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一、前言湖南省位于北纬24°39′-30°08′,东经108°47′-114°15′。属中亚热带季风湿润气候。南北和东西相差五个纬度和五个经度,加之地形起伏,最大高程差达一千九百多米,形成复杂多样的自然气候条件。全省种植业以稻作为主,平均每个农业劳力负担稻田1.96亩。建国以来,随着生产的发展,稻田种制经历了几次改革和调整,复种指数由1949年
I. Introduction Hunan Province is located at latitude 24 ° 39’-30 ° 08 ’and longitude 108 ° 47’-114 ° 15’. Is a subtropical humid monsoon climate. The difference between north and south and east-west difference of five latitudes and five longitudes, combined with the undulating topography, has a maximum elevation difference of over 1,900 meters, forming a complex and diverse natural and climatic conditions. The province’s planting industry is dominated by rice, with an average of 1.96 mu of paddy fields per agricultural laborer. Since the founding of the People’s Republic of China, with the development of production, the paddy field system has undergone several reforms and adjustments. The multiple cropping index was changed from 1949