Article(id=1281692318889653026, tenantId=1146029695717560320, journalId=1281212937352253451, issueId=1281692318004646631, articleNumber=null, orderNo=null, doi=10.12133/j.smartag.SA202508027, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=research-article, receivedDate=1756224000000, receivedDateStr=2025-08-27, revisedDate=null, revisedDateStr=null, acceptedDate=null, acceptedDateStr=null, onlineDate=1783508861514, onlineDateStr=2026-07-08, pubDate=1774800000000, pubDateStr=2026-03-30, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1783508861514, onlineIssueDateStr=2026-07-08, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1783508861514, creator=13701087609, updateTime=1783508861514, updator=13701087609, issue=Issue{id=1281692318004646631, tenantId=1146029695717560320, journalId=1281212937352253451, year='2026', volume='8', issue='2', pageStart='1', pageEnd='278', issueExtLink='null', onlineDate='null', pubDate='1774800000000', pubDateStr='2026-03-30', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=1, specialIssue=null, createTime=1783508861304, creator='13701087609', updateTime=1783509039471, updator='13701087609', preIssue=null, nextIssue=null, articleTotal=null, ext={EN=IssueExt(id=1281693065375101617, tenantId=1146029695717560320, journalId=1281212937352253451, issueId=1281692318004646631, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1281693065375101618, tenantId=1146029695717560320, journalId=1281212937352253451, issueId=1281692318004646631, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null, downloadFileDto=null}, startPage=48, endPage=58, ext={EN=ArticleExt(id=1281692319086785315, articleId=1281692318889653026, tenantId=1146029695717560320, journalId=1281212937352253451, language=EN, title=Optimal Sampling Strategy for Soil Organic Matter Based on Hippopotamus Optimization Algorithm and Machine Learning, columnId=1281692318755427048, journalTitle=Smart Agriculture, columnName=Topic--Multi-source Remote Sensing Driven Digital Agriculture Innovation and Practice, runingTitle=null, highlight=null, articleAbstract=
[Objective] Soil quality is crucial for food security, ecosystem health, and sustainable development, but faces degradation due to intensive land use. Accurate soil quality assessment is therefore essential for informed land management and ecological protection. Machine learning has enhanced digital soil mapping (DSM) by improving modeling accuracy through multi-source data integration. Within DSM, soil sampling design is a foundational step that directly influences prediction accuracy, cost, and efficiency. An ideal scheme must balance mapping precision with economic and operational feasibility. This study focuses on soil organic matter (SOM), a core indicator of soil quality affecting fertility, carbon sequestration, and environmental regulation. Precisely mapping its spatial variability is vital for sustainable soil management. To address the need for efficient sampling, the aim of this research is to develop an optimal sampling design method for regional-scale SOM mapping, reduce sampling redundancy and cost while improving spatial prediction accuracy. [Methods] A sampling optimization framework was proposed that integrated intelligent optimization algorithms with a hybrid spatial interpolation model. The framework was built upon the hippopotamus optimization algorithm (HO) and incorporated the random forest residual kriging (RFRK) method to construct an optimal sampling strategy for the spatial prediction of SOM. At the initialization stage, a population of candidate solutions, referred to as "hippopotamuses", was randomly generated, with each individual representing a potential sampling layout. The HO was employed to select subsets of sampling points from the training