不同植被类型城市绿地土壤碳氮分布及影响因素  

Distribution and Influencing Factors of Soil Carbon and Nitrogen in Urban Green Spaces with Different Vegetation Types

作　　者：刘源 李晓晶[1,2] 杨制国 段玉玺 宁静[1] 王伟峰 刘宗奇 桑昊[1] 韩珊珊 LIU Yuan;LI Xiaojing;YANG Zhiguo;DUAN Yuxi;NING Jing;WANG Weifeng;LIU Zongqi;SANG Hao;HAN Shanshan(Inner Mongolia Academy of Forestry Sciences,Hohhot 010010,China;Dalate Desert Ecosystem Research Station,Inner Mongolia,Ordos 014300,China)

机构地区：[1]内蒙古自治区林业科学研究院,内蒙古呼和浩特010010 [2]内蒙古达拉特荒漠生态系统国家定位观测研究站,内蒙古鄂尔多斯014300

出　　处：《内蒙古林业科技》2024年第1期31-37,共7页Journal of Inner Mongolia Forestry Science and Technology

基　　金：内蒙古自然科学基金(2021MS03066)。

摘　　要：城市绿地土壤在调节城市生态系统碳氮循环和缓解热岛效应中起关键作用,但受自然与人为因素交互影响,不同地区、土壤质地或植被类型土壤碳氮分布存在显著差异。本研究选取内蒙古林科院树木园内草地、灌木林、油松(Pinus tabuliformis)人工林和杨(Populus)树人工林为研究对象,分析了各样地不同土层间土壤碳氮含量、储量空间分布特征及其对环境因子的响应。结果表明:(1)不同植被类型城市绿地土壤容重、毛管孔隙度、非毛管孔隙度及饱和持水量变化范围分别为1.37~1.41 g.cm^(-3)、35.71%~39.13%、2.98%~6.75%和31.23%~36.11%,其中草地土壤容重最大,毛管和非毛管孔隙度及饱和持水量最小,杨树人工林则相反;(2)土壤有机碳和全氮含量变幅分别为16.70~38.34 g.kg^(-1)和0.54~1.64 g.kg^(-1),分别在20~40 cm和0~10 cm土层增幅最大,为57.01%和33.33%,且表现为:杨树人工林>油松人工林>灌木林>草地;(3)土壤有机碳和全氮储量变幅分别为126.89~163.33 t.hm^(-2)和4.44~6.24 t.hm^(-2),0~20 cm土层碳氮储量占比最大,均超过总储量的50%,且均在20~40 cm土层增幅最大,分别为53.83%和66.05%;(4)垂直剖面上,各样地土壤碳氮含量、储量均随土层加深而减小,具有明显的表聚性;(5)城市绿地土壤碳氮空间分布影响因素具有综合性和复杂性,本研究中土壤容重、植被类型和微生物数量是土壤碳氮空间分布的主控因子。Urban green soil plays a key role in regulating carbon and nitrogen cycle in urban ecosystem and mitigating the heat-island effect.However,due to the interaction of natural and human factors,there are significant differences in soil carbon and nitrogen distribution among different regions,soil textures or vegetation types.This paper selects grasslands,shrublands,Pinus tabuliformis and poplar plantations in the Arboretum as the research objects,and analyzes the spatial distribution characteristics of soil carbon and nitrogen content,storage,and their response to environmental factors among different soil layers in the experimental site.The results showed that:(1)The variation ranges of soil bulk density,capillary porosity,non capillary porosity and saturated water capacity of urban green spaces with different vegetation types were 1.37-1.41 g.cm^(-3),35.71%-39.13%%,2.98%-6.75%and 31.23%-36.11%,respectively.Among them,grassland soil bulk density was the largest,capillary and non capillary porosity and saturated water capacity were the smallest,while poplar plantations were the opposite.(2)The variation ranges of soil organic carbon and total nitrogen content for different vegetation types were 16.70-38.34 g.kg^(-1) and 0.54-1.64 g.kg^(-1),respectively.The largest increase was observed in the soil layers of 20-40 cm and 0-10 cm,with 57.01%and 33.33%,respectively.The results showed that poplar plantation>Pinus tabuliformis plantation>shrub forest>grassland.(3)The variation ranges of soil organic carbon and total nitrogen storage for different vegetation types were 126.89-163.33 t.hm^(-2) and 4.44-6.24 t.hm^(-2),respectively.The carbon and nitrogen storage in the 0-20 cm soil layer accounted for the largest proportion,both exceeding 50%of the total storage,and both increased the most in the 20-40 cm soil layer,with 53.83%and 66.05%.(4)On the vertical profile,the carbon and nitrogen content and storage of soil in various areas showed a decreasing trend with the deepening of the soil layer,and had obvious surface aggreg

关 键 词：城市绿地 植被类型 碳氮分布 环境因子 呼和浩特市 

分 类 号：S153.6[农业科学—土壤学]