不同灌溉方式对侧柏人工林土壤呼吸的影响  

Effects of Different Irrigation Methods on Soil Respiration of Platycladus Orientalis Plantation

作　　者：李泽霞 陈爱华 田晋华 LI Ze-xia;CHEN Ai-hua;TIAN Jin-hua(Institute of Soil and Water Conservation of Gansu,Lanzhou 730020,China)

机构地区：[1]甘肃省水土保持科学研究所,兰州730020

出　　处：《节水灌溉》2023年第9期100-104,113,共6页Water Saving Irrigation

基　　金：甘肃省水利重点科研计划项目(甘水科外发[2019]8号,甘水建管发[2020]46号,甘水建管发[2022]59号)。

摘　　要：为探究不同灌溉方式对半干旱区人工林土壤呼吸的影响,以侧柏人工林为研究对象,采用LI-8100土壤碳通量测量系统测定3种灌溉方式下林地的土壤呼吸速率,分析土壤呼吸变化特征及其对温度和水分的响应机制。结果表明:3种灌溉方式下侧柏人工林的土壤呼吸速率日变化均呈现先升高后降低的单峰变化,不同月份的月均值表现为漫灌[2.07μmol/(m^(2)•s)]>穴灌[1.65μmol/(m^(2)•s)]>喷灌[1.36μmol/(m^(2)•s)]。地表温度、5 cm土壤温度和10 cm土壤含水率与喷灌林地土壤呼吸速率均呈现极显著相关关系(p<0.01)。温度敏感性系数Q10在1.54~2.34之间,喷灌林地土壤呼吸速率对温度的敏感性高于另外2种灌溉方式。研究结果可为半干旱区人工林调控土壤碳排放,选择适宜的灌溉方式提供参考依据。To explore the effects of different irrigation methods on the soil respiration of plantation in the semi-arid area,the soil respiration rate of three irrigation methods was measured using a LI-8100 soil carbon flux measurement system in platycladus orientalis plantation,and to analyze the characteristics of soil respiration and its response mechanism to temperature and water.The results showed that the diurnal variation of soil respiration rate in the three irrigation methods showed a unimodal variation of first increase and then decrease,and the daily average value in different months showed the order of flood irrigation(2.07μmol/(m^(2)•s))>hole irrigation(1.65μmol/(m^(2)•s))>sprinkler irrigation(1.36μmol/(m^(2)•s)),soil respiration in sprinkler irrigation forestland showed a significant(p<0.01)positive correlation with surface temperature and 5 cm soil temperature and 10 cm soil moisture.The temperature sensitivity coefficient Q10 was between 1.54 and 2.34,and the sensitivity of soil respiration rate to temperature in sprinkler-irrigated woodland was higher than that of the other two irrigation methods.The research results can provide a reference for regulating soil carbon emissions and selecting appropriate irrigation methods for plantations in semi-arid areas.

关 键 词：侧柏人工林 漫灌 穴灌 喷灌 土壤呼吸 土壤温度 土壤含水率 温度敏感性系数 

分 类 号：S275[农业科学—农业水土工程]