JIANG Jiayu,LIU Rentao,ZHANG Annin.Comparative Analysis of Soil Fractal Dimension and Soil Physical and Chemical Properties Between Caragana korshinskii Shrub Plantations in Arid and Semi-arid Desert Steppe[J].Research of Soil and Water Conservation,2021,28(04):54-61.
干旱与半干旱荒漠草原区柠条灌丛土壤分形维数与理化性质对比分析
- Title:
- Comparative Analysis of Soil Fractal Dimension and Soil Physical and Chemical Properties Between Caragana korshinskii Shrub Plantations in Arid and Semi-arid Desert Steppe
- 文章编号:
- 1005-3409(2021)04-0054-08
- Keywords:
- arid environment; Caragana korshinskii; soil physical and chemical properties; soil fractal dimension; desertified grassland
- 分类号:
- S153;S152.3
- 文献标志码:
- A
- 摘要:
- 为了探讨干旱与半干旱荒漠草原区灌丛微生境土壤分形维数与理化性质变化特征及对干旱环境的响应规律,选择宁夏盐池和内蒙古乌拉特荒漠草原柠条灌丛为研究对象,以灌丛外裸地为对照,采用野外采样与室内分析方法,开展了灌丛内外微生境土壤分形特征和土壤理化性质的对比研究。结果表明:(1)盐池柠条灌丛显著提高了中砂粒含量,降低了土壤黏粒、含水量、pH值、全碳含量及土壤碳氮比。乌拉特柠条灌丛显著提高了极细砂粒和细砂粒含量,降低了土壤黏粒含量和土壤分形维数。(2)从乌拉特到盐池,随着降水量增加,柠条灌丛土壤粉粒、含水量、全碳含量及碳氮比增加,而极细砂粒、细砂粒、pH值降低。(3)土壤黏粒与土壤养分间呈正相关性,土壤粉粒与全碳、碳氮比及含水量间均呈显著正相关性,但极细砂粒与全氮呈显著负相关性,土壤细砂粒与全碳、碳氮比及含水量间呈显著负相关性,土壤中砂粒与土壤含水量、全碳、土壤碳氮比间呈负相关性。(4)土壤分形维数与土壤养分呈正相关,与黏粒含量呈显著正相关,而与极细砂粒、细砂粒含量呈显著负相关。综上,降水分布条件差异导致柠条灌丛内外水分再分配格局、养分空间分布产生较大差异。土壤分形维数可以很好地反映不同荒漠草原类型与不同微生境间土壤性质空间差异性。
- Abstract:
- In order to explore the change characteristics of soil fractal dimension and physical and chemical properties of the shrub micro-habitat in the arid and semi-arid desert steppe area and its response to arid environment, Caragana korshinskii shrub in Yanchi of Ningxia and Urat of Inner Mongolia were selected as the research samples, the bare land was used as a control, field sampling and indoor analysis methods were used to carry out a comparative study of soil fractal characteristics and soil physical and chemical properties of the micro-habitats inside and outside the shrubs. The results showed that:(1)in Yanchi, the content of medium sand significantly increased, but the content of soil clay, moisture, pH value, total carbon, and carbon-to-nitrogen ratio reduced in Caragana korshinskii shrubs; in Urat, the content of very fine sand and fine sand significantly increased, but the content of soil clay and fractal dimension reduced in Caragana korshinskii shrubs;(2)with the increase of precipitation, the silt content, water content, total carbon and carbon-to-nitrogen ratio increased, while the clay content, fine sand particles, and pH value decreased in Caragana korshinskii canopy habitats;(3)there was a positive correlation between soil clay and nutrients, and between soil silt content and total carbon, carbon-to-nitrogen ratio and water content, but there was a negative correlation of content of soil very fine sand with total nitrogen, between soil fine sand content and total carbon, carbon-to-nitrogen ratio and water content, and between soil sand content and water content, total soil carbon, and carbon-to-nitrogen ratio;(4)the fractal dimension of soil had a positive correlation with soil nutrients, a significant positive correlation with clay content, and a significant negative correlation with very fine sand and fine sand content. In summary, it was concluded that the differences in precipitation distribution could lead to variations of soil water redistribution and nutrient spatial distributions between Caragana korshinskii shrub microhabitats. The soil fractal dimension could be the rational reflection of the spatial differences of soil properties between shrub microhabitats in desertified grassland under different rainfall regimes.
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备注/Memo
收稿日期:2020-08-20 修回日期:2020-09-10资助项目:国家自然科学基金(41867005,41661054); 宁夏青年拔尖人才培养工程项目(RQ0010)第一作者:蒋嘉瑜(1997—),女,甘肃天水人,硕士研究生,研究方向为恢复生态学。E-mail:jjy15202695024@163.com通信作者:刘任涛(1980—),男,河南南阳人,研究员,硕士生导师,主要从事恢复生态相关研究与教学工作。E-mail:nxuliu2012@126.com