不同海拔梯度油松和锐齿栎群落能量分布特征  

Characteristics of energy distribution of Pinus tabulaeformis and Quercus aliena var.acuteserrata communities along an altitudinal gradient

作　　者：李晶晶[1,2] 党坤良[1,2] 唐朋辉[1,2] 

机构地区：[1]西北农林科技大学林学院,陕西杨凌712100 [2]陕西秦岭森林生态系统国家野外科学观测研究站,陕西宁陕711600

出　　处：《生态学杂志》2013年第10期2647-2653,共7页Chinese Journal of Ecology

基　　金：林业公益性行业科研专项(201204502)资助

摘　　要：通过对秦岭中段南坡不同海拔梯度油松和锐齿栎天然林生物量、热值、灰分含量和含碳率分析,揭示不同海拔油松和锐齿栎林生物量和能量的分配规律。结果表明:油松和锐齿栎林生物量及能量现存量均随海拔升高呈先升后降的趋势,油松和锐齿栎林总生物量分别在海拔1500~1600和1400~1500 m最高,分别达263.94和278.71 t·hm^(-2),总能量现存量则均在海拔1400~1500 m最高,分别达5715.38和5756.13 GJ·hm^(-2)。在相同海拔梯度,油松热值和含碳率均高于锐齿栎,灰分含量则相反。油松各器官热值和平均热值随海拔升高而增大,锐齿栎皮热值和平均热值则随着海拔的升高而减小。油松和锐齿栎平均含碳率都随着海拔的升高而升高,灰分含量未随海拔的变化表现出规律性。不同海拔油松热值、灰分含量和含碳率分别为20.39~21.47 kJ·g^(-1)、2.81%~3.54%和46.20%~50.50%,锐齿栎热值、灰分含量和含碳率分别为19.69~20.18 kJ·g^(-1)、6.15%~7.77%和42.06%~44.15%。不同海拔油松热值和含碳率差异显著,灰分含量差异不显著;锐齿栎灰分含量和含碳率差异显著,热值差异不显著。可以认为,中海拔的微生境更适宜油松和锐齿栎的生长,群落对环境更为适应。In this paper, the biomass, caloric value, ash content, and carbon content of natural Pinus tabulaeformis and Quercus aliena var. acuteserrata communities along an altitudinal gradient on the southfacing slope of middle Qinling Mountains, China were determined, aimed to explore the distribution patterns of the two communities＇ biomass and energy at different altitudes. With the increase of altitude, the standing biomass and energy of the two communities decreased after an initial increase. The total biomass of P. tabulaeformis and of Q. aliena var. acuteserrata was the highest at altitude 1500-1600 m and 1400-1500 m, being 263.94 t·hm-2 and 278.71 t·hm-2, respectively, while the total energy was all the highest at altitude 1400-1500 m, being 5715.38 GJ·hm-2 and 5756.13 GJ·hm-2, respectively. At the same altitudes, the caloric value and carbon content of P. tabulaeformis were higher than those of Q. aliena var. acuteserrata, but the ash content was in opposite. The caloric value and average caloric value of different organs of P. tabulaeformis increased with increasing altitude, while those of the bark of Q. aliena var. acuteserrata were in adverse. The average carbon content of P. tabulaeformis and of Q. aliena var. acuteserrata increased with increasing altitude, while the ash content had no regularity. The caloric value, ash content, and carbon content of P. tabulaeformis at different altitudes were 2039-21.47 kJ·g-1, 2.81%-3.54%, and 46.20%-50.50%, while those of Q. aliena var. acuteserrata were 19.69-20.18 kJ·g-1, 6.15%-7.77%, and 42.06%-44.15%, respectively. For P. tabulaeformis, significant differences were found in the caloric value and carbon content at different altitudes, but little difference was observed in the ash content. For Q. aliena var. acuteserrata, significant differences were found in the ash content and carbon content at

关 键 词：油松 锐齿栎 海拔 热值 含碳率 

分 类 号：S718.54[农业科学—林学]