摘要
全球变暖引起陆地生态系统和整个生物圈一系列生态问题,未来全球平均气温的持续增加将使这些问题进一步加剧。目前增温、氮沉降和森林更新方式对中亚热带土壤氮磷等养分的影响已有部分研究,但增温对亚热带森林的氮磷耦合作用的影响仍然未知。以中亚热带杉木(Cunninghamia lanceolate)幼苗为研究对象,设置埋设电缆以加热土壤增温实验(增温幅度(5±0.5)℃),研究短期增温对土壤含水量、微生物生物量氮(MBN)、微生物生物量磷(MBP)、土壤氮磷养分,以及氮(N)、磷(P)耦合作用的影响。结果表明:短期增温对全氮、全磷无显著影响;增温第1年显著提高了有效氮、铵态氮(NH_4^+)和有效磷的含量,显著降低了MBN含量。增温第2年,土壤中有效磷、NH_4^+和MBP含量显著下降;短期增温虽然对土壤全N/P,有效N/P的影响不显著,但是增温使铵态氮/硝态亚硝态氮(NH_4^+/(NO_3^-+NO_2^-))显著降低;此外,增温显著降低了MBN/MBP,缓解了微生物对磷的限制。相关性分析表明,耦合作用不仅受N和P之间相互作用的影响,也受土壤温度、水分含量等其他因素的影响。研究表明,短期增温并未对中亚热带杉木人工幼林土壤氮磷耦合作用产生显著影响,但增温后降低了有效氮、有效磷的含量。因此,在未来全球变暖背景下,研究结果为中亚热带森林生态系统的的健康发展和科学管理提供重要的理论依据。
Global warming has caused a series of ecological issues in terrestrial ecosystems and the biosphere as a whole; these issues will further aggravate because global average temperatures will continue to increase. Currently, the effects of warming, nitrogen deposition, and forest regeneration on soil nutrients such as N and P have been studied; however, the effects of warming on the coupling between soil N and P in subtropical forests remain unknown. In this study, the influence of short-term warming on the coupling mechanism between soil N and P in Chinese fir （ Cunninghamia lanceolata） seedlings in a mid-subtropical plantation was investigated. In the experiment, cables were buried in the soil to increase soil temperature （temperature range （5±0.5）℃ ）. The effects of short-term warming on soil water content, microbial biomass N （MBN）, microbial biomass P （MBP）, soil N and P, and N and P coupling were studied. The results showed that the effects of short-term warming on total N and total P were not significant. In the first year, temperature increase led to significant increase in effective N, ammonium N, and available P content, and a significant reduction in MBN content. In the second year, with the increase of temperature, the contents of available P, NH4, and MBP decreased significantly. However, the increase in NH4/（ NO3 ＋NO2） content significantly reduced the MBN/MBP content, and alleviated the limitation of P on microorganisms, but the effects of temperature on total N/P and available N/P were not significant. Correlation analysis showed that the coupling effect was not only influenced by the interaction between N and P, but was also influenced by soil temperature, soil water content, and other factors. These results indicated that short-term warming did not significantly affect soil N-P coupling in the subtropical Chinese fir plantation; however, it increased available N and available P contents by promoting plant growth. Thus, our findings will provide an important theoretical
作者
赵盼盼
高金涛
郑蔚
贝昭贤
刘志江
熊德成
叶旺敏
曾晓敏
袁萍
杨舟然
陈岳民
杨玉盛
ZHAO Panpan;GAO Jingtao;ZHENG Wei;BEI Zhaoxian;LIU Zhijiang;XIONG Decheng;YE Wangmin;ZENG Xiaomin;YUAN Pingl,;YANG Zhouran;CHEN Yuehmin;YANG Yusheng(School of Geographical Sciences, Fujian Normal University, Fuzhou 350007, China;Cultivation Base of State Key Laboratory of Humid Subtropical Mountain Ecology, Fuzhou 350007, China)
出处
《生态学报》
CAS
CSCD
北大核心
2018年第8期2829-2837,共9页
Acta Ecologica Sinica
基金
国家自然科学基金项目(31670620)
海峡联合基金项目(U1505233)
"973"计划项目(2014CB954003)
关键词
增温
土壤氮
土壤磷
耦合作用
中亚热带
warming
soil nitrogen
soil phosphorus
coupling mechanism
mid-subtropical
