WEI Zheng,WANG Xiao,SONG Weifeng,et al.Impact of Different Terrain Conditions on Population Structure and Pattern of Caragana Mirophylla in Otindag Sandland[J].Research of Soil and Water Conservation,2016,23(06):102-107,115.
坡位对浑善达克沙地小叶锦鸡儿空间分布影响
- Title:
- Impact of Different Terrain Conditions on Population Structure and Pattern of Caragana Mirophylla in Otindag Sandland
- Keywords:
- spatial pattern; slope position; Caragana mirophylla; Otindag Sandland
- 分类号:
- Q14,Q948
- 摘要:
- 坡位对植物种子散布、繁殖和土壤水、热与营养再分配等生态、水文方面各有差异，不适坡位使其生态功能被破坏，造成水土流失、生物多样性降低等失衡生态结构。分析坡位对植物种群的空间分布格局的影响，有助于认识其潜在的生态学过程、种群的生物学特性及其与环境因子之间的相互关系，为合理规划不同坡位植被类型提供依据，对于荒漠化地区意义重大。采用空间格局分析方法，将浑善达克沙地坡位对小叶锦鸡儿空间分布的影响进行了分析。结果表明：（1）在坡上及平地部位，小叶锦鸡儿种群在小尺度上呈现高度聚集分布，随着尺度增大，聚集强度逐渐减弱，最终表现为随机分布，而在坡中及坡下部位，小叶锦鸡儿种群在小尺度上表现为均匀或随机分布；（2）根据冠幅、株高将小叶锦鸡儿分为大苗、幼苗，从坡上、坡中、坡下到平地，小叶锦鸡儿大苗灌丛沙堆与小叶锦鸡儿幼苗灌丛沙堆均表现为负相关关系，随着尺度增大，这种关系逐渐减弱，最后表现为无关联。
- Abstract:
- Slope position has different effects on the ecohydrological processes, such as seed dispersal, reproduction, soil water dynamics, heat transfer and nutrient redistribution, etc. In appropriate slope position will unbalance the ecological function, such as soil and water loss and decreased biodiversity, researches about the effect of slope position on the spatial pattern of plant population will contribute to understand the potential ecological processes and biological characteristics of plant populations and their relationships with environmental factors, and be helpful to the rational planning of vegetation types of different slope positions in desertification-prone area. Based on the method of spatial pattern we studied the impact of different slope positions on the structure and pattern of Caragana mirophylla in Otindag Sandland. The results showed that:(1) the population of Caragana mirophylla in the upper part of the slope or on the flat part showed high aggregation within the small scale, as the scale increased, the aggregation intensity gradually decreased and finally became random distribution, while in the middle and lower parts of the slope, the population presented uniform or random distribution within the small scale; (2) according to the crown and height, Caragana mirophylla was divided into the adult and the youth, from the upper, the middle and the lower slope parts down to the flat part, the negative correlation between the adult and the youth existed, with the increase of the scale, the relationship between them gradually weakened and finally showed no association.
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备注/Memo
收稿日期:2015-01-21;改回日期:2015-03-12。
基金项目:国家国际科技合作专项“中哈丝绸之路经济带土地退化监测与评价技术合作研究”（2015DFR31130）
作者简介:魏峥(1987-),女,内蒙赤峰翁牛特旗人,硕士研究生,主要从事生态环境工程研究。E-mail:wei-zheng-wo@163.com
通讯作者:宋维峰(1967-),男,甘肃会宁县人,博士,教授,主要从事生态环境工程和森林水文研究。E-mail:songwf85@126.com