东北地区大秃顶子山土壤-微生物-胞外酶C:N:P 化学计量特征沿海拔梯度的变化

doi:10.17521/cjpe.2019.0141

植物生态学报 ›› 2019, Vol. 43 ›› Issue (11): 999-1009.DOI: 10.17521/cjpe.2019.0141

所属专题：生态化学计量；微生物生态学

东北地区大秃顶子山土壤-微生物-胞外酶C:N:P 化学计量特征沿海拔梯度的变化

殷爽,王传宽,金鹰,周正虎()

东北林业大学生态研究中心, 哈尔滨 150040; 东北林业大学森林生态系统可持续经营教育部重点实验室, 哈尔滨 150040

收稿日期:2019-06-10 接受日期:2019-09-16 出版日期:2019-11-20 发布日期:2020-03-26
通讯作者: 周正虎
基金资助:
国家自然科学基金(31901293);“十二五”科技支撑项目(2011BAD37B01);长江学者和创新团队发展计划项目(IRT_15R09);中国科学技术协会青年人才托举工程项目(2018QNRC001)

Changes in soil-microbe-exoenzyme C:N:P stoichiometry along an altitudinal gradient in Mt. Datudingzi, Northeast China

YIN Shuang,WANG Chuan-Kuan,JIN Ying,ZHOU Zheng-Hu()

Center for Ecological Research, Northeast Forestry University, Harbin 150040, China; and Key Laboratory of Sustainable Forest Ecosystem Management—Ministry of Education, Northeast Forestry University, Harbin 150040, China

Received:2019-06-10 Accepted:2019-09-16 Online:2019-11-20 Published:2020-03-26
Contact: ZHOU Zheng-Hu
Supported by:
Supported by the National Natural Science Foundation of China(31901293);the National Key Technology Research and Development Program of China(2011BAD37B01);the Program for Changjiang Scholars and Innovative Research Team of Ministry of Education of China(IRT_15R09);the Young Elite Scientists Sponsorship Program by China Association for Science and Technology(2018QNRC001)

摘要/Abstract

摘要：

海拔变化导致温度、水分、植被等条件的改变会显著影响土壤碳(C_soil)、氮(N_soil)、磷(P_soil)含量及其化学计量特征, 土壤微生物如何通过调整自身生物量和胞外酶化学计量特征进行适应仍不明确。为了研究海拔梯度变化对土壤微生物生物量和胞外酶活性的影响, 探索土壤-微生物-胞外酶C:N:P化学计量特征间的协变性, 该文以黑龙江省雪乡大秃顶子山800、1 100、1 600和1 700 m分布的典型生态系统(针阔混交林、针叶林、岳桦林和草地)为研究对象, 测定其C_soil、N_soil、P_soil含量, 微生物生物量C (C_mic)、N (N_mic)、P (P_mic)含量, 以及微生物获取C (β-1, 4-葡萄糖苷酶, BG), N (几丁质酶, NAG), P (酸性磷酸酶, AP)资源的相关胞外酶活性。结果表明: (1)海拔梯度变化对C_soil和C_mic含量没有显著影响; 不同海拔间土壤和微生物生物量N、P含量存在显著差异。(2) BG和NAG活性随着海拔的升高呈现显著降低趋势, 表明海拔升高导致的温度降低抑制了微生物的活性。(3)海拔对土壤C:N、微生物C:N:P以及胞外酶C:N:P均具有显著影响。胞外酶C:N:P随着微生物与土壤间C:N:P化学计量不平衡性(土壤C:N:P与微生物C:N:P的比值)的增加而逐渐降低。微生物可以通过调整自身生物量以及胞外酶C:N:P适应土壤化学计量特征的变异, 该结果支持了微生物的资源分配理论。

关键词: 化学计量, 微生物活性, C:N:P, 海拔, 胞外酶

Abstract:

