引用本文:
【打印本页】   【HTML】   【下载PDF全文】   查看/发表评论  【EndNote】   【RefMan】   【BibTex】
←前一篇|后一篇→ 过刊浏览    高级检索
本文已被:浏览 77次   下载 72 本文二维码信息
码上扫一扫!
分享到: 微信 更多
大型喷灌条件下马铃薯田间土壤含水率空间变异特征及合理采样数研究
李涛, 张建丰, 熊思源, 张瑞晞
西安理工大学 水利水电学院, 陕西 西安 710048
摘要:
[目的] 研究马铃薯田间不同深度土壤含水率的空间分布规律及其合理采样数,为大型喷灌条件下精准灌溉制度的制定提供科学依据。[方法] 在约34 hm2的农田中采用固定与随机相结合的方法布设了116个取样点,分别测定了0-20 cm和20-40 cm深度的土壤含水率,采用经典统计学与地统计学相结合的方法,研究喷灌前后马铃薯生长期内土壤含水率的空间分布特征及其合理采样数。[结果] 0-20 cm深度灌溉前和灌溉后的平均土壤含水率的变化范围7.61%~13.79%,20-40 cm深度灌溉前和灌溉后的平均土壤含水率的变化范围为8.71%~16.12%;总体上土壤含水率变异系数变化范围为16.47%~28.55%,均表现为中等程度的变异性,20-40 cm深度的土壤含水率变异程度略高于表层。连续2 a马铃薯各时期土壤含水率总体表现为中等程度的空间相关性,土壤含水率空间变异受随机因素与结构因素共同影响。田间水分总体上呈斑块状分布,灌水后期土壤含水率的分布较灌前更为分散。地统计学得出田间合理采样数为87个。[结论] 在大型喷灌条件下马铃薯田间土壤含水量存在中等程度的空间变异性,并且地统计学与传统统计学两种方法均适用于确定农田平均土壤含水率的最优采样数量。
关键词:  土壤含水率  空间变异  马铃薯  地统计学  合理采样数
DOI:10.13961/j.cnki.stbctb.2020.02.033
分类号:S274.3
基金项目:国家自然科学基金项目"喷灌水肥分布对马铃薯产量和品质空间变异的影响"(51609197);陕西省教育厅重点实验室科研计划项目(16Js084)
Spatial Variation of Soil Moisture Content and Reasonable Sampling Number in Potato Field Under Condition of Sprinkler Irrigation
Li Tao, Zhang Jianfeng, Xiong Siyuan, Zhang Ruixi
College of Water Resource and Hydropower, Xi'an University of Technology, Xi'an, Shaanxi 710048, China
Abstract:
[Objective] The spatial distribution and reasonable sampling of soil moisture content in potato field were studied, in order to provide scientific proof for precision irrigation system under the condition of large sprinkler irrigation.[Methods] A total of 116 sample points was selected in a 34 hm2 farmland by the combination of fixed and random sampling. The soil moisture content of 0-20 cm and 20-40 cm depth was measured respectively. The traditional statistics combined with geostatistics were used to analyze the characteristic of the spatial distribution of soil moisture content and the reasonable sampling number.[Results] The soil water content at 0-20 cm depth before and after irrigation ranged from 7.61% to 13.79%, the soil water content at 20-40 cm depth before and after irrigation was ranged from 8.71% to 16.12%. The overall variation coefficient of soil moisture content was 16.47%~28.55%, showing a moderate variability, and the variation of soil water content at 20-40 cm depth was slightly higher than that of the surface layer. The soil moisture content of potato at different times in successive two years showed a moderate spatial correlation, and the spatial variation of soil moisture content was influenced by random factors and structural factors. The distribution of soil moisture in the field was patchy, and soil mositure in the late irrigation period was more disordered than that before irrigation. According to geostatistics, the number of reasonable sampling in the field was 87.[Conclusion] Under the condition of large-scale sprinkler irrigation, the soil moisture content of potato field shows a moderate variability, and both geostatistics and traditional statistics methods are suitable for determining the optimal sampling number of soil moisture content in the potato field.
Key words:  soil moisture content  spatial variation  potato  geostatistics  reasonable sample number