氮沉降对长白山森林土壤团聚体内碳、氮含量的影响

doi:10.13287/j.1001-9332.201905.025

应用生态学报 ›› 2019, Vol. 30 ›› Issue (5): 1543-1552.doi: 10.13287/j.1001-9332.201905.025

氮沉降对长白山森林土壤团聚体内碳、氮含量的影响

周学雅¹, 陈志杰^2,3,4, 耿世聪⁴, 张军辉⁴, 韩士杰^3*

¹河南大学环境与规划学院, 教育部黄河中下游数字地理重点实验室, 河南开封 475001;
²厦门大学嘉庚学院, 福建漳州 363105;
³河南大学生命科学学院, 河南开封 475001;
⁴中国科学院沈阳应用生态研究所森林生态与管理重点实验室, 沈阳 110016

收稿日期:2019-01-21 修回日期:2019-01-21 出版日期:2019-05-15 发布日期:2019-05-15
通讯作者: E-mail: hansj@iae.ac.cn
作者简介:周学雅,女,1988年生,博士.主要从事全球变化下土壤碳、氮和水文循环研究.E-mail: zhouxueya123@sina.com
基金资助:
福建省教育厅科技项目(JAT170832)、国家自然科学基金项目(41330530,41430639,41575153,41807330,31800413)和中原学者项目(182101510005)

Effects of nitrogen deposition on carbon and nitrogen contents in soil aggregates in temperate forests of Changbai Mountain, Northeast China.

ZHOU Xue-ya¹, CHEN Zhi-jie^2,3,4, GENG Shi-cong⁴, ZHANG Jun-hui⁴, HAN Shi-jie^3*

¹Ministry of Education Key Laboratory of Geospatial Technology for the Middle and Lower Yellow River Regions, College of Environment and Planning, Henan University, Kaifeng 475001, Henan, China;
²Tan Kah Kee College, Xiamen University, Zhangzhou 363105, Fujian, China;
³College of Life Science, Henan University, Kaifeng 475001, Henan, China;
⁴Key Laboratory of Forest Ecology and Management, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China

Received:2019-01-21 Revised:2019-01-21 Online:2019-05-15 Published:2019-05-15
Supported by:
This work was supported by the Science-technology Project of Education Department of Fujian Province, China (JAT170832), the National Natural Science Foundation of China (41330530, 41430639, 41575153, 41807330, 31800413) and the Zhongyuan Scholarship Program, China (182101510005).

摘要/Abstract

摘要： 氮沉降是影响陆地生态系统碳、氮循环的最重要因素之一.为了解土壤团聚体碳、氮组分对氮沉降的响应,本研究在长白山选取次生杨桦林(YHL)与原始阔叶红松林(HSL)两种林型进行为期6年的氮添加试验,采集土壤样品并分析氮沉降对不同粒径土壤团聚体中可溶性有机碳、氮(DOC和DON)、微生物生物量碳、氮(MBC和MBN)、颗粒有机碳、氮(POC和PON)的影响.结果表明: 除POC和PON外,两林分土壤团聚体碳、氮组分含量均随团聚体粒径的减小而增加;氮添加处理显著降低了HSL土壤团聚体中POC和PON含量,降幅分别达20.7%和22.6%,显著增加了DOC含量,增幅达11.6%;氮添加处理对YHL土壤团聚体的碳、氮组分均无显著影响,其中,对DOC和MBC的影响接近于显著(0.05＜P＜0.1).皮尔森相关分析结果表明,土壤团聚体中总碳或总氮与碳、氮活性组分之间有良好的相关性,其中,HSL土壤的POC与DOC之间呈极显著负相关(r=-0.503),DOC又与MBC呈显著正相关关系(r=0.462).氮添加处理降低阔叶红松林土壤团聚体中POC和PON含量、增加DOC含量的主要原因是其促进了微生物对POM的分解,进而导致DOC的释放.阔叶红松林土壤碳、氮库对氮沉降的响应比次生杨桦林更加敏感.

Abstract: Nitrogen deposition is one of the most important factors affecting carbon (C) and nitrogen (N) cycling in terrestrial ecosystem. A six-year N addition experiment was carried out to explore how N deposition affected C and N fractions in soil aggregates in the secondary aspen forest (YHL) and primary Korean pine broad-leaved forest (HSL). We investigagted the effects of N addition on dissolved organic carbon and nitrogen (DOC and DON), microbial biomass carbon and nitrogen (MBC and MBN), particulate organic carbon and nitrogen (POC and PON) in soil aggregates with different particle sizes. The results showed that the contents of carbon and nitrogen fractions generally increased with the decrease of particle sizes of soil aggregates except for POC and PON. In soil aggregates of HSL, POC and PON significantly decreased by 20.7% and 22.6% in N treatment, respectively, but DOC increased by 11.6%. In YHL, N addition treatment had no signi-ficant effect on C and N fractions in soil aggregates. Total carbon or nitrogen correlated well with the active C and N fractions in soil aggregates, with a great significant negative correlation between POC and DOC in HSL (r=-0.503) and a significant positive correlation between DOC and MBC (r=0.462). In HSL, the negative effect of N treatment on POC and PON and the positive effect on DOC was mainly attributed to the accelerated decomposition of POM by stimulating microbial activity. Soil C and N pools in HSL were more vulnerable to N deposition than that in YHL.

周学雅, 陈志杰, 耿世聪, 张军辉, 韩士杰. 氮沉降对长白山森林土壤团聚体内碳、氮含量的影响[J]. 应用生态学报, 2019, 30(5): 1543-1552.

ZHOU Xue-ya, CHEN Zhi-jie, GENG Shi-cong, ZHANG Jun-hui, HAN Shi-jie. Effects of nitrogen deposition on carbon and nitrogen contents in soil aggregates in temperate forests of Changbai Mountain, Northeast China.[J]. Chinese Journal of Applied Ecology, 2019, 30(5): 1543-1552.

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氮沉降对长白山森林土壤团聚体内碳、氮含量的影响

Effects of nitrogen deposition on carbon and nitrogen contents in soil aggregates in temperate forests of Changbai Mountain, Northeast China.

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