摘要
为量化不同覆盖作物种植模式对茶园土壤酶活性及有机碳矿化特征的影响,以湖北省十堰市郧阳区谭家湾茶园为研究对象开展覆盖作物多样性试验,设置四种覆盖作物种植模式:无覆盖作物(A0)、2种覆盖作物(A1)、4种覆盖作物(A2)、8种覆盖作物(A3),测定茶园0~20 cm和20~40 cm土层的土壤酶活性、有机碳矿化速率以及累积矿化量,并对其进行一级动力学方程拟合,得出有机碳潜在矿化势(C_p)和矿化常数(k)。结果发现,覆盖作物种植小区的土壤酶活性均高于对照小区,0~20 cm土层的酶活性均高于20~40 cm,不同覆盖作物类型对土壤过氧化氢酶和脲酶活性的影响具有显著差异(P<0.05),但对土壤磷酸酶没有显著影响。与过氧化氢酶相比,土壤脲酶、磷酸酶是更重要的土壤碳循环参与者,其活性与有机碳矿化作用之间呈极显著正相关关系(P<0.01),在土壤有机碳分解转化过程中具有重要作用。各处理的土壤有机碳矿化速率均呈现先升高后降低最后趋于平稳的趋势,0~20 cm土层的土壤有机碳矿化速率和累积矿化量均高于20~40 cm土层。0~20 cm土层C_p/k表现为A1>A2>A3>A0,20~40 cm土层C_p/k表现为A1>A2>A0>A3,两土层均以A1的土壤有机碳矿化作用最强。A1的微生物量碳和可溶性有机碳均高于其他处理,为作物生长发育提供了充足的养分,pH值也最高,有利于阻抗土壤酸化。
The aim of this study was to quantify the effects of different mulch planting patterns on soil enzyme activity and organic carbon mineralization in a tea plantation.The cover crop diversity experiment was conducted in the Tanjiawan tea garden,Yunyang District,Shiyan City,Hubei Province.Four cover crop planting modes were set up,namely no crop cover(A0),two cover crops(A1),four cover crops(A2),and eight cover crops(A3).The enzyme activity,organic carbon mineralization rate,and cumulative mineralization of the 0~20 cm and 20~40 cm soil layers in the tea plantation were measured,and the data was fitted to the first order kinetic equation to obtain the mineralization potential(C_p)and mineralization constant(k)of organic carbon.The results showed that,the soil enzyme activity in the mulch plot was generally higher than that in the control plot,and the enzyme activity in the 0~20 cm soil layer was higher than that in the 20~40 cm layer.Different mulch types had significant effects on soil catalase and urease activity(P<0.05),but no significant effect on soil phosphatase.Compared with catalase,soil urease and phosphatase were more important participants in the soil carbon cycle,and there was a significantly positive correlation between their activities and organic carbon mineralization(P<0.01),showing that they play an important role in the decomposition and transformation of soil organic carbon.The organic carbon mineralization rates of all treatments showed a trend of first increasing,then decreasing,and finally stabilizing.The mineralization rate and cumulative amount of organic carbon in the 0~20 cm soil layer were higher than those in the 20~40 cm soil layer.In the 0~20 cm soil layer,the Cp/k value was as follows:A1>A2>A3>A0.In the20~40 cm soil layer,the C_p/k value was as follows:A1>A2>A0>A3.This suggests that the organic carbon mineralization of A1 was the strongest in both soil layers.Moreover,the microbial biomass carbon and soluble organic carbon of A1 were higher than those of the other treatments,thereby providing sufficient nutrients for crop growth and development.A1 had the highest pH value,which was conducive to soil acidification.
作者
汪洋
杨殿林
王丽丽
沈晓琳
赵建宁
王慧
黄进
张小福
WANG Yang;YANG Dian-lin;WANG Li-li;SHEN Xiao-lin;ZHAO Jian-ning;WANG Hui;HUANG Jin;ZHANG Xiao-fu(Agro-Environmental Protection Institute,Ministry of Agriculture and Rural Affairs,Tianjin 300191,China;Key Laboratory of Origin Environmental Pollution Prevention and Control,Ministry of Agriculture and Rural Affairs/Tianjin Key Laboratory of Agro-environment and Agro-product Safety,Tianjin 300191,China;Tea Research Institute,Shiyan Academy of Agricultural Sciences,Shiyan 442000,Chi na;Economic Crop Research Institute of Shiyan City,Shiyan 442714,China)
出处
《农业资源与环境学报》
CAS
北大核心
2020年第3期371-380,共10页
Journal of Agricultural Resources and Environment
基金
中国农业科学院科技创新工程协同创新任务(CAAS-XTCX2016015)
中央级公益性科研院所基本科研业务费专项(2020-szjj-zjn)。
关键词
覆盖作物
酶活性
有机碳矿化
一级动力学方程
cover crops
enzyme activity
organic carbon mineralization
first order dynamic equation
