| 不同林龄云南松针叶养分回流及利用效率的季节变化 |
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| 引用本文： | 管国伟,陈鹏,惠阳,廖周瑜,王邵军.不同林龄云南松针叶养分回流及利用效率的季节变化[J].西部林业科学,2021(1). |
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| 作者姓名： | 管国伟 陈鹏 惠阳 廖周瑜 王邵军 |
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| 作者单位： | 西南林业大学生态与环境学院;云南省林业和草原科学院 |
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| 基金项目： | 云南省应用基础重点项目(2013FA055);国家自然科学基金(31660191)。 |
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| 摘 要： | 以云南玉溪森林生态系统定位研究站内不同林龄(15、30和45 a)云南松为对象,通过1 a的定位观测,对不同林龄云南松的养分回流及利用效率特征进行了分析,以期为深入揭示云南松养分自我保持机制及云南松林地的养分管理提供科学依据。结果表明:(1)云南松针叶中养分元素含量夏秋季相对较高,而冬季相对较低,N元素含量随林龄增加而减少,其它元素则以45 a含量相对较高,30 a含量相对较低,总体上,各林龄养分元素平均含量从高到低为Ca、N、K、Mg、P。(2)各林龄云南松针叶中N、P、K在不同季节中均有明显的回流,回流率随林龄及季节的变化而差异明显,大多在冬季的回流率相对较高;Ca元素则在各林龄各季中出现富集,富集率随林龄增加而增大;Mg元素除45 a在春秋冬季中有少量回流外,其它林龄及季节则均出现富集。(3)各林龄N、P、K的利用效率在冬季较高,而Ca、Mg的利用效率则在秋季较高,利用效率随林龄及季节的变化而变化明显。结果显示,各林龄对养分元素的平均回流率从大到小为K、P、N、Mg、Ca,平均利用效率从高到低为P、K、Mg、N、Ca,养分元素的回流率及利用效率与养分元素含量呈显著负相关关系。云南松针叶对N、P、K保持较高的回流率和利用效率,表明云南松对贫瘠低磷环境具有较强的适应能力,是贫瘠低磷环境下造林的优良树种。
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| 关 键 词： | 云南松 养分回流 养分利用效率 动态特征 |
Seasonal Variations of Nutrient Return and Nutrient Use Efficiency of the Needles of Pinus yunnanensis with Different Ages |
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| GUAN Guo-wei,CHENG Peng,HUI Yang,LIAO Zhou-yu,WANG SHao-jun.Seasonal Variations of Nutrient Return and Nutrient Use Efficiency of the Needles of Pinus yunnanensis with Different Ages[J].Journal of West China Forestry Science,2021(1). |
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| Authors: | GUAN Guo-wei CHENG Peng HUI Yang LIAO Zhou-yu WANG SHao-jun |
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| Institution: | (College of Ecological and Environment,Southwest Forestry University,Kunming Yunnan 650224,P.R.China;Yunnan Academy of Forestry and Grassland,Kunming Yunnan 650201,P.R.China) |
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| Abstract: | Taking different forest ages(15 a,30 a and 45 a)of Pinus yunnanensis in Yuxi Forest Ecosystem Positioning Research Station of Yunnan Province as objects,the dynamic characteristics of nutrient return and use efficiency of P.yunnanensis with different forest ages were studied through one year localization observation,for provided a scientific basis for further revealing the mechanism of nutrient self-preservation and the nutrient management of P.yunnanensis forest land.The results showed that:(1)the content of nutrient elements in needles of P.yunnanensis is relatively higher in summer and autumn,but relatively lower in winter.The content of N elements decreases with the increase of forest age,while the content of other elements is relatively higher in 45a and relatively lower in 30 a.As a whole,the average content of nutrient elements in each forest age was a order of Ca,N,K,Mg and P.(2)There was a significant nutrient return of N,P and K in the needles of P.yunnanensis in different forest-ages and seasons,most of them had a relatively higher return rate in winter;the Ca element was enriched in each season,and the enrichment rate increased with the increase of the age of the forest;the Mg element was enriched in the other age and the season except for 45 a has a small amount of nutrient return in spring,autumn and winter.(3)the use efficiency of N,P,K was higher in winter,while the use efficiency of Ca and Mg was higher in autumn and the use efficiency changed obviously with the change of forest age and season.On the whole,the average return rate of nutrient elements for each forest age was in a order of K,P,N,Mg and Ca from high to low,average use efficiency was P,K,Mg,N,Ca,there was a significant negative correlation between the return rate,use efficiency of nutrient elements and the content of nutrient elements.The needles of P.yunnanensis maintained higher return rate and use efficiency to P,N and K,which indicated that P.yunnanensis had stronger adaptability to barren and lower phosphorus environment and was an excellent tree species for afforestation in these environment. |
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| Keywords: | Pinus yunnanensis nutrient return nutrient use efficiency dynamic characteristics |
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