干旱区研究 ›› 2022, Vol. 39 ›› Issue (3): 933-942.doi: 10.13866/j.azr.2022.03.27

• 土壤与生态 • 上一篇    下一篇

红砂灌丛沙堆土壤粒度组成及养分积累特征

李小乐1(),魏亚娟1,党晓宏1,2(),戴玉芝3,翟波1,迟旭1,吴惠敏1   

  1. 1.内蒙古农业大学沙漠治理学院,内蒙古 呼和浩特 010018
    2.内蒙古杭锦荒漠生态系统国家定位观测研究站,内蒙古 鄂尔多斯 017400
    3.呼和浩特气象站,内蒙古 呼和浩特 010018
  • 收稿日期:2021-09-04 修回日期:2021-12-12 出版日期:2022-05-15 发布日期:2022-05-30
  • 通讯作者: 党晓宏
  • 作者简介:李小乐(1998-),男,硕士研究生,主要从事荒漠化防治研究. E-mail: lixiaole0107@126.com
  • 基金资助:
    国家自然科学基金“荒漠灌丛空间构型对其肥岛发育的作用机制”(41967009);内蒙古自治区研究生科研创新项目“荒漠灌丛不定根系构型与其肥岛发育的互馈机制”(S20210211Z)

Soil mechanical composition and soil nutrient content of Reaumuria soongorica nebkhas

LI Xiaole1(),WEI Yajuan1,DANG Xiaohong1,2(),DAI Yuzhi3,ZHAI Bo1,CHI Xu1,WU Huimin1   

  1. 1. College of Desert Management, Inner Mongolia Agricultural University, Hohhot 010018, Inner Mongolia, China
    2. Hangjin National Positioning Observation and Research Station of Desert Ecosystem, Ordos 017400, Inner Mongolia, China
    3. Hohhot Weather Station, Hohhot 010018, Inner Mongolia, China
  • Received:2021-09-04 Revised:2021-12-12 Online:2022-05-15 Published:2022-05-30
  • Contact: Xiaohong DANG

摘要:

为探究荒漠灌丛对其沙堆土壤结构和养分空间异质性的影响,以白音恩格尔自然保护区的优势种红砂(Reaumuria soongorica)灌丛沙堆为研究对象,对其土壤粒度组成及土壤养分积累特征进行分析。结果表明:(1) 研究区土壤粒径组成以细砂为主,含量为36.34%~65.31%,黏粒、粉粒含量均小于7.00%;(2) 红砂灌丛沙堆沉积物趋于细化,由背风侧、迎风侧到沙堆间空地土壤颗粒分选性依次变差,峰态逐渐宽平,分形维数逐渐变小,灌丛沙堆土壤粒径组成含量分布较丘间空地更对称;(3) 灌丛沙堆迎风侧和背风侧有机质(SOM)、碱解氮(AN)、速效磷(AP)、速效钾(AK)含量分别较沙堆间空地增加29.37%和40.63%、23.49%和35.12%、62.72%和66.45%、30.10%和22.75%(P<0.05),且相对作用强度(Relative Interaction Intense, RII),即RII>0。红砂灌丛起到防风滞沙和重新分选沙粒的作用,并且在丛间地风蚀和植物反馈作用下养分向灌丛沙堆富集,形成“肥岛”效应。

关键词: 红砂, 灌丛沙堆, 土壤粒度, 养分积累

Abstract:

Understanding the effects of desert shrubs on the soil structure and nutrient spatial heterogeneity of nebkhas is important for maintaining the stability of desert ecosystems and preventing regional desertification. In this study, soil grain-size composition and soil nutrient accumulation of Reaumuria soongorica in the steppe desert transition zone of Baiyinengel Nature Reserve, Hangjin Banner, Ordos City, were analyzed. (1) The soil was mainly fine sand (content ranging from 36.34% to 65.31%); the clay and silt content was less than 7.00%. (2) Reaumuria soongorica protects nebkhas from wind erosion and also plays a role in fixing quicksand. The sediment of nebkhas tended to be refined, and particle sorting became successively worse from the leeward side to the windward side and the open space between nebkhas. The particle distribution peak became wider and flatter, and the fractal dimension became smaller. The distribution of soil particle size composition in the shrub nebkha was more symmetrical than that in the open space between the mounds. (3) The soil organic matter (SOM), alkaline hydrolyzed nitrogen (AN), available phosphorus (AP), and available potassium (AK) contents on the windward and leeward sides of the nebkha increased by 29.37% and 40.63%, 23.49% and 35.12%, 62.72% and 66.45%, 30.10% and 22.75% (P<0.05), respectively, and RII (Relative Interaction Intense) > 0. Under the influence of wind erosion and plant feedback, nutrients were enriched in nebkhas, forming “fertile islands. ”

Key words: Reaumuria soongorica, nebkhas, soil mechanical composition, soil nutrient content