sample pool, with each subset forming a candidate solution. Collectively, these solutions constituted the initial hippopotamus population. The study area was located in Lanxi city, Zhejiang province, where a total of 1 080 field-measured soil samples were collected. These samples were partitioned into a training set (n=756), a validation set (n=108), and a test set (n=216) at a ratio of 7:1:2. Environmental covariates, including terrain attributes, vegetation indices, and climate factors, were extracted from multi-source remote sensing datasets. Using these covariates, the HO optimized sampling schemes across varying densities and spatial configurations. The resulting designs were then evaluated using the RFRK model to assess their SOM prediction performance. This process enabled the identification of the optimal sampling density and spatial layout that balanced accuracy and cost-efficiency. [Results and Discussions] When the HO-RFRK framework was applied, the prediction accuracy of SOM improved significantly as sampling density increased from 0.5 to 2.3 points/km2 (136-629 points). The root mean square error (RMSE) on the test set decreased from 6.04 to 5.11 g/kg, representing a reduction of approximately 15.4%. The lowest prediction errors were observed at a sampling density of 2.3 points/km2, with the RMSE and mean absolute error (MAE) reaching their minimum values of 5.11 and 3.79 g/kg, respectively, beyond which further increases yielded only marginal gains, indicating diminishing returns. To assess the effectiveness of HO, its performance was compared with three established methods: conditioned Latin hypercube sampling (cLHS), genetic algorithm (GA), and particle swarm optimization (PSO). At lower densities (0.5-1.3 points/km2), all methods showed limited predictive power. However, at 1.4 points/km2 (383 points), the HO method was the first to exceed predefined accuracy thresholds (coefficient of determination, R2>0.40; Lin's concordance correlation coefficient, LCCC>0.55), achieving R2=0.41 and LCCC=0.57, outperforming cLHS (R²=0.38, LCCC=0.53), GA (R2=0.39, LCCC=0.52), and PSO (R2=0.38, LCCC=0.51). Across the range of 1.4-2.3 points/km2, HO consistently delivered superior results. At 2.3 points/km2, the HO-RFRK combination achieved R2=0.49 and LCCC=0.63, surpassing cLHS, GA, and PSO in both metrics. [Conclusions] Based on the cultivated land of Lanxi city as a test case, a novel sampling optimization strategy was proposed based on the HO. First, the strategy successfully identified an optimal sampling density that maximizes prediction accuracy, as well as a lower, cost-effective density that maintains robust predictive performance with substantially reduced survey costs, defining a practical density range that balances precision and economic feasibility. Second, the RFRK model consistently demonstrated superior prediction accuracy compared to the standard random forest (RF) model across all tested sampling schemes, validating the effectiveness of the integrated HO-RFRK approach. In summary, this optimized strategy achieves high mapping accuracy with greater sampling efficiency, offering a scientifically grounded and practical methodology for reducing long-term soil monitoring costs. It provides a valuable reference for optimizing soil surveys in Lanxi city and other regions with similar environmental settings.
, authors=Zhenxiang LIAN
1, 2, Xufeng FEI
2, Zhouqiao REN
2, authorsList=Zhenxiang LIAN, Xufeng FEI, Zhouqiao REN, authorCompany=null, correspAuthors=Zhouqiao REN, authorNote=
