喀斯特区不同岩性发育的土壤上植物-枯落物-土壤系统

邹军; 喻理飞; 李媛媛; 黄宗胜

doi:10.13870/j.cnki.stbcxb.2020.01.027

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喀斯特区不同岩性发育的土壤上植物-枯落物-土壤系统

更新时间：2025-03-12

- 喀斯特区不同岩性发育的土壤上植物-枯落物-土壤系统
- Changes in
- 水土保持学报 2020年34卷第1期页码：186-194
- 作者机构：
  
  1. 贵州大学林学院,贵阳,550025
  2. 贵州大学生命科学院,贵阳,550025
  3. 山地植物资源保护与种质创新教育部重点实验室, 山地生态与农业生物工程协同创新中心,贵阳,550025
  4. 贵州省植物园,贵阳,550004
- 作者简介：
- 基金信息：
  
  国家自然科学基金项目（31560187）国家重点研发计划项目（2016YFC0502604）贵州省重大专项（黔科合JZ字[2014]2002）
- DOI：10.13870/j.cnki.stbcxb.2020.01.027
  中图分类号： S718.5
- 纸质出版：2020
- 稿件说明：
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邹军, 喻理飞, 李媛媛, 等. 喀斯特区不同岩性发育的土壤上植物-枯落物-土壤系统[J]. 水土保持学报, 2020,34(1):186-194.

ZOU Jun, YU Lifei, LI Yuanyuan and HUANG Zongsheng. Changes in[J]. 2020, 34(1): 186-194.
邹军, 喻理飞, 李媛媛, 等. 喀斯特区不同岩性发育的土壤上植物-枯落物-土壤系统[J]. 水土保持学报, 2020,34(1):186-194. DOI： 10.13870/j.cnki.stbcxb.2020.01.027.

ZOU Jun, YU Lifei, LI Yuanyuan and HUANG Zongsheng. Changes in[J]. 2020, 34(1): 186-194. DOI： 10.13870/j.cnki.stbcxb.2020.01.027.

摘要

为了解喀斯特区不同岩性发育的土壤上林分碳元素循环特征，采用稳定碳同位素技术，研究贵州省喀斯特区白云岩、白云质砂岩、石灰岩3种岩性发育的土壤上猴樟（Cinnamomum bodinieri）、柏木（Cupressus funebris）、马桑（Coriaria nepalensis）、光皮桦（Betula luminifera）、桤木（Alnus cremastogyne）和圆果化香（Platycarya longipes）6种树种为优势种构建的林分的优势种植物-枯落物-土壤系统δ13C值的变化和土壤有机质更新。结果表明：（1）部分树种在不同岩性上的δ13C存在差异，石灰岩上柏木δ13C值与其他岩性呈极显著性差异（P<0.001），桤木在石灰岩与白云岩上呈显著性差异（P=0.024）；不同树种表现为猴樟、柏木、马桑3个树种相互间或与其他树种多表现出显著性或极显著差异（P<0.05或P=0.001）；树种各器官δ13C值呈叶片δ13C值存在极显著差异（P<0.001），土壤层与枯落物层比较，增幅较大的是白云质砂岩上的猴樟林和柏木林，分别为11.68‰，11.10‰，增幅较小的是白云岩上的马桑林和石灰岩上的桤木林，分别为1.07‰，2.73‰。（3）土壤有机质更新率最大为白云岩上马桑林43.84%，其次为石灰岩上桤木林34.17%，最低为石灰岩上的圆果化香林1.15%。白云岩上植物群落的有机碳周转率回归方程斜率K值为3.15，石灰岩上为0.85。白云质砂岩上林分的有机碳含量与δ13C值无相关性。研究结果对揭示喀斯特地区C元素循环及迁移特征和养分迁移特征具有重要意义。

Abstract

In order to understand the C cycle characteristics in dominant tree communities in soils developed form different lithologies in Karst area

the δ13C value and soil organic matter renewal of various tree species communities were measured for six woody species (cypress

Cupressus funebris; mansur shrub

Coriaria nepalensis; camphor

Cinnamomum bodinieri; birch

Betula luminifera; alder

Alnus cremastogyne and dyetree

Platycarya longipes) planted in three different lithologic soil types (dolomite

dolomite sandstone

limestone) in the karst area of Guizhou Province. Results showed that:(1) Changes of δ13C values in plant species in different lithologies

the δ13C value of cypress funebris on limestone had very significant difference with other lithologies (P<0.001)

Alnus cremastogyne had significant difference in limestone and dolomite (P=0.024). There were significant or extremely significant differences among three tree species (Cinnamomum bodinieri

Cupressus funebris

Coriaria nepalensis)

or with other tree species (P<0.05 or P=0.001). The δ13C values of each organ in tree species were leaf < branch < root. (2) Changes of δ13C values in plant-litter-soil system:on the three lithologies

the change law of community of each tree species was basically the same

that is

plant leaves (fresh litter) < litter decomposition layer < branch < root < upper soil < lower soil. There was a significant difference in δ13C values between soil layer and plant and litter (P<0.001). Compared with litter layer

the increased degree of community of Cinnamomum bodinieri and Cupressus funebris on dolomitic sandstone was larger

11.68‰ and 11.10‰ respectively

while the increased degree of Coriaria nepalensis on dolomite and Alnus cremastogyne on limestone was smaller

by 1.07‰ and 2.73‰

respectively. (3) Renewal rate of soil organic matter:the highest was the community of Coriaria nepalensis on dolomite

43.84%

followed by the community of Alnus cremastogyne on limestone

34.17%

and the lowest was the community of Platycarya longipes on limestone

1.15%. Organic carbon turnover showed that the slope K of regression equation of dolomite plant community was 3.15

followed by plant communities on limestone was 0.85. The organic carbon contents were not correlated with δ13C values in dolomitic sandstone. The results of the study would be of great significance to reveal the characteristics of C cycle

migration and nutrient transfer in different plant communities in lithologies of karst area.

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