摘要
明确不同树种对土壤团聚体有机碳分布特征的影响,将有助于合理选择成都平原造林树种。以亚热带同质园中7种阔叶树种:大叶樟、油樟、香樟、天竺桂、香椿、红椿和桤木为研究对象,5 a(2015-2020年)后测定不同树种人工林和邻近撂荒地土壤团聚体组成及有机碳含量和储量分布特征。结果表明:1)不同树种及撂荒地土壤团聚体组成均以2~5 mm和>5 mm团聚体为主,两者含量之和均>90.11%,且不同树种及撂荒地土壤团聚体含量随粒径的减小而降低;2)天竺桂各团聚体粒径间有机碳含量最高,香樟各团聚体粒径间有机碳含量最低;在0~30 cm的土层中,不同树种及撂荒地土壤团聚体有机碳储量均表现出随着团聚体粒径的减小呈递减的变化趋势;3)同质园不同树种未影响土壤团聚体的平均重量直径和几何平均重量直径,但对土壤团聚体的分形维数具有显著影响。在0~20 cm土层中,土壤团聚体分形维数以天竺桂最低,大叶樟最高。研究表明,树种可能通过改变凋落物的输入及根系活动影响土壤团聚体有机碳分布,樟属植物相比其他树种更有利于土壤团聚体的形成、结构及稳定性,增加土壤有机碳的含量及储量。
The objective of this study was to understand the effects of different tree species on the organic carbon distribution characteristics of soil aggregate to select suitable tree species for the afforestation in Chengdu Plain.Seven broad-leaved tree species planted in a common garden were used as research objects,including Cinnamomum septentrionale,C.longepaniculatum,C.japonicum,C.camphora,Toona ciliata,T.sinensis and Alnus cremastogyne.After growing for 5 years(2020),the soil aggregate composition and carbon distribution characteristics in the soils of seven trees and control(abandoned land)were determined to explore the effects of tree species on the distribution characteristics of organic carbon in soil aggregates.The results showed that 1)soil aggregates in forest trees and control was dominated by>5 mm and 2-5 mm aggregates,accounting more than 90.11%of the soil aggregates contents.Moreover,the content of soil aggregates in forest trees and control decreased with the decrease of grain size.2)Soil organic carbon content in different grain size soil aggregates was the highest in C.japonicum stand,and the lowest in C.camphora stand.In the soil depth of 0-30 cm,the organic carbon reserves of soil aggregates in different tree species and the control were manifested as the decrease in the particle size of aggregates.3)Different tree species in the common gardens did not affect the average weight diameter and geometric average weight diameter of soil aggregates,but had a significant impact on the fractal dimension of soil aggregates.In the 0-20 cm soil layer,the fractal dimension of soil aggregates was the lowest for C.cassia and highest for C.camphora.The content of soil aggregates is an important factor affecting the organic carbon content and reserves of soil aggregates.Overall,C.japonicum can improve the formation,structure and stability of soil aggregates than more effectively than other tree species by increasing the content of soil moisture,improving the utilization efficiency of moisture,significantly increasing the content of soil organic carbon and reserves.
作者
郭冉
洪宗文
李彦霖
骆紫藤
袁亚玲
游成铭
徐振锋
谭波
GUO Ran;HONG Zongwen;LI Yanlin;LUO Ziteng;YUAN Yaling;YOU Chengming;XU Zhenfeng;TAN Bo(Forestry Carbon Sink Research Center,College of Forestry,Sichuan Agricultural University/Soil and Water Conservation and Desertification Control Key Laboratory of Sichuan Province,Chengdu 611130,Sichuan,China;Key Laboratory of Forest Resources Conservation and Ecological Security in Upper Reaches of the Yangtze River,Chengdu 611130,Sichuan,China;No.4 Engineering Corporation Limited of China Rallway No.23 Bureau Group Co.Ltd,Chengdu 611130,Sichuan,China)
出处
《西北林学院学报》
CSCD
北大核心
2024年第5期37-45,共9页
Journal of Northwest Forestry University
基金
国家自然科学基金面上项目(32301663)
四川省自然科学基金项目(2022NSFSC1037、2024NSFSC0354)。
关键词
同质园
土壤团聚体
团聚体稳定性
common garden
soil aggregate
soil aggregate stability