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【目的/意义】 土壤有机质(Soil Organic Matter, SOM)是土壤质量的核心表征指标,开展SOM制图研究具有重要意义。尽管机器学习已成为提升数字土壤制图(Digital Soil Mapping, DSM)精度的重要手段,但其性能依赖于输入采样数据的质量。因此,合理的采样点布局是DSM的关键前提。本研究旨在剔除冗余采样点、降低采样成本,并进一步提升SOM的预测精度。 【方法】 构建基于河马优化算法(Hippopotamus Optimization Algorithm, HO)随机森林残差克里金插值的最优采样策略。以浙江省兰溪市已布设调查的1 080个土壤样点为基础,结合环境协变量,优化生成多组采样方案,确定最优的采样密度和样点位置,用于SOM的空间预测与制图。 【结果和讨论】 HO优化的多组采样方案中,当采样密度为2.3点/km²(629个采样点)时效果最佳,均方根误差和平均绝对误差分别降低至5.11和3.79 g/kg,决定系数为0.49,林氏一致性相关系数达到0.63,优化后采样成本较原始方案下降41.8%。 【结论】 综上所述,兼顾采样成本和预测精度,HO是一种潜在有效的采样优化方法,能为类似区域的土壤有机质空间预测与制图采样提供参考。
, authors=连振翔
1, 2, 费徐峰
2, 任周桥
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1.浙江农林大学数学与计算机科学学院,浙江 杭州 311300,中国
2.浙江省农业科学院数字农业研究所,浙江 杭州 310021,中国, bio={"content":"
连振翔,硕士研究生,研究方向为农林资源大数据与智能决策。E-mail:lianzx2025@163.com
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连振翔,硕士研究生,研究方向为农林资源大数据与智能决策。E-mail:lianzx2025@163.com
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53(8): 275-282., articleTitle=null, refAbstract=null)], funds=[Fund(id=1282336215181529779, tenantId=1146029695717560320, journalId=1281212937352253451, articleId=1281692318889653026, awardId=2023YFD1902900, language=EN, fundingSource=National Key Research and Development Program(2023YFD1902900), fundOrder=null, country=null), Fund(id=1282336215257027252, tenantId=1146029695717560320, journalId=1281212937352253451, articleId=1281692318889653026, awardId=2023YFD1902900, language=CN, fundingSource=国家重点研发计划项目(2023YFD1902900), fundOrder=null, country=null)], companyList=[AuthorCompany(id=1282336207472398971, tenantId=1146029695717560320, journalId=1281212937352253451, articleId=1281692318889653026, xref=1., ext=[AuthorCompanyExt(id=1282336207489176188, tenantId=1146029695717560320, journalId=1281212937352253451, articleId=1281692318889653026, companyId=1282336207472398971, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
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2.浙江省农业科学院数字农业研究所,浙江 杭州 310021,中国)])], figs=[ArticleFig(id=1282336211360518813, tenantId=1146029695717560320, journalId=1281212937352253451, articleId=1281692318889653026, language=EN, label=Fig.1, caption=
An overview of Lanxi city and the spatial distribution of soil sample data, figureFileSmall=e3PNVBrtBPh19EImctVf5Q==, figureFileBig=acu1N+SaWAuUg+/E7rjBHg==, tableContent=null), ArticleFig(id=1282336211444404894, tenantId=1146029695717560320, journalId=1281212937352253451, articleId=1281692318889653026, language=CN, label=图1, caption=
兰溪市概况以及土壤样本数据的空间分布注: 该图基于自然资源部标准地图服务网站下载的审图号为GS(2019)3266号标准地图制作, 底图无修改。
, figureFileSmall=e3PNVBrtBPh19EImctVf5Q==, figureFileBig=acu1N+SaWAuUg+/E7rjBHg==, tableContent=null), ArticleFig(id=1282336211696063135, tenantId=1146029695717560320, journalId=1281212937352253451, articleId=1281692318889653026, language=EN, label=Fig.2, caption=
Technical roadmap for soil sampling optimization based on hippopotamus optimization algorithm and random forest residual kriging (HO-RFRK), figureFileSmall=SVjHuHDDdPFVpcSM7xfM/A==, figureFileBig=t/J+I4J5lC8E7W7eJIMVyw==, tableContent=null), ArticleFig(id=1282336211754783392, tenantId=1146029695717560320, journalId=1281212937352253451, articleId=1281692318889653026, language=CN, label=图2, caption=
基于HO-RFRK的土壤采样优化技术路线图, figureFileSmall=SVjHuHDDdPFVpcSM7xfM/A==, figureFileBig=t/J+I4J5lC8E7W7eJIMVyw==, tableContent=null), ArticleFig(id=1282336211842863777, tenantId=1146029695717560320, journalId=1281212937352253451, articleId=1281692318889653026, language=EN, label=Fig.3, caption=
Flow chart of the hippopotamus optimization (HO) algorithm in soil sampling optimization, figureFileSmall=3wLg+f+z9nu7iWzIXBAX4Q==, figureFileBig=8D/XVr+zA4V0iu0r1qLjBg==, tableContent=null), ArticleFig(id=1282336211914166946, tenantId=1146029695717560320, journalId=1281212937352253451, articleId=1281692318889653026, language=CN, label=图3, caption=
HO土壤采样优化流程图, figureFileSmall=3wLg+f+z9nu7iWzIXBAX4Q==, figureFileBig=8D/XVr+zA4V0iu0r1qLjBg==, tableContent=null), ArticleFig(id=1282336212086133411, tenantId=1146029695717560320, journalId=1281212937352253451, articleId=1281692318889653026, language=EN, label=Fig. 4, caption=
