岩溶断陷盆不同深度土壤微生物量碳氮对植被演替的响应

严嘉慧; 邱江梅; 李强

doi:10.11932/karst20230519

岩溶断陷盆不同深度土壤微生物量碳氮对植被演替的响应

doi: 10.11932/karst20230519

严嘉慧^{1, 2,},
邱江梅^{1, 2},
李强^{1, 2, ,}

1.
中国地质科学院岩溶地质研究所/自然资源部、广西岩溶动力学重点实验室/联合国教科文组织国际岩溶研究中心，广西桂林541004
2.
广西平果喀斯特生态系统国家野外科学观测研究站, 广西平果 531406

基金项目: 国家重点研发计划课题(2016YFC0502501)

详细信息

作者简介:
严嘉慧（1996－），女，硕士研究生，主要从事岩溶土壤微生物研究。E-mail：mauoko_es@yeah.net

通讯作者:
李强（1978－），男，研究员，博士，主要从事岩溶生物地球化学研究。E-mail：glqiangli@163.com

中图分类号: S154.2
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出版历程
- 收稿日期: 2022-11-10
- 刊出日期: 2023-10-01

Response of soil microbial biomass carbon and nitrogen to vegetation succession in different soil depths of karst fault basin

YAN Jiahui^{1, 2
,},
QIU Jiangmei^{1, 2},
LI Qiang^{1, 2
, ,}

1.
Institute of Karst Geology, CAGS/Key Laboratory of Karst Dynamics, MNR & GZAR/ International Research Center on Karst under the Auspices of UNESCO, Guilin, Guangxi 541004, China
2.
Pingguo Guangxi, Karst Ecosystem, National Observation and Research Station, Pingguo, Guangxi 531406, China

摘要

摘要: 为了解岩溶断陷盆地底部不同植被类型土壤微生物量碳氮（MBC、MBN）含量的变化，以中国西南典型生态脆弱区云南省岩溶断陷盆地底部原始森林、草地、人工林、灌丛和玉米地土壤为研究对象，探究土壤微生物量碳氮对植被类型的响应。结果表明：灌丛类型土壤微生物量碳氮含量最高，微生物量碳氮含量随植被正向演替呈现先增大后减小的趋势；各植被类型土壤微生物量碳含量随土层深度增加而降低。多因素方差分析出土层深度和植被类型是土壤微生物量碳含量的显著影响因素（P＜0.05），其中土层深度是土壤微生物量碳含量的极显著影响因素（P＜0.01）。
- 岩溶 /
- 断陷盆地 /
- 微生物量碳 /
- 微生物量氮 /
- 植被类型
Abstract: The karst fault basin in Yunnan Province is a typical ecological fragile area in Southwest China, and it is characterized by dramatic topographic changes, coexistence of faulted basins, basins and mountains, and seasonal drought and water shortage, so surface water erosion likely occurs. Soil microorganism promotes the circulation of nutrient elements in soil, among which microbial biomass carbon (MBC) and microbial biomass nitrogen (MBN)—the indicators of soil quality—are of great research significance. In this study, primitive forests, grasslands, artificial forests, shrubs and corn fields in the karst fault basin of Yunnan were selected as the study objects. The changes of MBC and MBN in soil were measured, and then their response to vegetation types was analyzed. The results showed that the contents of soil MBC and MBN in shrubs were the highest, indicating that the shrubs in this study area are more conducive to the accumulation of soil MBC and MBN. In contrast, the contents of soil MBC and MBN in primary forests were lower than those in shrubs, which was considered to be the result of the the decrease of effective nutrients available for vegetation growth due to the degradation of primary forests, or the intense competition between plant growth and microorganisms for nutrients in primary forests and the fact that the demand capacity of vegetation growth was greater than the conversion capacity of soil microorganisms. The study also found that the contents of MBC and MBN increased at first and then decreased with vegetation succession, which may be related to the organic matter content and oxygen availability as well as the surface layer that conforms to microbial growth conditions. The content of soil MBC decreased with the increase of soil depth. Moreover, the soil depth and vegetation type are the significant influencing factors of the content of soil MBC (P<0.05), and the soil depth was the most significant factor (P<0.01). These findings provide a theoretical basis for the control of soil erosion and rocky desertification in karst fault basin of Yunnan Province.
- karst /
- fault basin /
- microbial biomass carbon /
- microbial biomass nitrogen /
- vegetation types

HTML

图 1 MBC在不同土层、不同植被演替阶段的差异变化(P<0.05)

注：小写字母表示同一土层不同植被类型间差异显著(P < 0.05)，大写字母表示同一植被类型不同土层间差异显著(P < 0.05)，下同。

Figure 1. Variation of MBC in different soil layers and different vegetation succession stages (P < 0.05)

Note: Lowercase letters represent significant difference of different vegetation types in the same soil layer; capital letters represent significant difference of different soil layers in the same vegetation type (the same hereinafter).

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图 2 MBN在不同土层、不同植被演替阶段的差异变化（P<0.05）

Figure 2. Variation of MBN in different soil layers and different vegetation succession stages (P < 0.05)

下载: 全尺寸图片幻灯片

表 1 采样点基本情况表

Table 1. Basic information of sampling points

植被类型	土层深度/cm	经度（E）	纬度（N）	海拔/m	优势物种
草地	上层（0~10）下层（10~20）	103°51′0″	24°30′32″	2 332.8	火棘（Pyracantha fortuneana）、针茅（Stipa capillata Linn）、狗牙根（Cynodondactylon(Linn.) Pers）、蕨类（Fern）
灌丛	上层（0~10）下层（10~20）	103°51′10″	24°30′29″	2 292.2	灌草丛（Shrubbery）、檵木（Loropetalum chinense (R. Br.) Oliver）、小果蔷薇（Rosa cymosa Tratt）、火棘（Pyracantha fortuneana）
人工林	上层（0~10）下层（10~20）	103°51′0″	24°30′29″	2 314.6	川东桤木（Alnus cremastogyne Burk）
原始森林	上层（0~10）下层（10~20）	103°53′38″	24°30′32″	2 341.5	云南松（Pinus yunnanensis）、小果蔷薇（Rosa cymosa Tratt）、火棘（Pyracantha fortuneana）
玉米地	上层（0~10）下层（10~20）	103°51′3″	24°30′29″	2 291.0	玉米（Zea mays）

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表 2 植被类型和土层深度对土壤 MBC 含量的影响

Table 2. Effects of vegetation types and soil depthson soil MBC content

影响因子	自由度（df）	方差（F）	显著性（P）
植被类型	4	4.139	0.013
土层深度	1	22.431	<0.001
植被类型 × 土层深度	4	2.282	0.096
注：P<0.05表示显著，P< 0.01表示极显著。 Note: P<0.05 represents significance; P< 0.01 represents extremely significance.

下载: 导出CSV

表 3 植被类型和土层深度对土壤 MBN 含量的影响

Table 3. Effects of vegetation types and soil depthson soil MBN content

影响因子	自由度（df）	方差（F）	显著性（P）
植被类型	4	1.556	0.225
土层深度	1	0.491	0.491
植被类型×土层深度	4	0.871	0.499
注：P<0.05表示显著，P< 0.01表示极显著。 Note: P<0.05 represents significance; P< 0.01 represents extremely significance.

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