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一、引言凤县地处北纬33°34′-34°18′,东经106°24′-107°07′的秦岭山脉西南麓,为暖温带与北亚热带过渡区。县境内高山纵横,河谷交错,平坦之地极少。因其特殊的地理环境和与之相应的复杂气候条件,历来林牧特产在全县国民经济中占有至关重要地位。由于该地苹果发展快,幼树结果早,果实色泽艳丽,风味浓,肉质脆及耐贮藏等特点,曾于1974年被国家正式批准,划为外销基地。每年约有1/3的苹果出口。笔者为了探索和揭示影响凤县苹果生态环境的气候问题,在统计分析有关气象资料的基础上,并作了一
I. INTRODUCTION Fengxian County is located in the transitional zone between warm temperate zone and north subtropical zone at the southwest foot of Qinling Mountains at latitude 33 ° 34’-34 ° 18 ’and longitude 106 ° 24’-107 ° 07’E. County alpine vertical and horizontal, staggered valley, very little land. Because of its special geographical environment and the corresponding complex climatic conditions, always pastoral specialty in the county’s national economy occupies a crucial position. Due to the rapid development of the apple in the area, early results of saplings, beautiful color of the fruit, rich flavor, crispness and storage of stools were officially approved by the state in 1974 and designated as export bases. About one-third of Apple’s exports each year. In order to explore and reveal the climatic problems affecting the ecological environment of Fengxian Apple, based on the statistical analysis of relevant meteorological data,