The correlation of feature variables and SOM contents in Lanxi city, figureFileSmall=kFHQpKNLSkJtqk1c+AE/bw==, figureFileBig=GDqi5ARscNe1y8ccF0W2Gw==, tableContent=null), ArticleFig(id=1282336212161630884, tenantId=1146029695717560320, journalId=1281212937352253451, articleId=1281692318889653026, language=CN, label=图4, caption=
兰溪市特征变量与SOM含量的相关性分析注:*表示P < 0.05。
, figureFileSmall=kFHQpKNLSkJtqk1c+AE/bw==, figureFileBig=GDqi5ARscNe1y8ccF0W2Gw==, tableContent=null), ArticleFig(id=1282336212245516965, tenantId=1146029695717560320, journalId=1281212937352253451, articleId=1281692318889653026, language=EN, label=Fig.5, caption=
The importance score of feature variables MDI in Lanxi city, figureFileSmall=Xmk5P+Nx8Ll/5ruepxWxMw==, figureFileBig=CRIWJ3DnpcmQLVUnRflAEw==, tableContent=null), ArticleFig(id=1282336212329403046, tenantId=1146029695717560320, journalId=1281212937352253451, articleId=1281692318889653026, language=CN, label=图5, caption=
兰溪市特征变量MDI重要性得分, figureFileSmall=Xmk5P+Nx8Ll/5ruepxWxMw==, figureFileBig=CRIWJ3DnpcmQLVUnRflAEw==, tableContent=null), ArticleFig(id=1282336212509758119, tenantId=1146029695717560320, journalId=1281212937352253451, articleId=1281692318889653026, language=EN, label=Fig.6, caption=
Convergence process of the objective function during the iterative optimization of hippopotamus optimization algorithm, figureFileSmall=pXhLq7NiZRpfO5JwpShLnQ==, figureFileBig=Lf7KOERZYlevPYNIhuCBFg==, tableContent=null), ArticleFig(id=1282336212614615720, tenantId=1146029695717560320, journalId=1281212937352253451, articleId=1281692318889653026, language=CN, label=图6, caption=
HO迭代优化过程中目标函数的收敛过程注:训练样本数=383。
, figureFileSmall=pXhLq7NiZRpfO5JwpShLnQ==, figureFileBig=Lf7KOERZYlevPYNIhuCBFg==, tableContent=null), ArticleFig(id=1282336212690113193, tenantId=1146029695717560320, journalId=1281212937352253451, articleId=1281692318889653026, language=EN, label=Fig.7, caption=
Performance evaluation and comparison of different optimization algorithms, figureFileSmall=DKUIq3FC45MScSwglLJ4Bw==, figureFileBig=SGrxQBP2wIgo3hdF0MxPng==, tableContent=null), ArticleFig(id=1282336212778193578, tenantId=1146029695717560320, journalId=1281212937352253451, articleId=1281692318889653026, language=CN, label=图7, caption=
不同优化算法性能评估与比较, figureFileSmall=DKUIq3FC45MScSwglLJ4Bw==, figureFileBig=SGrxQBP2wIgo3hdF0MxPng==, tableContent=null), ArticleFig(id=1282336212849496747, tenantId=1146029695717560320, journalId=1281212937352253451, articleId=1281692318889653026, language=EN, label=Fig. 8, caption=
Spatial distribution of soil sampling points under two densities and coefficients of variation for different blocks, figureFileSmall=CRid+U8jWEd8p9mOiPcLVA==, figureFileBig=uRsshBUnap0pL87IFtzJMQ==, tableContent=null), ArticleFig(id=1282336214539801260, tenantId=1146029695717560320, journalId=1281212937352253451, articleId=1281692318889653026, language=CN, label=图8, caption=
两种土壤采样密度的空间位置和不同区块的变异系数注:该图基于自然资源部标准地图服务网站下载的审图号为GS(2019)3266号标准地图制作,底图无修改。
, figureFileSmall=CRid+U8jWEd8p9mOiPcLVA==, figureFileBig=uRsshBUnap0pL87IFtzJMQ==, tableContent=null), ArticleFig(id=1282336214615298733, tenantId=1146029695717560320, journalId=1281212937352253451, articleId=1281692318889653026, language=EN, label=Fig.9, caption=
Mapping results of SOM under different sampling schemes in Lanxi city, figureFileSmall=i1etrIeefDbLX5MENYd8Xw==, figureFileBig=gKItNEmam63Es+JEHhH4ZA==, tableContent=null), ArticleFig(id=1282336214682407598, tenantId=1146029695717560320, journalId=1281212937352253451, articleId=1281692318889653026, language=CN, label=图9, caption=
兰溪市不同采样方案的SOM制图结果注:该图基于自然资源部标准地图服务网站下载的审图号为GS(2019)3266号标准地图制作,底图无修改。
