舒锟, 李西悦, 刘选茹, 柳奇, 杨林凯, 陈良华. 杉木人工林土壤碳、氮、磷化学计量特征对短期氮添加的响应[J]. 云南大学学报(自然科学版), 2022, 44(4): 840-851. doi: 10.7540/j.ynu.20220081
引用本文: 舒锟, 李西悦, 刘选茹, 柳奇, 杨林凯, 陈良华. 杉木人工林土壤碳、氮、磷化学计量特征对短期氮添加的响应[J]. 云南大学学报(自然科学版), 2022, 44(4): 840-851. doi: 10.7540/j.ynu.20220081
SHU Kun, LI Xi-yue, LIU Xuan-ru, LIU Qi, YANG Lin-kai, CHEN Liang-hua. Responses of stoichiometrical characteristics of C, N, and P in soils under short-term nitrogen addition in two Cunninghamia lanceolata plantations[J]. Journal of Yunnan University: Natural Sciences Edition, 2022, 44(4): 840-851. DOI: 10.7540/j.ynu.20220081
Citation: SHU Kun, LI Xi-yue, LIU Xuan-ru, LIU Qi, YANG Lin-kai, CHEN Liang-hua. Responses of stoichiometrical characteristics of C, N, and P in soils under short-term nitrogen addition in two Cunninghamia lanceolata plantations[J]. Journal of Yunnan University: Natural Sciences Edition, 2022, 44(4): 840-851. DOI: 10.7540/j.ynu.20220081

杉木人工林土壤碳、氮、磷化学计量特征对短期氮添加的响应

Responses of stoichiometrical characteristics of C, N, and P in soils under short-term nitrogen addition in two Cunninghamia lanceolata plantations

  • 摘要: 阐明短期氮添加对杉木(Cunninghamia lanceolata)人工林土壤化学特征的影响,可为杉木人工林的氮素管理提供科学依据. 以11 a和18 a两个年龄杉木人工林的林地土壤为研究对象,在每个林龄林地中随机布设9个400 m2的标准样地,设置0、5、10 g/(m2·a) 3个氮添加水平,每个氮添加水平包含3个重复样地. 2019年4月—11月,每月中旬对各样地进行NH4NO3添加处理. 在生长季和非生长季,研究林地不同深度(0~20 cm和20~40 cm)土壤中速效氮、总有机碳、全氮、全磷质量比特征及其化学计量比对氮添加的响应. 短期氮添加增加了2个林龄林地土壤的硝态氮质量比,并表现出累积效应. 与18 a相比,11 a杉木林土壤硝态氮质量比上升幅度更大. 短期氮添加一定程度增加了两个林龄林地土壤的总有机碳、全氮和全磷质量比,高氮添加显著增加了11 a杉木林表层土壤(0~20 cm)的总有机碳和全氮质量比. 与深层土壤(20~40 cm)相比,表层土壤的变化更明显. 2个林龄林地土壤的碳、氮、磷化学计量比受短期氮添加的影响较小,主要受到土层和季节的影响. 总体来看,11 a杉木林土壤的速效氮养分质量比和碳、氮、磷化学计量特征对短期氮添加更敏感.

     

    Abstract: In order to reveal effects of short-term nitrogen (N) addition on stoichiometrical characteristics of C, N, and P in soils, which can provide a basis for guidance of N management in Cunninghamia lanceolata plantations, two Chinese fir plantations with different ages, i.e., 11 and 18 years old, were used as models to study responses of stoichiometrical characteristics of C, N, and P in soils to N addition. In each plantation, we randomly set 9 plots with an area of 400 m2 in each plot. Three regimes of N addition, i.e., control (CK, 0 g/(m2·a)), low-nitrogen (LN, 5 g/(m2·a)) and high-nitrogen (HN, 10 g/(m2·a)), were deployed in each C. lanceolata plantation. Every N regime included 3 replicated plots. From April to November in 2019, NH4NO3 as additional N source was sprayed in the plots monthly. In both growing season and non-growing season, soils in two layer depths (0−20 cm and 20−40 cm) were sampled. Soil properties including contents of available inorganic N, total organic C (SOC), total N, and total P, and their stoichiometrical ratio were analyzed to determine the impact of short-term N addition on stoichiometrical characteristics of C, N, and P in soils. N addition increased N-NO3 content in soils of both C. lanceolata plantations, and induced accumulation of N-NO3 in soils with the increase of N addition. The increase of N-NO3 in soils of 11 years plantation was more significant than that of 18 years plantation under the corresponding N regime. Under N addition, concentrations of SOC, N, and P in soils of both C. lanceolata plantations increased to varying degrees. Such increases in upper layer soil depth (0−20 cm) were more obvious than those in deeper layer soil depth (20−40 cm). There was no significant alteration in stoichiometrical ratio of C, N, and P under short-term N addition in both plantations, which was affected by season and soil layer depth significantly. Available N nutrients and soil stoichiometrical characteristics of C, N, and P were more responsive in 11 years C. lanceolata plantation under short-term N addition, when compared to those in 18 years C. lanceolata plantation.

     

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