摘要
土壤异质性是导致植物空间异质性分布以及土壤动物和啮齿动物栖息地选择的主要因素之一。选择合理的土壤取样点数量和分布对反映研究区土壤信息尤为重要。本研究以祁连山东段高寒草甸土壤为例,以土壤紧实度、容重和水分为调查指标,在110 m×110 m的样地中,以每个样点相互间隔10 m设置了121个取样点,运用地统计学和经典统计学方法,比较不同取样数量(3～36个)和3种取样方法(随机法、网格法和对角线法)与整体取样(121个样点)所获得的结果。研究发现:(1)土壤物理性状的取样误差均随着取样数量的增加而呈下降趋势;(2)最优的取样方法是随机法,且取样数量大于18个,即能达到最小误差以及满足90%和95%置信水平的取样精度。建议研究者根据研究目的和草地类型,关注草地取样方法对研究结果的影响。
Soil heterogeneity is one of the major factors that influence vegetation heterogeneity and habitat selection of soil fauna and rodents. Rational soil sample size and distribution is very important for reflecting the useful information of soil. In this study, we investigated soil compac- tion, soil bulk density, and soil moisture in alpine meadow of the eastern Qilian Mountain, by setting up 121 sampling points within a 110 m x 110 m plot. We compared the results of different sampling sizes （3- 36 sampling points） and three sampling methods （random sampling, grid sampling, and diagonal sampling） with entire sampling method （ 121 sampling points）. We found that ： （ 1 ） The standard errors of sampling decreased with increasing the sampling sizes using different sampling methods. （2） Among the three sampling methods, the random sampling method was the best one. Sampling size of 〉 18 points could meet accuracy requirement under 90% and 95% confidence level. We suggest that the sampling effects should be considered according to the study purpose and grassland type.
作者
楚彬
张振粉
周建伟
王婷
花立民
CHU Bin;ZHANG Zhen-fen;ZHOU Jian-wei;WANG Ting;HUA Li-min(College of Rangeland Science of Gansu Agriculture University,Lanzhou 730070,China)
出处
《生态学杂志》
CAS
CSCD
北大核心
2018年第11期3487-3492,共6页
Chinese Journal of Ecology
基金
国家重点研发计划项目(2017YFC0504803
2016YFC0501902)
甘肃省高校协同创新科技团队支持计划项目资助
