| This paper started the research on five provenances of Cupressus lusitanica and six-year-old artificial young growth in Baima scientific research base of Lishui district,study the dynamic of calorific value and energy characteristics,provide a theoretical basis for the breeding of energy tree species.Specifically measuring and analysing the growth?calorific value and energy characteristics of different organs respectively,and using the main component-cluster analysis method to make a preliminary evaluation.The results of the study are as following:(1)The growth patterns concerning height,DBH and basal diameter of five provenances of leaves and branch were all “s” type,but their growth potential was different from each other.The five provenances biomass all take the trunk as the dominant and the distribution proportion of each organ was trunk>branch>root>leaf;Except for the slight difference between leaves and roots,the biomass of other organs was significantly different(p<0.01).As a whole,the total biomass of D2 provenance makes the majority and there were huge differences between different provenance.Finally the order of size was D2>D4>D1>D3>D5.(2)The seasonal variation trend was “v” shape in GCV and AFCV from five provenances,and the order was winter>autumn> spring>summer;The average value of each season was D3>D4>D2>D5>D1.The distribution of GCV of each organ in five provenances(leaves,branch,bark,trunk,root)was consistent,which showed that branch>leaves>trunk>bark>root;Except for D1 provenance,AFCV was highest in leaves,lowest in roots,and the order was leaves>bark>branches>trunk>roots.The average GCV and AFCV of five provenances were 20.56 KJ/g and 21.32 KJ/g;The GCV and AFCV of D3 provenances reached the maximum,and there was significant difference between the minimum of D1 provenances.Which means the overall order was D3>D4>D2>D5>D1.The energy storage in each organ of five provenances of Cupressus lusitanica followed the rule of trunk > branch > leaves > root,accounting for 72.72%,13.24%,7.1% and 6.95% of the total energy storage capacity.The order of the total energy storage capacity of young Cupressus lusitanica forest was consistent with biomass.(3)The seasonal variation trend of cellulose content and crude protein content in Cupressus lusitanica leaf from five provenances was inverted “v” shape,and the highest value appeared in autumn;The seasonal variation trend of leaf lignin content,tannin content,ash content and water content was “v” shape,and the highest value appeared in spring;The seasonal variation trend of leaf benzene alcohol extract content and crude fat content also showed a “v” shape,but the highest value appeared in winter and the lowest value appeared in summer;The seasonal variation trend of leaf soluble sugar content and starch content was similar,both of them decreased first and then increased and then decreased,the lowest value appeared in summer,while the highest value appeared in autumn and spring respectively.The seasonal variation trend of soluble sugar content,tannin content,ash content and water content in five provenances of Cupressus lusitanica branches was “v” shape,and the highest value appeared in spring;The seasonal variation trend of branch starch content and benzene alcohol extract content both decreased first and then increased and then decreased,the lowest value appeared in summer,while the highest value appeared in spring and autumn respectively;The seasonal variation trend of branch the cellulose content was inverted “v” shaped,and the overall order was autumn> winter> summer> spring;The lignin content of branches decreased with the seasons changing,and the highest value appeared in spring;The crude protein content of branches increased with the seasons,the highest value appeared in winter,and the lowest value appeared in spring.(4)The distribution of cellulose and lignin content in different organs of five provenances of Cupressus lusitanica was complicated,and the cellulose content in trunk was the highest and lignin content was lower;The distribution of water content in organs was roots> bark > trunk > leaves > branch;The contents of soluble sugar,benzene alcohol extract,tannin and crude protein were the highest in leaves and the lowest in trunk;Ash,starch and crude fat were the highest in bark and the lowest in trunk;The average ash content in each organ of five provenances ranged from 2.87 % to 4.11 %,and the overall order was D1> D5> D2 > D4> D3.The average values of cellulose,soluble sugar and water content of various sources were 18.51%-19.97%,2.37%-2.69%,55.79%-57.63% respectively,and the maximum average value was D2;The average content of crude fat,benzene alcohol extract and tannin from different provenances ranged from 4.80% to 5.23%,from 6.38% to 8.29%,from 3.75% to 5.79% respectively,and the maximum value was D3;The crude protein content of D4 and lignin and starch content of D5 were the highest.The calorific value of Cupressus lusitanica was positively correlated with crude fat content and tannin content,and negatively correlated with ash content;Ash content was negatively correlated with crude fat content,tannin content and crude protein content;Tannin content was positively correlated with crude protein content and crude fat content;The lignin content was negatively correlated with the benzene alcohol extract content.(5)The seasonal variation trend of N and S element contents in Cupressus lusitanica leaf was inverted “v” shape,and the highest values appeared in autumn and summer respectively;The seasonal variation trend of C element content in leaves was “v” shape.The provenance which has the highest content of C and N elements in leaves was D4,and the provenance with the highest content of S element was D3.The contents of C and N elements in the branches of five provenances of Cupressus lusitanica increased with the changes of season,and the highest value appeared in winter while the lowest value in spring;The content of S elements in branches increased first and then decreased and then increased with the changes of season,finally the highest value appeared in summer and the lowest value in autumn.The provenance with the highest content of C element in branch was D4;The provenance with the highest content of N element was D3;And the provenance with the highest content of S element was D1.(6)The contents of N and S element in leaves were the highest and in trunk were the lowest among the five provenances;The contents of C element was the highest in trunk and lowest in bark;The provenance with the highest content of C and N elements in 5 provenances was D4,and the provenance with the highest content of S element was D3.There was a positive correlation between C,N,S elements and caloric value of Cupressus lusitanica.N element content was significant positively correlated with crude protein content and tannin content,while significant negative correlated with ash content;There was a significant positive correlation between S element content and soluble sugar content.(7)Compared with other biomass species,Cupressus lusitanica plays a good role in the aspect of caloric value,chemical composition,growth status and adaptability which means it is suitable for cultivation as biomass energy plants.The results of principal component-cluster analysis showed that the provenances D1 and D2 performs better in growth,and the provenances D3 and D4 showed better result in energy.The order of comprehensive score size was D4>D3>D2>D1>D5,among which,the provenances D4 had the best comprehensive performance of energy characteristics,high caloric value,large growth volume and rich energy-containing substances.Based on the all above research,I recommend provenances D4 as the main cultivation object of high-quality Cupressus lusitanica energy forest. |
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