CAJ | 학술논문

为研究大气氮沉降对森林生态系统碳循环的影响，从2012年5月起，选择典型的苏北杨树（ Populus deltoides cv．‘I-35’）人工林为实验地，采用随机区组设计不同氮添加处理，进行野外氮添加定位试验，分析氮添加对不同林龄杨树人工林土壤活性有机碳的影响。结果表明：氮添加提高了土壤微生物生物量碳、可溶性有机碳的含量；土壤微生物生物量碳和可溶性有机碳含量有显著的季节变化，总体表现为夏秋季较高，冬春季较低。相关分析表明，微生物生物量碳含量与土壤温度呈极显著正相关（p＜0．01），可溶性有机碳含量与土壤温度相关性不显著（ p＞0．05）。研究表明，苏北杨树人工林土壤活性有机碳含量的季节变化主要受到土壤温度影响，同时其对氮添加呈正响应。
위연구대기담침강대삼림생태계통탄순배적영향，종2012년5월기，선택전형적소북양수（ Populus deltoides cv．‘I-35’）인공림위실험지，채용수궤구조설계불동담첨가처리，진행야외담첨가정위시험，분석담첨가대불동림령양수인공림토양활성유궤탄적영향。결과표명：담첨가제고료토양미생물생물량탄、가용성유궤탄적함량；토양미생물생물량탄화가용성유궤탄함량유현저적계절변화，총체표현위하추계교고，동춘계교저。상관분석표명，미생물생물량탄함량여토양온도정겁현저정상관（p＜0．01），가용성유궤탄함량여토양온도상관성불현저（ p＞0．05）。연구표명，소북양수인공림토양활성유궤탄함량적계절변화주요수도토양온도영향，동시기대담첨가정정향응。
In order to understand the effects of atmospheric nitrogen deposition on the carbon cycle of forest ecosystem, a field experiment of nitrogen addition at Dongtai forest farm in Jiangsu province was conducted in May 2012. The results showed that the nitrogen addition increased the contents of soil microbial biomass carbon ( MBC) and dissolved organic carbon (DOC).The soil MBC and DOC exhibited obvious seasonal patterns. Overall,the contents of soil MBC and DOC were higher in summer and autumn,but lower in winter and spring. The MBC had a significantly positive correlation with soil temperature (p<0.01).The DOC did not correlated with soil temperature (p>0.05).The results implicated that the seasonal variations of soil labile organic in poplar plantations were affected by soil temperature. In addition,the soil liable organic carbon respond positively to nitrogen addition.