川西北沙地植被恢复对土壤碳氮磷及生态化学计量特征的影响  

Effects of Vegetation Restoration of Sandy Land on the Characteristics of Soil Carbon,Nitrogen,Phosphorus and its Ecological Stoichiometry in Northwest Sichuan

作　　者：曹全恒 胡健 陈雪玲 孙梅玲 刘小龙 杨丽雪[1,2] 周青平 CAO Quan-heng;HU Jian;CHEN Xue-ling;SUN Mei-ling;LIU Xiao-long;YANG Li-xue;ZHOU Qing-ping(Sichuan Zoige Alpine Wetland Ecosystem National Observation and Research Station,Southwest Minzu University,Chengdu,Sichuan Province 610041,China;Institute of Qinghai-Tibet Plateau,Southwest Minzu University,Chengdu,Sichuan Province 610041,China)

机构地区：[1]西南民族大学四川若尔盖高寒湿地生态系统国家野外科学观测研究站,四川成都610041 [2]西南民族大学青藏高原研究院,四川成都610041

出　　处：《草地学报》2022年第3期523-531,共9页Acta Agrestia Sinica

基　　金：第二次青藏高原综合科学考察研究项目(2019QZKK0307);国家自然科学基金项目(42007057);西南民族大学研究生创新型科研项目(CX2021SZ24)资助。

摘　　要：本文以川西北退化草地植被恢复区自然放牧草地(NGG)、围栏封育沙化草地(FEDG)、自然灌丛草地(NS)和人工种植高山柳沙化草地(SCDG)为研究对象,通过植物群落调查与土壤理化性质的测定,探讨川西北自然与人工恢复沙化草地土壤碳氮磷及生态化学计量特征。结果表明,除土壤全磷储量外,所选草地植被类型在0~60 cm土层土壤碳、氮、磷的含量、储量和比值都存在显著差异(P<0.05),土壤全磷含量高低顺序为NS>FEDG>NGG>SCDG,除氮磷比(N∶P)外,其余土壤指标高低顺序为NS>NGG>FEDG>SCDG,土壤全磷储量在NS显著高于其它类型(P<0.05)。4类植被类型的土壤全氮和全磷含量及NS和NGG的有机碳含量随土层深度增加而显著降低(P<0.05)。除N∶P外,NGG和NS的土壤碳氮比(C∶N)、碳磷比(C∶P)都随土壤土层深度的加深而显著降低(P<0.05)。自然灌丛草地比自然草地和人工植被恢复沙地具有更高的土壤养分含量,可作为沙地生态恢复模式进一步优化的参考。The study chose the natural grazing grassland,fencing enclosure desertified grassland,natural shrubland,and artificially planted Salix cupularis desertified grassland to investigate the plant community and soil physicochemical properties in the vegetation recovery area of degraded grassland of Northwest Sichuan.And we determined the characteristics of soil carbon,nitrogen,phosphorus,and ecological stoichiometry of natural and artificially restored desertified grassland.The results showed that all grassland vegetation types had significant differences in the content,storage,and ratio of soil carbon,nitrogen,and phosphorus in 0~60 cm profile except for the storage of total soil phosphorus(P<0.05).At the same time,the order of total soil phosphorus content was NS>FEDG>NGG>SCDG,while other soil indexes were NS>NGG>FEDG>SCDG,except for the ratio of N∶P,especially in the storage of total soil phosphorus under the NS(P<0.05).The content of total soil nitrogen and phosphorus among the four vegetation types and organic carbon content under the NS and NGG decreased significantly with the increase of soil depth(P<0.05).The proportion of C∶N and C∶P under the NGG and NS decreased substantially with the soil depth except for the ratio of N∶P(P<0.05).Natural shrub grassland had higher soil nutrients than natural grassland,and artificial vegetation recovery sandy land.This study can be used as a reference for further optimizing the ecological restoration measures.

关 键 词：沙化草地 灌丛草地 人工恢复 土壤化学计量 

分 类 号：S153.61[农业科学—土壤学]