短期降水减少对海南橡胶林土壤有机碳矿化及有机碳组分的影响  

Effects of short-term precipitation reduction on soil organic carbon mineralization and organic carbon fractions in Hainan rubber forests

作　　者：孙玉娟[1] 钟丽爽 杨小波[1] 张翔 SUN Yujuan;ZHONG Lishuang;YANG Xiaobo;ZHANG Xiang(College of Ecology and Environment,Hainan University,Haikou 570228)

机构地区：[1]海南大学生态与环境学院,海口570228

出　　处：《热带生物学报》2024年第3期272-280,共9页Journal of Tropical Biology

基　　金：海南省自然科学基金高层次人才项目(423RC437)。

摘　　要：为了探究短期降水减少对不同土层有机碳矿化速率及其碳组分变化的影响,以海南典型人工林类型橡胶林土壤为研究对象,通过搭建野外隔离穿透雨控制平台,并结合室内恒温培养实验,测定了不同降水条件下土壤有机碳矿化速率及有机碳组分等参数。结果表明:短期降水减少导致0~10 cm土层中SOC累积矿化量、矿化率及微生物代谢熵(qCO_(2))显著降低;土壤易氧化有机碳(EOC)、微生物生物量碳(MBC)及惰性有机碳(NEOC)的含量均随土壤含水量的降低而降低,但仅对0~10 cm土层的EOC影响显著;相关分析表明,土壤SOC累积矿化量及SOC矿化率均与土壤碳氮含量(SOC、TN)、各碳组分含量(EOC、MBC、NEOC)、qCO_(2)呈显著正相关。总之,短期降水减少会抑制橡胶林土壤SOC的矿化,这一变化可能与不同水分条件下土壤基质供应的有效性及微生物代谢的变化有密切关系。In order to investigate the effects of short-term precipitation reduction on the changes of organic carbon mineralization rate and its carbon fractions in different soil layers,parameters such as soil organic carbon mineralization rate and organic carbon fractions under different precipitation conditions were determined by building a field isolated penetrating rain control platform and combining with indoor constant temperature incubation experiments using a typical plantation type of rubber forest soils in Hainan as the research object.The results showed that the short-term precipitation decreased the cumulative mineralization of SOC,the mineralization rate and the microbial metabolic entropy(qCO_(2))in the soil layer from 0 to 10 cm,and the contents of easily oxidizable organic carbon(EOC),microbial biomass carbon(MBC)and inert organic carbon(NEOC)decreased with the decrease of the soil water content,but the effect was only significant on the EOC in the soil layer from 0 to 10 cm.Correlation analysis showed that the cumulative mineralization of soil SOC and the mineralization rate of SOC were both significantly and positively correlated with soil carbon and nitrogen contents(SOC,TN),the contents of each carbon fraction(EOC,MBC,NEOC),and qCO_(2).In conclusion,short-term precipitation reduction inhibited the mineralization of SOC in rubber forest soils,and this change may be closely related to the effectiveness of soil substrate supply and changes in microbial metabolism under different moisture conditions.

关 键 词：橡胶林 土壤含水量 土壤有机碳组分 微生物代谢熵 

分 类 号：S714.2[农业科学—林学]