| 边缘效应带和保留带内红松幼林水分生态的差异 |
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| 引用本文： | 祖元刚,王文杰,王慧梅.边缘效应带和保留带内红松幼林水分生态的差异[J].植物生态学报,2002,26(5):613-0. |
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| 作者姓名： | 祖元刚 王文杰 王慧梅 |
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| 作者单位： | 东北林业大学森林植物生态学教育部重点研究实验室,哈尔滨,150040 |
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| 摘 要： | 以一个经过12年边缘效应带处理的14年生红松(Pinus koraiensis)(1998年)幼林生态系统为研究对象，对处于不同宽度的边缘效应带和保留带的红松幼树木质部水势、叶片蒸腾强度、气孔导度、叶片温度、空气相对湿度和光合有效辐射的日变化以及土壤相对含水量进行了分析，结合叶片净光合速率探讨了效应带宽度对红松幼林生态系统中红松幼树水分生态及红松生长状况的可能影响模式。结果表明：1）边缘效应带的开拓降低了效应带内红松幼树木质部水势、空气相对湿度和叶片气孔导度，显著提高了叶片蒸腾强度、叶片温度和光合有效辐射
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| 关 键 词： | 红松 边缘效应带 木质部水势 蒸腾速率 气孔 |
| 修稿时间： | 2001年6月13日 |
DIFFERENCES IN WATER ECOLOGY OF A YOUNG PINUS KORAIENSIS STAND GROWN IN EDGE-EFFECT BELTS AND RESERVED BELTS |
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| ZU Yuan-Gang,Wang Wen-Jie and Wang Hui-Mei.DIFFERENCES IN WATER ECOLOGY OF A YOUNG PINUS KORAIENSIS STAND GROWN IN EDGE-EFFECT BELTS AND RESERVED BELTS[J].Acta Phytoecologica Sinica,2002,26(5):613-0. |
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| Authors: | ZU Yuan-Gang Wang Wen-Jie and Wang Hui-Mei |
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| Abstract: | A 14-year-old Korean pine (Pinus koraiensis) forest (as of 1998), afforested after clear-cutting of 4 m-, 6 m- and 8 m-width edge-effect belts in an oak (Quercus mongolica) secondary forest in 1986 (with a 10 m-width undisturbed belt close to each edge-effect belts), was studied to evaluate the impact of width of edge-effect belts on water ecological characteristics and growth status of Korean pine. Four meter, 6 m and 8 m strip-cutting belts were chosen as treatment of edge-effect belts and the 10 m undisturbed neighbor belts acted as reserved (control) belts. Both water ecological parameters (xylem water potential, foliar transpiration rate, stomatal conductance for water, soil water content) and non-water ecological parameters (leaf temperature, photosynthetic active radiation, net photosynthesis rate) were measured in this study. The results showed that: 1) the treatment of edge-effect belts could strongly decrease xylem water potential of Korean pine and air relative humidity. Considerable improvements in leaf transpiration rate, leaf temperature, photosynthetic active radiation and a sharp decrease in stomatal conductance were also observed, especially in the 8 m edge-effect belt; 2) soil water content of the edge-effect belts in superficial layer (0-5 cm) was lower than the counterpart in control belts, which might be due to strong evaporation from the soil surface to the atmosphere near ground. However, significantly higher water content in deep layer (20-25 cm) of the edge-effect belts was observed, which might be related to the high water demand of adult oak trees in the reserved belts. This hypothesis needs further research. Furthermore, our results showed that leaf transpiration rate and air humidity, rather than soil water content, correlated with xylem water potential with a significant Pearson-correlation value, indicating the former might contribute more to the diurnal pattern of xylem water potential. Considering the growth performance, foliar photosynthesis traits and water ecological characteristics of Korean pines as well as the microenvironmental differences in different edge-effect belts and reserved belts, our results indicate that wide edge-effect belts (e.g.8 m) might decrease the growth of Korean pine by lowering xylem water potential and subsequently causing a midday depression in photosynthesis, while very narrow edge-effect belt (e.g. 4 m) cannot efficiently improve the growth of Korean pine in it because the slight improvement in light condition only resulted in a slight increase in carbohydrate accumulation from foliar photosynthesis. However, a suitable width of edge-effect belt, for example, 6 m in our case, could improve the light condition and adjust the water status of Korean pine. Using a 6 m edge-effect belt improved the growth of Korean pine most in our three treatments (4 m, 6 m and 8 m). This conclusion will be beneficial to the regeneration of Korean pine stands using edge-effect belt treatments in northeast China. |
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| Keywords: | Pinus koraiensis Edge-effect belt Xylem water potential Leaf transpiration rate Stomatal conductance Soil water content |
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