摘要
对韩国广陵树木园的阔叶林、针叶林和针阔混交林的土壤呼吸排放量进行观测、分析和比较 ,研究土壤呼吸与环境因子之间的相互关系 ,从中探究各森林植被类型之间产生土壤呼吸差别的原因。利用Q10 模型计算出阔叶林、针叶林和针阔混交林的土壤呼吸Q10 值为 3 6、3 8和 3 2 ,再根据对当地各观测站土壤温度的连续观测数据 ,计算出阔叶林、针叶林和针阔混交林的土壤呼吸日均排放量 ,依次分别为CO2 15 12、15 10和 13 99gm-2 。
In order to elucidate carbon cycling in the forest ecosystem, respiration of soils under deciduous ( Quercus acutissima , Acer palmatum Thunberg and Fraxinus rhynchophylla Hance ), coniferous ( Pinus koraiensis ) and mixed ( Pinus koraiensis, Quercus acutissima and Acer palmatum Thunberg) forests and its environmental factors were investigated in Kwangneung Experimental Forest, Pochun gun, Gunggi do, Korea In situ soil respiration was being measured for a 16 month period between August 2001 and December 2002 using Pp systens EGM 4 (IRGA) For each measurement, soil temperature, gravimetric water content, soil organic matter content, total organic carbon, total nitrogen and carbon to nitrogen ratio in the subsoil 10cm depth were also determined Relations between soil respiration and their environmental factors were analyzed, and causes leading to difference between three forests were found out Results indicated that soil respiration rates from the forest soil were strongly related to soil temperature The highest correlation was found with the soil temperature at the depth of 10 cm, and soil respiration rates increased exponentially with increase in soil temperature Thus, soil temperature was the primary abiotic determinant of soil respiration rates in this study Q 10 model was used to figure out the Q 10 value of the decidous, coniferous and mixed forest soils, being 3 6 ( r 2=0 66), 3 8 ( r 2=0 63) and 3 2 ( r 2=0 63), respectively The daily mean soil respiration rate was CO 2 15 12,15 10 and 13 99 g m -2 d -1 , respectively No difference was found between deciduous and coniferous forests, but difference did exist between mixed forest and the others Other than that no environmental factors had any significant effect However, when temperature was not a limiting factor, soil water content had some effect on forest soil CO 2 efflux A modeling examination showed in summer (20℃), soil respiration rates increased exponentially with increase in soil water content, whereas in winter (4℃), soil respiration rates decreased exponentially with increase in soil water content In spring and autumn (10℃), there was no apparent effect of soil water content
出处
《土壤学报》
CAS
CSCD
北大核心
2004年第4期564-570,共7页
Acta Pedologica Sinica
基金
韩国环境部<下一代核心环境技术开发事业>中"韩半岛地区陆地生态界的CarbonFlux监视技术开发"
韩国国立汉城大学科研补助基金
韩国科学基金(2000-2-51300-002-3)资助
