摘要
为研究典型区域不同耕地利用类型下土壤酸度变化特征及主要影响因素,通过调查采样分析增城区三种耕地利用类型(水田、水浇地和旱地)下土壤的pH、交换性酸、有机质、阳离子交换量、全量养分、速效养分含量及其相互关系。结果表明:83.7%的土壤样品pH低于6.5,其中pH区间为(5.5,6.5]和(4.5,5.5]的样品均占37.8%,低于4.5和高于6.5的样品比例分别为8.1%和16.3%;水田土壤pH最高,其次为水浇地,再次为旱地,平均pH分别为6.02、5.51和4.87。水浇地和旱地土壤交换性氢含量显著高于水田;旱地土壤交换性铝含量最高,其次为水浇地,再次为水田,分别为1.38、0.72、0.31 cmol·kg^(-1)。土壤pH与土壤碳酸钙和全钾含量均呈显著正相关,而与土壤交换性酸、Olsen-P含量呈显著负相关。土壤交换性氢与Olsen-P和有效钾呈显著正相关,而与土壤碳酸钙含量呈显著负相关;土壤交换性铝与土壤阳离子交换量、Olsen-P含量呈显著正相关,与土壤碳酸钙和全钾含量呈显著负相关。研究表明,增城区耕地土壤以弱酸性和酸性为主,且耕地利用类型是影响土壤酸度的主要因素之一,旱地土壤酸度最强,其次为水浇地,再次为水田,但其作用机理还有待进一步研究。
Assessing changes in soil acidity and its potential influencing factors is significant for preventing soil acidification and improving soil quality. Ninety-seven soil samples were collected across Zengcheng District, Guangdong Province, which covered three land use types,i.e., paddy rice field, irrigated land, and dryland. Soil pH, exchangeable acid, organic matter(SOM), cation exchange capacity, calcium carbonate, total and available nutrients were determined, and their inner relationship was analized. The 83.7% and 16.3% of collected soil samples had pH lower or higher than 6.5, respectively;37.8%, 37.8%, and 8.1% of total soil samples were located in the range:5.5<pH≤6.5, 4.5<pH≤5.5, and pH≤4.5, respectively. Under different land uses, the pH following the order:paddy soil(6.02)>irrigable land(5.51)>dry land(4.87). The concentration of soil exchangeable hydrogen was much higher in irrigable land and dry land than that from paddy soil;the concentration of soil exchangeable aluminum was following the order:dry land(1.38 cmol·kg^(-1))>irrigable land(0.72 cmol·kg^(-1))>paddy soil(0.31 cmol·kg^(-1)). Soil pH had positively correlation with soil calcium carbonate and total potassium, and negatively correlation with soil exchangeable acid and Olsen-P;soil exchangeable hydrogen had positively correlation with Olsen-P and available potassium, and negatively correlation with calcium carbonate;soil exchangeable aluminum had positively correlation with cation exchange capacity and Olsen-P, and negatively correlated with calcium carbonate and total potassium. Our study indicated that land use was one of the important factors influencing soil acidity, and dry land and irrigable land had much strong acidity than that from paddy soil, and the mechanism need to be further research.
作者
蔡泽江
余强毅
吴文斌
文石林
CAI Zejiang;YU Qiangyi;WU Wenbin;WEN Shilin(National Engineering Laboratory for Improving Quality of Arable Land,Institute of Agricultural Resources and Regional Planning,Chinese Academy of Agricultural Sciences,Beijing 100081,China;National Field Observation and Research Station of Farmland Ecosystem in Qiyang,Hunan Province/Institute of Agricultural Resources and Regional Planning,Chinese Academy of Agricultural Sciences,Qiyang 426182,China)
出处
《农业资源与环境学报》
CAS
CSCD
北大核心
2021年第6期980-988,共9页
Journal of Agricultural Resources and Environment
基金
国家自然科学基金项目(U1901601)。
关键词
土壤酸化
PH
交换性酸
有机质
碳酸钙
soil acidification
pH
exchangeable acid
soil organic matter
calcium carbonate
