资源科学 ›› 2016, Vol. 38 ›› Issue (11): 2049-2057.doi: 10.18402/resci.2016.11.04
收稿日期:
2016-04-19
修回日期:
2016-08-08
出版日期:
2016-11-16
发布日期:
2016-11-16
作者简介:
作者简介:殷守强,男,河南濮阳人,硕士生,研究方向为土地信息与管理。E-mail:
基金资助:
YIN Shouqiang, WANG Xin, HE Wenlong, MEN Mingxin(), ZHANG Li
Received:
2016-04-19
Revised:
2016-08-08
Online:
2016-11-16
Published:
2016-11-16
摘要:
耕地质量监测是及时掌握耕地质量和产能变化的必要手段,科学合理的抽样方法不仅能保证监测精度,还可以减少监测成本。本文以河北省黄骅市为研究区域,结合区域耕地质量的实际状况,运用6种抽样方法抽取耕地单元作为监测样点,并计算和比较不同抽样均值的最大相对误差和相对抽样精度。结果表明,抽样精度随着样本容量的增加而提升,速度由快变慢。与简单随机抽样相比,在抽样精度方面,系统分层抽样和系统等距抽样的优势极大,并随着样本数量的增加优势扩大;等别分层抽样的优势较大并且平稳;乡镇分层抽样的优势不大。网格分层抽样不但没有优势,反而可能造成精度的损失。不同的抽样方法在满足相同的监测精度时所需的样本量差异显著,合理的抽样方法在满足监测精度的同时,可以明显地减少样本量。本研究有助于选择出最合适的抽样方法,以期为耕地质量监测中不同抽样方法的精度比较提供方法指导。
殷守强, 王鑫, 贺文龙, 门明新, 张利. 耕地质量监测中不同抽样方法的精度比较——以河北省黄骅市为例[J]. 资源科学, 2016, 38(11): 2049-2057.
YIN Shouqiang,WANG Xin,HE Wenlong,MEN Mingxin,ZHANG Li. Comparison of precision among different sampling methods in cultivated land quality monitoring: a case study of Huanghua City in Hebei Province, China[J]. Resources Science, 2016, 38(11): 2049-2057.
表1
5种抽样方法的不同样本容量下抽样均值的最大相对误差"
样本容量 /个 | 简单随机抽样 /% | 系统等距抽样 /% | 等别分层抽样 /% | 乡镇分层抽样 /% | 系统分层抽样 /% |
---|---|---|---|---|---|
20 | 4.90 | 2.20 | 2.25 | 4.48 | 1.09 |
40 | 3.36 | 1.21 | 1.48 | 3.08 | 0.56 |
60 | 2.72 | 0.95 | 1.19 | 2.47 | 0.38 |
80 | 2.34 | 0.60 | 1.04 | 2.17 | 0.25 |
100 | 2.09 | 0.42 | 0.91 | 1.93 | 0.15 |
200 | 1.46 | 0.22 | 0.63 | 1.31 | 0.08 |
300 | 1.19 | 0.17 | 0.51 | 1.06 | 0.06 |
400 | 1.03 | 0.13 | 0.43 | 0.91 | 0.05 |
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