摘要
本文通过在北京山地３种温带森林中为期一年的观测，得到了土壤呼吸速率与地下５ｃｍ土壤温度之间的函数关系。据此并根据气象资料推算得到了白桦林、辽东栎林和油松林的年土壤呼吸量分别为１１３２ｇＣＯ２ｍ－２ａ－１，１４３ｇＣＯ２ｍ－２ａ－１和８６６ｇＣＯ２ｍ－２ａ－１。与国外同纬度地区相比，该地年土壤呼吸量偏低。结果还显示，土壤呼吸与地下５ｃｍ土壤温度的相关性好于与地表温度的相关性，并且水分含量对土壤呼吸也有影响。１９９４年秋季进行的昼夜连续观测表明，日土壤呼吸速率最高的时刻在中午１２：００～下午４：００，最低的时刻在黎明前５：００～６：００。
One year measurement of soil respiration rate was carried out in three mountainous temperate forests in Beijing, Betula platyphylla, Quercus liaotungensis and Pinus tabulaeformis forests.The relationships between the soil respiration rates (SRR) and soil temperature at 5 cm depth (ST 5cm) were obtained.The rates were used to estimate annual soil respiration amount of these three forests. As a result, the annual soil respiration amount was estimated as 1132 g CO 2·m -2 ·a -1 for B. platyphylla forest, 1431 g CO 2·m -2 ·a -1 for Q.liaotungensis forest, and 866 g CO 2·m -2 ·a -1 for P.tabulaeformis forest, showing smaller values than those obtained from other regions with similar other latitudes in the world.Whole day's measurements in fall of 1994 show that the daily highest SRR values were at 12:00 am～4:00 pm, and the lowest at 5:00～ 6:00am .
出处
《植物生态学报》
CAS
CSCD
北大核心
1998年第2期119-126,共8页
Chinese Journal of Plant Ecology
基金
国家八五科技攻关课题
国家杰出青年科学基金
关键词
北京
温带森林
土壤呼吸速率
年土壤呼吸量
Annual soil respiration amount, Beijing, Soil respiration rate, Soil temperature at 5 cm depth, Temperate forest
