不同铺设年限沙柳沙障土壤养分的变化  

Changes Surrounding Soil Nutrients of Salix psammophila Sand Barriers in Different Setting Years

作　　者：赵晨 高永 党晓宏 王瑞东 杨晓杰 王浩 ZHAO Chen;GAO Yong;DANG Xiaohong;WANG Ruidong;YANG Xiaojie;WANG Hao(Institute of Desert Control Science and Engineering,Inner Mongolia Agricultural University,Hohhot 010018,China;Inner Mongolia Hanggin Desert Ecological Position Research Station,Erods 017400,Inner Mongolia,China)

机构地区：[1]内蒙古农业大学沙漠治理学院,呼和浩特010018 [2]内蒙古杭锦旗荒漠生态定位观测研究站,内蒙古鄂尔多斯017400

出　　处：《四川农业大学学报》2022年第4期583-590,共8页Journal of Sichuan Agricultural University

基　　金：国家自然基金“大气-沙土界面动态过程对沙柳沙障耐蚀性的强化机制”(4186010085)。

摘　　要：【目的】为了探寻设障年限增加对土壤碳(C)、氮(N)和磷(P)养分含量以及生态化学计量比的变化。【方法】以库布齐沙漠穿沙公路两侧已铺设1~7 a的沙柳沙障周际土壤为研究对象,分析沙柳沙障沙埋部周际土壤中C、N、P含量以及化学计量比特征的变化。【结果】①设障1~7 a的沙柳沙障周际土壤养分含量有着显著差异(P<0.05),土壤pH呈弱碱性,土壤含水率随设障年限呈现逐年下降趋势。②设障1~7 a的沙柳沙障周际土壤中SOC(有机质含量)和TN(全效氮含量)均有显著差异(P<0.05),其SOC、TN和TP(全效磷)均属中等变异。③沙柳沙障周际土壤中SOC、TN含量与C∶N、C∶P存在显著或极显著相关关系,SOC、TN是影响沙柳沙障土壤生态化学计量比的主要因素。【结论】沙柳沙障在铺设3 a和铺设5 a时间段是其周际土壤养分变化的重要时间转折点,建议在设障3、5 a时多注意养护,防止沙障破损导致土壤养分的流失。【Objective】This study aims to explore the effects of increasing the years of Salix psammophila sand barriers soil carbon(C),nitrogen(N),phosphorus(P)content and ecological stoichiometric ratio of surrounding soil.【Method】Taking Salix psammophila sand barriers setting for 1-7 laid on either side of highway in Kubuqi Desert as the research object,the variation of soil C,N,P and ecological stoichiometric ratio characteristics of surrounding soil with setting years were analyzed.【Result】①There were significant differences in soil nutrient contents between 1-7 years'Salix psammophila barrier(P<0.05),soil pH was weakly alkaline and soil water content decreased year by year with the barrier year.②Significant differences were detected in SOC(soil organic matter)and TN(total nitrogen)(P<0.05),SOC,TN and TP(total phosphorus)were all moderately variable.③SOC and TN were significantly or extremely significantly correlated with C∶N and C∶P,which indicated that SOC and TN were the main factors affecting ecological stoichiometric ratio of Salix psammophila sand barriers soil.【Conclusion】The Salix psammophila sand barriers setting for three and five years are important turning point of nutrient change,thus suggested to pay more attention to the maintenance during these periods to prevent nutrient flow caused by sand barriers damage.

关 键 词：沙柳沙障 土壤养分 生态化学计量比 库布其沙漠 

分 类 号：S157.1[农业科学—土壤学]