中文摘要：

2007年6月至2009年10月，采用静态箱／气相色谱法测定了不同采伐干扰（皆伐后农作、皆伐后造林、50％强度采伐、25％强度采伐和对照）条件下，东北地区典型次生林的土壤CH。通量．结果表明：研究样地的土壤均为CH。的吸收汇．采伐干扰降低了土壤的CH。吸收能力，不同处理样地土壤的CH。吸收通量大小依次为：对照（一85．03μgCH。·m-2·h-1）〉50％强度采伐（-80．31μgCH4·m-2·h-1）〉25％强度采伐（-70．97μgCH4·m-2·h。）〉皆伐后农作（-65．57μgCH。·m-2·h-1）〉皆伐后造林（-62．02μgCH。·m-1 h。）．各处理样地土壤CH。吸收通量的季节动态相似，均表现为生长季吸收值较高，冬季较低．采伐干扰后各处理的土壤温度、土壤湿度、土壤硝态氮和铵态氮含量均增加，而土壤CH。吸收通量与土壤温度呈显著二次相关，与土壤含水量呈线性负相关．次生林采伐后土壤含水量、土壤铵态氮和硝态氮含量的增加是土壤CH。吸收通量降低的重要控制因子．

英文摘要：

From June, 2007 to October, 2009, a measurement with static chamber / gas chromato- graph techniques was conducted on the soil CH4 flux in a typical secondary hardwood forest in North- east China under the effects of different harvest disturbances, i. e. , uncut （control）, clear cutting （including both farming and reforestation after clear cutting）, 50% stand volume removed, and 25% stand volume removed. In all of the four treatments, the soil was the sink of atmospheric CH4, but cutting decreased the soil CH4 uptake flux, with the order of uncut （ -85.03 pLg CH4 ~ m-2 ~ h-1 ） 〉 50% stand volume removed （-80. 31 p,g CH4 ~ m-2 ~ h-1） 〉 25% stand volume removed （ -70.97 Ixg CH4 ~ m-2h-1 ） 〉 farming after clear cutting （ -65.57 pLg CH4 ~ m-2 ~ h-1 ） 〉 refores- tation after clear cutting （ -62.02 p.g CH4 ~ m-2 ~ h-1 ）. During the study period, the seasonal pat- terns of the soil CH4 uptake flux in all treatments were similar, with a higher value in growth season and a lower one in winter. After the harvest disturbance, the soil temperature, humidity, and NO3--N, and NH4＋-N contents were all increased, and the soil CH4 flux had a significant quadratic correlation with soil temperature, and a negative linear correlation with soil moisture content. It was suggested that the increase of the soil moisture, NO3--N, and NH4 ~-N contents after the forest har- vest was the main cause of the decrease of the soil CH4 uptake flux.