自然资源学报

自然资源学报 ›› 2012, Vol. 27 ›› Issue (3): 430-439.doi: 10.11849/zrzyxb.2012.03.009

• 资源生态 • 上一篇    下一篇

小流域土壤有机碳的分布和积累及土壤水分的影响

邹俊亮1, 郭胜利1,2, 李泽1, 张芳1, 张彦军1, 周小刚2, 南雅芳1   

  1. 1. 西北农林科技大学 资源环境学院,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
  • 收稿日期:2011-05-09 修回日期:2011-07-14 出版日期:2012-03-20 发布日期:2012-03-20
  • 通讯作者: 郭胜利(1969- ),男,河北栾城人,研究员,主要从事土壤生态研究。E-mail:slguo@ms.iswc.ac.cn E-mail:slguo@ms.iswc.ac.cn
  • 作者简介:邹俊亮(1987- ),男,江西宜春人,硕士研究生,主要从事土壤生态研究。E-mail:jlzou@live.cn
  • 基金资助:

    国家自然科学基金资助项目(41071338);黄土高原土壤侵蚀与旱地农业国家重点实验室专项(10502-Z11)。

Soil Organic Carbon Accumulation and Distribution in a Small Watershed and the Effects of Soil Water

ZOU Jun-liang1, GUO Sheng-li1,2, LI Ze1, ZHANG Fang1, ZHANG Yan-jun1, ZHOU Xiao-gang2, NAN Ya-fang1   

  1. 1. College of Resources and Environment, Northwest A & F University, Yangling 712100, China;
    2. State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, CAS and MWR, Yangling 712100, China
  • Received:2011-05-09 Revised:2011-07-14 Online:2012-03-20 Published:2012-03-20

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被引次数

24 | 12

摘要： 地形和土地利用决定的土壤水分和土壤有机碳(Soil Organic Carbon,SOC)的空间分布格局为研究水碳关系提供了重要的线索,但土壤水分的强变异性和SOC的相对稳定性对土壤水碳关系的研究提出了挑战。研究基于陆地水量平衡角度,选择雨季后土壤水分恢复期在晋西黄土丘陵小流域尺度进行了重复采样,按照3种地貌类型(沟底、 沟坡、 峁坡)和3种土地利用方式(农地、 林地、 草地)共布置37个样点,采集0~100 cm土壤样品测定土壤水分和SOC,探讨土壤水分与SOC分布特征及其相互关系。结果表明:同一土地利用方式下,土壤水分和SOC总体上沟底>沟坡>峁坡;同一地貌类型下,土壤水分农地>草地>林地,SOC农地<草地<林地。SOC与土壤水分呈现正相关关系,二者符合指数增长(y=y0+log a×ax,y为SOC,x为土壤水分)关系,因地貌部位和土地利用方式的不同决定系数在7%~37%之间变化。这一结果为基于土壤水分变化预测SOC积累和分布提供了参考。

关键词: 土壤, 土壤有机碳, 小流域, 土壤水分

Abstract: The spatial distribution patterns of soil water and Soil Organic Carbon(SOC) caused by topography and land use provide opportunities to study the coupling of water and carbon of the terrestrial ecosystem. It can help us better understand the contribution of soil water to SOC accumulation and distribution at a watershed scale, but the strong variability of soil water and relative stability of SOC bring new challenges for the work. Thereafter, a resampling approach was used to assess soil water and SOC after rainy season based on the continental water balance. Totally 37 plots covering three different landforms and three different land uses were sampled 100 cm below surface soil using a 3 cm diameter auger. When compared under the same land use, generally soil water and SOC of valley bottom was higher than ridge slope, while gully slope was intermediate; but the water-carbon transferring efficiency presented an inverse order. Under the same landform, soil water and SOC of different land uses had the opposite order, when farmland owned the highest water content, its SOC was the lowest; the same occurred at grassland and woodland. Both the woodland and grassland could transfer water to carbon faster compared to farmland. There was a positive relationship fitted well by an exponential growth model (y=y0+log a×ax) between SOC and soil water. Soil water could partially (7%－37%) explain SOC accumulation and distribution in the small watershed. This would be very crucial for the prediction of SOC accumulation and distribution based on soil water variability.

Key words: soil, soil organic carbon, small watershed, soil water

中图分类号: 

  • S153.6