干旱区研究2025，Vol.42Issue(4)：646-657,12.DOI:10.13866/j.azr.2025.04.07
晋西黄土区不同林龄刺槐人工林土壤磷组分特征
Patterns of soil phosphorous fractions across a chronosequence of Robinia pseudoacacia plantations in the loess region of western Shanxi Province
摘要
Abstract
This study examines Robinia pseudoacacia plantations of different stand ages(18,22,26,30,33,and 40 years)in the Caijiachuan watershed of Jixian County,located in the Loess Plateau region of western Shanxi.Using the Hedley phosphorous fractionation method,we investigated the distribution patterns of soil phosphorous fractions(H2O-P,NaHCO3-P,NaOH-P,D.HCl-P,C.HCl-P,and Residual-P)in the 0-100 cm soil layer across different stand ages.This study clarifies how soil phosphorous fractions change with stand age and explores the influence of soil physicochemical properties on these changes.The results showed that the average total phospho-rous content at 0-100 cm soil depth followed this trend:30 a(590.44 mg·kg-1)>26 a(571.68 mg·kg-1)>22 a(527.05 mg·kg-1)>18 a(517.83 mg·kg-1)>33 a(490.71 mg·kg-1)>40 a(464.49 mg·kg-1).The distribution of phos-phorous fractions in the soil followed the order:stable phosphorous>residual phosphorous>moderately active phosphorous>active phosphorous.Each phosphorous fraction initially increased and then decreased with stand age,peaking in the 30-year-old plantation.Additionally,as the soil depth increased,both total phosphorous and phosphorous fractions decreased.Redundancy analysis revealed that soil total nitrogen content and soil pH were the primary factors influencing the phosphorous fraction variations.These findings suggest that in the early stages of afforestation,soil phosphorous fractions gradually accumulate in R.pseudoacacia plantations,peaking at mid-dle stand ages.However,as the stand age increases,phosphorous limitation becomes more pronounced,leading to a gradual decline in phosphorous fractions after maturing.Therefore,from the perspective of phosphorous limi-tation,appropriate phosphorous fertilization at around 30 years of age can effectively mitigate phosphorous defi-ciency in mature R.pseudoacaciaplantations in the Loess Plateau region of western Shanxi Province.关键词
土壤磷组分/森林土壤/刺槐/晋西黄土区Key words
soil phosphorous fractions/forest soil/Robinia pseudoacacia/loess region of western Shanxi Prov-ince引用本文复制引用
陆善洪,毕华兴,赵丹阳,管凝,韩金丹..晋西黄土区不同林龄刺槐人工林土壤磷组分特征[J].干旱区研究,2025,42(4):646-657,12.基金项目
国家重点研发课题(2022YFF1300401) （2022YFF1300401）
