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草业学报 ›› 2021, Vol. 30 ›› Issue (10): 41-52.DOI: 10.11686/cyxb2020389

• 研究论文 • 上一篇    下一篇

新疆阿勒泰地区荒漠草地土壤有机碳特征及其环境影响因素分析

刘慧霞1(), 董乙强1,3,4, 崔雨萱1, 刘星宏1, 何盘星1, 孙强2(), 孙宗玖1,3,4()   

  1. 1.新疆农业大学草业学院,新疆 乌鲁木齐 830052
    2.新疆维吾尔自治区草原总站,新疆 乌鲁木齐 830049
    3.新疆草地资源与生态重点实验室,新疆 乌鲁木齐 830052
    4.西部干旱荒漠区草地资源与生态教育部重点实验室,新疆 乌鲁木齐 830052
  • 收稿日期:2020-08-19 修回日期:2020-10-26 出版日期:2021-09-16 发布日期:2021-09-16
  • 通讯作者: 孙强,孙宗玖
  • 作者简介:Corresponding author. E-mail: nmszj@21cn.com
    Corresponding author. E-mail: 549136952@qq.com
    刘慧霞(1995-),女,新疆博乐人,在读硕士。E-mail: 158755032@qq.com
  • 基金资助:
    国家基础资源调查专项(2017FY100200);国家自然科学基金项目(32060408);新疆农业大学研究生科研创新项目(XJAUGRI2021003);新疆维吾尔自治区草原总站项目(XJCYZZ2020003)

Environmental factors influencing soil organic carbon and its characteristics in desert grassland in Altay, Xinjiang

Hui-xia LIU1(), Yi-qiang DONG1,3,4, Yu-xuan CUI1, Xing-hong LIU1, Pan-xing HE1, Qiang SUN2(), Zong-jiu SUN1,3,4()   

  1. 1.College of Grassland Science,Xinjiang Agricultural University,Urumqi 830052,China
    2.Grassland Station of Xinjiang Uygur Autonomous Region,Urumqi 830049,China
    3.Xinjiang Key Laboratory of Grassland Resources and Ecology,Urumqi 830052,China
    4.Key Laboratory of Grassland Resources and Ecology of Western Arid Region,Ministry of Education,Urumqi 830052,China
  • Received:2020-08-19 Revised:2020-10-26 Online:2021-09-16 Published:2021-09-16
  • Contact: Qiang SUN,Zong-jiu SUN

摘要:

为探究新疆阿勒泰地区荒漠草地土壤有机碳空间分布特征,采用路线调查和典型样地布设相结合的方法确定104个样地,对0~5 cm、5~10 cm、10~20 cm土层土壤有机碳含量进行测定,同时运用数量生态学和地统计学方法,揭示荒漠土壤有机碳含量及密度空间变异的影响因素。结果表明:0~20 cm荒漠土壤有机碳含量为0.98~11.80 g·kg-1、平均值为3.79 g·kg-1,土壤有机碳密度为257.57~2904.19 g·m-2、平均值为1057.49 g·m-2;随土层深度的增加,土壤有机碳含量(0~5 cm,5~10 cm,10~20 cm)及土壤有机碳密度(0~10 cm,10~20 cm)呈现降低趋势。高值区均主要集中在富蕴县北部地区,低值区主要分布在哈巴河县、布尔津县和福海县南部地区;在0~20 cm土层中,不同荒漠亚类土壤有机碳含量及密度均表现为土质荒漠>砾砂质荒漠>砾石质荒漠>沙质荒漠,且土质荒漠土壤有机碳含量、有机碳密度分别是沙质荒漠土壤的1.74、1.72倍(P<0.05);从冗余分析结果来看,各环境因子对土壤有机碳的实际解释总量为30.93%,其中植被覆盖度、土石比、根部土壤湿度是引起阿勒泰地区荒漠草地土壤有机碳变化的主导因素。总之,研究结果更新与补充了阿勒泰地区荒漠草地土壤有机碳库数据,初步阐明了有机碳变化的主导因素,为荒漠草地管理和可持续利用及碳预算提供资料支撑。

关键词: 土壤有机碳, 荒漠草地, 阿勒泰地区, 冗余分析, 影响因子

Abstract:

The aim of this research was to explore the spatial distribution characteristics of soil organic carbon in desert grassland in the Altay region of Xinjiang. We investigated 104 sampling plots using a combination of transect surveys and conventional plot layouts in August 2018, and collected soil samples for 0-5 cm, 5-10 cm and 10-20 cm soil depths in the centre of the sample plots. The factors influencing the content and spatial variation of soil organic carbon density were evaluated using quantitative ecology and geostatistics methodologies. It was found that the range for desert soil organic carbon content was 0.98-11.80 g·kg-1 in the 0-20 cm layer, with an average value of 3.79 g·kg-1. The soil organic carbon density was 257.57-2904.19 g·m-2 in 0-20 cm layer, with an average value of 1057.49 g·m-2. With increasing soil depth, the soil organic carbon content (0-5 cm,5-10 cm,10-20 cm) and density (0-10 cm,10-20 cm) decreased. Localities with high soil C values were mainly concentrated in the northern part of Fuyun County, while areas with low soil C were mainly distributed in Habahe County, Burqin County and southern Fuhai County. In different desert subtypes, the content and density of organic carbon ranked: soil desert>gravel sandy desert>gravelly desert>sandy desert. The values for organic carbon content and organic carbon density in soil of the soil desert soil were, respectively 1.74 and 1.72 times those of the sandy desert soil (P<0.05). From the results of redundancy analysis, the proportion of variation in soil organic carbon by various environmental factors was 30.93%, with the leading explanatory factors being vegetation cover, soil∶rock ratio, and soil moisture level in the root zone. This study has updated and expanded the available data on soil organic carbon pools in desert grassland in the Altay area and clarified the leading factors of organic carbon change, and has provided data support for desert grassland management, sustainable utilization and carbon budgeting.

Key words: soil organic carbon, desert grassland, Altay region, redundancy analysis, factors influencing soil C