福建东山县赤山滨海沙地厚荚相思林与湿地松林生物量和能量的研究

Study on Biomass and Energy of Acasia crassicarpa Forest and Pinus elliotti Forest on the Coast Sandy Soil Site

对滨海沙土的厚荚相思林与湿地松林生物量和能量进行了研究,结果表明:1)厚荚相思林现存生物量为 149.51t/hm2,其中干占总量的57.83%,根系占总量的12.82%,地上部分生物量是地下部分生物量的 6.81 倍;各组分干质量热值在19.98~23.48 kJ/g之间,整个林分平均干质量热值为20.59 kJ/g,能量现存量为3 079.16×106 kJ/hm2;2)湿地松林现存生物量为142.22 t/hm2,干占总量的35.35%,根占总量的32.88%,地上部分生物量是地下部分生物量的2.04倍;各组分干质量热值在20.53~21.54 kJ/g,整个林分平均干质量热值为21.00 kJ/g,能量现存量为2 986.28×106 kJ/hm2.3)厚荚相思和湿地松根系发达,可以克服沙地养分贫瘠,树干所占比例大,起着很好的防风效果,总体上有着较高的现存生物量;整个林分的平均热值高,反映厚荚相思和湿地松高的太阳能利用率,从这些特性可知它们对沿海沙地有很好的适应性,并起着很好的改善沿海沙地生态环境和提高生物多样性的作用.

The biomass and energy of Acasia crassicarpa forest and Pinus elliotti forest were studied,the results showed as follows:1) biomass and energy of Acasia crassicarpa forest were 149.51 t/hm^2 and 3 079.16×10~6 kJ/hm^2, respectively;There were some differences in gross caloric values among the various components (19.98~23.48 kJ/g) with the average gross caloric value of 20.59 kJ/g;2) those of the Pinus elliotti forest were 142.22 t/hm^2 and 2 986.28×10~6 kJ/hm^2,gross caloric values of fraction ranged from 20.53 to 21.54 kJ/g with the average value of 21.00 kJ/g.3) Both Acasia crassicarpa and Pinus elliotti forest had developed root system which supplied enough nutrients for them to grow fast on poor sandy site,high trunk ratio,and also great standing crop biomass,which could play a good effect on defending wind and fixing sandy;The high average caloric value of both forest reflected they had good adaptability and high utilization of solar energy on coastal sand.With those characters above,they were good species to advance environment and improve biodiversity of southeast of China.