长白山地区红松和紫椴倒木呼吸研究

该文采用静态箱-气相色谱技术，对红松和紫椴倒木呼吸及其与腐烂等级、温度、含水量等因子间关系进行了研究，并对长白山阔叶红松林内倒木总呼吸进行了估算。结果显示，倒木呼吸存在较大的季节变化(0.7～13.6 mg/(m2·h))，呼吸速率与倒木含水量、腐烂等级和温度显著相关(P0.05)。其中，基于倒木温度变化的指数拟合方程解释了超过67%的呼吸变化。不同腐烂等级倒木Q10值变幅为2.41～2.95，Q10计算值与选用的温度区间有关。林内倒木呼吸总量为(26.9±5.1) g/(m2·a)，约占林地CO2排放总量的3%、年净交换量的15%。 

Respiration of fallen trees of Pinus koraiensis and Tilia amurensis in Changbaishan Mountains,northeastern China

Respiration of fallen trees of Pinus koraiensis and Tilia amurensis，and their relationship with the major controlling factors were studied using the closed static chamber—gas chromatograph technique. On a yearly time scale，respiration rate (Rc) varied over two orders of magnitude (0.7-13.6 mg/(m²·hour))，and was significantly correlated with wood water content，decaying status and temperature (P<0.05). The temperature-dependent empirical exponential models for each decaying level explained more than 67% of the observed variations of Rc. The temperature coefficients (Q₁₀) ranged from 2.41 to 2.95 for different decaying levels，but also varied across the different temperature ranges. More decayed wood had higher moisture，lower density and higher respiration rate than the less decayed wood. Based on average fallen tree density and air temperature，the annual carbon loss rate due to respiration was estimated to be (26.9±5.1) g/(m²·a)(P=0.05), which accounted for about 3% of total carbon loss from forest floor and 15% of net ecosystem exchange for broadleaved Korean pine forest in Chan gbaishan Mountains.