生态学杂志2025，Vol.44Issue(8)：2506-2514,9.DOI:10.13292/j.1000-4890.202508.033
荒漠-绿洲过渡带不同土地利用类型下土壤有机碳矿化特征及其对氮添加的响应
Soil organic carbon mineralization characteristics under different land use types in desert-oasis transition zone and its response to nitrogen addition
摘要
Abstract
We explored the mineralization potential of soil organic carbon(SOC)between two land use types,shrubland and cropland,in the southern edge of the desert-oasis transition zone in hyper-arid area of the Taklama-kan Desert,and analyzed the response mechanism to nitrogen(N)addition.Adjacent uncultivated desert land was used as a control.NH4Cl was used as the N source.The SOC mineralization rate and cumulative SOC mineralization were measured in an incubation experiment in the laboratory.The regulatory factors of SOC mineralization including the microbial community composition and enzyme activities related to carbon and N cycling were explored.The re-sults showed that land use types had a significant impact on the cumulative mineralization of SOC.The cumulative mineralization of SOC in cropland and shrubland were significantly higher than those in uncultivated desert land(P＜0.05).The mineralization rate of SOC peaked on the 1st or 3rd day,and then gradually decreased with the exten-sion of incubation time.The cumulative mineralization of SOC was significantly negatively correlated with soil dis-solved organic N,ammonium,and nitrate,but positively correlated with pH(P＜0.05).Redundancy analysis showed that 95.02％of the variation of SOC mineralization was explained by enzyme activity and microbial commu-nity composition,and fungi to bacteria ratio.Gram-positive bacteria and actinomyces abundances exerted the grea-test impact on SOC mineralization.Nitrogen addition delayed the occurrence time of the maximum of soil mineraliza-tion rate in shrublands and uncultivated desert lands,but did not affect soil microbial community composition and SOC cumulative mineralization.These findings indicate that the reclamation of desert lands into shrublands and croplands can increase SOC mineralization,with nutrient availability playing an important role in this process.关键词
土壤有机碳矿化/土地利用类型/氮添加/酶活性/微生物群落组成Key words
soil organic carbon mineralization/land use type/nitrogen addition/enzyme activity/microbial com-munity composition引用本文复制引用
宋佼阳,赵广兴,丛孟菲,张志浩,曾凡江..荒漠-绿洲过渡带不同土地利用类型下土壤有机碳矿化特征及其对氮添加的响应[J].生态学杂志,2025,44(8):2506-2514,9.基金项目
国家重点研发计划(2022YFF1302504)、国家自然科学基金面上项目(42271071)、天山英才创新领军人才计划(2023TSYCLJ0046)资助. （2022YFF1302504）
