Research On Adaptability Evaluation Of Three Eucalyptus Clones In Fujian North Rim Region

This research mainly through the investigation and analysis of 2～7 a DH32-29,DH201-2,U6 three eucalyptus clones in northern region of fujian province for growth and cold resistance and the altitude,site quality grades,the relationship between fertilization measures,compare the differences between three clones,so as to correctly evaluate the adaptability of three eucalyptus clones in the northern region of fujian province level,in order to provide theoretical guidance for the guidance in the area of eucalyptus management.The main conclusions of the study are as follows:(1)under the condition of the site quality grades are a category Ⅱ,low altitude area three eucalyptus clones DH32-29,U6,DH201-2 average diameter at breast height,average height,volume per hectare to be higher than the high altitude area,and a significant difference.At the same time,under the same altitude,2-4 a born three eucalyptus clones in the three growth indicators were significantly different,when the altitude 300 m and 300～500 m or less,2-4 a raw DH32-29 growth are the best followed by U6,the worst is DH201-2.(2)under the condition that the height of the above ground is less than 300m,the growth of DH32-29 is the best,followed by U6 and DH201-2.At the same time,the site quality of different grades of three clonal growth further do Duncan multiple comparison analysis of knowable Ⅰ,Ⅱ earth-like,three growth of eucalyptus clones not significantly differences between Ⅰ,Ⅱ terrestrial and Ⅲ various growth indexes exist obvious differences between terrestrial.Therefore,the northern region of fujian province of eucalyptus afforestation had better choose soil fertile Ⅰ,Ⅱ class,on the ground part of the soil deep classⅢ afforestation,should increase the intensity of fertilization.(3)the study of the impact of number of fertilization,fertilization of eucalyptus for three consecutive years of mean DBH,mean height,volume per hectare are better than fertilization 1 to 2 times of eucalyptus,followed by two years in a row of fertilization of eucalyptus,only the first year of fertilization of eucalyptus growth condition is the worst.Therefore,fujian north rim region in the development of cultivation of eucalyptus,shall be under the early enough basal,appropriate to nitrogen or eucalyptus fertilizer at the same time,to ensure fertilizer balance,eucalyptus can get the best growth.(4)three eucalyptus clones of 2～5a were selected for the study of freezing damage.The results showed that the cold tolerance of three eucalyptus clones was significantly different.Among the 3 eucalyptus clones of 2-5a,DH201-2 was the largest,followed by U6,and DH32-29 was the smallest.At the same time,with the increase of forest age,the cold tolerance of three eucalyptus clones also increased,and the difference of cold tolerance between the three clones also decreased.(5)in the site quality grade for Ⅰ,Ⅱ terrestrial and at an altitude of 300 m or less,2-7-a between the three clones of average diameter at breast height,average height,volume per hectare as biggest DH32-29,followed by U6,the smallest is DH201-2.At the same time,the 3 a,5 a,7 a the growth indexes of three clones as Duncan multiple comparison analysis of knowable DH32-29 and growth indicators U6 differences were not significant,but DH32-29,U6 and DH201-2 there are significant differences.By subordinate function calculation and comprehensive analysis,from 2 a to 5 a,three clones of the highest scores are DH32-29,followed by U6,the last is DH201-2,in the northern region of fujian province,DH32-29 best growth adaptability,good adaptability of U6,DH201-2 growth adaptability is relatively poor.At the same time,with the growth of forest age,the growth adaptability gap between DH201-2 and DH32-29 tends to narrow.DH32-29,for example,its growth condition compared with other regions,the results showed that the northern region of fujian province for growth and the economic benefit is lower than fujian eucalyptus clones suitable region,but more than general production areas in fujian.(6)comprehensive evaluation of adaptability of three eucalyptus clones in the northern margin of fujian province:Studies on the effects of altitude,site quality and fertilization times show that DH32-29 is the best index,but it is the most severe frost damage in the aspect of cold resistance.With the growth condition compared with other regions,the DH32 of the northern region of fujian province-29 volume per hectare than suitable region of fujian province is low,but higher than fujian general production areas,known in the northern region of fujian province to build DH32-29 can get very good growth and economic benefits.And U6 ranked second in all growth statistics results of different factors influencing research,and also performed well in cold tolerance research.It can be seen that creating U6 in the northern edge of fujian province can achieve good growth and economic benefits.However,the statistical results of DH201-2 different factors influencing the growth rate of the study were the worst,but they were the best in the study of cold tolerance.