自然资源学报 ›› 2015, Vol. 30 ›› Issue (6): 1005-1012.doi: 10.11849/zrzyxb.2015.06.011

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青海乐都县30a来农田表层土壤有机碳储量变化特征

李娜娜1, 张彦军1, 周小刚2, 邹俊亮3, 刘庆芳3, 李俊超3, 刘京3, 郭慧敏2, 王蕊3, 郭胜利1,2,3   

  1. 1. 西北农林科技大学水土保持研究所, 陕西杨凌712100;
    2. 中国科学院、水利部水土保持研究所, 陕西杨凌712100;
    3. 西北农林科技大学资源与环境学院, 陕西杨凌712100
  • 收稿日期:2014-05-09 修回日期:2014-09-17 出版日期:2015-06-20 发布日期:2015-06-20
  • 通讯作者: 郭胜利,E-mail:slguo@ms.iswc.ac.cn E-mail:slguo@ms.iswc.ac.cn
  • 作者简介:李娜娜(1989-),女,陕西省榆林市人,硕士研究生,主要研究方向为土壤碳循环及生态环境.E-mail:linana@nwsuaf.edu.cn
  • 基金资助:

    中国科学院战略性先导科技专项(XDA05050504).

Changing Characteristics of Soil Organic Carbon Storage in Cropland in Ledu of Qinghai in Recent 30 Years

LI Na-na1, ZHANG Yan-jun1, ZHOU Xiao-gang2, ZOU Jun-liang3, LIU Qing-fang3, LI Jun-chao3, LIU Jing3, GUO Hui-min2, WANG Rui3, GUO Sheng-li1,2,3   

  1. 1. Institute of Soil and Water Conservation, Northwest A & F University, Yangling 712100, China;
    2. Institute of Soil and Water Conservation, CAS and Ministry of Water Resource, Yangling 712100, China;
    3. College of Resources and Environment, Northwest A & F University, Yangling 712100, China
  • Received:2014-05-09 Revised:2014-09-17 Online:2015-06-20 Published:2015-06-20

摘要:

青海省地处高寒区,近几十年来针对这一区域农田生态系统中土壤有机碳(SOC)库变化及其影响因素的研究较少.研究利用第二次土壤普查数据(1982 年),结合近期(2011 年)重复采集的田间土壤样品,以土壤类型为单元,对县域尺度(青海乐都县)农田表层(0~20 cm)SOC库的时空变化特征进行分析.结果表明:① 乐都县1982 年表层有机碳密度(SOCD)为3.8kg·m-2,2011 年降低至2.8 kg·m-2,30 a 间降幅达26%,且呈东北部和南部降低、西北地区增加的趋势;② 乐都县1982 年表层SOC储量1.8×106 t,2011 年1.4×106 t,30 a 间降幅达24%;③ 土壤类型中,草甸土、栗钙土和黑钙土表现为丢碳,速率分别为-137.3、-35.0、-91.0 g C·m-2·a-1,潮土和灰钙土表现为固碳,速率分别为9.7、7.3 g C·m-2·a-1,且30 a 来各土类SOCD变化率与1982 年SOCD呈负线性相关(y=0.35-0.13x).

关键词: 土壤类型, 青海乐都县, SOC, 农田

Abstract:

The change of soil organic carbon (SOC) pool in cropland ecosystem and its effecting factors were little investigated in the alpine area of Qinghai Province in recent decades. Using soil type as the unit, combining the second soil survey data (1982) and the recent (2011) repeatedly collected soil samplings, the spatio-temporal distribution characteristics of SOC pool at the surface layer (0-20 cm) of cropland ecosystem were studied at a county scale in Qinghai Province. The results clearly showed that, in Ledu County, the SOC density (SOCD) at the surface layer of cropland was 3.8 and 2.8 kg ·m- 2 in 1982 and 2011 respectively. At a county scale, SOCD decreased by 26% during the period from 1982 to 2011, however it only decreased in the northeast and south of the county while increased in the northwest of the county. The SOC storage at surface layer of cropland was 1.8×106 t in 1982 and 1.4×106 t in 2011, decreasing by 24% in recent 30 years. In all soil types, meadow soil, chestnut soil and chernozem soil showed carbon losing at the rates of -137.3, -35.0 and -91.0 g C·m-2·a-1 respectively, while fluvo-aquic soil and sierozem soil showed carbon sequestration at the rates of 9.7 and 7.3 g C ·m-2 ·a-1 respectively. Furthermore, the changing rates of SOCD in recent 30 years had a negative linear correlation with the SOCD in 1982 (y=0.35-0.13x).

Key words: cropland, SOC, Ledu County, Qinghai Province, soil types

中图分类号: 

  • S153.6