秦岭天然油松、锐齿栎林地土壤呼吸与CO_2释放  

SOIL RESPIRATION AND RELEASE OF CARBON DIOXIDE FROM NATURAL FOREST OF PINUS TABULAEFORMIS AND QUERCUS ALIENA VAR. ACUTESERRATA IN QINLING MOUNTAINS

作　　者：刘建军[1] 王得祥[1] 雷瑞德[1] 吴钦孝[1] 

机构地区：[1]西北农林科技大学,杨凌712100

出　　处：《林业科学》2003年第2期8-13,共6页Scientia Silvae Sinicae

基　　金：国家林业局"九五"重点项目 ( 96 30 )

摘　　要：应用密闭呼吸筒法研究了油松、锐齿栎林地土壤呼吸及其季节变化规律 ,结果表明 :(1 )林地土壤呼吸速率与气温和土壤温度之间具有显著的相关关系 ,呼吸速率与土壤温度的相关性高于和气温的相关性 ;(2 )通过建立土壤呼吸与根系生物量回归方程 ,计算出了根系呼吸量 ;(3 )锐齿栎林地年CO2 释放量为 2 8 2 5 2t·hm- 2 a- 1 ,其中矿质土壤呼吸占 67 5 0 % ,根系呼吸占 2 3 81 % ,凋落物层呼吸占 8 69% ;油松林地释放的CO2 量为 2 2 3 2 3t·hm- 2 a- 1 ,其中矿质土壤呼吸占 61 0 1 % ,根系呼吸占 3 1 1 4 % ,凋落物层呼吸占 7 84 %。Soil respiration and its seasonal change of forest of Pinus tabulaeformis and Quercus aliena var.acuteserrata were studied by using the seal respiration tube.The results showed that (1) there were significant correlations between soil respiration rate air temperature or soil temperature,and the correlation of soil respiration rate and soil temperature was better than that of soil respiration rate and air temperature;(2)roots' respiration was calculated by setting a equation of soil respiration and roots biomass;(3)The carbon dioxide released from forest land of Quercus aliena var.acuteserrate was 28.252 t·hm -2a -1,of which carbon dioxide released from respiration soil roots and litter layer were about 67.5%,23.81% and 8.69% respectively.The carbon dioxide released from forest land of Pinus tabulaeformis was 22.323 t·hm -2a -1,of which carbon dioxide from soil,root and litter layer was 61.01%,31.14% and 31.14% respectively.

关 键 词：油松 锐齿栎 林地 土壤呼吸 CO2 二氧化碳 

分 类 号：S714[农业科学—林学]