Tara Ecological Adaptability Research

Abstract This paper selects major spots in yongsheng county and yimencounty and kunming city and jingdong county and yuanjiang county. By means offield observing and lab experiment, the characters on botanical features andecological factors that affect on growing and economical value of tara (ligh andtemperature and water and soil and land forms and nature calamity and man-madecalamity) were studied. We determined these factors which restrict tara growing andpropagation. According to this study, we difined economical forestry of tara growingareas in Yunnan province, including the best adapation, general adaptation and asecological forestry areas.Analysis result shows that the tempendre and precipitation are the key factorsthat restrist fara growing and distribution and economical value. Usually tara growwell when the extreme lowest temperature is higher than -2℃.The blooming andfruiting of tara is occurred mainly in drought season,if the precipitation is over200mm during this period the economical value decreases. Oppositely if theprecipitation is less than ll0mm, tara become dwarf bush. Through comprehensiveanalysis we obtained that the best adapting conditions are:①the extreme lowesttemperature is higher than 0℃; ②the annual average temperature is higher than l8℃;③the precipitation is between ll0～200mm in dry season;④the relatively humidityis betwen 70～75% in dry season.The growing demand on soil is not strict, Tara cangrow well except on marshland and saline-alkali soil and clay soil .According to theabove mentioned conditions and actual land forms,we fond that the best adaptingareas were in the west of ailaoshan and the lower reach of nujiang rivers andlancangjiang river below l450m, genera adapting areas in the east of ailaoshan andin the middle and upper reach of yuanjiang river below l250m, ecological forestryareas in the middle reach of jinshajiang river below ll00m.