长期氮磷添加对热带季风次生林地上凋落物产量与分解速率的影响OA
Impacts of Long-term Nitrogen and/or Phosphorus Additions on Litterfall Production and Decomposition Rates in a Tropical Monsoon Secondary Forest
季风次生林是华南热带地区重要的生态系统,其凋落物产量与分解速率对长期氮(N)磷(P)添加的响应少见报道.该文报道了华南热带季风次生林长期NP添加实验样地12 a地上凋落物产量与4 a分解速率.试验设置了2因素(N添加与P添加)2 水平(添加与不添加),包含对照、单独添加N、单独添加P和同时添加NP共 4 个处理.结果表明,12 a间 4 个处理的地上凋落物总产量依次为(11544±1115)、(12649±1087)、(13694±1456)和(11761±712)g/m2.P添加显著提高了凋落物产量,N添加具有增加凋落物产量的趋势,N与P添加有显著交互作用,NP添加效应不随年份与季节变化.4 a间4个处理的分解速率常数依次为(1.44±0.07)、(1.76±0.09)、(2.10±0.10)和(1.81±0.08).P添加显著影响凋落物分解速率,N添加无显著作用,N与P添加不存在显著交互作用.长期P添加显著提高该生态系统的地上凋落物产量,长期N添加影响较弱,N与P添加有显著交互作用,NP添加效应不随处理时间与干湿季变化.地上凋落物分解主要受P限制,对N添加无响应.该研究揭示了长期NP添加对热带季风次生林地上凋落物产量与分解的影响,有助于理解该生态系统对养分有效性增加的长期响应机制.
Monsoon secondary forests are important ecosystems in tropical South China,but reports on their long-term response to nitrogen(N)and phosphorus(P)addition in terms of litter production and decomposition rates are scarce.This paper prbesents the results of a 12-year study on aboveground litter production and a 4-year study on decomposition rates in a long-term NP addition experiment in a tropical monsoon secondary forest in South China.The experiment employed a two-factor(N addition and P addition)and two-level(addition and no addition)design,including control,N-only addition,P-only addition,and combined NP addition treatments.The results showed that over 12 years,the total aboveground litter production for the four treatments was(11544±1115),(12649±1087),(13694±1456),and(11761±712)g/m2,respectively.P addition significantly increased litter production,while N addition showed a trend of increasing litter production.There was a significant interaction between N and P addition,and the effects of NP addition did not vary with year or season.During the 4-year decomposition rate study,the decomposition rate constants for the four treatments were(1.44±0.07),(1.76±0.09),(2.10±0.10),and(1.81±0.08),respectively.P addition significantly affected litter decomposition rates,while N addition had no significant effect,and there was no significant interaction between N and P addition.Long-term P addition significantly increased aboveground litter production in this ecosystem,while long-term N addition had a weak effect.There was a significant interaction between N and P addition,and the effects of NP addition did not change with treatment duration or dry/wet seasons.Aboveground litter decomposition was mainly limited by P,with no response to increased N availability.Therefore,it was suggested that the effects of long-term NP addition on aboveground litter production and decomposition in tropical monsoon secondary forests,contributing to the understanding of long-term response mechanisms of this ecosystem to increased nutrient availability.
李应文;陈碧云;余世钦;李泳兴;邹碧;庄萍;李志安;李慧;王法明
中国科学院华南植物园,广州 510650华南师范大学附属中学,广州 510630广东省科学院生态环境与土壤研究所,华南土壤污染控制与修复国家地方联合工程研究中心,广东省农业环境综合治理重点实验室,广州 510650中国科学院华南植物园,广州 510650中国科学院华南植物园,广州 510650中国科学院华南植物园,广州 510650中国科学院华南植物园,广州 510650广东生态工程职业学院,广州 510520中国科学院华南植物园,广州 510650
氮沉降磷限制凋落物分解碳循环土壤
Nitrogen depositionPhosphorus limitationLitter decompositionCarbon cycleSoil
《热带亚热带植物学报》 2026 (1)
11-20,10
国家自然科学基金项目(U2106209,32171594,32301398,42007230,42201057)国家重点研发计划项目(2023YFE0113100,2023YFF1304500,2021YFC3100400)广东省重点领域研究计划项目(2022B1111230001)中国科学院青年团队项目(YSBR-037)广东省基础和应用基础研究项目(2021B1515020011)中国科学院青促会项目(2021347)"一带一路"国家和国际科学组织联盟项目(ANSO-CR-KP-2022-11)广东省应用植物学重点实验室项目(2023B1212060046)中国科学院华南植物园项目(QNXM-01)资助 This work was supported by the National Natural Science Foundation of China(Grant No.U2106209,32171594,32301398,42007230,42201057),the National Key Research and Development Program of China(Grant No.2023YFE0113100,2023YFF1304500,2021YFC3100400),the Key Technologies R&D Program of Guangdong(Grant No.2022B1111230001),the Project for Young Scientists of CAS(Grant No.YSBR-037),the Project for Basic and Applied Basic Research in Guangdong(Grant No.2021B1515020011),the Project of Youth Innovation Promotion Association of CAS(Grant No.2021347),the Project of Alliance of National and International Science Organizations for the Belt and Road Regions(Grant No.ANSO-CR-KP-2022-11),the Project of Guangdong Provincial Key Laboratory of Applied Botany(Grant No.2023B1212060046),and the Project of South China Botanical Garden,Chinese Academy of Sciences(Grant No.QNXM-01).
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