黑龙江省兴凯湖平原土壤pH值时空变化特征分析

土壤酸碱度是影响土壤化学和生物学性质的一个重要因素，会对土地生产力产生重要影响.为掌握兴凯湖平原土壤pH值近年来变化状况，采用空间统计方法，基于全国第二次土壤普查及2019年土壤pH值数据，对工作区近30年土壤pH值时空变化特征进行了分析.结果表明：兴凯湖平原土壤pH值总体呈下降趋势，但整体上土壤pH值变幅不大，主要集中在±0.5～±1区间.从土地利用类型上来看，兴凯湖平原耕地区土壤pH值均呈下降趋势，西部的林地区pH值整体保持不变或略有上升.在兴凯湖平原4种主要土壤类型中，除暗棕壤外，其他3类土壤在近30年间pH平均值均呈下降趋势.因此需要对工作区土壤pH值变化的原因进行多因素、定量分析，以进一步明确具体原因.

ANALYSIS ON THE SPATIOTEMPORAL VARIATION OF SOIL pH IN XINGKAI LAKE PLAIN,HEILONGJIANG PROVINCE

Soil pH is an important factor affecting the chemical and biological properties of soil. It also has an important impact on land productivity. To learn about the variation of soil pH in Xingkai Lake Plain in recent years, on the basis of the second national soil survey and soil pH data of 2019, the spatial statistics is used to analyze the spatiotemporal variation characteristics of soil pH in the study area over the past 30 years. The results show that the soil pH is generally declining, but does not vary greatly(±0.5 to ±1). In terms of land use types, the soil pH of cultivated land show a downward trend, while that in the western forest area remains unchanged or increases slightly. Among the 4 main soil types in Xingkai Lake Plain, except for dark brown soil, the other three are all falling in average pH values during the past 30 years. Therefore, it is necessary to conduct multi-factor and quantitative analysis to further clarify the specific causes of soil pH variation in the study area.