光伏电站内不同植被下土壤C、N、P化学计量特征  

Stoichiometric characteristics of soil C,N and P under different vegetation in the photovoltaic power station

作　　者：赵晶 张有新 李文龙 刘美英 ZHAO Jing;ZHANG You-xin;LI Wen-long;LIU Mei-ying(College of Grassland,Resources and Environment,Inner Mongolia Agricultural University,Inner Mongolia Key Laboratory of Soil Quality and Nutrient Resource,Hohhot Inner Mongolia 010018)

机构地区：[1]内蒙古农业大学草原与资源环境学院,内蒙古自治区土壤质量与养分资源重点实验室,内蒙古呼和浩特010018

出　　处：《中国土壤与肥料》2021年第5期21-26,共6页Soil and Fertilizer Sciences in China

基　　金：国家重点研发计划(2016YFC0501008);国家自然科学基金(41301605)。

摘　　要：西部地区光伏电站的建设和运营会对土壤和植被产生一定破坏,造成局地风沙危害。以光伏电站内樟子松、苜蓿和黄芪样地为研究对象,对不同植被下土壤养分及其化学计量进行研究,为光伏电站内植被恢复模式选择提供数据支撑。结果表明,不同植被下土壤有机碳(SOC)、全氮(TN)、全磷(TP)含量的大小顺序为SOC>TN>TP。相同植被间,黄芪地表层土壤的SOC含量显著高于底层,苜蓿地则是下层显著高于表层;不同植被间,只有黄芪地表层土壤SOC含量显著高于苜蓿地,下层土壤SOC则是苜蓿地显著高于黄芪地,其余样地间土壤SOC、TN和TP差异均不显著。整个研究区C、N、P化学计量比的大小顺序为C∶P>C∶N>N∶P。0~20 cm表层土壤均是黄芪地C∶N、C∶P和N∶P大于樟子松地和苜蓿地(差异不显著),而20~40 cm土层则是苜蓿地C∶N、C∶P和N∶P最大(只有苜蓿地和黄芪地间的C∶P差异显著);不同土层间只有黄芪地的表层土C∶N显著高于底层土。土壤SOC、TN、TP、C∶N和N∶P含量均为弱变异,只有C∶P为中等变异。土壤SOC与C∶N和C∶P,C∶N与C∶P,N∶P与TN均呈极显著正相关。研究区土壤的C∶P为12.79,远低于中国陆地土壤C∶P平均值,表明光伏电站土壤N素缺乏,C偏低,N为养分限制因子。The construction of photovoltaic power station can destroy the surface soil and the vegetation and cause local wind and sand hazards,which needs to restore vegetation after the power station is built.The soil nutrients and their stoichiometry under different vegetation patterns were studied in different field(Pinus sylvestris var.mongolica,Medicago Sativa L.and Astragalus membranaceus var.mongholicus),which provided data support for the impact of the power station construction on the local natural environment.The results were as follows:The contents of soil nutrients were SOC>TN>TP.Among the same vegetation type,SOC content of Astragalus was significantly higher in the surface soil than in the subsoil.SOC content of Medicago Sativa L.field was significantly higher in the subsoil soil than in the surfacesoil.Among different vegetation types,only surface soil SOC of Astragalus was significantly higher than that of Medicago Sativa L.Subsoil SOC of Medicago Sativa L.was significantly higher than that of Astragalus.SOC,TN and TP in other vegetation field were no significant difference.The order of C N P stoichiometric ratio in the whole research area was C∶P>C∶N>N∶P.The C∶N and C∶P and N∶P of Astragalus field were higher than those of Pinus sylvestris and Medicago Sativa L.in the surfacesoil(0~20 cm),and there was no significant difference among them.C∶N and C∶P and N∶P of Medicago Sativa L.field was the largest in the subsoil(20~40 cm).Only the C∶N of surfacesoil of Astragalus was significantly higher than that of the subsoil.The contents of SOC,TN,TP,C∶N and N∶P were all weakly variable.C∶P was moderately variable.SOC was significantly positively correlated with C∶N and C∶P.The same as C∶N with C∶P and N∶P with TN.The C∶P of soil in the study area was 12.79,far lower than average C∶P of land soil in China,which indicated that the soil N of photovoltaic power station was the nutrient limiting factor.

关 键 词：光伏电站 植被 化学计量特征 养分因子 

分 类 号：Q948.113[生物学—植物学]