晋西黄土区不同植被恢复阶段土壤生态化学计量特征  

Ecological stoichiometric characteristics of soil in different vegetation restoration stages in loess region of western Shanxi Province

作　　者：高连炜 张红丽 查同刚[1] Gao Lianwei;Zhang Hongli;Zha Tonggang(School of Soil and Water Conservation,Beijing Forestry University,Beijing 100083,China;Soil and Water Conservation Monitoring Center,Ministry of Water Resources,Beijing 100000,China)

机构地区：[1]北京林业大学水土保持学院,北京100083 [2]水利部水土保持监测中心,北京100000

出　　处：《水土保持研究》2025年第1期30-38,47,共10页Research of Soil and Water Conservation

基　　金：国家自然科学基金项目(32271967);“十四五”重点研发项目(2022YFF1302501)。

摘　　要：[目的]开展土壤生态化学计量特征随植被恢复进程的变化研究,探究植被恢复引起土壤养分变化规律及其作用机制,对认识植被恢复与土壤养分的关系,指导植被恢复实践具有重要意义。[方法]以晋西黄土区不同植被恢复阶段(撂荒地、草地、灌木林、先锋阔叶林、针叶林)的5种林(草)地为研究对象,通过调查采样和室内分析,探究土壤生态化学计量特征随植被恢复的进程变化及其影响因素。[结果](1)随着植被的恢复,先锋阔叶林和针叶林阶段的SOC含量较上一阶段增加19.8%,土壤TN含量较上一阶段增加17.6%,而土壤TP含量较上一阶段减少12.4%;(2)随着植被恢复的发展,土壤C∶P和N∶P显著增加,C∶N的变化无明显规律,在先锋阔叶林和针叶林阶段的土壤C∶P较上一阶段增加26.6%;先锋阔叶林和针叶林阶段在0-40 cm土层的土壤N∶P较上一阶段增加40.2%,40-100 cm土层的土壤N∶P较上一阶段增加35.7%;土壤C∶N在不同植被恢复阶段间的变化未见明显规律,研究区土壤逐渐由C,N的限制转变为P的限制;(3)各植被恢复阶段土壤C∶P和N∶P主要与砂粒含量呈显著负相关,与孔隙度呈显著正相关,土壤C∶N与其他因子的相关性不明显。[结论]植被恢复有利于土壤C,N含量增加,改善土壤理化性质,在植被恢复过程应同时注重P元素的调控,以提高晋西黄土区植被生态恢复水平。[Objective]Vegetation restoration can change the ecological stoichiometric characteristics of soil in a certain degree.Investigating soil stoichiometry changes during vegetation restoration is crucial for understanding the dynamics of soil nutrients and their underlying mechanisms.The aims of this research were to help elucidate the relationship between vegetation restoration and soil nutrient levels,and to provide valuable insights for practical applications in ecosystem restoration.[Methods]Five types of forest(grass)land at different stages of vegetation restoration in the loess region of western Shanxi Province:abandoned farmland,grassland,shrubland,pioneer arbor forest,and coniferous forest were examined.Through field surveys,sampling and laboratory analysis,the changes of soil ecological stoichiometric characteristics with the process of vegetation restoration and its influencing factors were investigated.[Results](1)With vegetation restoration,the SOC content of pioneer arbor forest and coniferous forest stage increased by 19.8%,soil TN content increased by 17.6%and soil TP content decreased by 12.4%compared with the previous stages.(2)With the development of vegetation restoration,the soil C∶P and N∶P increased significantly,and there was no obvious regularity of the changes of C∶N in pioneer arbor forest and coniferous forest stage.Soil C∶P increased by 26.6%compared with the previous stages,Soil N∶P in the 0-40 cm soil layer in the pioneer arbor forest and coniferous forest stage increased by 40.2%compared with the previous stages.Soil N∶P in the 40-100 cm soil layer increased by 35.7%compared with the previous stages,No obvious pattern was seen in the changes of soil C∶N among different vegetation restoration stages.The soil in the study area gradually changed from C and N limitation to P limitation.(3)Soil C∶P and N∶P in each vegetation restoration stage mainly showed significant negative correlation with sand content and significant positive correlation with porosity,and the correla

关 键 词：植被恢复 土壤养分 生态化学计量特征 

分 类 号：S714.2[农业科学—林学]