增温对湿润亚热带杉木幼林和成熟林土壤无机氮的影响

doi:10.13287/j.1001-9332.202009.001

应用生态学报 ›› 2020, Vol. 31 ›› Issue (9): 2849-2856.doi: 10.13287/j.1001-9332.202009.001

增温对湿润亚热带杉木幼林和成熟林土壤无机氮的影响

杨成邦^1,2, 张丽^1,2, 高艳丽^1,2, 吴娜^1,2, 陈仕东^1,2, 刘小飞^1,2, 杨智杰^1,2*

¹福建师范大学地理科学学院/湿润亚热带山地生态国家重点实验室培育基地, 福州 350007;
²福建三明森林生态系统与全球变化野外科学观测研究站, 福建三明 365000

收稿日期:2020-04-01 接受日期:2020-06-08 出版日期:2020-09-15 发布日期:2021-03-15
通讯作者: * E-mail: zhijieyang@fjnu.edu.cn
作者简介:杨成邦, 男, 1995年生, 硕士研究生。主要从事森林生态系统氮循环研究。E-mail: yangchengbang@foxmail.com
基金资助:
国家“973”计划项目(2014CB954003)资助

Effects of warming on soil inorganic nitrogen in the young and mature Cunninghamia lanceolata plantations in humid subtropical region, China

YANG Cheng-bang^1,2, ZHANG Li^1,2, GAO Yan-li^1,2, WU Na^1,2, CHEN Shi-dong^1,2, LIU Xiao-fei^1,2, YANG Zhi-jie^1,2*

¹College of Geographical Sciences, Fujian Normal University/Cultivation Base of State Key Laboratory of Humid Subtropical Mountain Ecology, Fuzhou 350007, China;
²Sanming Forest Ecosystem and Global Change Observation and Research Station of Fujian Province, Sanming 365000, Fujian, China

Received:2020-04-01 Accepted:2020-06-08 Online:2020-09-15 Published:2021-03-15
Contact: * E-mail: zhijieyang@fjnu.edu.cn
Supported by:
the National 973 Program Project (2014CB954003).

摘要/Abstract

摘要： 全球变暖可能加快或抑制森林土壤氮循环,进而影响森林生态系统生产力,而且这种影响随时间的持续而更加复杂。本研究以亚热带杉木幼林和成熟林土壤为对象,通过土壤电缆增温模拟未来气候变化情景,分析土壤无机氮含量对模拟增温的响应。结果表明: 经过持续3年的增温试验(4 ℃),亚热带地区增温显著降低了杉木幼林和成熟林土壤总无机氮和铵态氮含量。其中杉木幼林土壤的降幅更大,其0～10、10～20、20～40、40～60 cm土层土壤铵态氮含量的降幅分别为32.1%、37.1%、20.8%、19.9%。增温导致2种林分土壤可溶性有机氮减少和N₂O排放加快,土壤矿化基质输入减少和气态氮损失增大是土壤中现存无机氮含量减少的原因。杉木幼林土壤矿化基质降幅和气态氮排放升高幅度均比成熟林土壤大,杉木幼林土壤对增温更为敏感。3年的增温造成杉木幼林和成熟林土壤无机氮含量下降,可能对杉木人工林生产力产生不利的影响。

关键词: 增温, 铵态氮, 硝态氮, 亚热带, 杉木

Abstract: Soil nitrogen cycling in forests may be accelerated or inhibited by global warming, with consequences on forest productivity. Such an impact will be more complicated with extending period of warming. We examined the effects of warming on soil inorganic nitrogen content in the young and mature Cunninghamia lanceolata plantations. Warming was simulated by means of soil cable warming, simulating a future climate change scenario of 4 ℃ warming. The results showed that after three years warming, both total soil inorganic nitrogen and ammonium contents in the young and mature plantations were significantly reduced. The sharp decline occurred in the young plantation, with soil ammonium content in 0-10, 10-20, 20-40, 40-60 cm soil layers decreased by 32.1%, 37.1%, 20.8% and 19.9%, respectively. Dissolved organic nitrogen was reduced and N₂O emission was accelerated in the both plantations. The main reasons for the reduction of soil inorganic nitrogen concentration were lower input of organic nitrogen substrate and higher gaseous nitrogen loss. The decrease in soil organic nitrogen substrate and increase in gaseous nitrogen emissions in the young plantation were larger than those in the mature plantation, indicating that soils in the young plantation were more sensitive to increasing temperature. The 3-year warming decreased soil inorganic nitrogen contents in the two C. lanceolata plantations, which might negatively affect productivity of the C. lanceolata plantations in subtropic China.

Key words: warming, ammonium nitrogen, nitrate nitrogen, humid subtropical region, Cunninghamia lanceolata

杨成邦, 张丽, 高艳丽, 吴娜, 陈仕东, 刘小飞, 杨智杰. 增温对湿润亚热带杉木幼林和成熟林土壤无机氮的影响[J]. 应用生态学报, 2020, 31(9): 2849-2856.

YANG Cheng-bang, ZHANG Li, GAO Yan-li, WU Na, CHEN Shi-dong, LIU Xiao-fei, YANG Zhi-jie. Effects of warming on soil inorganic nitrogen in the young and mature Cunninghamia lanceolata plantations in humid subtropical region, China[J]. Chinese Journal of Applied Ecology, 2020, 31(9): 2849-2856.

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增温对湿润亚热带杉木幼林和成熟林土壤无机氮的影响

Effects of warming on soil inorganic nitrogen in the young and mature Cunninghamia lanceolata plantations in humid subtropical region, China

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