生态环境学报2018，Vol.27Issue(5)：844-851,8.DOI:10.16258/j.cnki.1674-5906.2018.05.007
鼎湖山季风常绿阔叶林土壤C:N:P生态化学计量特征对长期模拟酸雨的响应
Responses of Soil C:N:P Stoichiometry to Long-term Simulated Acid Rain in A Monsoon Evergreen Broad-leaved Forest at Dinghushan Nature Reserve
摘要
Abstract
To study the effects of simulated acid rain (SAR) on forest soil C:N:P stoichiometry is of significance in understanding the responses of ecosystem biogeochemical cycling to elevated acid rain.In this study, a field experiment of SAR was conducted in a monsoon evergreen broad-leaved forest at Dinghushan Nature Reserve. Acid rain treatments included CK (the local lake water, pH 4.5), T1 (pH 4.0), T2 (pH 3.5), and T3 (pH 3.0) with three replicates. SAR experiments were initiated in June 2009. Responses of soil pH value, soil C, N, and P content,and soil C:N:P stoichiometry to SAR were studied from December 2009 to December 2017. The results showed that during the study period, mean values of soil pH value, soil C, N, P concentration of 0~10 cm soil layer in the CK plots were (3.89±0.01), (31.99±0.37), (2.25±0.05) and (0.23±0.01) g·kg-1, respectively. SAR significantly reduced soil pH value (0.22 lower in maximum, P<0.05), indicated that soil acidification was aggravated under SAR. The soil C concentration increased significantly (14.69% higher in maximum, P<0.05) and the soil P concentration tended to decrease (18.79% lower in maximum) under SAR. However, the soil N concentration did not change obviously under SAR. Mean values of C:N, C:P, and N:P of 0~10 cm soil layer in the CK plots were (14.24±0.23), (141.38±3.35) and (9.91±0.26), respectively. Due to the different responses of soil C, N, and P concentration to SAR, C:P and N:P increase significantly under SAR (41.31% and 27.16% higher in maximum, respectively, P<0.05). In addition, we found that these treatment effects had been strengthened over time with significant difference among treatments occurred only in the later period of the experiment. Furthermore, these effects were only evident in the 0-10cm soil layer (P<0.05), but not in the 10~20 cm soil layer. Our results indicated that long-term acid rain and soil acidification changed the coupling relationship among soil C, N, and P, aggravated the limiting effect of P on forest soil, and thus reduced the stability of the structure and function of lower subtropical forest ecosystem.关键词
模拟酸雨/土壤酸化/土壤C:N:P计量比/南亚热带森林/鼎湖山Key words
simulated acid rain/soil acidification/soil C:N:P stoichiometry/lower subtropical forest/Dinghushan Nature Reserve分类
农业科技引用本文复制引用
梁国华,张德强,卢雨宏,冯霞,罗国良,赵则海..鼎湖山季风常绿阔叶林土壤C:N:P生态化学计量特征对长期模拟酸雨的响应[J].生态环境学报,2018,27(5):844-851,8.基金项目
国家自然科学基金项目(31500353) （31500353）
广东省科技计划项目(2014A020216031) （2014A020216031）
广东大学生科技创新培育专项资金项目(粤财政[2017]83号) （粤财政[2017]83号）
