| 植被自然恢复过程中土壤有机碳密度与微生物量碳动态变化 |
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| 引用本文： | 郭曼,郑粉莉,安韶山,刘雨,安娟.植被自然恢复过程中土壤有机碳密度与微生物量碳动态变化[J].水土保持学报,2010,24(1). |
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| 作者姓名： | 郭曼 郑粉莉 安韶山 刘雨 安娟 |
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| 作者单位： | 1. 西北农林科技大学资源环境学院,陕西杨凌712100;中国科学院水利部水土保持研究所黄土高原土壤侵蚀与旱地农业国家重点实验室,陕西杨凌712100
2. 中国科学院水利部水土保持研究所黄土高原土壤侵蚀与旱地农业国家重点实验室,陕西杨凌,712100 |
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| 基金项目： | 中国科学院西部行动计划(二期)项目“水文过程响应及其模拟”(KZCX2-XB2-05-03); 西北农林科技大学创新团队计划项目“土壤侵蚀及其治理环境效应评价”(01140202) |
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| 摘 要： | 以黄土丘陵区典型草原带宁夏固原地区为例,研究了退耕地在植被自然恢复过程中土壤有机碳密度及微生物量碳的动态变化。结果表明,植被自然恢复过程中,土壤有机碳(SOC)和微生物量碳(SMBC)表现为0-5cm土层5-10cm土层10-20cm土层,且在不同土层之间的差异性达到极显著水平(P0.01)。SOC和SMBC在植被自然恢复过程中亦表现出一定的表聚性。土壤剖面各土层SOC和SMBC皆随植被恢复年限的增加总呈上升趋势,且与恢复年限之间呈极显著的对数函数关系。植被恢复0～23a期间,表层土壤(0-5cm)SOC和SMBC年增长率分别为4.81%和6.96%,增加幅度较大;植被恢复23～75a期间,表层土壤SOC和SMBC的年增长率均为0.25%,增加趋势减缓。土壤剖面各土层微生物熵(SMQ)变化于2.113～4.375。土壤有机碳周转速率在恢复前期(0～12a)较快,恢复后期(12～75a)趋于稳定,土壤有机碳积累与转化主要发生在土壤表层。SOC和SMBC之间有极显著的线性正相关关系。植被恢复0～23a期间,与对照农地相比,0-20cm土层土壤有机碳密度增加了85.23%,增加速率较快;而在植被恢复23～75a期间,有机碳密度仅增加了6.60%,增幅减缓。表明植被自然恢复有助于黄土丘陵区土壤有机碳储量的增加,促进土壤碳固定。
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| 关 键 词： | 植被自然恢复 土壤有机碳密度 土壤微生物量碳 典型草原带 黄土丘陵区 |
Dynamic Change of Soil Organic Carbon Density and Microbial Biomass Carbon during Natural Revegetation |
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| GUO Man,ZHENG Fen-li,AN Shao-shan,LIU Yu,AN Juan.Dynamic Change of Soil Organic Carbon Density and Microbial Biomass Carbon during Natural Revegetation[J].Journal of Soil and Water Conservation,2010,24(1). |
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| Authors: | GUO Man ZHENG Fen-li AN Shao-shan LIU Yu AN Juan |
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| Institution: | GUO Man1,2,ZHENG Fen-li1,AN Shao-shan1,LIU Yu1,AN Juan2 (1.College of Resources , Environment,Northwest A&F University,Yangling,Shaanxi 712100,2.State Key Laboratory of Soil Erosion , Dryl, Farming in Loess Plateau,Institute of Soil , Water Conservation,CAS & MWR,Shaanxi 712100) |
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| Abstract: | Soil carbon density and soil microbial biomass carbon (SMBC) were studied based on the different chronosequence sites during the revegetation process on loess hilly-gully area in southern Ningxia. The results showed that soil organic carbon (SOC) and microbial biomass carbon in the soil profile were 0-5 cm soil layer>5-10 cm soil layer>10-20 cm soil layer. There were significant differences among layers of SOC and SMBC. During natural revegetation,the enrichment effects of SOC and SMBC in the soil surface w... |
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| Keywords: | natural revegetation soil organic carbon density microbial biomass carbon typical grassland loess hilly-gully area |
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