阿荣旗地形对耕地养分的影响研究

STUDY ON THE INFLUENCE OF TERRAIN ON NUTRIENTS OF CULTIVATED LAND IN ARONG BANNER

耕地是人类赖以生存的基本条件,实现农业的可持续发展首先要保证耕地的数量和质量,耕地资源管理一直都是农业研究的热点。本研究以阿荣旗作为研究区,应用GIS技术和相关性分析,探究了地形对研究区耕地空间分布及养分变异性的影响。结果表明,耕地在高程为200~400 m的范围内分布面积最多,占总面积的87.25%;在缓坡和中等坡的耕地面积占耕地总面积的77.01%,并随着高程和坡度的增加,耕地面积均出现减少的趋势;土壤养分中有机质、碱解氮和速效钾与高程呈极显著性正相关关系,而速效磷与高程呈显著性负相关关系;另外速效钾与坡度呈正相关关系,有机质、碱解氮和速效磷与坡度呈负相关关系。本研究结果可以为研究区合理地利用土地和科学地管理耕地提供理论依据。

Cultivated land is the basic condition for human survival. The quantity and quality of cultivated land must be guaranteed in the sustainable development of agriculture and land resource management has always been a hot topic of agricultural research. In this study, we analyzed the effects of terrain on spatial distribution and nutrient variability of cultivated land in Arong Banner based GIS technology and correlation analysis. The results showed that the area of cultivated land was the largest in the range of 200—400 m elevation, accounting for 87.25% of the total area;besides, the area of cultivated land accounted for 77.01% on gentle and medium slopes;and with the increase of elevation and slope, the area showed a decreasing trend. Organic matter, alkali-hydrolyzed nitrogen and available potassium in soil nutrients had a very significantly positive correlation with elevation, while the significant negative correlation showed between available phosphorus and elevation. In addition, available potassium were positively correlated with slope grade, while organic matter, alkali-hydrolyzed nitrogen and available phosphorus were negatively correlated with slope. These results can provide theoretical basis for the rational use of land and scientific management of cultivated land.