中国桑园土壤碳氮耦合特征的空间分异  

Spatial Differentiation of the Coupling Characteristics of Soil Carbon and Nitrogen on Mulberry Plantations in China

作　　者：王谢[1,2] 胡洋 郭海霞 张建华[1,2] 唐甜[1] 曾其国 WANG Xie;HU Yang;GUO Haixia;ZHANG Jianhua;TANG Tian;ZENG Qiguo(Sichuan Academy of Agricultural Sciences Institute of Agricultural Resources and Environment,Chengdu 610066,China;Southwest Mountain Agricultural Environment Key Laboratory,Ministry of Agriculture and Rural Areas,Chengdu 610066,China;Chengdu Normal University,Chengdu 611130,China)

机构地区：[1]四川省农业科学院农业资源与环境研究所,成都610066 [2]农业农村部西南山地农业环境重点实验室,成都610066 [3]成都师范学院,成都611130

出　　处：《Journal of Resources and Ecology》2023年第1期84-91,共8页资源与生态学报（英文版）

基　　金：The China Agriculture Research System of MOF and MARA (CARS-18);The Project of Sichuan Province Key Lab for Bamboo Pest Control and Resource Development (17ZZ013)。

摘　　要：土壤是桑园生态系统的重要碳库,了解桑园土壤碳库特征对于经济林生态系统和农田生态系统碳汇的研究具有重要的参考意义。本研究通过分析我国华北、华东、中南、西南和西北5个地区的475个桑园表层土壤(0–20cm)和亚表层土壤(20–40cm)的有机碳含量和全氮含量,探讨了桑园土壤碳氮关系的空间分异规律。研究表明:(1)我国桑园土壤有机碳在土层深度上有显著差异,表层土壤有机碳含量为10.71±7.01 g kg-1,比亚表层高出37.13%。(2)我国桑园土壤有机碳具有明显的空间分异,表现为西南地区>中南地区>华东地区>华北地区>西北地区。(3)我国桑园土壤全氮含量对地区、土层深度,及两者的交互作用具有显著的响应。其中,西北地区土壤表层与亚表层之间无显著差异,华东地区全氮含量差异最大,表层全氮含量高出亚表层全氮含量56.68%;而西南地区和华北地区表层全氮含量分别比亚表层高34.27%和20.79%。(4)我国桑园土壤碳氮比显著响应地区差异,表现为西北地区>西南地区>华东地区>中南地区>华北地区,而对土层深度无显著响应。(5)土壤p H在调控我国桑园土壤有机碳和全氮含量上存在显著的空间分异。其中西北地区桑园土壤碳氮含量与pH无显著相关性,中南地区桑园土壤碳氮含量与pH呈显著正相关关系,其余地区桑园土壤碳氮含量与pH呈显著负相关关系。(6)我国桑园表层土壤碳氮比与pH呈显著负相关关系,这主要是西南地区土壤数据的贡献,因为其他地区表层土壤碳氮比与pH无显著相关性。(7)我国各地区桑园亚表层土壤碳氮比与p H无显著相关性。上述研究结果揭示了:我国桑园无论是碳库研究,还是绿色低碳种植技术创新,都不可回避土壤的空间分异特征,而土壤有机碳的空间分异可为桑树造林或生态修复项目提供规划设计的基础分层依据。Soil is the most important carbon pool of the mulberry plantation ecosystem, so understanding the characteristics of the soil carbon pool in mulberry plantations provides an important basis for the research of carbon sinks in economic forest ecosystems and farmland ecosystems. In order to explore the spatial differentiation pattern of the relationship between carbon and nitrogen in mulberry plantation soil, this study analyzed the organic carbon content and total nitrogen content of the surface soil layer(0–20 cm) and the subsurface soil layer(20–40 cm) of 475 mulberry plantations in five major regions of China, Southwest China(SWC), Central South China(CSC), East China(EC), North China(NC), and Northwest China(NWC). The research showed seven key aspects of this system.(1) The soil organic carbon of mulberry plantations was significantly different at the two soil depths. The average content of organic carbon in the surface layer of mulberry plantation soil was 10.71±7.01g kg-1, which was 37.13% higher than that of the subsurface layer.(2) The soil organic carbon of mulberry plantations had significant differences in spatial differentiation, which was manifested as SWC>CSC>EC>NC>NWC.(3) The total nitrogen content in mulberry plantation soil had significant responses to the region, the soil layer depth, and the interaction between the region and soil layer depth. Among the regions, NWC had no significant difference between the surface layer and subsurface layer of the soil. EC had the maximum difference in total nitrogen content, with the total nitrogen content in the surface soil layer being 56.68% higher than that of the subsurface soil layer. The total nitrogen contents of the surface soil layers in the SWC and NC were 34.27% and 20.79% higher than those of the respective subsurface soil layers.(4) The mulberry plantation soil C/N ratios had a significant response to regional differences, as NWC>SWC> EC>CSC>NC, but this ratio had no significant response to soil depth.(5) Soil pH had significant spatial diff

关 键 词：经济林 木本作物 碳库 氮库 碳中和 气候变化 

分 类 号：S153[农业科学—土壤学]