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首页> 外文会议>25th Conference on Agricultural and Forest Meteorology and 12th Joint Conference on the Applications of Air Pollution Meteorology with Aamp;WMA and Fourth Symposium on the Urban Environment May 20-24, 2002 Norfolk, Virginia >DISSIPATION AND PARTITIONING OF ENERGY WITHIN JACK PINE AND DOUGLAS-FIR
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DISSIPATION AND PARTITIONING OF ENERGY WITHIN JACK PINE AND DOUGLAS-FIR

机译：杰克松树和道格拉斯冷杉中能量的耗散和分配

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Although the energy budget closure was generally high (e.g., > 90%) we did not observe complete equality. However, our deficit is comparable to that of other coniferous sites (Berbigier et al., 2001; Turpinseed et al., 2001). Furthermore, even though soil heat flux was small during the course of a day, it cannot be neglected in the energy budget on a monthly basis. As indicated by the generally high average Bowen ratios throughout the measuring periods, evapotranspiration at all three sites was low. Therefore, it is likely that these stands are all somewhat water-limited during the growing season. It is also possible that during periods when sensible heat is less dominant, the productivity of the forest will increase. At this point, more water will move through the plants, thereby increasing rates of growth and photosynthesis. Perhaps one of the most interesting findings in this study concerns the dissimilarity of energy budget terms among the three stands. These differences are most likely due to the variations in vegetation types, microclimates, soils, and disturbance regimes. Comparative studies, such as this one, can help us more accurately assess how modifications in land-use will affect productivity across a variety of ecosystems.
机译：尽管能源预算关闭率普遍很高（例如> 90％），但我们并未观察到完全平等。但是，我们的赤字与其他针叶树种的赤字相当（Berbigier等，2001； Turpinseed等，2001）。此外，即使土壤热通量在一天的过程中很小，但在每月的能源预算中也不能忽略它。如在整个测量期间总体上较高的平均鲍文比所表明的那样，所有三个位置的蒸散量都很低。因此，在生长季节中，这些林分很可能全部受水限制。在显热较少占主导的时期，森林的生产力也有可能增加。此时，更多的水将流过植物，从而提高生长速度和光合作用。这项研究中最有趣的发现之一可能涉及三个机架之间的能源预算条款的不同。这些差异最有可能是由于植被类型，小气候，土壤和干扰状况的变化所致。诸如此类的比较研究可以帮助我们更准确地评估土地利用的变化将如何影响各种生态系统的生产力。

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