Mu Ren,Sun Fei,Li Xinle,et al.Distribution and Enrichment Characteristics of Nutrients in Soil of Nitraria tangutorum Nebkhas at Different Succession Stages in the Ulanbuhe Desert[J].Research of Soil and Water Conservation,2024,31(03):195-203.[doi:10.13869/j.cnki.rswc.2024.03.006]
乌兰布和沙漠不同演替阶段白刺灌丛沙堆土壤养分分布与富集特征
- Title:
- Distribution and Enrichment Characteristics of Nutrients in Soil of Nitraria tangutorum Nebkhas at Different Succession Stages in the Ulanbuhe Desert
- 文章编号:
- 1005-3409(2024)03-0195-09
- Keywords:
- desert; Nitraria tangutorum; vegetation succession; soil fertility; fertilizer island effect
- 分类号:
- S793.9
- 文献标志码:
- A
- 摘要:
- [目的]探究乌兰布和沙漠不同演替阶段白刺灌丛沙堆土壤养分垂直分布情况,为该区白刺灌丛稳定发展提供科学依据。[方法]选取不同演替阶段白刺灌丛沙堆作为研究对象。通过前期植被调查,依据白刺灌丛枯死率和盖度将其划分不同演替阶段,分别为发育阶段(枯死率10%～30%,盖度20%～40%)、稳定阶段(枯死率<10%,盖度40%～60%)和衰退阶段(枯死率>50%,盖度<20%),分别选取每个演替阶段3个相对独立的白刺灌丛沙堆,在丘间地、沙堆迎风坡和背风坡进行植被特征调查和土壤养分测定。[结果]随着白刺灌丛演替推进,白刺高度、冠幅长度和宽度呈先升后降趋势,其中,稳定阶段冠幅长度显著高于其他阶段(p<0.05),较发育阶段和衰退阶段分别增加45.50%和50.01%(p<0.05)。背风坡处,发育阶段土壤养分含量随着土层深度增加均呈“降—升—降”趋势,稳定和衰退阶段有机质含量呈下降趋势,40—60 cm达到最小值。迎风坡处,40—60 cm土层土壤有机质和全氮含量随着演替阶段发展在衰退阶段达到最大值,但发育和衰退阶段土壤全氮含量随着土层深度增加在40—60 cm达到最小值,较0—10 cm土层分别低83.33%和80.31%(p<0.05)。不同坡位白刺灌丛沙堆土壤养分均在0—10 cm达到最大值,但总体上白刺灌丛沙堆土壤养分富集作用不明显。[结论]白刺灌丛沙堆土壤养分主要集中在沙堆表层,如何缓解白刺灌丛沙堆活化和土壤养分流失,是白刺灌丛沙堆在干旱环境维持稳定的重要保障。
- Abstract:
- [Objective] The aims of this study are to explore the vertical distribution of soil nutrients in sand dunes of N. tangutorum nebkhas at different successional stages in the Ulanbuhe Desert, and to provide a scientific foundation for the stable growth of N.tangutorum shrubs in the region. [Methods] N. tangutorum nebkhas sand piles at different succession were selected stages as the research objects. Through preliminary vegetation investigation, based on the dead rate and coverage of the N. tangutorum shrub, it was divided into different succession stages, namely the development stage(dead rate 10%～30%, coverage 20%～40%), stable stage(dead rate<10%, coverage 40%～60%), and decline stage(dead rate>50%, coverage<20%). Three relatively independent N. tangutorum nebkhas sand piles were selected for each succession stage. The vegetation characteristics and soil nutrients in the inter dune area and on windward and leeward slopes of sand piles were investigated and determined, respectively. [Results] As the succession of the N. tangutorum shrub progresses, the height, crown length, and width of the N. tangutorum first increased and then decreased. Among them, the crown length in the stable stage was significantly higher than that in other stages(p<0.05), increased by 45.50% and 50.01% compared to the developmental and declining stages, respectively(p<0.05). At the leeward slope, the soil nutrient content during the development stage shows a ‘descending ascending descending' trend with the increase of soil depth, while the organic matter content during the stable and declining stages showed a decreasing trend, reaching the minimum value at 40—60 cm. At the windward slope, the content of soil organic matter and total nitrogen in 40—60 cm soil layer reached the maximum value in the decline stage with the development of the succession stage, but the content of total nitrogen in the development and decline stage reached the minimum value in 40—60 cm soil layer with the increase of the soil depth, which was 83.33% and 80.31% lower than that in 0—10 cm soil layer, respectively(p<0.05). The soil nutrients of the white thorn shrub sand pile at different slope positions reached their maximum values at 0—10 cm, but overall, the nutrient enrichment effect of the N. tangutorum nebkhas sand pile soil was not significant. [Conclusion] This research has shown that the soil nutrients in the N. tangutorum nebkhas sand pile are mainly concentrated on the surface of the sand pile. How to alleviate the activation of the N. tangutorum nebkhas sand pile and soil nutrient loss is an important guarantee for the stability of the N. tangutorum nebkhas sand pile in arid environments.
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备注/Memo
收稿日期:2023-05-26 修回日期:2023-07-07
资助项目:中国林业科学研究院基本科研业务费专项“增雨驱动油蒿入侵白刺沙包的机理研究”(CAFYBB2020MB007)
第一作者:牧仁(1995—),男(蒙古族),内蒙古巴彦淖尔人,硕士,助理工程师,主要从事水土荒漠化治理研究。E-mail:1974447781@qq.com
通信作者:孙非(1984—),男,内蒙古巴彦淖尔人,工程师,主要从事水土荒漠化治理研究。E-mail:nxylxl@126.com