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首页> 外文期刊>Geoderma: An International Journal of Soil Science >Small-scale spatial variation of soil organic matter pools generated by cork oak trees in Mediterranean agro-silvo-pastoral systems
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Small-scale spatial variation of soil organic matter pools generated by cork oak trees in Mediterranean agro-silvo-pastoral systems

机译：地中海农业田园田间软木橡树生成的土壤有机质池的小规模空间变化

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摘要

The aim of this study was to assess the role of cork oak (Quercus suber L.) trees on the small-scale variation of soil organic matter (SOM) pools in an agro-silvo-pastoral system under Mediterranean semi-arid conditions in northeastern Sardinia, Italy. Six cork oak trees were selected in a wooded grassland (30% tree ground cover). For each tree, and along two opposite transects (NE and SW), floor litter and soil (20-cm depth) were sampled at five points starting next to the trees' trunk and ending beyond the tree crown projection. Soil organic matter quality was characterized by measuring the content of water extractable organic matter (WEOM), free particulate SOM (POMf), occluded aggregates particulate SOM (POMo), and mineral-associated SOM (MOM). Carbon (C) input from floor litter was larger in the sampling points under the tree crown projection than in those beyond the tree crown. The C content of SOM pools differed among sampling positions regardless of the transect orientation, decreasing from the trunk to the positions beyond the tree crown projection, from 24.1 to 15.7 g C kg(-1) for MOM, and from 9.9 to 5.7 g C kg(-1) for the sum of WEOM, POMf and POMo. The C in MOM next to the tree trunk was above the saturation level sensu Hassink and Whitmore (1997), but below saturation beyond the tree crown projection. The nitrogen (N) distribution showed a similar trend. These results indicate that in these agro-silvo-pastoral systems, oak trees generate hot spots of soil C storage, by controlling the rate of C inputs via litterfall. Hence, conservation strategies designed to maintain cork oak trees in grasslands will also contribute to maintain a high stock of C stored and a resilient, multipurpose system. (C) 2016 Elsevier B.V. All rights reserved.
机译：本研究的目的是评估软木橡木（Quercus Suber L.）树木对东北地中海半干旱条件下的农业 - 西尔沃 - 田园体系中土壤有机物质（SOM）池的小规模变异的作用撒丁岛，意大利。在树木繁茂的草地（30％的树木地覆盖）中选择了六棵软木橡树。对于每棵树，沿着两个相反的横断电（NE和SW），地板垃圾和土壤（20厘米深度）在树干旁边的五分处进行采样，并以超出树冠投影结束。土壤有机物质质量的特征在于测量水可提取物质（WEOM）的含量，自由颗粒SOM（POMF），闭塞聚集颗粒颗粒SOM（POMO）和矿物相关的SOM（MOM）。在树冠投影下，从地板垫片的碳（c）从地板垫片的输入大于树冠上的采样点。 Som池的C含量在采样位置之间不同，无论横向取向如何，从树干上减小到树冠投影的位置，从24.1到15.7g c kg（-1），为9.9到5.7 g c kg（-1）为Weom，pomf和pomo的总和。在树干旁边的MOM中的C在饱和水平Sensu Hassink和Whitmore（1997）之上，但低于树冠投影的饱和度。氮气（n）分布显示了类似的趋势。这些结果表明，在这些农业 - 西瓦 - 牧场系统中，橡树树通过落实的C输入速率来产生土壤C存储的热点。因此，旨在维护草原的软木橡树树木的保护策略也将有助于维持储存的高库存和弹性多用途系统。 （c）2016年Elsevier B.v.保留所有权利。

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