文献类型：期刊文献

中文题名：穿透雨减少对红椎人工林土壤有机碳含量和化学组分的影响

英文题名：Effects of throughfall reduction on soil organic carbon concentration and chemical compositions in the Castanopsis hystrix plantation

作者：王晖[1] 王健[1] 杨予静[2] 陈琳[3] 刘世荣[1]

第一作者：王晖

机构：[1]中国林业科学研究院森林生态环境与自然保护研究所,国家林业和草原局森林生态环境重点实验室,北京100091;[2]湖北大学资源与环境学院,区域发展与环境响应湖北省重点实验室,湖北武汉430062;[3]中国林业科学研究院热带林业实验中心,国家林业和草原局广西友谊关森林生态系统国家定位观测研究站,广西凭祥532600

年份：2022

卷号：44

期号：10

起止页码：102-111

中文期刊名：北京林业大学学报

外文期刊名：Journal of Beijing Forestry University

收录：CSTPCD;;北大核心:【北大核心2020】；CSCD:【CSCD2021_2022】；

基金：中国林业科学研究院基本科研业务费专项(CAFYBB2020ZA001);国家重点研发计划课题(2021YFD2200402)。

语种：中文

中文关键词：穿透雨减少;土壤有机碳;有机碳组分;南亚热带;人工林

外文关键词：throughfall reduction;soil organic carbon;organic carbon composition;south subtropical zone;plantation

分类号：S792.17;S714.8

摘要：【目的】在全球气候变化导致的降水格局改变下,通过研究穿透雨减少(减雨)对南亚热带红椎人工林土壤有机碳含量及其化学组分的影响,为准确预测气候变化对人工林生态系统固碳功能的潜在影响提供科学依据。【方法】2012年,在广西友谊关森林生态系统国家定位观测研究站,29年生红椎人工林内随机布设了3个减雨处理样地和3个对照样地,每个样地面积为20 m×20 m。减雨处理第6年,分别测定了干季(3月)和湿季(7月)土壤有机碳含量和化学组成、凋落物总量及其组分、细根生物量、土壤微生物量及功能基因丰度,分析了减雨对红椎人工林土壤有机碳和化学稳定性的影响和主导因素。【结果】(1)减雨显著降低了干季土壤含水量和干、湿季细根生物量,而减雨对干、湿季的凋落物总量、凋落物各组分和土壤微生物量无显著影响。(2)干季,减雨显著降低了土壤烷基碳比例和烷基碳/氧烷基碳的值,但显著增加了土壤芳香碳比例和芳香碳/烷基碳的值;湿季,减雨对土壤有机碳及其化学组分均无显著影响。(3)凋落物量对土壤有机碳化学组分的改变起主要作用。【结论】经过6年的减雨处理,虽然土壤有机碳含量没有明显改变,但是在干季显著降低了稳定性高的土壤烷基碳比例,并提高了土壤有机碳芳香化程度。因此,南亚热带地区未来降水减少情境有可能降低红椎人工林的土壤有机碳的化学稳定性。
[Objective]Under the background of the change of precipitation pattern caused by global warming,the study of the impact of throughfall reduction(rain reduction)on soil organic carbon(SOC)concentration and chemical composition of Castanopsis hystrix plantations in the southern subtropical region was carried out,and it will provide a scientific basis for accurately predicting the potential impact of climate change on the SOC sequestration function of plantation ecosystem.[Method]In 2012,in the Guangxi Youyiguan Forest Ecosystem Research Station,three throughfall reduction treatment sample plots and three control sample plots were randomly selected in a 29 years old C.hystrix plantation,each sample plot was 20 m×20 m.In the sixth year of throughfall reduction treatment,the SOC concentration and chemical composition,total amount and components of litter,fine root biomass,soil microbial biomass and functional gene abundance in dry season(samplings in March)and wet season(samplings in July)were measured,respectively.The effects of throughfall reduction on SOC concentration and chemical stability were analyzed.[Result](1)Throughfall reduction significantly decreased soil water content in dry season and fine root biomass in dry and wet season,but there were no differences in the total litter,litter components and soil microbial biomass in dry and wet seasons.(2)In the dry season,throughfall reduction significantly reduced the soil alkyl C and alkyl C/O-alkyl C,but significantly increased the soil aromatic C and aromatic C/alkyl C.In the wet season,throughfall reduction had no effect on SOC concentration and chemical compositions.(3)Litterfall played a major role in the change of chemical compositions of SOC.[Conclusion]After six years of throughfall reduction treatment,although the content of SOC doesn’t change significantly,the proportion of soil alkyl C with high stability decreases and the aromatization degree of SOC is improved in dry season.Therefore,the projected precipitation reduction scenario may reduce the chemical stability of SOC in C.hystrix plantations in the southern subtropical region.