| 粤北山区近25年来耕地表层土壤有机碳变化分析 |
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| 引用本文： | 文雅,邓南荣,刘晓南,程炯,魏建兵.粤北山区近25年来耕地表层土壤有机碳变化分析[J].生态环境,2011(8):1247-1252. |
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| 作者姓名： | 文雅 邓南荣 刘晓南 程炯 魏建兵 |
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| 作者单位： | [1]中国科学院广州地球化学研究所,广东广州510640 [2]中国科学院研究生院,北京100039 [3]华南农业大学,广东广州510642 [4]广东省生态环境与土壤研究所,广东广州510650 |
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| 基金项目： | 广东省自然科学基金项目（04201163）; 广东省省科技计划项目（2008A020100010） |
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| 摘 要： | 以粤北山区典型区的连州市为例,利用第二次土壤普查资料和2007年耕地地力调查样点分析结果,对研究区耕地表层（0~20 cm）土壤有机碳质量分数和有机碳密度的变化特征进行了分析。结果表明：25年以来,连州市耕地表层有机碳质量分数和密度有所增加,分别从1982年的16.3 g·kg-1、40.88 t·hm-2上升到2007年的17.37 g·kg-1、43.31 t·hm-2。土壤有机碳随土壤类型的不同而变化复杂,土壤有机碳呈上升趋势的有潴育型水稻土、淹育型水稻土、渗育型水稻土,而沼泽型水稻土、潜育型水稻土和矿毒田呈下降趋势,主要旱地土壤类型（黄壤、红壤、红色石灰土、酸性紫色土）表层土壤有机碳质量分数呈上升趋势。从土地利用类型综合考量,水田、旱地表层土壤有机碳质量分数和密度都呈上升趋势,其中水田的有机碳质量分数和密度分别由80年代初期的18.30 g·kg-1、44.80 t·hm-2上升到2007年的18.78 g·kg-1、46.21 t·hm-2;旱地的有机碳质量分数和密度分别由80年代初期的10.46 g·kg-1、29.27 t·hm-2上升到2007年的13.17 g·kg-1、34.67 t·hm-2。粤北山区耕地表层土壤总体上表现为碳汇。
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| 关 键 词： | 土壤有机碳 有机碳密度 耕地表层土壤 粤北山区 |
Variations of soil organic carbon of cropland topsoil in mountain area of northern Guangdong over 25 Years |
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| Institution: | WEN Ya1,2,3,DENG Nanrong4,LIU Xiaonan1,2,4,CHENG Jiong4,WEI Jianbin4 1.Guangzhou Institute of Geochemistry,Chinese Academic of Science,Guangzhou 510640,China;2.Graduate University of Chinese Academic of Science,Beijing 100039,China;3.College of informatics,South China Agriculture University,Guangzhou 510642,China;4.Guangdong Institute of Eco-environment and Soil Science,Guangzhou 510650,China |
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| Abstract: | By using the soil basic data from the Second National Soil Survey at the Beginning of 1980＇s in the 20th century and the Cropland Capacity Survey in 2007,this paper studied the variations of soil organic carbon content and density in topsoil of cropland in Lianzhou city,a typical area in mountain region of northern Guangdong province.The results indicate that：（1） there is an upward trend in the SOC content and density of cropland topsoil over the last 25 years.The mean SOC content increased from 16.g.kg-1 in 1982 to 17.37 g.kg-1 in 2007.The SOC density is from 40.88 t.hm-2 to 43.31 t.hm-2.（2） The changes of SOC are complex with soil types.The SOC content and density show an upward trend in water-logging,Submerged and Percogenic paddy soil.In contrast,there is descent trend in boggy,gleyed and ore poisoned paddy soil.The content and density of topsoil SOC is upward trend in main dryland soil types including yellow soil,red soil,red limestone soils and acid purplish soils.（3） According to the land use types,the SOC content and density also show an upward trend.The content and density of SOC in paddy field rise from 18.30 g.kg-1、44.80 t.hm-2 in 1982 to 18.78 g.kg-1、46.21 t.hm-2 in 2007 respectively.At the same time,from 10.46 g.kg-1、29.27 t.hm-2 to 13.17 g.kg-1、 34.67 t.hm-2 in dryland.In generally,the corpland topsoil presented carbon sink in mountain area of northern Guangdong. |
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| Keywords: | SOC density of SOC corpland topsoil mountain area of nothren Guangdong |
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