水分对武夷山草甸土壤有机碳激发效应的影响

doi:10.13287/j.1001-9332.202104.022

应用生态学报 ›› 2021, Vol. 32 ›› Issue (4): 1250-1258.doi: 10.13287/j.1001-9332.202104.022

水分对武夷山草甸土壤有机碳激发效应的影响

李佳玉^1,2, 吕茂奎^1,3*, 李晓杰^1,2, 姜永孟^1,2, 谢锦升^1,2

¹福建师范大学地理科学学院, 福州 350007;
²福建师范大学湿润亚热带生态地理过程教育部重点实验室, 福州 350007;
³福建师范大学生态学博士后流动站, 福州 350007

收稿日期:2020-08-18 接受日期:2021-01-18 发布日期:2021-10-25
通讯作者: *E-mail: maokui.lyu@fjnu.edu.cn
作者简介:李佳玉, 女, 1997年生, 硕士研究生。主要从事森林生态研究。E-mail: 843277551@qq.com
基金资助:
国家自然科学基金项目(31870604,U1405231)和福建省科技厅对外合作项目(2019I0010)资助

Effects of soil moisture on priming effect of soil organic carbon in meadow in Wuyi Mountain, China.

LI Jia-yu^1,2, LYU Mao-kui^1,3*, LI Xiao-jie^1,2, JIANG Yong-meng^1,2, XIE Jin-sheng^1,2

¹College of Geographical Science, Fujian Normal University, Fuzhou 350007, China;
²Key Laboratory for Humid Subtropical Eco-geographical Processes of the Ministry of Education, Fujian Normal University, Fuzhou 350007, China;
³Ecology Postdoctoral Research Station, Fujian Normal University, Fuzhou 350007, China

Received:2020-08-18 Accepted:2021-01-18 Published:2021-10-25
Contact: *E-mail: maokui.lyu@fjnu.edu.cn
Supported by:
National Natural Science Foundation of China (31870604, U1405231) and International Cooperation Project of Fujian, China (2019I0010).

摘要/Abstract

摘要： 水分是影响土壤有机碳激发效应的重要因子,但水分如何影响山地草甸土有机碳激发效应尚不清楚。本试验以武夷山高海拔(2130 m)山地草甸土为研究对象,通过室内添加¹³C标记的葡萄糖结合控制土壤水分(30%FWC和60%FWC,FWC为田间持水量),进行为期126 d的室内培养试验,定期测定CO₂浓度和¹³C-CO₂丰度值,研究不同水分条件下土壤有机碳矿化特征和激发效应的差异及其影响因素。结果表明: 山地草甸土碳矿化随着水分增加而增加。不同土壤水分山地草甸土激发效应随培养时间延长呈现逐渐降低的趋势,低含水量土壤激发效应显著大于高含水量土壤,培养结束时低含水量土壤累积激发碳量比高含水量土壤高61.4%。与低含水量土壤相比,高含水量土壤由葡萄糖矿化产生的CO₂量较多,且低含水量土壤的累积激发碳量与葡萄糖矿化量的比值显著大于高含水量土壤,说明高含水量土壤微生物更多地矿化外源添加的葡萄糖,且激发效率较低,最终高含水量土壤激发效应小于低含水量土壤。相关分析表明,土壤激发效应与土壤微生物生物量碳(MBC)、微生物生物量碳与氮比值(MBC/MBN)和NH₄⁺-N变化量呈显著正相关,说明低含水量条件会通过改变山地草甸土壤微生物数量和组成,进而提高土壤微生物对氮的“挖掘”,最终增加激发效应。因此,全球气候变化背景下若山地草甸土壤水分降低可能会增加通过激发效应引起的碳损失。

关键词: 激发效应, 山地草甸土, 土壤有机碳, 矿化作用, 土壤水分

Abstract: Moisture is an important factor affecting the priming effect of soil organic carbon (SOC). However, empirical evidence for its effect in mountain meadows soil is lacking. We conducted a 126-day laboratory incubation experiment with the high altitude (2130 m) mountain meadow soil in Wuyi Mountain, by adding ¹³C-labelled glucose combined with controlling soil moisture (30% and 60% of field water capacity, FWC). The CO₂ concentration and ¹³C-CO₂ abundance were measured regularly to examine the differences of SOC mineralization and priming effects under different water conditions and the driving factors. Our results showed that SOC mineralization rate increased with increasing soil water content. The priming effect of meadow soil with different soil moisture showed a decreasing trend with the increases of incubation time. The priming effect in soils with low FWC soil was significantly greater than that with high FWC. At the end of incubation, the cumulative priming effect of low FWC soil was 61.4% higher than that of high FWC soil. Compared with low FWC soil, high FWC soil released more CO₂ from glucose, and the ratio of cumulative primed carbon to glucose mineralization under low FWC was significantly higher than that under high FWC soil, indicating that soil microorganisms under the high FWC condition might preferentially mineralize more glucose than SOC and consequently lower priming effect. Therefore, the priming effect under high FWC was smaller than that under low FWC. There was a significant positive relationship between priming effect and microbial biomass carbon, microbial biomass carbon/microbial biomass nitrogen, and NH₄⁺-N, indicating that soil microbial biomass and composition could be changed under low FWC condition. The improved microbial “nitrogen-mining” would increase priming effect. Consequently, the decline of soil moisture of mountain meadow induced by global climate change may increase the priming effect of carbon, with consequences on carbon loss.

Key words: priming effect, alpine meadow soil, soil organic carbon, mineralization, soil water content

李佳玉, 吕茂奎, 李晓杰, 姜永孟, 谢锦升. 水分对武夷山草甸土壤有机碳激发效应的影响[J]. 应用生态学报, 2021, 32(4): 1250-1258.

LI Jia-yu, LYU Mao-kui, LI Xiao-jie, JIANG Yong-meng, XIE Jin-sheng. Effects of soil moisture on priming effect of soil organic carbon in meadow in Wuyi Mountain, China.[J]. Chinese Journal of Applied Ecology, 2021, 32(4): 1250-1258.

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水分对武夷山草甸土壤有机碳激发效应的影响

Effects of soil moisture on priming effect of soil organic carbon in meadow in Wuyi Mountain, China.

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