宁南山区不同植被类型土壤生态化学计量特征与碳储量  

Ecological Stoichiometry and Carbon Storage Under Different Vegetation Types in Mountainous Area of Southern Ningxia,China

作　　者：丁鑫丽 马振华 赵慧雪 康龙 曹扬[1,2,6] DING Xinli;MA Zhenhua;ZHAO Huixue;KANG Long;CAO Yang(The Research Center of Soil and Water Conservation and Ecological Environment,Chinese Academy of Sciences and Ministry of Education,Yangling,Shaanxi 712100,China;Institute of Soil and Water Conservation,Chinese Academy of Sciences and Ministry of Water Resources,Yangling,Shaanxi 712100,China;University of Chinese Academy of Sciences,Beijing 100049,China;Northwest Surveying,Planning and Designing Institute of National Forestry and Grassland Administration,Xi’an 710048,China;College of Forestry,Northwest A&F University,Yangling,Shaanxi 712100,China;State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau,Northwest A&F University,Yangling,Shaanxi 712100,China)

机构地区：[1]中国科学院教育部水土保持与生态环境研究中心,陕西杨凌712100 [2]中国科学院水利部水土保持研究所,陕西杨凌712100 [3]中国科学院大学,北京100049 [4]国家林业和草原局西北调查规划院,西安710048 [5]西北农林科技大学林学院,陕西杨凌712100 [6]西北农林科技大学黄土高原土壤侵蚀与旱地农业国家重点实验室,陕西杨凌712100

出　　处：《水土保持学报》2024年第5期364-373,共10页Journal of Soil and Water Conservation

基　　金：宁夏回族自治区重点研发计划项目(2020BCF01001);国家自然科学基金面上项目(41977418,42130717)。

摘　　要：[目的]为了阐明不同植被类型的土壤养分状况与固碳能力差异。[方法]以宁夏南部山区具有代表性的乔木纯林(山杏林和刺槐林)、乔木混交林(刺槐+山杏)、乔灌混交林(山桃+柠条)、灌木林(沙棘)、草地共6种植被类型为研究对象,通过野外调查和室内分析相结合的方式,研究各植被类型0—100cm土层的生态化学计量特征与碳储量。[结果]研究区土壤C、N、P变化分别为19.74~35.11,1.74~3.19,1.60~1.69g/kg,C、N均表现为随土层深度的增加而递减,其中刺槐+山杏林地的C、N在0—80cm土层显著高于其他类型,P在各类型和土层间均无显著性差异。土壤C∶N在0—40cm土层刺槐林显著较低,40—100cm土层不同植被类型间无显著差异,土壤C∶P和N∶P受植被类型影响较大,表现为刺槐+山杏林地最高。各植被类型的C∶N在不同土层间没有明显差异,C∶P和N∶P表现为随着土层的增加而降低。土壤0—100cm土层碳储量为5.98~38.21t/hm^(2),各植被类型间差异较大,总体表现为刺槐+山杏>刺槐>山杏>沙棘>山桃+柠条>草地,刺槐+山杏林显著高于其他植被类型。[结论]宁南山区乔灌林地养分循环模式与固碳能力优于草地,且刺槐+山杏混交林造林模式最佳,营造混交林是提高土壤固碳能力的一个重要途径。[Objective]To elucidate the differences in soil nutrient status and carbon sequestration capabilities among various vegetation types.[Methods]This study focused on six representative vegetation types in the southern mountainous areas of Ningxia:pure tree plantations(Prunus sibirica L.and Robinia pseudoacacia L.),mixed tree plantations(Robinia pseudoacacia L.+Prunus sibirica L.),mixed tree and shrub plantations(Prunus davidiana(Carrière)Franch.+Caragana korshinskii Kom.),shrub plantations(Hippophae rhamnoides L.),and grasslands.Through a combination of field surveys and laboratory analyses,we investigated the ecological stoichiometry and carbon storage of the 0-100 cm soil layer across these vegeta tion types.[Results]C,N,and P contents varied between 19.74~35.11 g/kg,1.74~3.19 g/kg,and 1.60~1.69 g/kg,respectively,with both C and N contents decreasing with increasing soil depth.Furthermore,the C and N contents in the Robinia pseudoacacia L.+Prunus sibirica L.were significantly higher than those in other types up to a depth of 80 cm,while P content showed no significant differences among types or soil layers.Soil C∶N ratio were significantly lower in Robinia pseudoacacia L.+Prunus sibirica L.within the 0-40 cm layer,with no significant differences observed among vegetation types from 40-100 cm.Soil C∶P and N∶P ratios were significantly influenced by vegetation type,showing the highest values in the mixed forest of Robinia pseudoacacia L.and Prunus sibirica L.;Soil C∶N of these vegetation types showed no significant differences among layers.Soil C∶P and N∶P ratios were decreased with soil depth.Soil carbon storage 0-100 cm varied between 5.98~38.21 t/hm^(2)and had significant differences among these types,with all of them showed the order:Robinia pseudoacacia L.+Prunus sibirica L.>Robinia pseudoacacia L.>Prunus sibirica L.>Hippophae rhamnoides L.>Prunus davidiana(Carrière)Franch.+Caragana korshinskii Kom.>grassland.In addition,the mixed plantation of Robinia pseudoacacia L.and Prunus sibirica L.had sig

关 键 词：宁南山区 植被类型 生态化学计量 碳储量 

分 类 号：S714.5[农业科学—林学]