鼎湖山针阔叶混交林凋落物CO<sub>2</sub>释放对模拟酸雨的响应

梁国华<sup>1</sup>; 张德强<sup>2</sup>; 卢雨宏<sup>3</sup>; 冯 霞<sup>3</sup>; 罗国良<sup>3</sup>; 刘展宏<sup>3</sup>; 赵则海<sup>1*</sup>

引用本文:	梁国华, 张德强, 卢雨宏, 冯霞, 罗国良, 刘展宏, 赵则海.鼎湖山针阔叶混交林凋落物CO₂释放对模拟酸雨的响应[J].广西植物,2019,39(3):394-402.[点击复制]
	LIANG Guohua, ZHANG Deqiang, LU Yuhong, FENG Xia, LUO Guoliang, LIU Zhanhong, ZHAO Zehai.Responses of litter CO₂emission to simulated acid rain in a mixed conifer and broad-leaved forest of Dinghushan Nature Reserve[J].Guihaia,2019,39(3):394-402.[点击复制]

【打印本页】【下载PDF全文】【查看/发表评论】【下载PDF阅读器】【关闭】

←前一篇|后一篇→

过刊浏览高级检索

本文已被：浏览 7142次下载 2222次	码上扫一扫！
分享到：微信更多字体:加大+\|默认\|缩小-
鼎湖山针阔叶混交林凋落物CO₂释放对模拟酸雨的响应
梁国华¹, 张德强², 卢雨宏³, 冯霞³, 罗国良³, 刘展宏³, 赵则海^1*
1. 肇庆学院, 广东肇庆 526061;2. 中国科学院华南植物园, 广州 510650;3. 广东环境保护工程职业学院, 广东佛山 528216

摘要:

该研究2011年1月开始在鼎湖山针阔叶混交林(混交林)进行模拟酸雨实验,设置4个不同处理水平,即对照(CK)(pH为4.5左右的天然湖水)、T1(pH=4.0)、T2(pH=3.25)和T3(pH=2.5)。2013年1—12月对不同酸雨强度处理下的森林凋落物CO₂释放速率进行为期 1 a的连续观测,探讨酸雨对混交林凋落物C排放的影响。结果表明:凋落物CO₂释放通量在对照样方为(1 507.41±155.19)g CO₂·m^-2·a^-1,其中湿季和旱季分别占年通量的68.7%和31.3%。模拟酸雨抑制了森林凋落物CO₂释放,与CK相比,T2和T3处理下的CO₂释放通量分别显著降低15.4%和42.7%(P<0.05); 且这种抑制作用具有季节差异性,处理间的显著差异只出现在湿季。凋落物CO₂释放速率与土壤温度和土壤湿度分别呈显著指数相关和显著直线相关,同时,酸雨处理降低了凋落物CO₂释放的温度敏感性。混交林凋落物CO₂释放在模拟酸雨下的抑制效应与土壤累积酸化而导致的土壤微生物活性变化有关,表现为模拟酸雨作用下土壤pH值和微生物量碳显著下降。上述结果说明酸雨是影响混交林土壤碳循环的重要因子之一。

关键词: 模拟酸雨, 凋落物CO₂释放, 针阔叶混交林, 鼎湖山自然保护区

DOI：10.11931/guihaia.gxzw201803001

分类号:Q948

文章编号:1000-3142(2019)03-0394-09

基金项目:国家自然科学基金(31500353); 广东省科技计划项目(2014A020216031); 广东大学生科技创新培育专项项目(粤财政 [2017]83号)[Supported by the National Natural Science Foundation of China(NSFC 31500353); Science and Technology Planning Program of Guangdong Province, China(2014A020216031); Special Fund for Scientific and Technological Innovation Cultivation of College Students in Guangdong Province( [2017]83)]。

Responses of litter CO₂emission to simulated acid rain in a mixed conifer and broad-leaved forest of Dinghushan Nature Reserve

LIANG Guohua¹, ZHANG Deqiang², LU Yuhong³, FENG Xia³, LUO Guoliang³, LIU Zhanhong³, ZHAO Zehai^1*

1. Zhaoqing University, Zhaoqing 526061, Guangdong, China;2. South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China;3. Guangdong Polytechnic of Environmental Protection Engineering, Foshan 528216, Guangdong, China 1. Zhaoqing University, Zhaoqing 526061, Guangdong, China; 2. South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China; 3. Guangdong Polytechnic of Environmental Protection Engineering, Foshan 528216, Guangdong, China

Abstract:

A field experiment of simulated acid rain(SAR)was conducted in a mixed conifer and broadleaf forest(MF)at Dinghushan Nature Reserve. SAR treatments included CK(the local lake water, pH 4.5), T1(pH 4.0), T2(pH 3.25), and T3(pH 2.5)with four replicates. SAR experiments were initiated in January 2011, and the litter CO₂ emission rate under SAR was measured twice a month over one year from January 2013 to December 2013. The results indicated that litter CO₂ emission followed a clear seasonal pattern in the forest during the study period, with significantly higher rates in the wet season and lower rates in the dry one(P<0.05). The mean annual litter CO₂ emission in the CK plots was(1 507.41±155.19)g CO₂·m^-2·a^-1, to which the wet season and the dry season contributed 68.7% and 31.3%, respectively. SAR significantly reduced litter CO₂ emission in the forest(P<0.05). Compared with CK, mean annual litter CO₂ emission was 15.4% and 42.7% lower in T2 and T3 treatments, respectively. SAR reducing litter CO₂ emission had seasonal differences, and these negative effects were evident in the wet season(P<0.05), but not in the dry one. In all treatments, litter CO₂ emission rate exhibited significantly positive exponential relationships with soil temperature and significantly positive linear relationships with soil moisture. In addition, the mean temperature sensitivity(Q₁₀)values showed a declining trend with the increasing level of SAR. The depression of litter CO₂ emission after SAR in the MF was related to the aggravation of soil acidification and the depression of microbial activity, as we found that soil pH value and soil microbial biomass C significantly decreased under SAR. In conclusion, our results supported an important role of acid rain in regulating soil carbon cycle.

Key words: simulated acid rain, litter CO₂ emission, mixed conifer and broad-leaved forest, Dinghushan Nature Reserve