摘要
探究极端干旱生态移民区不同土地利用类型土壤温度与含水率对土壤呼吸速率影响,为准确揭示研究区不同土地利用类型碳循环特征提供科学支撑。采用LI-8100土壤碳通量测量系统和土壤墒情监测仪,在2023年5、6、7月中旬,将研究区分为荒草地、柠条林、原地貌和耕地4种土地利用类型测定了土壤呼吸速率、土壤温度和土壤含水率。结果表明:(1)土壤呼吸速率整体表现为:耕地>荒草地>柠条林地>原地貌。在达到最适温度前不同土地利用类型的土壤呼吸速率均与温度呈显著正相关(P<0.05),超过最适温度会降低土壤呼吸速率。(2)不同土地利用类型土壤呼吸速率均能与5cm深度土壤温度进行较好的指数模型拟合,Q10值介于3.18~4.66之间,且原地貌、耕地的土壤呼吸速率与10 cm深度土壤温度的相关性显著(P<0.05)。(3)土壤呼吸速率与土壤含水率(10 cm)之间线性相关性不显著(P>0.05),除柠条林地外其余3种土地利用类型土壤温度(5 cm)和土壤含水率(10 cm)的交互作用显著相关(P<0.05)。不同土地利用类型对极端干旱生态移民区的CO_(2)排放影响显著,土壤温度与含水率共同作用是土壤呼吸速率变化的主要影响因素,结合区域气候、制定合理的土地利用政策可进一步助力实现“双碳目标”,以期为极端干旱生态移民区的土地利用总体规划提供理论依据。
To investigate the effects of soil temperature and moisture on soil respiration rate of different land use types in the extreme arid ecological migration area,and to provide scientific support for accurately revealing the carbon cycle characteristics of different land use types in the study area.Soil respiration rate,soil temperature,and soil moisture content were measured in mid-May,June,and July 2023 using the LI-8100 soil carbon flux measurement system and soil moisture monitor,dividing the study area into four land use types:Wild grassland,Caragana forest,original landform,and Cultivated land.The results showed that.①the overall soil respiration rate was as follows:Cultivated land>Wild grassland>Caragana forest>Original landscape.Soil respiration rates of different land use types were significantly positively correlated with temperature before reaching the optimum temperature(P<0.05),and exceeding the optimum temperature would reduce soil respiration rates.②The soil respiration rates of different land use types were well fitted to the exponential model with the soil temperature at 5 cm depth,with Q10 values ranging from 3.18 to 4.66,and the correlation between soil respiration rates and the soil temperature at 10 cm depth was significant(P<0.05)in the original landform and Cultivated land.③The linear correlation between soil respiration rate and soil moisture content(10 cm)was not significant(P>0.05),and the interaction between soil temperature(5 cm)and soil moisture content(10 cm)was significantly correlated(P<0.05)for the three land-use types except Cultivated land.Different land use types have significant effects on CO2 emissions in extreme arid ecological Immigration area,and soil temperature and moisture together are the main factors in the variation of soil respiration rates.The development of rational land-use policies that take into account the regional climate can further help to achieve the“dual-carbon goal”,with a view to providing a theoretical basis for land-use master planning in ecolo
作者
焦秦华
何文博
黄枭
李泽霞
高金芳
JIAO Qin-hua;HE Wen-bo;HUANG Xiao;LI Ze-xia;GAO Jin-fang(Huining county soil maintenance workstation,Baiyin 730799,Gansu Province,China;School of Energy and Power Engineering,Lanzhou University of Technology,Lanzhou 730050,Gansu Province,China;Gansu Institute of Soil and Water Conservation Sciences,Lanzhou 730020,Gansu Province,China)
出处
《中国农村水利水电》
北大核心
2024年第6期90-97,共8页
China Rural Water and Hydropower
基金
甘肃省重点研发计划项目(22YF7FA165)
高端外国专家引进计划项目(22JR10KA006)
2022年陇原青年创新创业人才(团队)项目(甘组通字[2022]77号)
甘肃省水利科学试验研究及推广计划项目(甘水建管发[2022]59号,[2023]67号)。
关键词
土壤呼吸
土地利用类型
土壤温度
土壤含水率
极端干旱区
soil respiration
different types of land use
soil temperature
soil moisture content
extreme arid areas
