水土保持学报2023，Vol.37Issue(6)：255-261,7.DOI:10.13870/j.cnki.stbcxb.2023.06.032
洱海流域高肥力土壤的碳磷比特征及调控途径
Characteristics of C∶P Ratio in High Fertility Soil in Erhai Lake Basin and Its Regulation Approach
摘要
Abstract
In order to improve the safe and sustainable utilization of phosphorus in high-fertility soil,and explore the C∶P ratio of high-fertility soil.Soil of three typical crop types(grain crop-maize,local characteristic high value economic crop-tobacco and vegetables with high value and high nutrient input)from 27 sample sites in Erhai Lake Basin were selected to analyze the characteristics of soil carbon and phosphorus content and C∶P ratio.The results showed that:(1)The soil organic carbon(SOC)content was 31.91 g/kg,and there were no significant difference in SOC content among the different crop types.(2)The contents of available inorganic phosphorus(NaHCO3 extracted inorganic phosphorus,NaHCO3-Pi)and available organic phosphorus(NaHCO3 extracted organic phosphorus,NaHCO3-Po)were 156.7 mg/kg and 63.43 mg/kg,respectively.There were no significant difference in the contents of available inorganic and organic phosphorus(NaHCO3-Pi/NaHCO3-Po)among the different crop types,and the results were as follows:vegetable field>tobacco field>maiza field.(3)The C∶NaHCO3-Pi ratio and C∶NaHCO3-Po ratio of farmland soil in Erhai Lake Basin were 321.42 and 1138.25,respectively.The C∶NaHCO3-Pi ratio of farmland soil in Erhai Lake Basin was significantly lower than the China and the southwest China.The C∶NaHCO3-Pi ratio of vegetable field was significantly lower than that of maize field.Our results showed that the soil carbon and phosphorus content in Erhai Lake Basin was high,especially the high phosphorus content,leading to a significant decrease in soil C∶P ratio.The C∶P ratio of high input vegetable land was significantly lower than that of maize field,which not only impacted the transformation of phosphorus by soil microorganisms,but also brought about phosphorus pollution.Therefore,the safe and sustainable utilization of phosphorus in high fertility soil can be achieved by regulating the C∶P ratio.Adding materials with high C∶P ratio,such as crop straw,can increase the soil C∶P ratio,increase the immobilization of soil phosphorus by microbes,and store soil phosphorus in microbial phosphorus pool,which can reduce the loss of soil phosphorus to water.关键词
土壤磷固持/微生物量磷/碳磷比/高肥力土壤/洱海流域Key words
soil microbial immobilization/microbial biomass phosphorus/C∶P ratio/high fertility soil/Erhai Lake Basin分类
农业科技引用本文复制引用
李丹丹,彭懿,冯固,张林..洱海流域高肥力土壤的碳磷比特征及调控途径[J].水土保持学报,2023,37(6):255-261,7.基金项目
国家自然科学基金项目(42277112) （42277112）
