文献类型：期刊文献

中文题名：模拟氮沉降对长江滩地杨树林土壤呼吸温度敏感性的影响

英文题名：Effects of simulated nitrogen deposition on temperature sensitivity of soil respiration components in Populus L. plantations in a riparian zone of the Yangtze River

作者：周政达[1,3] 张蕊[1] 高升华[2] 张旭东[2] 付晓[1] 唐明方[1] 吴钢[1]

第一作者：周政达

机构：[1]中国科学院生态环境研究中心,城市与区域生态国家重点实验室,北京100085;[2]中国林业科学研究院林业研究所,北京100091;[3]中国科学院大学,北京100049

年份：2015

卷号：35

期号：21

起止页码：6947-6956

中文期刊名：生态学报

外文期刊名：Acta Ecologica Sinica

收录：CSTPCD;;Scopus;北大核心:【北大核心2014】；CSCD:【CSCD2015_2016】；

基金：国家“十二五”农村领域科技计划子课题(2011BAD38B0405)

语种：中文

中文关键词：长江滩地;杨树人工林;土壤呼吸温度敏感性;氮沉降

外文关键词：riparian zone of the Yangtze River; Populus plantation; temperature sensitivity of soil respiration;Nitrogen deposition

分类号：S154.1

摘要：研究氮沉降量增加对土壤呼吸温度敏感性的影响,对于研究土壤呼吸在气候变化中的作用有重要意义。以长江中下游滩地杨树人工林为对象,通过定位模拟氮沉降实验的方法,研究了滩地杨树人工林生态系统土壤呼吸的变化特征和土壤呼吸各组分的温度敏感性对几种氮沉降量浓度的短期响应。结果表明:(1)各处理土壤总呼吸、土壤微生物呼吸、根系呼吸与各层次土壤温度均呈显著正相关关系,和5cm层土壤温度相关性最大。5cm层土壤温度可以解释土壤总呼吸、土壤微生物呼吸和根系呼吸季节变化的比例分别为50.5%—71.0%、51.5%—73.9%、35.7%—63.2%;(2)对照组(CK,0g N m-2a-1)土壤总呼吸、土壤微生物呼吸与根呼吸的Q10值分别为2.54、2.72和1.94;(3)在各氮添加水平中,中氮水平(MN,10g N m-2a-1)促进了土壤总呼吸、土壤微生物呼吸和植物根呼吸的温度敏感性。高氮水平(HN,20g N m-2a-1)都降低了土壤总呼吸、土壤微生物呼吸和植物根呼吸的温度敏感性,低氮水平(LN,5g N m-2a-1)降低了土壤总呼吸和土壤微生物呼吸的温度敏感性,促进了根呼吸的敏感性。
By the end of the 20th century, China has become one of the world＇s top three Continuous increase in production and deposition of nitrogen has a significant impact on the Therefore, the response of the carbon cycle in a forest ecosystem to nitrogen deposition scientific issue. Soil respiration is an important component of the carbon cycle in terrestrial regions of nitrogen deposition. carbon cycle in the ecosystem. has become a very important ecosystems, and it is also the only path of carbon output into the atmosphere from the soil and an important source of atmospheric CO2. response of temperature sensitivity of soil respiration to nitrogen deposition is important for understanding A study the role on the of soil respiration in the mitigation of climate change., In this paper, based on the simulations of different quantities of nitrogen depositions, our research was focused on the changes in soil respiration and on the short-term responses in temperature sensitivity of each component of soil respiration to several gradients of nitrogen deposition in Populus L. plantations in a riparian zone of the Yangtze River. We found that ： （ 1 ） Soil respiration and its components exhibited significant seasonal variations, in the form of bimodal curves, because of the seasonal flooding. The rate of soil respiration showed a downward trend because of the rise in groundwater level in June and July, which reached the maximum in August and the minimum in December and January. The correlation between soil temperature at different depths （5 cm, 10 cm, and 20 cm） and total soil respiration was significantly positive. The correlation between root respiration and soil temperature at different depths was lower than that between total soil respiration and soil microbial respiration. The correlation was the highest between the soil temperature at a depth of 5 cm and total soil temperature. The soil temperature at a depth of 5 cm explained 50.5%-- 71.0%, 51.5%--73.9%, and 35.7%--63.2% of total soil temperature, soil microbial respiration, and root respiration, respectively. （2） The Q,0 values of total soil respiration, soil microbial respiration, and root respiration in the control group （CK,0gN m-2 a-A） were 2.54, 2.72, and 1.94, respectively. （3） The treatment with the medium levels of nitrogen （MN, 10gNm^-2a^-1 ） enhanced the temperature sensitivity of total soil respiration, soil microbial respiration, and root respiration, whereas the treatment with high levels of nitrogen （HN,20gN m^-2 a^-1） reduced their temperature sensitivity. The treatment with low levels of nitrogen （ LN, 5gN m^-2a^-1 ） also reduced the temperature sensitivity of total soil respiration and soil microbial respiration but enhanced root respiration.