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复层异龄混交改造对杉木人工林土壤磷组分和转化的影响

Effects of Multi-layer Mixed age Modification on Soil Phosphorus Components and Transformation in Cunninghamia lanceolata Plantation
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摘要 为探究杉木(Cunninghamia lanceolata)人工林引入阔叶树种进行复层异龄混交改造对土壤磷(P)组分和转化的影响,本研究以未改造的杉木纯林(PP)和复层异龄混交改造后的杉木混交林(MP)作为研究对象,分析土壤理化性质和土壤P组分,并采用高通量测序和96孔荧光微孔板法分别测定土壤微生物群落组成和酶活性,阐明它们之间的关系。结果表明:(1)与PP相比,MP的极易利用性磷(RP)、易利用性磷(LP)、中等程度利用性磷(MAP)和难利用性磷(OP)分别显著提高9.43%、9.20%、11.64%和11.71%,磷素活化系数(PAC)显著提高27.13%。(2)MP中微生物生物量碳(MBC)、微生物生物量氮(MBN)和微生物生物量磷(MBP)较PP分别极显著增加13.52%、31.11%和55.78%,MP的微生物共现网络节点数、边数和平均加权度均高于PP。(3)和PP相比,MP中与碳(C)代谢相关的β葡萄糖苷酶(BG)和纤维二糖水解酶(CB)土壤酶活性分别增加175.58%(P<0.01)和21.81%(P<0.05),与氮(N)代谢相关的N乙酰葡萄糖苷酶(NAG)土壤酶活性增加113.30%(P<0.001),与P代谢相关的酸性磷酸酶(ACP)土壤酶活性增加71.49%(P<0.01),C、N和P代谢酶活性之间均呈显著的正相关关系。(4)土壤有机碳(SOC)、全氮(TN)和细根生物量(FR)是驱动土壤P组分发生变化的主要因子。综上,复层异龄混交改造可以通过影响植物性质和土壤的理化性质,提高土壤中各P组分含量和与土壤C、N和P相关的代谢酶活性,并在一定程度上有效促进杉木人工林土壤P的转化,提高其可利用性。该策略将为有效缓解亚热带杉木人工林土壤P限制提供新途径。 The purpose of this study was to investigate the effects of multi layer mixed age introduction of broad leaved tree species into Cunninghamia lanceolata plantation on soil Phosphorus(P)components and transformation.The soil physicochemical properties and P components were measured in the unmodified Pure C.lanceolata Plantation(PP)and the Mixed C.lanceolata Plantation(MP)after multi layer mixed age modification.The soil microbial community composition and enzyme activity were determined by high throughput sequencing and 96 well plate,respectively.Furthermore,the relationship of soil physicochemical properties and P components with soil microbial community and enzyme activity was clarified.The results showed that:(1)Compared with those in PP,the Resin Phosphorus(RP),Labile Phosphorus(LP),Medium Availability Phosphorus(MAP)and Oculude Phosphorus(OP)in MP were significantly increased by 9.43%,9.20%,11.64%and 11.71%,respectively,and the Phosphorus Activation Coefficient(PAC)was significantly increased by 27.13%.(2)The Microbial Biomass Carbon(MBC),Microbial Biomass Nitrogen(MBN)and Microbial Biomass Phosphorus(MBP)in MP significantly increased by 13.52%,31.11%and 55.78%,respectively,compared with those in PP.The number of nodes,the number of edges and the average weighting degree of the microbial co occurrence network in MP were higher than those in PP.(3)Compared with PP,MP increased the activities ofβGlucosidase(BG)and Cellobiohydrolase(CB)related to Carbon(C)metabolism by 175.58%(P<0.01)and 21.81%(P<0.05),the activity of N Acetyl Glucosylase(NAG)related to Nitrogen(N)metabolism by 113.30%(P<0.001),and the activity of Acid Phosphatase(ACP)involved in P metabolism by 71.49%(P<0.01).There were significant positive correlations between the activities of enzymes associated with C,N and P metabolism.(4)Soil Organic Carbon(SOC),Total Nitrogen(TN)and Fine Root Biomass(FR)were the main factors driving the changes of soil P components.In conclusion,multi layer mixed age modification promotes soil P transformation and improves P availability in C.lanceolata plantation by altering the plant and soil physicochemical properties and increasing the content of P components and activities of enzymes involved in soil C,N and P metabolism.This approach may pave a new way for the alleviation of soil P limitation in subtropical C.lanceolata plantation.
作者 李昌航 高冠女 黄海梅 李佳君 肖纳 廖树寿 黄雪蔓 招礼军 尤业明 LI Changhang;GAO Guannü;HUANG Haimei;LI Jiajun;XIAO Na;LIAO Shushou;HUANG Xueman;ZHAO Lijun;YOU Yeming(Guangxi Key Laboratory of Forest Ecology and Conservation,Guangxi Colleges and Universities Key Laboratory for Cultivation and Utilization of Subtropical Forest Plantation,College of Forestry,Guangxi University,Nanning,Guangxi,530004,China;Guangxi Zhuang Autonomous Region Hechi Eco Environmental Monitoring Centre,Hechi,Guangxi,547003,China;Experiment Center of Tropical Forestry,Chinese Academy of Forestry,Pingxiang,Guangxi,532600,China;Guangxi Youyiguan Forest Ecosystem National Research Station,Youyiguan Forest Ecosystem Observation and Research Station of Guangxi,Pingxiang,Guangxi,532600,China)
出处 《广西科学》 CAS 北大核心 2024年第3期416-426,共11页 Guangxi Sciences
基金 国家自然科学基金(31960240,32171755) 广西自然科学基金(2019GXNSFAA185023) 崇左凭祥友谊关森林生态系统广西野外科学观测研究站科研能力建设项目(桂科2203513003)资助。
关键词 杉木人工林 土壤磷组分 微生物生物量 土壤酶活性 共现网络分析 Cunninghamia lanceolata plantation soil phosphorus components microbial biomass soil enzyme activity co occurrence network analysis
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