狗牙根和结缕草草坪土壤呼吸对践踏胁迫的响应  

The Response of Soil Respiration to Trampling Stress in Bermudagrass and Zoysiagrass Turfs

作　　者：卫宏健 丁杰 王咏琪 杨文 葛良法 刘天增 张巨明 WEI Hongjian;DING Jie;WANG Yongqi;YANG Wen;GE Liangfa;LIU Tianzeng;ZHANG Juming(College of Forestry and Landscape Architecture,South China Agricultural University,Guangzhou 510642,China;Guangdong Engineering Research Center for Grassland Science,Guangzhou 510642,China)

机构地区：[1]华南农业大学林学与风景园林学院,广东广州510642 [2]广东省草业工程技术研究中心,广东广州510642

出　　处：《中国草地学报》2023年第9期77-86,共10页Chinese Journal of Grassland

基　　金：广州市重点研发计划(202103000066);广东省基础与应用基础研究基金项目(2020A1515011261)共同资助。

摘　　要：本试验对Tifgreen杂交狗牙根(Cynodon dactylon×Cynodon transvaalensiscv.Tifgreen)、普通狗牙根(Cynodon dactylon)、兰引Ⅲ号结缕草(Zoysia japonica cv.Lanyin No.3)和青岛结缕草(Zoysia japonica cv.Qingdao)草坪进行践踏处理,动态监测其地上和地下生物量以及土壤温度、含水量和土壤呼吸速率变化,明确影响土壤碳排放的主要因素并探讨土壤呼吸速率与各因素间的关系。结果表明:践踏胁迫增加了草坪的土壤温度,显著降低了土壤含水量、地上/地下生物量,从而极大降低草坪土壤呼吸速率及温度敏感性(Q_(10)),其中兰引Ⅲ号结缕草的土壤呼吸速率及温度敏感性受践踏胁迫的影响最小。对照处理与践踏处理下4个草坪草的土壤呼吸速率与0~10 cm土壤温度(T)均具有显著的相关性,践踏胁迫降低了土壤呼吸速率与土壤温度的相关性;提升了土壤呼吸速率与土壤含水量、地上/地下生物量的相关性。本试验明确了4个草坪草土壤碳排放对践踏胁迫的响应,从土壤呼吸的角度为草坪草种的选择和管理提供理论依据。In this study,trampling treatment was conducted on four different turf types,including Cyn⁃odon dactylon×Cynodon transvaalensis cv.Tifgreen,Cynodon dactylon,Zoysia japonica cv.Lanyin No.3,and Zoysia japonica cv.Qingdao.The soil respiration rate,soil temperature,water content,and above-and below-ground biomass of these turf types were dynamically monitored to identify the key factors affecting soil carbon emissions.Additionally,we investigated the relationship between soil respiration rate and relevant factors.The results showed that trampling had significant effects on the four turf types,leading to increased soil temperature and decreased soil water content and above/below ground biomass.Consequently,the soil respiration rate and temperature sensitivity(Q_(10))were significantly reduced.The soil respiration and temperature sensitivity of Lanyin No.3 zoysiagrass were the least affected by trampling stress.For all four turf types,soil respiration rate exhibited significant correlations with 0~10 cm soil temperature(T)under both control and trampling treatments.Thus,trampling treatment decreased the correlation between soil respiration and soil temperature,while it increased the correlation between soil respiration rate and soil water content and above/below ground biomass.In conclusion,this study elucidated the response of soil carbon emissions to trampling stress in the four turf types,providing a theoretical basis for turfgrass species selection and management,with a focus on soil respiration.

关 键 词：践踏胁迫 土壤呼吸 草坪 生物量 温度敏感性 

分 类 号：S688.4[农业科学—观赏园艺]