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黄土高原不同植被覆盖下土壤有机碳的分布特征及其同位素组成研究
  • ISSN号：1672-9250
  • 期刊名称：地球与环境
  • 时间：2011
  • 页码：441-449
  • 分类：S153.6[农业科学—土壤学;农业科学—农业基础科学] P597[天文地球—地球化学;天文地球—地质学]
  • 作者机构：[1]中国科学院地球化学研究所 环境地球化学国家重点实验室,贵阳550002, [2]中国科学院北京研究生院,北京100049, [3]中国科学院地质与地球物理研究所,北京100029
  • 相关基金：中国科学院知识创新工程重要方向项目（KZCX2-EW-102）和国家自然科学基金刨新群体项目（40721002）
  • 相关项目：西南喀斯特流域物质循环的生物地球化学过程与生态环境效应
作者： 李龙波|涂成龙|赵志琦|崔丽峰|刘文景|
关键词： 黄土高原, 土壤有机碳, 稳定碳同位素
中文摘要：

土壤有机碳（SOC）含量及其8^13C值随深度变化的趋势可以反映植物残体的输入及其在土壤中分解累积特征，有助于揭示SOC循环过程及规律。本研究以黄土高原不同植被类型覆盖条件下的黄土剖面为研究对象，通过测定土壤属性、SOC含量和植物优势种、枯枝落叶、土壤有机质的稳定同位素组成，对该区域SOC深度分布和有机质8”C值组成差异进行探讨。研究结果显示SOC含量变化范围在1．1～31．2g／kg之间，且随土层深度增加而逐渐降低。SOC主要集中在表层土壤，其含量变化规律为阔叶林地〉针叶林地〉灌木林地〉草地〉荒地。但各剖面SOC在不同土壤层次处出现急剧下降。其中，阔叶林地和针叶林地在i0cm深度处、灌木棘地和草地在20cm深度处和荒地在5cm深度处，SOC含量急剧减少。但60cm深度以下各剖面SOC含量变化均较小。在枯枝落叶转化为表层土壤有机质的过程中，8^13CSOC值升高了0．5‰～3．2‰，与其它地区相比’。C富集更大。剖面8^13C。值在-26．3‰～-20．8‰之间变化，均随着土壤深度的加深而增加。但不同植被条件下的变化幅度各不相同，这反映了土壤有机质分解过程中碳同位素分馏效应的强弱程度。剖面有机质碳同位素分馏程度的变化规律为阔叶林地〉针叶林地〉草地〉灌木林地〉荒地。这可能是由于阔叶袜地上生物量大及微生物对有机质的分解作用强，有机质来源较多且组成、结构不同所致。而荒地剖面坡度很大，地上植被来源较单一，表层枯枝落叶很少，故导致其剖面土壤有机质的分馏效应最低。对比研究表明：不同植被类型覆盖条件下土壤有机质的深度分布特征具有明显差异，土壤有机质的稳定同位素地球化学组成具有地域性特征。

同期刊论文项目
西南喀斯特流域物质循环的生物地球化学过程与生态环境效应
期刊论文 132 著作 1
西南喀斯特流域物质循环的生物地球化学过程与生态环境效应
期刊论文 153 会议论文 9 专利 2
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大陆风化过程的锂同位素地球化学研究进展
乌江流域梯级水库中溶解无机碳及其同位素分异特征
猫跳河流域梯级水库夏-秋季节溶解无机碳（DIC）含量及其同位素组成的分布特征
喀斯特地区丛枝菌根真菌遗传多样性
真菌在陆地生态系统碳循环中的作用
Seasonal variation and sources of low molecular weight organic acids in precipitation in the rural area of Anshun
贵州白鹇湖沉积物记录的4～2kaB．P．干旱气候事件及其生态环境影响
河蚬壳体δ^13C：由水体溶解无机碳重建过去环境变化的代用指标
Stable carbon isotopes in the shell of Corbiculafluminea （Miiller 1774）： Implications for understanding environmental changes in drainage basins
烟曲霉对蛇纹石和橄榄石风化作用的试验研究
桂西北典型峰丛洼地降雨过程中地表水溶解性碳和δ^13CDIC变化特征
喀斯特峡谷型流域主要生态系统的碳分布——以晴隆孟寨流域为例
贵州喀斯特地区土壤细菌群落结构特征及变化
喀斯特坡地土壤稳渗率空间分布变化特征研究研究成果
喀斯特石漠化区小生境特征研究——以贵州清镇王家寨小流域为例
贵阳市地衣分布状况与环境污染分析
微生物絮凝剂对高浓度重金属离子废水絮凝作用研究
喀斯特石漠化区不同小生境常见灌木种叶片δ~（13）C值特征
高压密闭罐溶样-氢化物原子荧光法测定环境样品中的砷
丰水期乌江上游干流水库一河流体系硫同位素组成
猫跳河流域平水期浮游植物与水质评价
热解温度和时间对生物炭pH值的影响
Dissolved inorganic carbon and its isotopic differentiation in cascade reservoirs in the Wujiang drainage basin
河流筑坝拦截的水环境响应——来自地球化学的视角
西安地区大气降水的痕量金属特征及其来源解析
硅酸盐细菌煤炭脱硫实验研究
胶质芽孢杆菌对蛇纹石和橄榄石的解硅作用初探
胶质芽孢杆菌、黑曲霉及与沸石联合对模拟废水中Fe~（3＋）处理研究
不同喀斯特小生境中土壤丛枝菌根真菌的遗传多样性
Seasonal variations in sulfur isotopic composition of dissolved SO4 2- in the Aha Lake, Guiyang and their implications
Diurnal variations of pCO_2 in relation to environ-mental factors in the cascade reservoirs along the Wujiang River, China
期刊信息
  • 《地球与环境》
  • 中国科技核心期刊
  • 主管单位:
  • 主办单位:中国科学院地球化学研究所
  • 主编：王世杰
  • 地址：贵阳市林城西路99号
  • 邮编：55081
  • 邮箱：dzdh@mail.gyig.ac.cn
  • 电话：0851-85891741
  • 国际标准刊号：ISSN：1672-9250
  • 国内统一刊号：ISSN：52-1139/P
  • 邮发代号:66-26
  • 获奖情况:
  • 国内外数据库收录:
  • 美国化学文摘（网络版）,英国动物学记录,中国中国科技核心期刊,中国北大核心期刊（2008版）,中国北大核心期刊（2011版）
  • 被引量:5109