文章摘要
喀斯特典型生态系统土壤有机碳积累特征与稳定机制
Characteristics and mechanisms of soil organic carbon accumulation and stability in typical Karst ecosystems
投稿时间:2018-10-11  修订日期:2018-10-16
DOI:10.13872/j.1000-0275.2018.0078
中文关键词: 喀斯特峰丛洼地  生态系统退化  土壤有机碳  微生物  丛植菌根真菌  稳定机制
英文关键词: Karst peak-cluster depression  degradation of ecosystem  soil organic carbon  microorganism  arbuscular mycorrhizal fungi  mechanism of stability
基金项目:广西自然科学基金项目(2017JJA150086y);国家自然科学基金项目(41671298)
作者单位E-mail
陈香碧 中国科学院亚热带农业生态研究所亚热带农业生态过程重点实验室 xbchen@isa.ac.cn 
何寻阳 中国科学院亚热带农业生态研究所亚热带农业生态过程重点实验室 hbhpjhn@isa.ac.cn 
胡亚军 中国科学院亚热带农业生态研究所亚热带农业生态过程重点实验室 yjhu@isa.ac.cn 
苏以荣 中国科学院亚热带农业生态研究所亚热带农业生态过程重点实验室 yrsu@isa.ac.cn 
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中文摘要:
      土壤有机碳是衡量生态系统稳定性、土壤健康与肥力水平的重要指标。喀斯特峰丛洼地土壤具有土被不连续、土层浅薄、高钙、微碱性等特点,造成其有机碳分布、积累与稳定机制有别于其它岩性发育的土壤。基于此,我们在过去10年研究中,建立了基于探地雷达技术的喀斯特非连续性土壤及其有机碳分布的研究方法,研究了土壤微生物总量及其群落、碳氮循环相关功能微生物群落对喀斯特生态系统退化的响应,探讨了喀斯特土壤丛枝菌根真菌群落分布特征及其对岩性、坡位等立地条件的响应,明确了外源有机碳和无机碳(碳酸钙)输入对喀斯特土壤有机碳矿化和积累的影响,从团聚体稳定性、有机碳矿化、激发效应、微生物生物量碳周转角度明确了土壤有机碳的稳定性以黑色石灰土>棕色石灰土>红壤,初步阐明了喀斯特土壤有机碳的稳定性机制,并研发了土壤垂直漏失阻控技术、桑枝原位快速腐熟技术等喀斯特区土壤改良的关键技术。其结果对于揭示喀斯特生态系统有机碳积累与稳定机制、评估喀斯特区土壤固碳的效应与潜力、提升喀斯特生态系统的可持续性有重要科学意义。
英文摘要:
      Soil organic carbon is one of the key indicators to evaluate the stability of ecosystem and the level of soil healthy and fertility. Due to the characteristics of the Karst soil in peak-cluster depression, i.e. discontinuous soil distribution, thin soil layer, high CaCO3 content and slightly alkaline, the distribution, accumulation and stability of soil organic carbon in this karst region could be differed from those soils developed from other lithology. Here, in our researches within the past ten years, the method for estimating organic carbon density in discontinuous Karst soil was established using ground-penetrating radar technology. Meanwhile, the amount and community of soil microorganisms and C and N cycling-related functional microbial populations in responding to the degradation of Karst ecosystems were analyzed. The distribution of arbuscular mycorrhizal fungal community and their responses to lithology and slope were explored. The effects of exogenous organic carbon and inorganic carbon (CaCO3) on the mineralization and accumulation of soil organic carbon were explicated. From the points of aggregate stability, organic carbon mineralization and its priming effect, microbial biomass turnover, it demonstrated that the stability of soil organic carbon followed the order of rendzina > terra fusca > red soil. The mechanisms of the stability of soil organic carbon were clarified. The technologies involved in controlling soil loss via doline and in situ composing branches of mulberry were developed to improve the soil quality in Karst region. Overall, these studies had scientific significance in revealing the mechanism of soil organic carbon accumulation and stability, evaluating the efficiency and potential of soil carbon sequestration in Karst region and improving the sustainability of Karst ecosystems.
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