坡度和季节变化对鸡公山栓皮栎林土壤呼吸速率的影响  

Effect of Different Slope and Season on Soil Respiratory Rate in Quercus variabilis Forest in Jigongshan National Nature Reserve

作　　者：郝艺晴 田慧敏 胡晓杰 刘彦春[1] 琚煜熙 张旺[3] HAO Yi-qing;TIAN Hui-min;HU Xiao-jie;LIU Yan-chun;JU Yu-xi;ZHANG Wang(School of Life Sciences,Henan University,Kaifeng 475004,China;Jigongshan National Natural Reserve Administration,Xinyang 464133,China;Xinyang Nanwan Forest Farm of Henan,Xinyang 464031,China)

机构地区：[1]河南大学生命科学学院,河南开封475004 [2]信阳市鸡公山国家级自然保护区管理局,河南信阳464133 [3]河南省信阳市南湾实验林场,河南信阳464031

出　　处：《浙江林业科技》2021年第6期9-14,共6页Journal of Zhejiang Forestry Science and Technology

基　　金：国家自然科学基金(31971454);河南省高等学校青年骨干教师培养计划(2020);河南大学校级教改项目(2019)。

摘　　要：坡度通过改变土壤微环境而影响土壤碳排放,探讨坡度变异下森林土壤碳排放规律对于全球森林土壤碳排放估算具有重要意义。本研究以鸡公山国家级自然保护区内栓皮栎Quercus variabilis落叶阔叶林为研究对象,通过测定不同坡度(5°、15°及30°)栓皮栎林的土壤呼吸速率及土壤理化性质,分析了不同坡度和季节变化对土壤呼吸速率的影响。结果显示,栓皮栎林的土壤湿度随坡度增加而显著下降(P <0.05),土壤呼吸速率的年平均值随坡度上升而显著下降,坡度为5°样地的土壤呼吸速率分别比坡度为15°和30°样地的呼吸速率高26.1%和39.0%。土壤温度、湿度与呼吸速率均表现出显著的季节变化。此外,环境因子对土壤呼吸速率的调节作用因坡度而异。在坡度为5°和15°样地内,土壤呼吸速率变异与土壤总氮及有机碳含量关系密切,而土壤温度是坡度30°样地内调节土壤呼吸速率变异的主要因子。In 2017, 30 sample plots were established in Quercus variabilis forest Jigongshan National Nature Reserve at slope of° 5°, 15° 30° for determination of respiratory rate and physio-chemical properties. The result demonstrated that soil respiratory rate in sample plots at 5° was 26.1%and 39.0% higher than that at 15° and 30°. Soil temperature, moisture, and respiratory rate was influenced by different season. Soil respiratory rate had close relation with soil total N and organic carbon content in sample plots at 5° and 15°, while at 30°, soil temperature showed greater contribution to the variation of soil respiratory rate.

关 键 词：坡度 季节 土壤呼吸速率 有机碳 栓皮栎林 鸡公山国家级自然保护区 

分 类 号：S714[农业科学—林学]