论文部分内容阅读
烟台市的地貌,约有69%是山地、丘陵。许多未经开发利用的荒山坡,如能有计划、因地制宜地发展果树,既可绿化环境,保护生态平衡,又能增加收入,是山区致富的重要出路。山区栽果树,具有以下几个优越条件:一、温差大。据研究,海拔高度每上升L00米,气温下降约0.65℃。因而,丘陵、山地的气温日较差较平原大得多。山区土壤,由于含水量低,土壤热容量小,土温通常较平原地高。土温高有利于根系生长;温差大有利于树体养分积累、花芽分化及果实膨大。二、光照充足。研究证明,垂直高度每升高100米,光照强度平均增加4.5%,紫外
About 69% of the landform in Yantai City is mountains and hills. Many unspoilt barren slopes, if they can plan and develop fruit trees according to local conditions, can not only green the environment, protect the ecological balance, but also increase their incomes, which are important outlets for mountain areas to get rich. Planting fruit trees in the mountains, with the following advantages: First, the temperature difference. According to the study, every elevation L00 meters above sea level, the temperature dropped about 0.65 ℃. Thus, the hilly and mountain temperatures are far worse than the plain. Mountain soil, due to low water content, soil heat capacity is small, soil temperature is usually higher than the plain. Soil temperature is conducive to root growth; temperature difference is conducive to the accumulation of tree nutrients, flower bud differentiation and fruit enlargement. Second, adequate lighting. Studies have shown that for every 100 meters of vertical elevation, the light intensity increases by an average of 4.5% over UV