干旱区研究2025，Vol.42Issue(7)：1236-1245,10.DOI:10.13866/j.azr.2025.07.07
古尔班通古特沙漠不同坡位地衣结皮土壤磷组分分布特征
Distribution of soil phosphorus fractions in lichen crusts at different slope positions in Gurbantunggut Desert
摘要
Abstract
As the fundamental terrain of deserts,sand ridges play a crucial role in shaping the surface water and thermal environment at different slope positions,which profoundly influences how biological soil crusts develop and their spatial distribution patterns.Lichen crusts are widely distributed on the desert surface.However,issues such as how lichen crusts at different slope positions affect the soil phosphorous cycle and what factors play key roles in influencing this remain unclear.Against this background,this study was conducted in Gurbantunggut Des-ert,involving a systematic analysis of the changes in phosphorus fractions and related enzyme activities in the li-chen crust and 0-5 cm soil layer beneath the crust at different slope positions.The results showed that stable phos-phorus in the soil(HCl-Pi,HHCl-Po,HHCl-Pi,and Residual-P)accounted for over 75%of the total phospho-rus(TP)content,followed by medium labile phosphorus(NaOH-Pi and NaOH-Po)and labile phosphorus(Res-in-P,NaHCO3-Pi,and NaHCO3-Po).The slope position had a significant impact on stable phosphorus,and the soil layer had a significant impact on medium labile phosphorus(P<0.05).The data on the contents of stable phos-phorus,TP,organic phosphorus(Po),and inorganic phosphorus(Pi)all revealed that,in the crust layer,the values at the bottom of the slope were significantly higher than those on the east and west slopes,while in the 0-5 cm soil layer,the values on the west slope were significantly lower than those at the bottom of the slope and on the east slope(P<0.05).However,the content of NaOH-Pi was significantly higher on the east and west slopes than at the bottom of the slope in the crust layer,and it was significantly higher on the west slope than on the east slope and at the bottom of the slope in the 0-5 cm soil layer.In terms of soil enzymes,the east slope exhibited the lowest ac-tivity of alkaline phosphatase activity(ALP)and β-glucosidase activity(GC)in the crust layer,but the highest in the 0-5 cm soil layer.Random forest model analysis showed that the changes in moisture and temperature brought about by the slope position were the most important factors affecting the levels of labile phosphorus and stable phosphorus in the crust soil,respectively.This provides scientific support that enriches the theoretical framework of soil phosphorous cycling in desert ecosystems.关键词
生物土壤结皮/地衣结皮/磷循环/温带荒漠/坡位/古尔班通古特沙漠Key words
biological soil crusts/lichen crusts/phosphorus cycling/temperate deserts/slope position/Gurban-tunggut Desert引用本文复制引用
杨孜悦,尹本丰,张署军,黄韵杰,杨傲,张元明,高英志,井长青..古尔班通古特沙漠不同坡位地衣结皮土壤磷组分分布特征[J].干旱区研究,2025,42(7):1236-1245,10.基金项目
新疆维吾尔自治区天山英才领军(2022TSYCLJ0058) （2022TSYCLJ0058）
新疆维吾尔自治区自然科学基金项目(2022D01D83) （2022D01D83）
新疆维吾尔自治区自然科学基金面上项目(2022D01A349) （2022D01A349）
新疆维吾尔自治区天池英才 （）
