亚热带白云岩喀斯特地区土壤耕层有机碳与养分的垂直分布特征  

Vertical distribution characteristics of soil organic carbon and nutrients in plough layer of subtropical dolomite karst area

作　　者：闫伟 代林玉 肖时珍 邰治钦 蓝家程 肖华 YAN Wei;DAI Linyu;XIAO Shizhen;TAI Zhiqin;LAN Jiacheng;XIAO Hua(School of Karst Science,Guizhou Normal University/State Engineering Technology Institute For Karst Desertification Control,Guiyang,Guizhou 550001,China)

机构地区：[1]贵州师范大学喀斯特研究院/国家喀斯特石漠化防治工程技术研究中心,贵阳550001

出　　处：《生态科学》2023年第4期48-55,共8页Ecological Science

基　　金：国家重点研发计划项目子课题“喀斯特石漠化防治与世界遗产保护及山地旅游产业技术与示范[2016YFC0502606-01];国家自然科学基金“施秉典型白云岩流域的岩溶碳汇通量及其土地利用控制”(41673129);贵州省科学技术基金项目“喀斯特石漠化治理植被生态修复土壤微生物特性及其对土壤有机碳和岩溶作用的影响”(黔科合基础[2017]1417);贵州师范大学资助博士科研项目“贵州施秉白云岩喀斯特石漠化地区土壤侵蚀机理研究”(GZNUD[2017]12号)。

摘　　要：土壤耕层有机碳与养分的垂直分布特征在非喀斯特地区和石灰岩喀斯特地区已有较多研究,但白云岩喀斯特地区却罕见相关研究。为探讨典型白云岩喀斯特地区土壤耕层有机碳与养分的垂直分布特征,以典型白云岩喀斯特施秉世界自然遗产地缓冲区东部则家山土壤耕层为例,采用垂直分层取样分析,研究了土壤耕层有机碳和养分的垂直分布特征。结果表明:土壤耕层从0—10 cm、10—20 cm至20—30 cm的有机碳、全氮、全磷、全钾质量分数均值不断减少,即土壤耕层有机碳、全氮、全磷、全钾的质量分数都随土层深度的增加而逐渐减少;土壤耕层有机碳、全氮、全磷、全钾表层聚集特征不明显;有机碳和养分分级标准均可达到适宜甚至丰富水平,土壤肥力较好;土壤耕层从0—10 cm、10—20 cm至20—30 cm的有机碳、全氮、全磷、全钾储量均值与其质量分数均值的分布特征相同,也随着土层深度增加而逐渐减少。There have been many studies on the vertical distribution of organic carbon and nutrients in the soil arable layer in non-karst areas and limestone karst areas,but there are rare related studies in dolomite karst areas.In order to explore the vertical distribution characteristics of organic carbon and nutrients in the soil arable layer in the typical dolomite karst area,taking the typical dolomite karst soil arable layer as an example in the east of the Zejiashan in the buffer zone of Shibing World Natural Heritage Site,vertical stratified sampling analysis was used to study Vertical distribution characteristics of organic carbon and nutrients in the soil arable layer.The results showed that the average mass fractions of organic carbon,total nitrogen,total phosphorus,and total potassium in the soil cultivated layer from 0-10 cm,10-20 cm to 20-30 cm decreased.The organic carbon,total nitrogen,the mass fractions of phosphorus and total potassium gradually decrease with the increase of soil depth;the accumulation characteristics of organic carbon,total nitrogen,total phosphorus,and total potassium in the soil layer were not obvious;the classification standards for organic carbon and nutrients could reach suitable or even rich.The soil fertility was good;the average values of organic carbon,total nitrogen,total phosphorus,and total potassium reserves of 0-10 cm,10-20 cm to 20-30 cm in the cultivated soil layer had the same distribution characteristics as the average mass fraction of the soil.The depth of the soil layer increased and gradually decreased.

关 键 词：白云岩喀斯特 土壤耕层 有机碳 养分 垂直分布特征 

分 类 号：S158[农业科学—土壤学]