LIU Shujuan,LIU Shizeng,YUAN Hongbo,et al.Effect of Water Formation on the Vegetation and Soil Particle Fractal Dimension in Qingtu Lake in the Tail-Stream of Shiyang River[J].Research of Soil and Water Conservation,2015,22(06):83-88.
石羊河尾闾-青土湖水面形成对土壤分形维数和植被的影响
- Title:
- Effect of Water Formation on the Vegetation and Soil Particle Fractal Dimension in Qingtu Lake in the Tail-Stream of Shiyang River
- Keywords:
- soil fractal dimension; Qingtu Lake; water formation; plant diversity
- 分类号:
- S714.2
- 摘要:
- 以石羊河尾闾青土湖水面形成区的土壤及植被为研究对象，利用植被及土壤调查取样方法，调查分析了水平距水面0～450 m，垂直0—60 cm土层的土壤粒径及植物多样性。利用分形几何学方法对土壤颗粒的分形特征进行分析，以探讨土壤颗粒分形维数与植被特征间的关系。研究结果表明：不同土层及不同水面距离的土壤分形维数在2.10～2.92，平均值为2.55；呈现随距水面距离增大而波动变小的趋势，0—20 cm土层在0~150 m土壤粒径分形维数呈缓慢增加趋势，在150 m处达到最大，随后逐渐降低；而20—40 cm，40—60 cm土层在0~100 m呈缓慢增加趋势，在100 m处达到最大；植物物种多样性变化与土壤分维数的变化具有较好的对应关系；各多样性指数随水面距离变化趋势一致，在距水面0~50 m和400~450 m处多样性达到最大。草本的重要值在距水面200 m处达到最大，灌木的重要值在距水面300 m处达到最大值，草本植物对区域植物多样性影响较大，但灌木植物重要值与土壤特征的变化关系更密切；线性回归分析表明在0—20 cm，40—60 cm土层，分形维数与多样性、均匀度和优势度指数呈显著负相关，在干旱沙漠地区，土壤颗粒分形维数也可作为一个反映评价土壤演变程度的综合定量指标。
- Abstract:
- Soil and vegetation in water formation in the Tail-streams of Shiyang River—Qingtu Lake were selected as the research object. The plant diversity and soil particle sizes in 0—60 cm soil layers which are 0~450 m away from the water body were analyzed. Using fractal geometry method, fractal characteristics of soil particles were analyzed for the purpose of investigating the relationship between the soil particle fractal dimension and vegetation character. The results showed that in different soil layers and different distances from water body, the fractal dimension ranged from 2.105 7 to 2.918 5, with the average of 2.548; fractal dimension of 0—20 cm soil layer presented slowly increasing trend in the distance range of 0~150 m and reached the maximum at the distance of 150 m, and then decreased; and it showed the slow upward trend in 20—40 cm, 40—60 cm soil layer, and reached a maximum at the distance of 100 m; the trends of the diversity index, evenness and dominance were consistent with the change of distance form the water body; they increased in the 0～50 m away from the water body; the diversity index was the highest in the distance od 400～450 m. The value of the important index of the herb reached the maximum at the distance of 200 m away from the water; the important value of shrub reached a maximum at the distance of about 300 m away from the water body. Linear regression analysis showed that in the 0—20 cm and 40—60 cm soil layers, the fractal dimension, diversity index, evenness and dominance showed the significant negative correlation.
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备注/Memo
收稿日期:2014-12-09;改回日期:2015-03-09。
基金项目:国家自然科学基金项目（31160116，31260129，31160264）
作者简介:刘淑娟,(1979-),女,湖南衡阳人,副研究员,硕士,研究方向:荒漠化防治。E-mail:crisbe1210@163.com