, figureFileSmall=i1etrIeefDbLX5MENYd8Xw==, figureFileBig=gKItNEmam63Es+JEHhH4ZA==, tableContent=null), ArticleFig(id=1282336214766293679, tenantId=1146029695717560320, journalId=1281212937352253451, articleId=1281692318889653026, language=EN, label=Table 1, caption=
Feature variable of soil organic matter (SOM)
, figureFileSmall=null, figureFileBig=null, tableContent=
| 变量类别 | 变量名称 | 原始分辨率/m | 年份 |
|---|
| 土壤因子 | 土壤酸碱度(pH) 全磷(Total Phosphorus, TP) 容重(Bulk Density,BD)、黏粒含量(Clay Content, CLY) 粉粒含量(Silt Content,SLT)、砂粒含量(Sand Content, SND) | 90 | 2010—2018 |
| 盐分指数(Salinity Index 2, SI2) | 30 | 2023 |
| 位置因子 | 经度(Longitude, LON) 纬度(Latitude, LAT) | — | — |
| 地形因子 | 坡向(Aspect,ASP)、坡度(Slope, SLP) 高程(Digital Elevation Model, DEM) 剖面曲率(Profile Curvature,Kv)、水流强度指数(Stream Power Index, SPI) | 30 | 2009 |
| 气象因子 | 年降水量(Precipitation, PRE) 年均气温(Temperature, TEM) 年蒸发量(Evaporation, EVP) 年均地温(Ground Surface Temperature, GST) | 1 000 | 2022 |
多年平均降水量(Mean Annual Precipitation, MAP) 多年平均气温(Mean Annual Temperature, MAT) | 2012—2022 |
| 植被因子 | 归一化植被指数(Normalized Difference Vegetation Index, NDVI) 增强型植被指数(Enhanced Vegetation Index, EVI) 植物总初级生产力(Gross Primary Productivity, GPP) 叶面积指数(Leaf Area Index, LAI) 植物净生产力(Net Primary Productivity, NPP) 总潜在蒸散量(Potential Evapotranspiration, PET) 总蒸散量(Evapotranspiration, ET) 光合有效辐射(Fraction of Photosynthetically Active Radiation, FPAR) | 30 | 2022 |
), ArticleFig(id=1282336214845985456, tenantId=1146029695717560320, journalId=1281212937352253451, articleId=1281692318889653026, language=CN, label=表1, caption=
SOM的特征变量
, figureFileSmall=null, figureFileBig=null, tableContent=
| 变量类别 | 变量名称 | 原始分辨率/m | 年份 |
|---|
| 土壤因子 | 土壤酸碱度(pH) 全磷(Total Phosphorus, TP) 容重(Bulk Density,BD)、黏粒含量(Clay Content, CLY) 粉粒含量(Silt Content,SLT)、砂粒含量(Sand Content, SND) | 90 | 2010—2018 |
| 盐分指数(Salinity Index 2, SI2) | 30 | 2023 |
| 位置因子 | 经度(Longitude, LON) 纬度(Latitude, LAT) | — | — |
| 地形因子 | 坡向(Aspect,ASP)、坡度(Slope, SLP) 高程(Digital Elevation Model, DEM) 剖面曲率(Profile Curvature,Kv)、水流强度指数(Stream Power Index, SPI) | 30 | 2009 |
| 气象因子 | 年降水量(Precipitation, PRE) 年均气温(Temperature, TEM) 年蒸发量(Evaporation, EVP) 年均地温(Ground Surface Temperature, GST) | 1 000 | 2022 |
多年平均降水量(Mean Annual Precipitation, MAP) 多年平均气温(Mean Annual Temperature, MAT) | 2012—2022 |
| 植被因子 | 归一化植被指数(Normalized Difference Vegetation Index, NDVI) 增强型植被指数(Enhanced Vegetation Index, EVI) 植物总初级生产力(Gross Primary Productivity, GPP) 叶面积指数(Leaf Area Index, LAI) 植物净生产力(Net Primary Productivity, NPP) 总潜在蒸散量(Potential Evapotranspiration, PET) 总蒸散量(Evapotranspiration, ET) 光合有效辐射(Fraction of Photosynthetically Active Radiation, FPAR) | 30 | 2022 |
), ArticleFig(id=1282336214938260145, tenantId=1146029695717560320, journalId=1281212937352253451, articleId=1281692318889653026, language=EN, label=Table 2, caption=
Statistical analysis of SOM content in Lanxi city
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| 数据集 | 样本量 | 最大值/(g/kg) | 最小值/(g/kg) | 平均值/(g/kg) | 中位数/(g/kg) | 变异系数CV/% |
|---|
| 全样本 | 1 080 | 47.05 | 3.63 | 23.92 | 24.26 | 30.82 |
| 训练样本池 | 756 | 44.48 | 3.63 | 24.01 | 24.23 | 30.75 |
| 验证集 | 108 | 40.90 | 4.81 | 23.20 | 23.56 | 32.72 |
| 测试集 | 216 | 47.05 | 6.48 | 23.97 | 24.61 | 30.03 |
), ArticleFig(id=1282336215017951922, tenantId=1146029695717560320, journalId=1281212937352253451, articleId=1281692318889653026, language=CN, label=表2, caption=
兰溪市SOM含量统计分析
, figureFileSmall=null, figureFileBig=null, tableContent=
| 数据集 | 样本量 | 最大值/(g/kg) | 最小值/(g/kg) | 平均值/(g/kg) | 中位数/(g/kg) | 变异系数CV/% |
|---|
| 全样本 | 1 080 | 47.05 | 3.63 | 23.92 | 24.26 | 30.82 |
| 训练样本池 | 756 | 44.48 | 3.63 | 24.01 | 24.23 | 30.75 |
| 验证集 | 108 | 40.90 | 4.81 | 23.20 | 23.56 | 32.72 |
| 测试集 | 216 | 47.05 | 6.48 | 23.97 | 24.61 | 30.03 |
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