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首页> 外文期刊>Taiwan Journal of Forest Science >Physiological Drought Tolerance of Tree Species Inhabiting the Ridge of the Kentlng Karst Forest
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Physiological Drought Tolerance of Tree Species Inhabiting the Ridge of the Kentlng Karst Forest

机译：居住在肯特喀斯特森林岭岭的树种的生理干旱耐受性

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摘要

The topography and tree species compositions significantly differ between the ridge and valley habitats of the Kenting karst forest, southern Taiwan. The objective of this research was to explore how tree species inhabiting the ridge habitat have adapted to the drought environment in terms of physiological traits and leaf morphology. Drypetes littoralis and Aglaia formosana, 2 species inhabiting the ridge, were investigated for this purpose. As a comparison, Pisonia umbellifera and Melanolepis multiglandulosa, 2 species inhabiting the valley, as well as Diospyros maritima which is distributed in both habitats, were also studied. Results showed that ridge species had a significantly higher leaf mass per area than did valley species. The predawn leaf water potential (PWP) during the dry season was significantly lower than that during the rainy season for each of the 5 species. The net photosynthetic rate (P_n) during the dry season was also significantly lower than that during the rainy season for 4 species, with the exception of P. umbellifera. During the dry season, the PWP of ridge species Dry. littoralis and A. formosana decreased to -3.40 and -3.69 MPa, respectively, indicating that these 2 species were suffering severe water stress, while the valley species were experiencing only mild water stress. Yet, these 2 ridge species still maintained positive P_n values at about 46 and 25%, respectively, of the P_n during the rainy season. Individuals of Dio. maritima growing in the ridge habitat showed a slightly lower PWP than that of the same species growing in the valley habitat (-1.88 vs. -1.29 MPa) during the dry season, but maintained the P_n at 62% of the P_n during the rainy season. To have their P_n values decline to 0, the PWPs of ridge species Dry. littoralis, A. formosana, and Dio. maritima would need to be as low as -5.89, -4.84, and -5.03 MPa, respectively. The results indicated that these 3 ridge species possessed a high physiological tolerance ability and could adapt to the stressful conditions of strong winds and water deficits in the ridge habitat during the dry season. Individuals of Dio. maritima growing in the ridge habitat showed both physiological and morphological acclimation to the drought environment.
机译：台湾南部凯斯特喀斯特森林的山脊和山谷栖息地之间的地形和树种组成显着差异。本研究的目的是探讨如何在生理特性和叶形形态方面适应稻田栖息地的树种。针对此目的，调查了Droypetes Littoralis和Aglaia Formosana，2种居住的物种。作为比较，还研究了荔枝丘脑和黑素肝炎群，其中2种居住的山谷，以及在两种栖息地分布的Diospyros Maritima。结果表明，山脊物种比谷物种的叶片质量显着更高。干燥季节的预先预先叶片水潜力（PWP）显着低于5种雨季期间的雨季。干燥季节的净光合速率（P_N）也明显低于4种雨季期间的净光合速率（P_N），但P.Mubellifera除外。在干燥的季节期间，脊髓的PWP干燥。 Littoralis和A. Formosana分别降至-3.40和-3.69MPa，表明这两种物种患有严重的水分压力，而山谷物种仅经历轻度水分胁迫。然而，这两个脊类物种仍然在雨季期间分别保持在P_N的约46％和25％的正P_N值。 DIO的个人。在山脊栖息地生长的Maritima略低于旱季谷栖息地（-1.88 vs. -1.29 MPa）的PWP略低，但在雨季期间将P_N保持在P_N的62％ 。让他们的P_N值下降到0，脊的PWPS干燥。 Littoralis，A. Formosana和DIO。 Maritima分别需要低至-5.89，-4.84和-5.03 MPa。结果表明，这3种岭物种具有高生理耐受能力，可以在干燥季节期间适应脊柱栖息地强风和水缺陷的压力条件。 DIO的个人。在山脊栖息地生长的Maritima向干旱环境表现出生理和形态驯化。

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