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板栗细根碳、氮、磷化学计量时间变异特征 预览

Temporal variation of C, N, P stoichiometric in fine roots of Castanea mollissima
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摘要 【目的】探讨生长季内板栗(Castanea mollissima)细根碳(C)、氮(N)、磷(P)化学计量特征,为有针对性地培育板栗,提高有效经济产量提供理论依据。【方法】以河北省迁西县北京林业大学经济林(板栗)育种与栽培实践基地6年生板栗树为研究对象,在生长季内(4—10月份)采用连续根钻法(内径为8 cm),分别在距树干50 cm和100 cm的不同土层(0—20 cm、20—40 cm和40—60 cm)处取样,分析计算了不同空间分布上板栗细根C、N、P的化学计量特征。【结果】板栗细根C、N、P含量的均值分别为382.01 g/kg、7.99 g/kg和1.06g/kg,C/N、C/P和N/P均值分别为50.48、377.35和7.62。在生长季中,板栗细根C、C/N、C/P在6—9月份基本维持在较高水平且6月份最大,而N和P在6月份含量相对较少,在4月份达到最大值,N/P则在生长季末达到最大值。板栗细根C、N、P含量在空间上也表现出差异。C含量在20—40 cm最多。这一土层中,距树干50 cm和100 cm处,C含量的最大值分别出现在7月份和6月份,生长季C含量分别增加了26.82 g/kg和11.84 g/kg。N和P含量在0—20 cm最多。这一土层中,距树干50 cm处,N含量在4月份最高,P含量7月份最高,生长季N含量和P含量分别减少了1.39 g/kg和0.60 g/kg。距树干100 cm处,N含量在4月份最高,P含量8月份最高,生长季N含量和P含量分别减少了2.91 g/kg和0.56 g/kg。整体变异分析表明,板栗细根N、C/N、C/P、N/P受不同月份的影响最大,C、P受不同土层深度的影响最大,距树干距离因素的影响是最小的。通过对N、P含量和N/P比值的分析可知,该地区板栗生长受到N、P共同限制,且更易受到N限制。【结论】板栗细根C、N、P及其化学计量比在时间和空间上差异显著,其受到的影响因素不同。在进行水肥管理时,应根据不同时间和空间上板栗细根的特征进行合理的管理,并充分考虑N、P含量尤其是N含量的限制。 【Objectives】This study explored the C, N, P stoichiometry characteristics of fine roots of Castanea mollissima to provide a theoretical basis about targeted cultivation and high yield.【Methods】Investigation was carried out in the Chestnut(Castanea mollissima) Breeding and Cultivation Base of Department of Economic Forest, Beijing Forest University, located in Qianxi County, Hebei Province. The plantation was six-years-old.During the growing season(April to October), soil samples were collected at 0–20 cm, 20–40 cm and 40–60 cm depth, and 50 cm and 100 cm away from tree trunks at monthly frequency. The number of fine roots in different soil layers and the C, N and P contents of the fine roots were determined. The dynamics and spatial distribution characteristics of carbon(C), nitrogen(N) and phosphorus(P) stoichiometry characteristics were studied.【Results】The annual mean values of C, N and P contents of the fine roots were 382.01 g/kg, 7.99 g/kg and 1.06 g/kg, respectively, with corresponding C/N, C/P, and N/P ratios of 50.48、377.35 and 7.62 respectively. The C contents, the C/N and C/P ratios were maintained high from June to September, especially in June. The contents of N and P were highest in April and lowest in June, the N/P ratio reached top in the end of growing season.The maximum C content was found at 20–40 cm depth, that in July was appeared at 50 cm away and in June at100 cm away from chestnut tree trunk, with the season increment of 26.82 g/kg and 11.84 g/kg respectively. N and P were mainly concentrated in soil layer of 0–20 cm, the maximum N and P contents were all founded at the 50 cm away and appeared in April for N and in July for P. And the soil N and P contents were decreased by1.39 g/kg and 0.60 g/kg respectively during the growing period. At soil 100 cm away from tree trunks, the highest soil N was appeared in April and the highest P content in August, and the seasonal decrement of soil N and P contents were 2.91 g/kg and 0.56 g/kg respectively. The
作者 郭素娟 谢明明 张丽 孙慧娟 宋影 GUO Su-juan, XIE Ming-ming, ZHANG Li, SUN Hui-juan, SONG Ying ( Key Laboratory for Silviculture and Conservation, Ministry of Education, Beijing Forestry University, Beijing 100083, China )
出处 《植物营养与肥料学报》 CSCD 北大核心 2018年第3期825-832,共8页 Plant Nutrition and Fertilizer Science
基金 国家林业公益性行业科研专项重大项目(201204401) “十二五”国家科技支撑计划项目(2013BAD14B0402)资助
关键词 板栗 细根 化学计量 时间变异 Castanea mollissima fine root carbon nitrogen phosphorus stoichiometry temporal variation
作者简介 郭素娟Tel:010—62338187,E—mail:gwangzs@263.net
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