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林带遮荫是护田林胁地的主要因子之一。由于遮荫,林冠拦截了大量的太阳辐射,降低了光照强度,影响了被遮范围的有效日照长度及光合速率,使农作物收获量低于非遮荫区。面对这一现实情况,从事控制林带胁地研究的人,首先要弄清楚的是,林带遮荫范围究竟有多大,其中有没有变化规律,并且都与哪些因子有关。我认为,影响林带遮荫范围的主要因素是林带所处的地理位置,林带高度与走向和太阳高度角、方位角。在一定的
Shelterbelt is one of the main factors that protect the tilling land. Due to shading, the canopy intercepts a large amount of solar radiation, reduces the light intensity, affects the effective sunshine length and photosynthetic rate of covered area, and makes the crop yield lower than the non-shady area. Faced with this reality, people who are engaged in the study of forest belt control should first make clear what is the extent of forest shade, whether there is a law of change among them, and which factors are involved. In my opinion, the main factors affecting the shade of the forest belt are the geographical location of the forest belt, the height and direction of the forest belt and the elevation and azimuth of the sun. In certain