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首页> 外文期刊>Plant and Soil >Influence of elevation on canopy transpiration of temperate deciduous forests in a complex mountainous terrain of South Korea
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Influence of elevation on canopy transpiration of temperate deciduous forests in a complex mountainous terrain of South Korea

机译：海拔高度对韩国复杂山区温带落叶林冠层蒸腾的影响

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Variations in microclimate and soil characteristics on mountain slopes influence forest structure and function. Precipitation, incoming solar radiation and relative humidity change along a mountain slope. Equally, soil depth and the amount of stored soil moisture vary. The objective of this study was to examine the impacts of these factors on forest water use in mountainous terrains. Transpiration of four temperate deciduous forest stands located at different elevations in South Korea was monitored with a sap flow technique throughout the growing season in 2010. The study sites were located on the north slope at 450 m (450 N), 650 m (650 N), and 950 m (950 N). To examine the effect of aspect, an additional site with a southern aspect was studied at 650 m (650S). All the sites were dominated by Quercus species, with leaf area index (L) ranging between 5 - 6 m(2) m(-2). Rainfall increased, while air temperature (T (A) ) and daytime vapor pressure deficit (D) decreased with increasing elevation. We did not observe any gradients in solar radiation (R (S) ), soil moisture and sap flux density of the individual trees (J (st) ) with an elevational gradient. Sapwood area (A (S) ), i.e., hydro-active xylem area, and daily maximum tree water use (max TWU) increased non-linearly with increasing diameter at breast height (DBH). Neither A (S) nor max TWU varied among tree species or along the elevation. The total annual canopy transpiration (E (C) ) was 175, 115, 110, and 90 mm for 450 N, 650 N, 650S, and 950 N, respectively. E (C) declined with increasing elevation as a result of decreasing length of the growing season, D, and T (A) along the elevation. Significantly (P < 0.001) higher stomatal sensitivity to changes in D was found at the 950 N, leading to lower annual E (C) and lower water use efficiency (WUE) at this elevation. We conclude that differences in E (C) exist along the mountain slope studied, corresponding to changing T (A) , D, length of the growing season, and stomatal sensitivity to D, which should be considered when establishing forest catchment water balances.
机译：山坡上的小气候和土壤特征的变化会影响森林的结构和功能。降水，入射的太阳辐射和相对湿度会沿着山坡变化。同样，土壤深度和土壤水分存储量也有所不同。这项研究的目的是研究这些因素对山区地形森林用水的影响。在2010年的整个生长季节，通过树液流技术监测了位于韩国不同海拔的四个温带落叶林林地的蒸腾情况。研究地点位于北坡，分别为450 m（450 N），650 m（650 N） ）和950 m（950 N）。为了检查坡向的影响，在650 m（650S）处研究了另一个朝南的场地。所有站点均由栎属物种主导，叶面积指数（L）在5-6 m（2）m（-2）之间。降雨增加，而气温（T（A））和白天蒸气压亏空（D）随着海拔的升高而降低。我们没有观察到太阳辐射（R（S）），土壤水分和单株树汁通量密度（J（st））随高度的梯度变化。边材面积（A（S）），即水合活性木质部面积和每日最大树用水量（max TWU）随着胸高（DBH）直径的增加而非线性增加。在树种之间或沿海拔高度，A（S）或最大TWU都没有变化。 450 N，650 N，650S和950 N的总年度冠层蒸腾量（E（C））分别为175、115、110和90 mm。 E（C）随着海拔的升高而下降，这是由于生长季节长度D和T（A）沿海拔升高的时间缩短了。在950 N处，显着（P <0.001）的气孔对D的变化具有较高的敏感性，从而导致该海拔下的年E（C）降低和水利用效率（WUE）降低。我们得出结论，沿研究的山坡存在E（C）的差异，这对应于T（A），D的变化，生长期的长短以及对D的气孔敏感性，这在建立森林集水区水平衡时应予以考虑。

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