人工桤柏混交林生态系统的能量特征

Energy characteristics of alder cypress mixed plantation ecosystem.

对川中丘陵区 1 1年生人工桤柏混交林生态系统能量特征的研究表明 ,植物热值含量随植物种类、器官、分布层次以及季节等的变化而变化 ;生态系统的能量现存量为2 37.53× 1 0 1 0 J·hm- 2 ,每年以凋落物形式归还的能量为 7.55× 1 0 1 0 J·hm- 2 ·a- 1 ,其中凋落叶是系统能量归还的主要形式 ,其能量归还量占能量归还总量的 70 .2 9% ;生态系统能量净固定量为 2 6.73× 1 0 1 0 J·hm- 2 ·a- 1 ,能量转化效率为 2 .34% ,可见人工桤柏混交林具有较高的能量固定能力和太阳能转化效率 .

Studies on the energy characterisitcs of 11 years old alder cypress mixed plantation ecosystem in hilly area of central Sichuan Province show that the caloric value of plant varied with species, organs, distributive layers and seasons. The standing energy storage of the ecosystem was 237.53 ×10 10 J·hm -2 , and the energy return in the form of litterfall was 7.55×10 10 J·hm -2 ·yr. -1 , 70.29% of which was in the form of leaf fall. Net energy fixation was 26.73×10 10 J·hm -2 ·yr. -1 , and energy conversing efficiency was 2.34%. It is suggested that the alder cypress mixed plantation is an ecosystem with high energy fixation and high energy conversing efficiency.