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模拟氮沉降对川中丘陵区柏木人工林养分限制特征的影响

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氮(N)和磷(P)是限制森林生态系统植被生长和生产力增长的两种主要营养物质.全球变化背景下,土壤N、P供应平衡对于森林生态系统结构和功能稳定性的维持至关重要,相关研究一直是森林生态学的研究前沿和热点.以亚热带川中丘陵区柏木人工林为研究对象,通过野外N添加模拟大气N沉降,从柏木叶片养分及生理特征和土壤生态酶化学计量地上-地下相结合的角度探讨N添加下该区域柏木人工林生长以及微生物代谢的养分限制状况.结果表明:(1)N添加显著降低了叶片P含量,降低幅度为13.84％,叶片N、P从对照的15.03上升到了16.30;(2)N添加显著升高了叶片P养分回收效率(PRE),升高幅度为19.90％,显著降低了叶片N∶P养分回收效率比(NRE/PRE),降幅为17.28％,NRE/PRE＜1;(3)N添加显著降低了叶片代谢P占比,降幅为17.96％,以上结果均表明N添加增强了柏木生长的P养分限制;(4)N添加显著降低了根际土壤胞外酶N∶P(EEAN∶P),降幅为8.99％,降低了土壤胞外酶C∶P(EEAC∶P),显著升高了胞外酶矢量角度(＞45°),增幅为5.73％.因此,川中丘陵区柏木人工林树木生长以及根际土壤微生物代谢在N添加后受到P养分限制;该结果有助于揭示N添加下区域生态系统土壤微生物代谢和养分循环特征和促进全球变化背景下区域人工林的科学管理.(图5表1参61)
Effects of simulated nitrogen deposition on the characteristics of nutrient limitation in the Cupressus funebris plantation in hilly area of central Sichuan
Nitrogen(N)and phosphorus(P)are two dominant nutrients that limit terrestrial plant productivity.In the context of global climate change,the balance between the supply of soil N and P is critical for the structural and functional stability of forest ecosystems.Therefore,the maintenance of structural and functional stability and the mechanism of nutrient regulation in forest ecosystems in the background of nitrogen(N)deposition have been research frontiers and hotspots in forest ecology.We used a Cupressus funebris plantation in the hilly area of central Sichuan in China as the research object,simulated N deposition by the addition of N,and studied the nutrient limitation characteristics of Cupressus funebris growth and microbial metabolism from above-and belowground perspectives of foliar nutrient characteristics,foliar physiological characteristics,and extracellular enzyme stoichiometry.Results showed that:(1)N addition significantly decreased the foliar P concentration,whose degree of decrease was 13.84％,and foliar N∶P ratio increased from 15.03 in the control to 16.30;(2)the addition of N significantly resulted in an increase in foliar phosphorus resorption efficiency(PRE)by 19.90％,made a significant decrease in foliar NRE/PRE ratio by 17.28％,and made foliar NRE/PRE ratio less than 1;(3)N addition also significantly made a decrease in the percentage of foliar metabolic P by 17.96％,and increased the foliar acid phosphatase activity,the above results showed that the addition of N enhanced the P nutrient limitation of Cupressus funebris;(4)The addition of N significantly had a decrease in the extracellular enzyme N∶P(EEAN∶P)by 8.99％,decreased the extracellular enzyme C∶P,and significantly made an increase in the extracellular enzyme vector angle(more than 45°)by 5.73％in rhizosphere soil.Therefore,N addition limits the growth of Cupressus funebris and rhizosphere microbial metabolism is limited by P in the hilly areas of central Sichuan.This study could be important for illuminating the soil microbial metabolism and nutrient cycling of the Cupressus funebris plantation in the hilly area of central Sichuan,and could also provide a theoretical basis for the scientific management of plantations in the context of global changes.

N additionnutrient limitationnitrogen and phosphorus stoichiometryextracellular enzyme stoichiometryhilly area of central SichuanCupressus funebris plantation

景卫、彭修涛、周雪芹、刘榕、肖肖、肖娟

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西华师范大学环境科学与工程学院 南充 637002

四川省南充生态环境监测中心站 南充 637007

N添加 养分限制 氮磷化学计量 胞外酶化学计量 川中丘陵区 柏木人工林

国家自然科学基金项目四川省科技厅科技计划项目省级大学生创新创业训练项目西华师范大学校级创新团队资金

317003872021YJ0283S202210638049KCXTD2024-3

2024

10.19675/j.cnki.1006-687x.2023.09020

应用与环境生物学报
中国科学院成都生物研究所

应用与环境生物学报

CSTPCD北大核心
影响因子：0.972
ISSN：1006-687X
年,卷(期)：2024.30(4)
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