植物生态学报 ›› 2018, Vol. 42 ›› Issue (10): 1022-1032.DOI: 10.17521/cjpe.2018.0121
所属专题: 生态化学计量
收稿日期:
2018-05-23
出版日期:
2018-10-20
发布日期:
2019-01-30
通讯作者:
安慧 ORCID: 0000-0002-5881-4213
基金资助:
WU Xiu-Zhi1,YAN Xin1,WANG Bo2,LIU Ren-Tao1,AN Hui1,*()
Received:
2018-05-23
Online:
2018-10-20
Published:
2019-01-30
Contact:
Hui AN
Supported by:
摘要:
为探讨荒漠草地沙漠化对“土壤-微生物-胞外酶”系统生态化学计量的影响机理, 该研究采用空间序列代替时间演替的方法, 研究了宁夏盐池荒漠草地沙漠化过程中土壤、土壤微生物及土壤胞外酶碳(C)、氮(N)、磷(P)生态化学计量的变异特征。结果表明: (1)随着荒漠草地沙漠化的不断加剧, 土壤C、N、P含量和土壤C:P、N:P均呈降低趋势, 而土壤C:N逐渐增加。(2)荒漠草地沙漠化过程中, 土壤微生物生物量C (MBC):微生物生物量P (MBP)、微生物生物量N (MBN):MBP和土壤β-葡萄糖苷酶(BG):N-乙酰氨基葡萄糖苷酶(NAG)逐渐降低, 而土壤BG:磷酸酶(AP)和NAG:AP基本表现为增加趋势。(3)随着荒漠草地沙漠化程度的加剧, 土壤微生物C利用效率CUEC:N和CUEC:P与土壤微生物N利用效率NUEN:C和土壤微生物P利用效率PUEP:C的变化趋势相反。(4)荒漠草地土壤、土壤微生物生物量和土壤胞外酶C:N化学计量(C:N, MBC:MBN, BG:NAG)与土壤、土壤微生物生物量和土壤胞外酶N:P化学计量(N:P, MBN:MBP, NAG:AP)显著负相关, 而土壤和胞外酶C:N化学计量(C:N, BG:NAG)与土壤和胞外酶C:P化学计量(C:P, BG:AP)显著正相关。土壤N:P与土壤MBN:MBP显著正相关, 而与土壤NAG:AP显著负相关。分析表明, 荒漠草地沙漠化过程中土壤微生物生物量及胞外酶活性随着土壤养分的变化而发生变化; 微生物-胞外酶C:N:P生态化学计量与土壤养分存在协变关系, 为理解荒漠草地土壤-微生物系统C、N、P循环机制提供理论依据。
吴秀芝, 阎欣, 王波, 刘任涛, 安慧. 荒漠草地沙漠化对土壤-微生物-胞外酶化学计量特征的影响. 植物生态学报, 2018, 42(10): 1022-1032. DOI: 10.17521/cjpe.2018.0121
WU Xiu-Zhi, YAN Xin, WANG Bo, LIU Ren-Tao, AN Hui. Effects of desertification on the C:N:P stoichiometry of soil, microbes, and extracellular enzymes in a desert grassland. Chinese Journal of Plant Ecology, 2018, 42(10): 1022-1032. DOI: 10.17521/cjpe.2018.0121
图1 土壤C、N、P含量及其生态化学计量特征(平均值±标准偏差)。FD, 固定沙地; G, 荒漠草地; MD, 流动沙地; SFD, 半固定沙地。不同小写字母表示阶段的差异显著(p < 0.05)。
Fig. 1 Characteristics of soil C、N、P content and C:N:P ecological stoichiometry (mean ± SD) at different stages of desertification. FD, fixed dunes; G, grasslands; MD, mobile dunes SFD, semi-fixed dunes. Different lowercase letters indicate significance differences among stages (p < 0.05).
图2 土壤微生物生物量及土壤胞外酶C:N:P生态化学计量特征(平均值±标准偏差)。FD, 固定沙地; G, 荒漠草地; MD, 流动沙地; SFD, 半固定沙地。AP, 磷酸酶; BG, β-葡萄糖苷酶; NAG, N-乙酰氨基葡萄糖苷酶。不同小写字母表示阶段的差异显著(p < 0.05)。
Fig. 2 C:N:P ecological stoichiometry of soil microbial biomass and soil extracellular enzymes (mean ± SD) at different stages of desertification. FD, fixed dunes; G, grasslands; MD, mobile dunes SFD, semi-fixed dunes. AP, alkaline phosphatase; BG, β-1,4-glucosidase; NAG, β-1,4-N-acetylglucosaminidase. Different lowercase letters indicate significance differences among stages (p < 0.05).
