Zheng Lu,Yang Guang,Ma Yunxia,et al.Influencing mechanisms of “fertile island effect” on microbial carbon use efficiency in Nitraria tangutorum nebkhas[J].Research of Soil and Water Conservation,2025,32(05):269-274,287.[doi:10.13869/j.cnki.rswc.2025.05.022]
白刺灌丛沙堆“肥岛效应”对微生物碳利用效率的影响机制
- Title:
- Influencing mechanisms of “fertile island effect” on microbial carbon use efficiency in Nitraria tangutorum nebkhas
- 文章编号:
- 1005-3409（2025）05-0269-06
- Keywords:
- Nitraria tangutorum; soil microorganisms; fertile island effect; enzyme activity; carbon use efficiency
- 分类号:
- Q938
- 文献标志码:
- A
- 摘要:
- [目的] 探究白刺灌丛生长过程中土壤性质及微生物群落特征的变化，阐明其对土壤微生物碳循环过程的影响机制，以揭示灌丛生态系统碳循环的关键驱动因素。[方法] 选择民勤荒漠绿洲过渡带上的不同形态大小的白刺灌丛（Nitraria tangutorum）作为研究对象，利用“空间代替时间”描述灌丛生长过程，测定土壤性质以及土壤微生物生物量、酶活性、碳利用效率（CUE）等指标。[结果]（1）灌丛下方的土壤养分要高于无植被覆盖的丘间空地（CK），灌丛下方的土壤有机碳（SOC）较CK存在显著差异（p<0.05），由高到低分别为大型灌丛（0.48 g/kg）>小型灌丛（0.39 g/kg）>中型灌丛（0.37 g/kg）>CK（0.26 g/kg）。（2）灌丛下方的土壤微生物生物量碳（MBC）、微生物生物量氮（MBN）、微生物生物量磷（MBP）均高于丘间空地（CK），并且随着灌丛生长发育而逐渐增多。灌丛下方的微生物胞外酶β-1，4葡萄糖苷酶（BG）、β-1，4-n-乙酰氨基葡萄糖苷酶（NAG）、亮氨酸氨基肽酶（LAP）和碱性磷酸酶（AP）少于丘间空地，并且随着灌丛生长发育而逐渐降低。（3）随着灌丛生长发育，微生物代谢所受的C限制逐渐减小，大、中、小灌丛矢量长度（即C限制）分别较丘间空地增加-4.74%，-1.08%，0.92%。无论灌丛覆盖与否，研究区的微生物主要受P限制，并且与灌丛生长无关。（4）CUE由大到小分别为CK（48.26%）>中型灌丛（48.00%）>大型灌丛（45.51%）>小型灌丛（44.50%）。其中，小型灌丛的微生物CUE显著低于CK（p<0.05）。[结论] 白刺灌丛通过“肥岛效应”改变土壤微环境，调控微生物代谢策略，进而影响土壤碳循环过程。
- Abstract:
- [Objective] By investigating the variations in soil properties and microbial community characteristics during the growth process of Nitraria tangutorum shrubs, this study aims to elucidate their influencing mechanisms on soil microbial carbon cycling processes, thereby revealing the key driving factors of carbon cycling in shrub ecosystems. [Methods] Nitraria tangutorum shrubs of different sizes were selected as research objects in the Minqin desert-oasis transition zone. The growth process of shrubs was described using a space-for-time substitution approach, with the measurement of soil properties and indicators such as soil microbial biomass, enzyme activity, and carbon use efficiency(CUE). [Results](1) Soil nutrients under the shrubs were higher than those in the bare interdune area without vegetation cover(CK), while soil organic carbon(SOC) under the shrubs was significantly different from that in the CK(p<0.05). The SOC contents from high to low were: large shrubs (0.48 g/kg)>small shrubs(0.39 g/kg)>medium shrubs(0.37 g/kg)>CK(0.26 g/kg).(2) The soil microbial biomass carbon(MBC), microbial biomass nitrogen(MBN), and microbial biomass phosphorus(MBP) under the shrubs were higher than those in the bare interdune area(CK), gradually increasing with the growth of the shrubs. Microbial extracellular enzymes under the shrubs(β -1, 4-glucosidase (BG), β -1, 4-n-acetylglucosaminidase (NAG), leucine aminopeptidase (LAP), and alkaline phosphatase (AP)) were lower than those in the bare interdune area, and they gradually decreased as the shrubs grew.(3) As the shrubs grew, the C limitation on microbial metabolism gradually decreased. The vector lengths(representing C limitation) of large, medium, and small shrubs increased by -4.74%, -1.08%, and 0.92%, respectively, compared to the bare interdune area. Regardless of shrub cover, the microorganisms in the study area were mainly P-limited, independent of shrub growth. (4) The CUE from high to low were: CK (48.26%)>medium shrubs (48.00%)>large shrubs (45.51%)>small shrubs(44.50%). Among them, the microbial CUE of small shrubs was significantly lower than that of CK(p<0.05). [Conclusion] Nitraria tangutorum shrubs alter soil microenvironment through“ fertile island effect”, regulate microbial metabolic strategies, and consequently affect soil carbon cycling processes.
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备注/Memo
收稿日期：2024-12-22 修回日期：2025-01-10 接受日期：2025-01-30
资助项目：内蒙古自治区"揭榜挂帅"项目“十大孔兑风水复合侵蚀区泥沙阻控与近自然生态修复技术集成与示范”（2024JBGS0023）
第一作者：郑路（1999—），男，河南南阳人，在读硕士，主要从事水土保持与荒漠化防治。E-mail：zl15138439353@qq.com
通信作者：杨光（1974—），男，内蒙古鄂尔多斯人，博士，教授，主要从事荒漠化防治与遥感监测方向监测。E-mail：yg331@126.com