摘要
耕地质量等级监测工作是我国耕地数量、质量和生态并重管护的重要技术依托。本文以河南温县吨粮田为例,选用因素整合分析法有效整合农用地分等和土地质量地球化学评估两项成果,探讨了整合成果在划分耕地质量监测区与监测类型中的应用思路。依据耕地自然禀赋、利用状况、经营水平、环境健康因素和名特优农产品喜嗜典型元素含量及空间分布情况,运用聚类分析法划分出自然质量分区、利用水平分区、收益水平分区和健康质量分区。基于此,运用比较判断和综合制图法,将耕地划分为5个相对同质的监测类型。研究结果表明,5个监测类型的耕地综合质量变化特征大体呈现自然质量逐渐优越,利用水平逐渐增强,收益水平逐渐提高,环境健康质量逐渐变差,评价单元有益元素Si含量逐渐减少,有害重金属元素Cd和Hg含量逐渐增多的趋势。农用地分等和土地质量地球化学评估整合成果在耕地质量监测方面具有应用价值,是对现有监测方法的补充与完善。
Monitoring cultivated land quality is an urgent task in China because of decreasing cultivated land,rapid urbanization and soil pollution. Here,we explore new technical application procedures for monitoring zones and types of cultivated land quality by integrating land quality geochemical assessments and agricultural land classification in Wen County,Henan. We evaluate cultivated land comprehensive quality on the basis of factor integrated analysis;cluster analysis is then used to divide five monitoring types,from point to point,line by line into the surface and point-sphere conjunctively,according to the characteristic of content and spatial distribution of natural,social and environmental health factors. The innovation here is bringing in typical elements to agricultural products. In the five monitoring types we found gradual superiority regarding the grade of natural quality,utilization level,income level and inferiority in grades of environmental health quality. The content trend in beneficial elements(e.g. Si) is reducing while the content trends of heavy mental elements(e.g. Cd,Hg)are increasing. These data are original,necessary,updating,and effective integration results applied to dynamic monitoring zoning of cultivated land quality. Our approach improves current dynamic monitoring methods and provides a scientific basis for studying dynamic monitoring system of cultivated land quality.
出处
《资源科学》
CSSCI
CSCD
北大核心
2015年第1期37-44,共8页
Resources Science
基金
国土资源部公益性行业科研专项课题(编号:201011006-2)
关键词
农用地分等
土地质量地球化学评估
吨粮田
耕地质量监测类型
agricultural land classification
land quality geochemical assessment
Tonnage grain
monitoring types of cultivated land quality
