荒漠绿洲白刺灌丛沙堆演化过程土壤肥力变异特征  

Variation characteristics of soil fertility in the succession of Nitraria tangutorum nebkhas in desert oasis

作　　者：高镜贺 肖辉杰[1] 刘涛 GAO Jinghe;XIAO Huijie;LIU Tao(School of Soil and Water Conservation,Beijing Forestry University,Beijing 100083,China;Institute of Geographic Sciences and Natural Resources Research,Chinese Academy of Sciences,Beijing 100101,China)

机构地区：[1]北京林业大学水土保持学院,北京100083 [2]中国科学院地理科学与资源研究所,北京100101

出　　处：《应用与环境生物学报》2025年第2期161-171,共11页Chinese Journal of Applied and Environmental Biology

基　　金：国家重点研发计划项目(2023YFF1304204)资助。

摘　　要：为探究不同演化阶段白刺灌丛沙堆土壤养分变异格局、限制及肥力变化特征,采用空间替代时间的研究方法,测定不同演化阶段白刺灌丛沙堆的土壤养分以及化学计量比,并用因子分析法进行土壤肥力评价.结果发现:(1)白刺灌丛沙堆不同演化阶段间土壤全氮(TN)、全磷(TP)、碱解氮(AN)、速效磷(AP)、氮磷比(N/P)、碱解氮/速效磷(AN/AP)存在极显著差异(P <0.001),土壤有机碳(SOC)没有显著差异(P> 0.05);不同土层(0-20 cm、20-40 cm)间土壤养分指标均没有显著差异;演化阶段和土层仅对于AN、AP具有一定的交互作用.(2)与灌丛沙堆的雏形阶段相比,发育阶段的TN和AP、稳定阶段的TP和AP、衰退阶段的AP分别显著降低,另外衰退阶段的TN、AN处于演化最低水平;N/P值在各土层随演化阶段呈现先降低后增高然后降低的变化趋势;AN/AP在各土层呈现出先增高后降低的趋势.(3)灌丛沙堆演化前期主要受到TN的限制,演化中期主要受到TP、AP的限制,而演化后期则受到TN、AN、AP的共同限制.(4)0-20cm土层土壤肥力水平随演化阶段呈现先降低后增高而后又降低的趋势,表现为稳定阶段>雏形阶段>发育阶段>衰退阶段. 20-40 cm土层土壤肥力水平随演化进程呈现依次降低的变化趋势,表现为雏形阶段>发育阶段>稳定阶段>衰退阶段.本研究从“土壤养分、化学计量比、土壤肥力”三位一体的综合视角,揭示了不同演化阶段白刺沙堆主要受氮、磷养分限制而较少受到SOC影响,虽然稳定阶段土壤肥力不断恢复,但其磷限制仍然不可忽视等重要变异特征,结果可为荒漠生态系统管理提供重要的理论参考.(图5表4参44)The variation patterns,limitations,and characteristics of soil fertility changes in Nitraria tangutorum nebkhas at different successional stages remain unknown.This study adopted a space-for-time approach to evaluate soil fertility based on soil nutrients and stoichiometric ratios at different successional stages.Factor analysis was used to assess the soil fertility.The results showed that:(1)Extremely signiffcant differences(P<0.001)were present in total nitrogen(TN),total phosphorus(TP),alkali-hydrolyzable nitrogen(AN),available phosphorus(AP),nitrogen to phosphorus ratio(N/P),and alkali-hydrolyzable nitrogen to available phosphorus ratio(AN/AP)among different successional stages,while no signiffcant difference(P>0.05)was observed in soil organic carbon(SOC).In addition,no signiffcant differences were observed in soil nutrient indices between different soil layers(0-20 cm and 20-40 cm);however,a certain interaction was present between soil depth and successional stage for AN and AP.(2)Compared with the initial stage,TN and AP in the developing stage,TP and AP in the stable stage,and AP in the declining stage were signiffcantly reduced.Additionally,TN and AN in the declining stage were at the lowest level of succession and the N/P values showed a decreasingincreasing-decreasing trend in different soil layers along the succession stages,while AN/AP showed a trend of ffrst increasing and then decreasing in different soil layers.(3)The early stage of succession was mainly limited by TN,the middle stage of succession was mainly limited by TP and AP,and the late stage of succession was simultaneously limited by TN,AN,and AP.(4)The soil fertility level in the 0-20 cm soil layer initially decreased,then increased,and ffnally decreased over the successional stages.In this layer,the soil fertility levels from highest to lowest were as follows:stable stage>initial stage>developing stage>declining stage.The 20-40 cm soil layer exhibited a decreasing trend over successional stages.In this layer,the soil fertility levels fro

关 键 词：白刺 演化 化学计量比 因子分析法 

分 类 号：S153[农业科学—土壤学]