Purpose

At the intersection of land and sea, coastal zones are unstable areas that can suffer intensive coastal erosion or sedimentation. The Yellow River Delta, which has experienced rapid land growth, is of great significance in soil fertility research.

Materials and methods

To qualitatively and quantitatively analyse the basic soil fertility characteristics of coastal zones, we sampled six soil chemical indicators obtained from the Yellow River Delta in July 2019. Principal component analysis (PCA) and the Nemoro quality index (NQI) were integrated for the geostatistical analysis of soil fertility by using the ArcGIS and SPSS software.

Results and discussion

The NQI, modified NQI (mNQI) and PCA results significantly represented soil fertility, and the mNQI performed better than the NQI. The soil fertility met the classification of ‘III, generally fertile’. The main factors affecting soil fertility were total potassium, total nitrogen and organic matter. The soil fertility indexes declined consistently from west to east. Increasing distance from the sea significantly negatively affected soil fertility, while soil fertility positively impacted land productivity.

Conclusions

Therefore, future agricultural planning should focus on soil total nitrogen, total potassium and organic matter and control salinization to improve land productivity. The eastern coastal zone, especially the south-eastern region, should be the first area of focus.

中文翻译：

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沿海地区土壤肥力的空间异质性-以黄河三角洲为例

目的

在陆地和海洋的交汇处，沿海地区是不稳定的地区，可能遭受严重的海岸侵蚀或沉积。土地快速增长的黄河三角洲在土壤肥力研究中具有重要意义。

材料和方法

为了定性和定量分析沿海地区的基本土壤肥力特征，我们于2019年7月对从黄河三角洲获得的六个土壤化学指标进行了采样。将主成分分析（PCA）和Nemoro质量指数（NQI）进行了地统计学分析使用ArcGIS和SPSS软件分析土壤肥力。

结果和讨论

NQI，改良NQI（mNQI）和PCA结果显着代表了土壤肥力，并且mNQI的表现优于NQI。土壤肥力达到“ III，一般肥沃”的等级。影响土壤肥力的主要因素是总钾，总氮和有机质。土壤肥力指数从西向东持续下降。离海距离的增加对土壤肥力产生了负面影响，而土壤肥力对土地生产力产生了积极影响。

结论

因此，未来的农业规划应将重点放在土壤总氮，总钾和有机质上，并控制盐碱化，以提高土地生产力。东部沿海地区，尤其是东南地区，应该是第一个重点领域。