Aims Altitude-induced changes in temperature, moisture, vegetation types and other conditions would significantly affect soil carbon (C_soil), nitrogen (N_soil), phosphorus (P_soil) concentrations and their stoichiometry. How soil microorganisms adapt to the variability of soil resource stoichiometry by regulating their biomass and extracellular enzymatic stoichiometry remains uncertain. The objective of this study was to quantify the altitudinal trends of soil-microbe-exoenzyme C:N:P stoichiometry and to explore the correlations among soil-microbe- exoenzyme stoichiometry.Methods In the present study, we investigated the C_soil, N_soil, P_soilconcentrations, microbial biomass C (C_mic), N (N_mic), P (P_mic) concentrations, and the activities of C (β-1,4-glucosidase, BG), N (N-acetyl-β-glucosaminidase, NAG), and P (acid phosphatase) acquiring extracellular enzymes for microorganisms in four ecosystems along an altitudinal gradient on Mt. Datudingzi, Northeast China. These four ecosystems are a mixed broadleaf-coniferous forest at 800 m, a coniferous forest at 1 100 m, a Betula ermanii forest at 1 600 m and a grassland at 1 700 m.Important findings The results showed that: (1) altitude had no significant effect on C_soil and C_micconcentrations but had significant effects on soil and microbial biomass N and P concentrations. (2) The activities of BG and NAG decreased significantly with increasing altitude, likely due to the high elevation induced low temperature that inhibits microbial activities. (3) Altitude had significant effects on soil C:N, microbe C:N:P, and exoenzyme C:N:P; exoenzyme C:N:P decreased with the increasing stoichiometric imbalances between microorganisms and soils (ratios of soil C:N:P to microbe C:N:P, respectively). Overall, these results suggested that microorganisms can adapt to the variability of soil C:N:P by regulating their biomass C:N:P and exoenzyme C:N:P, and supported the microbial resource allocation theory.

Key words: stoichiometry, microbial activity, C:N:P, altitude, extracellular enzyme

殷爽, 王传宽, 金鹰, 周正虎. 东北地区大秃顶子山土壤-微生物-胞外酶C:N:P 化学计量特征沿海拔梯度的变化. 植物生态学报, 2019, 43(11): 999-1009. DOI: 10.17521/cjpe.2019.0141

YIN Shuang, WANG Chuan-Kuan, JIN Ying, ZHOU Zheng-Hu. Changes in soil-microbe-exoenzyme C:N:P stoichiometry along an altitudinal gradient in Mt. Datudingzi, Northeast China. Chinese Journal of Plant Ecology, 2019, 43(11): 999-1009. DOI: 10.17521/cjpe.2019.0141

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链接本文: https://www.plant-ecology.com/CN/10.17521/cjpe.2019.0141

https://www.plant-ecology.com/CN/Y2019/V43/I11/999

图/表 5

图1 大秃顶子山不同海拔土壤碳(C)、氮(N)、磷(P)含量及其化学计量比(平均值+标准误差, n = 3)。不同大写字母表示不同海拔间差异显著(p < 0.05)。

Fig. 1 Soil carbon (C), nitrogen (N), and phosphorus (P) concentrations and their stoichiometric ratios under different altitudes in Mt. Datudingzi (mean + SE, n = 3). Different uppercase letters represent significant differences at 0.05 level among different altitudes.

图2 大秃顶子山不同海拔土壤微生物生物量碳(C)、氮(N)、磷(P)含量及其化学计量比(平均值+标准误差, n = 3)。不同大写字母表示不同海拔间差异显著(p < 0.05)。

Fig. 2 Microbial biomass carbon (C), nitrogen (N), and phosphorus (P) concentrations and their stoichiometric ratios under different altitudes in Mt. Datudingzi (mean + SE, n = 3). Different uppercase letters represent significant differences at 0.05 level among different altitudes.

图3 大秃顶子山不同海拔胞外酶碳(C)、氮(N)、磷(P)活性及其化学计量比(平均值+标准误差, n = 3)。不同大写字母表示不同海拔间差异显著(p < 0.05)。AP, 酸性磷酸酶; BG, β-1, 4-葡萄糖苷酶; NAG, 几丁质酶。

Fig. 3 Exoenzyme carbon (C), nitrogen (N), and phosphorus (P) activities and their stoichiometric ratios under different altitudes in Mt. Datudingzi (mean + SE, n = 3). Different uppercase letters represent significant differences at 0.05 level among different altitudes. AP, acid phosphomonoesterase; BG, β-1,4-glucosidase; NAG, N-acetyl-β- glucosaminidase.

图4 大秃顶子山胞外酶化学计量比与土壤和微生物化学计量比之间的相关性。

Fig. 4 Relationships between exoenzyme stoichiometry and soil and microbial stoichiometry in Mt. Datudingzi.

图5 年平均气温和土壤C储量与海拔之间线性关系斜率的相关性。数据来源于Tashi等(2016)的全球整合分析。空心三角为本研究中的斜率。空心圆为异常值。图中斜率代表海拔每升高1 km土壤C储量(kg·m-2)的变化程度。

Fig. 5 Relationship between mean annual temperature and the slope of linear relationship between soil C storage and altitude. The data is from the global meta-analysis of Tashi et al. (2016). The open triangle is the slope from the current study. The open circle is the outlier. The slope stands for the change in soil C storage (kg·m-2) per km increase in elevation.

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东北地区大秃顶子山土壤-微生物-胞外酶C:N:P 化学计量特征沿海拔梯度的变化

Changes in soil-microbe-exoenzyme C:N:P stoichiometry along an altitudinal gradient in Mt. Datudingzi, Northeast China

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