摘要
为了揭示土壤有机碳(SOC)与土壤盐分和pH在空间和数量上的变化规律,本研究于2019—2020年选择宁夏贺兰山东麓玉米农田生态系统为试验区,通过棋盘式布点法确定样点位置,采用普通克里金插值法和经典统计学方法,分析贺兰山东麓农田SOC与土壤盐碱化空间分布特征及响应规律。研究表明:试验区SOC在空间分布上呈现出中东部高四周低的特点;土壤全盐和Ca^(2+)、Mg^(2+)、Na^(+)、SO_(4)^(2-)、Cl^(-)等盐分离子的空间分布规律存在一定的相似性,即沿试验区中心呈南北对称分布,高值区大致分布在南北对角线两侧;土壤pH呈条带状分布,具有中间高四周低的分布特点。试验区土壤pH范围在8.47~9.44之间,总体呈碱性,CO_(3)^(2-)和HCO_(3)^(-)是该区域土壤发生碱化的主导因子。随着SOC含量的增加,土壤全盐、土壤pH和Ca^(2+)、Mg^(2+)、K^(+)、Na^(+)、SO_(4)^(2-)、CO_(3)^(2-)、Cl^(-)含量呈现先波动增大后减小的趋势。当SOC含量为1.00~6.00 g·kg^(-1)时,SOC与pH、全盐呈显著正相关。研究表明,当SOC含量大于6.00 g·kg^(-1)时,有利于改善土壤盐碱化问题。
This study was conducted to reveal the spatial and quantitative changes in soil organic carbon(SOC)using soil salinity and pH.We selected the maize farmland ecosystem at the eastern foot of Helan Mountain in Ningxia as the experimental area and used the stationing method to determine the location of sample points from 2019 to 2020.Using the Ordinary Kriging and classical statistical methods,we analyzed the spatial distribution characteristics of SOC and soil salination in the eastern foot of Helan Mountain.The results showed that the spatial distribution of SOC was higher in the east and lower in the surrounding areas;whereas the spatial distribution patterns of total salt,Ca^(2+),Mg^(2+),Na^(+),SO_(4)^(2-)and Cl^(-)were similar,that is,they were symmetrically distributed along the center of the experimental area,and the high value area was roughly distributed on both sides of the north–south diagonal.The soil pH was distributed in strips,with a distribution characterized by a high center and low surrounding areas.The soil pH values in the experimental area ranged from 8.47 to 9.44,and was generally alkaline.CO_(3)^(2-)and HCO_(3)^(-) were the dominant factors affecting soil alkalization in this region.With an increase in SOC content,the total salt content,soil pH,Ca^(2+),Mg^(2+),K^(+),Na^(+),SO_(4)^(2-),CO_(3)^(2-),and Cl^(-)showed a fluctuating trend.When the SOC content was between 1.00–6.00 g·kg^(-1),there was a significant positive correlation between the organic carbon and pH.When the SOC content was more than 6.00 g·kg^(-1),it was beneficial to improve soil salinization.
作者
李秀静
肖国举
郭占强
王静
LI Xiujing;XIAO Guoju;GUO Zhanqiang;WANG Jing(School of Geography and Planning,Ningxia University,Yinchuan 750021,China;School of Ecology and Environment,Ningxia University,Yinchuan 750021,China)
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2023年第3期612-623,共12页
Journal of Agro-Environment Science
基金
宁夏科技创新领军人才计划项目(KJT2016006)
国家自然科学基金项目(41665009)。
关键词
盐碱土壤
碳循环
土壤有机碳
盐碱化特征
空间分布
saline soil
carbon cycle
soil organic carbon
salinization characteristics
spatial distribution
