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通过对防护林体系光能吸收率的研究得知, 在防护林体系庇护范围内的作物和草的光能吸收率及净初级生产力均比体系外无林对照区高。表明防护林体系在一定程度上改变了体系内农田活动层太阳辐射能的再分配, 起到调节体系内作物生长小气候的作用。林分的光能吸收率及净初级生产力较农地作物为高, 显著高于草地。
Through the study of light energy absorption rate of shelterbelts system, it was found that the light energy absorption rate and net primary productivity of crops and grasses sheltered in the shelter forest system were higher than those outside the system. It shows that the shelterbelt system has changed the redistribution of solar radiation in the active layer of farmland to a certain extent and played the role of regulating the microclimate of crops in the system. The light energy absorption rate and net primary productivity of stand were higher than that of farmland, significantly higher than that of grassland.