中国草地学报2025，Vol.47Issue(5)：12-20,9.DOI:10.16742/j.zgcdxb.20240219
阻沙固沙带土壤生态化学计量特征空间异质性及其环境解释
Spatial Heterogeneity of Soil Ecological Stoichiometric Characteristics and Environmental Interpretation in the Sand-Blocking and Fixation Zone
摘要
Abstract
The aim of this article is to explore the feedback of soil nutrients and their ecological stoichi-ometry to sand-blocking and fixation methods,and to clarify their ecological responses to environmental factors in sand-blocking and fixation zone(SBFZ).Research was conducted on five sample plots at a typi-cal SBFZ in the northwest of Minqin oasis along the prevailing wind direction.Plots in shifting dune and farmland were selected as control groups.Surface soil(0～10 cm)was collected to measure the soil organic carbon(SOC),total nitrogen(TN),total phosphorus(TP),total potassium(TK),pH,water content and electrical conductivity for the analysis of soil nutrition content,the characteristics of ecological stoichio-metric ratios,and the contribution of environmental factors.The results showed that the SOC varied sig-nificantly in different sample plots,i.e.19.87 g/kg in the farmland,7.75 g/kg in the SBFZ,and 3.59 g/kg in the shifting dune.Levels of TN and TP contents were relatively low,with 0.09 g/kg and 0.44 g/kg on average,respectively.Except in the shifting dune,the content of TK there was a relatively high mean value of 8.79 g/kg.The mean C∶N ratio(161.23)was significantly higher compared with of China's aver-age,while C∶P(26.56)and N∶P(0.21)were significantly lower than Chinese average.The feature of"nitrogen limitation"was identified in the soil of SBFZ and the mineralization process of organic matter was slow.However,soil exhibited strong capacity of phosphate mineralization and the availability of phospho-rus was high.Principal component analysis showed that water content was the dominant environmental fac-tor affecting SOC,TN,TP,and TK contents,as well as their ecological stoichiometric characteristics,with a contribution rate of 87.1%.The contribution rate of pH was 11.3%,whereas electrical conductiv-ity contributed only 1.6%.In summary,the nutrient and ecological status of sandy soil was improved in the SBFZ.The deficient of water and nitrogen was the primary limiting factors for soil nutrient status in the sand-blocking and fixation zone.关键词
民勤绿洲/阻沙固沙带/土壤养分/生态化学计量Key words
Minqin oasis/Sand-blocking and fixation zone/Soil nutrient/Ecological stoichiometry分类
农业科技引用本文复制引用
刘腾,马瑞,田永胜,张春来..阻沙固沙带土壤生态化学计量特征空间异质性及其环境解释[J].中国草地学报,2025,47(5):12-20,9.基金项目
国家自然科学基金区域创新发展联合基金项目(U21A2001) （U21A2001）