沙化阶段 Desertification stage | CUEC:N | CUEC:P | NUEN:C | PUEP:C |
---|---|---|---|---|
荒漠草地 Grasslands | 0.25 ± 0.06a | 0.84 ± 0.02a | 0.37 ± 0.06a | 0.13 ± 0.03a |
固定沙地 Fixed dunes | 0.26 ± 0.05a | 0.85 ± 0.03a | 0.40 ± 0.04ab | 0.08 ± 0.03a |
半固定沙地 Semi-fixed dunes | 0.36 ± 0.04ab | 0.85 ± 0.02a | 0.29 ± 0.05ab | 0.10 ± 0.02ab |
流动沙地 Mobile dunes | 0.52 ± 0.04b | 0.90 ± 0.01a | 0.23 ± 0.02b | 0.01 ± 0.01b |
表1 不同沙化阶段土壤微生物养分利用效率特征(平均值±标准偏差)
Table 1 Characteristics of soil microbial nutrient utilization efficiency at different desertification stages (mean ± SD)
沙化阶段 Desertification stage | CUEC:N | CUEC:P | NUEN:C | PUEP:C |
---|---|---|---|---|
荒漠草地 Grasslands | 0.25 ± 0.06a | 0.84 ± 0.02a | 0.37 ± 0.06a | 0.13 ± 0.03a |
固定沙地 Fixed dunes | 0.26 ± 0.05a | 0.85 ± 0.03a | 0.40 ± 0.04ab | 0.08 ± 0.03a |
半固定沙地 Semi-fixed dunes | 0.36 ± 0.04ab | 0.85 ± 0.02a | 0.29 ± 0.05ab | 0.10 ± 0.02ab |
流动沙地 Mobile dunes | 0.52 ± 0.04b | 0.90 ± 0.01a | 0.23 ± 0.02b | 0.01 ± 0.01b |
Soil C:N | Soil C:P | Soil N:P | MBC:MBN | MBC:MBP | MBN:MBP | BG:NAG | BG:AP | NAG:AP | ||
---|---|---|---|---|---|---|---|---|---|---|
Soil C:N | 1 | 0.760** | -0.396* | 0.149 | -0.118 | -0.143 | -0.249 | -0.194 | 0.131 | |
Soil C:P | 1 | 0.159 | 0.100 | 0.096 | 0.260 | 0.230 | 0.071 | -0.207 | ||
Soil N:P | 1 | -0.157 | 0.435* | 0.573** | 0.543** | 0.217 | -0.427** | |||
MBC:MBN | 1 | -0.038 | -0.604** | -0.150 | -0.185 | 0.039 | ||||
MBC:MBP | 1 | 0.570** | 0.198 | 0.149 | -0.224 | |||||
MBN:MBP | 1 | 0.427* | 0.203 | -0.366* | ||||||
BG:NAG | 1 | 0.542** | -0.706** | |||||||
BG:AP | 1 | 0.102 | ||||||||
NAG:AP | 1 |
表2 土壤-微生物-胞外酶生态化学计量的相关性分析
Table 2 Correlation analysis among soil, microbial and extracellular enzyme ecological stoichiometry
Soil C:N | Soil C:P | Soil N:P | MBC:MBN | MBC:MBP | MBN:MBP | BG:NAG | BG:AP | NAG:AP | ||
---|---|---|---|---|---|---|---|---|---|---|
Soil C:N | 1 | 0.760** | -0.396* | 0.149 | -0.118 | -0.143 | -0.249 | -0.194 | 0.131 | |
Soil C:P | 1 | 0.159 | 0.100 | 0.096 | 0.260 | 0.230 | 0.071 | -0.207 | ||
Soil N:P | 1 | -0.157 | 0.435* | 0.573** | 0.543** | 0.217 | -0.427** | |||
MBC:MBN | 1 | -0.038 | -0.604** | -0.150 | -0.185 | 0.039 | ||||
MBC:MBP | 1 | 0.570** | 0.198 | 0.149 | -0.224 | |||||
MBN:MBP | 1 | 0.427* | 0.203 | -0.366* | ||||||
BG:NAG | 1 | 0.542** | -0.706** | |||||||
BG:AP | 1 | 0.102 | ||||||||
NAG:AP | 1 |
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