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首页> 外文期刊>Agroforestry Systems >Plant water relations and edaphoclimatic conditions affecting acorn production in a holm oak (Quercus ilex L. ssp. ballota) open woodland
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Plant water relations and edaphoclimatic conditions affecting acorn production in a holm oak (Quercus ilex L. ssp. ballota) open woodland

机译：开阔的林地中植物水的关系和影响气候的橡树栎（ederphoclimatic）的生态环境条件

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摘要

Acorn production patterns and the annual evolution of water relations parameters of Quercus ilex ssp. ballota (Desf.) Samp. in a dehesa (an open woodland forest) subject to various soil treatments (ploughing, ploughing + sowing, control) were studied in southwest Spain from June 2006 to December 2008. The effects of soil water holding capacity and effective soil depth on soil and plant water status and acorn production were also investigated. Water parameters showed significant differences between the ploughing treatment and the control, and there were also significant temporal differences. Xylem water potential ranged from −3.4 ± 0.1 to −0.7 ± 0.2 MPa, and cuticular transpiration was 62.4–192.9 mmol H2O kg−1 s−1. Acorn production did not differ significantly according to soil treatment, and showed large intra-specific variability. Individual values ranged from 0 to 1,220 g m−2 (fresh weight). Positive relationships were found between xylem water potential, cuticular transpiration and relative water content measured at midsummer, and acorn production during the three studied years. These results suggest that climatic conditions and soil water availability have a strong influence on plant water status, and therefore on acorn development during summer. The results also reflect the ability of this species to adapt to the Mediterranean climate by preserving water during dry periods, which to a large extent can be attributed to stomatal closure at high relative water content levels, and low cuticular transpiration during these periods.
机译：栎树的橡子生产模式和水关系参数的年度演变。 Ballota（Desf。）Samp。 2006年6月至2008年12月，在西班牙西南部的dehesa（开阔的林地森林）中进行了各种土壤处理（耕作，耕作+播种，控制）的研究。土壤持水量和有效土壤深度对土壤和植物的影响还调查了水分状况和橡子产量。耕作参数与对照之间的水分参数显示出显着差异，并且时间上也存在显着差异。木质部水势范围为-3.4±0.1至-0.7±0.2 MPa，表皮蒸腾量为62.4–192.9 mmol H 2 O kg -1 s -1 。根据土壤处理，橡子产量没有显着差异，并且显示出较大的种内变异性。各个值的范围为0到1,220 g m −2 （鲜重）。在这三年的研究中，木质部水势，表皮蒸腾和仲夏时测的相对含水量与橡子产量之间存在正相关关系。这些结果表明，气候条件和土壤水分利用率对植物水分状况有很大影响，因此对夏季橡子的发育也有很大影响。结果还反映了该物种通过在干旱时期保存水来适应地中海气候的能力，这在很大程度上可以归因于在这些相对含水量较高的情况下气孔关闭和这些时期的表皮蒸腾作用较低。

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