生态学报2017，Vol.37Issue(23)：7994-8004,11.DOI:10.5846/stxb201610272195
不同温度条件下亚热带森林土壤碳矿化对氮磷添加的响应
Effects of nitrogen and phosphorus addition under different temperatures on the soil carbon mineralization in a Cunninghamia lanceolata plantation in the subtropics
摘要
Abstract
Increase in the soil nitrogen (N) availability under increasing N deposition is an important ecological processthat most terrestrial ecosystems experience.Increasing N deposition could affect soil respiration and consequently,affect the soil carbon (C) and N cycling.In this study,an N deposition simulation experiment was carried out in the Cunninghamia lanceolata forest in Shixi,Taihe County,Jiangxi Province,China.Soil carbon emissions were analyzed,using an alkali absorption method,under four treatments (no N and Phosphorus (P) addition (CK),N1 addition,N2 addition,and P addition) at four different temperatures (5℃,15℃,25℃,and 35℃).Soil respiration was inhibited by N deposition.As the temperature increased,soil respiration increased substantially (P ＜ 0.05).Different treatments had different effects on soil carbon emissions.The change regulation of CO2 accumulation emission and high N change regulation were similar for P addition under different temperature conditions.At 5℃,N addition inhibited soil carbon mineralization and this effect was stronger with increasing N concentration,whereas P addition promoted the soil carbon emission with increasing N concentration.However,at 15℃ and 35℃,N and P addition had an inhibitory effect on the soil carbon emission.At higher temperatures (25℃ and 35℃),total soil carbon significantly affected the CO2 accumulation;however,at lower temperatures (5℃ and 15℃) total soil carbon had the opposite effect on CO2 accumulation.At 5℃,soil water content in different treatments had a significant effect on soil carbon emission,whereas the other three temperatures (15℃,25℃,and 35℃) had no significant effect.At 25℃,soil carbon emission was significantly affected by soil DOC (P ＜ 0.05),whereas no effect was observed at the other three soil temperatures (5℃,15℃,and 35℃).At 25℃,soil DON had no significant effect on soil carbon accumulation emission.At 5℃,soil water content in different treatments had a significant effect on soil carbon emission but no significant effect at the other three temperatures (15℃,25℃,and 35℃).The Q10value under N and P addition was lower than that under the control condition (no N and P addition) and the Q10 value decreased with increasing N concentration.However,the difference in N deposition had no significant effect on the Q10 values.The potential carbon emission from soil respiration was simulated by the single reservoir model,Cm =Co(1-exp-kt).The results indicated that the four treatments had a significant effect on potential soil carbon emission at 5℃,15℃,and 35℃,but no significant effect at 25℃.关键词
氮沉降/杉木/碳矿化/温度Key words
N deposition/Cunninghamia lanceolata plantation/carbon mineralization/temperature引用本文复制引用
刘玉槐,严员英,张艳杰,严月,赵玉皓,徐燕,陈伏生,葛体达,鲁顺保..不同温度条件下亚热带森林土壤碳矿化对氮磷添加的响应[J].生态学报,2017,37(23):7994-8004,11.基金项目
国家自然科学基金(31360136,31560168,31660072) （31360136,31560168,31660072）
江西省自然基金(20151BAB204007,20161BAB204175) （20151BAB204007,20161BAB204175）
