毛乌素沙地典型人工植被根际土壤磷形态特征  

Phosphorus Speciation Characteristics of Typical Artificial Vegetation Rhizosphere Soil in Mu Us Sandy Land

作　　者：韩超群 王娇 赵春雷 邵明安[1,2] HAN Chaoqun;WANG Jiao;ZHAO Chunlei;SHAO Ming’an(College of Natural Resources and Environment,Northwest A&F University,Yangling,Shaanxi 712100,China;Yellow River Delta Modern Agricultural Engineering Laboratory,Institute of Geographic Sciences and Natural Resources Research,Chinese Academy of Sciences,Beijing 100101,China)

机构地区：[1]西北农林科技大学资源与环境学院,陕西杨凌712100 [2]中国科学院地理科学与资源研究所黄河三角洲现代农业工程实验室,北京100101

出　　处：《土壤学报》2025年第1期165-176,共12页Acta Pedologica Sinica

基　　金：国家自然科学基金项目(42107331)资助。

摘　　要：人工植被对毛乌素沙地生态系统恢复具有重要作用,了解典型人工植被根际与非根际土壤磷(P)形态特征,可为该区科学开展植被建设提供依据。采集毛乌素沙地7种典型人工植被(樟子松、小叶杨、长柄扁桃、紫穗槐、沙柳、臭柏和沙蒿)根际和非根际土壤,采用蒋柏藩–顾益初分级方法对比分析不同形态P含量。结果表明,沙柳根际土全磷(TP)含量显著高于其他植被,小叶杨、长柄扁桃和沙蒿根际土有效磷(AP)含量显著高于非根际土,表明种植小叶杨等3种植被有利于AP的活化;不同植物根际土与非根际土之间P形态差异显著:樟子松、长柄扁桃、紫穗槐和沙柳4种人工植被根际土八钙型磷酸盐(Ca_(8)-P)含量均低于非根际土,紫穗槐根际土铝结合态磷(Al-P)和铁结合态磷(Fe-P)较非根际土降幅最大,沙柳根际和非根际土的十钙型磷酸盐(Ca_(10)-P)含量差异相对较小。Al-P和Fe-P在大多数植被根际土壤中与AP呈显著正相关关系,是参与土壤P转化的主要形态。研究结果从土壤磷可持续角度为现有人工林的管理和种植模式布局提供了科学依据。【Objective】Artificial vegetation plays an important role in the restoration of the ecosystem in Mu Us Sandy Land.Understanding the phosphorus(P)forms in the rhizosphere and bulk soils of typical artificial vegetation can provide a basis for scientific vegetation construction in the area.【Method】The rhizosphere soil and bulk soil of seven typical artificial vegetations(Pinus sylvestris,Populus simonii,Amygdalus pedunculata,Amorpha fruticosa,Salix psammophila,Sabina vulgaris,and Artemisia ordosica)in Mu Us Sandy Land were collected and the phosphorus content of different forms were subsequently determined using Jiang-Gu phosphorus fractionation method.【Result】The results showed that 1)The total phosphorus(TP)content of Salix psammophila rhizosphere soil was significantly higher than that of other vegetation types while Populus simonii,Amygdalus pedunculata,and Artemisia ordosica increased available phosphorus(AP)content in rhizosphere soil.This indicates that planting Populus simonii and the other 3 vegetation types was beneficial for P activation.2)The Ca_(8)-P content in rhizosphere soil of Pinus sylvestris,Amygdalus pedunculata,Amorpha fruticosa,and Salix psammophila was lower than in the bulk soil.The decrease in Al-P and Fe-P in Amorpha fruticose rhizosphere soil was the largest,and the difference in Ca(10)-P content between rhizosphere and bulk soil was the smallest in Salix psammophila.【Conclusion】Al-P and Fe-P showed a significant positive correlation with AP in most vegetation rhizosphere soils and were the main forms involved in soil P transformation.This study provides scientific evidence and directives for the management and planting pattern layout of plantations to promote sustainable P management.

关 键 词：毛乌素沙地 人工植被 根际效应 磷形态 磷有效性 

分 类 号：S158.5[农业科学—土壤学]