site on a Podzolic Orthic Pumice soil in the Turangi area, central North Island. For comparison, limited measurements of N cycling were also made at other manuka-kanuka sites on non-volcanic soils. Leaf N concentrations at the Turangi site were 11.8-13.9g/kg, and lower than those at many of the other manuka-kanuka stands. Total annual litterfall and N content increased with stand age, as did total N concentrations in FH material and mineral soil (0-100mm depth). Total C concentrations in mineral soil did not, however, differ significantly in the 3 stands. Levels of soil microbial C and N, rates of carbon dioxide production, and metabolic coefficients (qCO values) suggest C cycling could be fairly rapid at this site. In contrast, rates of net mineral-N and nitrate-N production were low to very low compared with those in similar pumice soils under angiosperm-conifer forests, and in the non-volcanic soils under other manuka-kanuka stands. Low N availability and tight N cycling at the Turangi site are thereby strongly suggested. No definitive explanation for the atypically low N availability at this site is apparent, although the possible effects of previous forest burnings may have been a contributing factor. The continued growth of these shrubs, nevertheless, shows they can compete successfully for the N that does become available through gross N mineralisation in the Turangi ecosystem.
机译：麦卢卡（Leptospermum scoparium J. Forst。和G. Forst。）和卡努卡（Kunzea ericoides var。ericoides（（A. Rich）J. Thompson）占主导地位的灌木丛群落遍布新西兰各地，它们经常在受干扰的土地表面定殖，对于缓解侵蚀及其作为碳（C）汇的能力很重要我们在这里研究了在反复燃烧的森林中建立的3个林分（约26-56岁）中的碳和氮（N）循环在北岛中部图兰吉地区的Podzolic Orthic Pumice土壤上，为了比较，在非火山土壤上的其他麦卢卡-卡努卡站点也对N循环进行了有限的测量，图朗伊站点的叶片N浓度为11.8-13.9g / kg，低于其他许多麦卢卡-卡努卡树种的水平，总年凋落物和氮含量随树龄的增加而增加，FH材料和矿质土壤（0-100mm深度）中的总N浓度也增加。矿物土没有，但是iffer在3个看台中明显。土壤微生物碳和氮的水平，二氧化碳的产生速率和代谢系数（qCO值）表明，该地点的碳循环可能相当快。相反，与被子植物-针叶林下的类似浮石土壤和其他麦卢卡-卡努卡林下的非火山土壤相比，净矿质氮和硝酸盐氮的产生率低至非常低。因此强烈建议在图朗伊（Turangi）站点提供低氮利用率和严格的氮循环。尽管以前森林焚烧的可能影响可能是造成这种情况的原因，但对于该地点非典型的氮素利用率尚无明确的解释。但是，这些灌木的持续生长表明它们可以成功竞争通过图朗伊生态系统中的总氮矿化而获得的氮。

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