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桂北喀斯特山区不同植被类型土壤碳库管理指数的变化特征

滕秋梅1,沈育伊2,徐广平1*,张中峰1,张德楠1,周龙武1,黄科朝1,孙英杰1,何文1   

  1. (1广西喀斯特植物保育与恢复生态学重点实验室, 广西壮族自治区中国科学院广西植物研究所, 广西桂林 541006;2广西植物功能物质研究与利用重点实验室, 广西壮族自治区中国科学院广西植物研究所, 广西桂林 541006)
  • 出版日期:2020-02-10 发布日期:2020-02-10

Characteristics of soil carbon pool management indices under different vegetation types in karst mountainous areas of North Guangxi.

TENG Qiu-mei1, SHEN Yu-yi2, XU Guang-ping1*, ZHANG Zhong-feng1, ZHANG De-nan1, ZHOU Long-wu1, HUANG Ke-chao1, SUN Ying-jie1, HE Wen1   

  1. (1Guangxi Key Laboratory of Plant Conservation and Restoration Ecology in Karst Terrain, Guangxi Institute of Botany, Guangxi Zhuang Autonomous Region and Chinese Academy of Sciences, Guilin 541006, Guangxi, China; 2Guangxi Key Laboratory of Functional Phytochemicals Research and Utilization, Guangxi Institute of Botany, Guangxi Zhuang Autonomous Region and Chinese Academy of Sciences, Guilin 541006, Guangxi, China).
  • Online:2020-02-10 Published:2020-02-10

摘要: 以广西北部喀斯特石山地区不同植被类型(青冈栎次生林、灌丛、马尾松林、竹林、草地、农田、裸地)土壤为研究对象,探讨植被类型对活性有机碳库以及土壤碳库管理指数的影响,为喀斯特山区生态环境建设提供依据。结果表明:1)青冈栎次生林土壤碳储量、全氮含量、速效氮含量显著高于其他植被,土壤容重小于除农田以外的其他植被类型;2)不同植被类型下土壤有机碳(SOC)、活性有机碳(LOC)含量均随土层深度的增加而降低,0~40 cm土层SOC含量为1.07~29.76 g·kg-1,大小关系表现为青冈栎次生林>灌丛>马尾松林>竹林>草地>农田>裸地;LOC含量为0.58~13.77 g·kg-1,表现为青冈栎次生林>灌丛>马尾松林>竹林>农田>草地>裸地;LOC/SOC表现为青冈栎次生林最小,农田最大;3)土壤碳库管理指数随土层深度的变化为先减小后增加再减小的趋势,0~40 cm土层CPMI平均值表现为青岗栎次生林>灌丛>马尾松林>农田>竹林>草地>裸地;4)土壤植被类型、土层深度以及二者的交互作用对土壤碳库管理指数及碳库特征具有显著影响。本研究表明,增加植被覆盖以及减少人为活动的干扰,能提高土壤有机碳含量,有利于维持桂北喀斯特山区土壤碳库的稳定性。

关键词: 耦合协调, 土地城市化质量, 人口城市化质量

Abstract: To provide a basis for the eco-environment construction in karst mountain area, we examined the variation of soil labile organic carbon pool and carbon pool management index (CPMI) across different types of vegetation, including Cyclobalanopsis glauca secondary forest, shrub, Pinus massoniana forest, bamboo forest, grassland, cropland and bare land in the karst rocky mountain area of Northwest Guangxi. The results showed that: (1) Soil carbon storage and the contents of total nitrogen and available nitrogen in C. glauca secondary forest were significantly higher than that of the other plantations. Soil bulk density was lower than that of the other vegetation types except cropland. (2) The contents of soil organic carbon (SOC) and labile organic carbon (LOC) in all vegetation types decreased with increasing soil depth. The SOC content in 0-40 cm soil layer was 1.07-29.76 g·kg-1, which decreased in the following order of C.glauca secondary forest > shrub >P.massoniana forest > bamboo forest > grassland > cropland > bare land. LOC content was 0.58-13.77 g·kg-1, which decreased in the order of C. glauca secondary forest>shrub>P. massoniana forest>bamboo forest>cropland>grassland>bare land. The SOC/LOC was the lowest in the C. glauca secondary forest and highest in the cropland. (3) The CPMI decreased first and then increased, and decreased again with increasing soil depth. The mean value of CPMI in the 0-40 cm soil layer followed the order: C.glauca secondary forest>shrub>P. massonianaforest>cropland>bamboo forest>grassland>bare land. (4) Vegetation type, soil depth and their interaction had significant effects on CPMI and carbon pool characteristics. Our results indicate that soil organic carbon content and soil carbon pool stability could be improved efficiently by increasing vegetation cover and reducing disturbance from human activities in karst mountain area of North Guangxi.

Key words: coupled coordination., quality of population urbanization, quality of land urbanization