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首页> 外文期刊>Climatic Change >Climatic trends and different drought adaptive capacity and vulnerability in a mixed Abies pinsapo-Pinus halepensis forest
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Climatic trends and different drought adaptive capacity and vulnerability in a mixed Abies pinsapo-Pinus halepensis forest

机译：松树冷杉-半夏混合林的气候趋势和不同的干旱适应能力及脆弱性

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摘要

The projected temperature rise, rainfall decrease and concentration of rainfall in extreme events could induce growth decline and die-off on tree populations located at the geographical distribution limit of the species. Understanding of adaptive capacity and regional vulnerability to climate change in Mediterranean forests is not well developed and requires more focused research efforts. We studied the relationships between spatiotemporal patterns of temperature and precipitation along the southwestern edge of the Betic range (southern Spain) and measured basal area increment (BAI) and carbon isotope ( Delta ) in tree ring series of Abies pinsapo and Pinus halepensis, two Mediterranean conifer trees with contrasting drought adaptive capacity. Climatic information was obtained from a network covering a wide range of elevations and distances from the Atlantic and Mediterranean coasts. Temperature trends were tested by the Mann-Kendall test, and precipitation was thoroughly analyzed by quantile regression. Climatic data showed a warming trend, enhanced since the 1970s, while quantile regressions revealed that drought events worsened during the course of the twentieth century. Long-term decrease of A. pinsapo BAI was related to regional warming and changing precipitation patterns, suggesting increasing drought stress on this species. Both temperature and precipitation in the summer influenced wood Delta in P. halepensis, whereas negative correlation between wood Delta and current autumn temperature was yielded for A. pinsapo. Increased intrinsic water use efficiency was inferred from wood Delta in both species; however, A. pinsapo showed sudden growth reductions under drier conditions, while pine trees were able to maintain almost constant BAI values and lower water costs under increasing long-term water stress.
机译：在极端事件中，预计的温度上升，降雨减少和降雨集中可能会导致生长下降和死亡，而该种群位于该物种的地理分布极限。对地中海森林对气候变化的适应能力和区域脆弱性的理解尚不完善，需要更加集中的研究工作。我们研究了两个地中海沿岸Abies pinapo和Pinus halepensis的年轮系列中，Betic山脉西南边缘（西班牙南部）温度与降水的时空分布之间的关系，以及测量的基面积增量（BAI）和碳同位素（Delta）之间的关系。具有相反干旱适应能力的针叶树。气候信息是从覆盖大西洋和地中海沿岸各种海拔和距离的网络中获得的。通过Mann-Kendall测试对温度趋势进行了测试，并通过分位数回归对沉淀进行了全面分析。气候数据显示出自1970年代以来变暖的趋势，而分位数回归显示，二十世纪期间干旱事件恶化了。 A. pinapo BAI的长期减少与区域变暖和降水模式变化有关，表明该物种的干旱压力增加。夏季的温度和降水都影响了哈利木对虾的木材三角洲，而松果木的三角洲和当前秋季温度之间却呈负相关。从两个物种的木材三角洲推断出内在水分利用效率的提高;然而，松树A. a。pinapo在较干燥的条件下显示出突然的生长减少，而松树能够在长期的水分压力增加的情况下保持几乎恒定的BAI值并降低水成本。

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