苏北泥质海岸水杉林地土壤的异养呼吸  

Soil heterotrophic respiration of metasequoia shelter forests in silting coastal area of northern Jiangsu province

作　　者：孔雨光[1,2] 王因花[1] 张金池[1] 储冬生 张东海[1] 王如岩[1] 张小庆[1] 

机构地区：[1]南京林业大学,江苏省林业生态工程重点实验室,江苏南京210037 [2]山东省林业监测规划院,山东济南250014 [3]江苏省大丰林场,江苏盐城224100

出　　处：《南京林业大学学报（自然科学版）》2010年第1期15-18,共4页Journal of Nanjing Forestry University：Natural Sciences Edition

基　　金：“十一五”国家科技支撑计划(2006BAD03A140301)

摘　　要：采用碱液吸收法对苏北泥质海岸15年生水杉（Metasequoia glyptostroboides Hu＆Cheng）林地的土壤异养呼吸进行了测定。结果表明：水杉林地2—10月土壤异养呼吸速率CO2变化范围为4．72～12．87g／（m^2·d），最大值出现在7月，最小值出现在2月。土壤温度是影响土壤异养呼吸的主要因子，温度变化能够解释土壤异养呼吸季节变化的62．1％-70．9％，土壤含水量与土壤异养呼吸的关系不显著。利用林内气温及地表下2、5、10cm处的土壤温度得到水杉林地的Q10值分别为1．00、1．59、1．55、1．54。Soil heterotrophie respiration is an important part of forest carbon cycle ; therefore, studies on this topic will help to explore the causes for global climatic change. Soil heterotrophic respiration of 15-year old metasequoia plantation was investigated in silting coastal area of northern Jiangsu province and soil CO2 efflux was measured in situ with the static alkali absorption method. Results showed that soil heterotrophic respiration rate of the metasequoia plantation between February and October varied from 4.72 to 12.87 g/（ m^2·d）, the largest soil respiration rate occurred in July and the smallest appeared in February. Temperature was the limiting factor to soil respiration. The Q10 values were calculated with forest air temperature and the soil temperature of 2, 5, 10 cm soil depth were 1.00, 1.59, 1.55 and 1.54, respectively. These results are important to future studies on soil respiration of silting coastal plantations and provide basic data for the further research in carbon circle.

关 键 词：土壤异养呼吸 温度敏感性 沿海防护林 水杉林 

分 类 号：S714.2[农业科学—林学]