毛竹扩张对杉木林土壤及杉木叶片氮磷化学计量特征影响

Effects of Phyllostachys edulis expansion on soil and leaf N,P stoichiometry in Cunninghamia lanceolata forests

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国家科技期刊平台
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中文摘要：为探讨毛竹(Phyllostachys edulis)扩张影响杉木(Cunninghamia lanceolata)生长的内在生态化学计量机制,采用空间代替时间的方法,在井冈山国家级自然保护区选取典型的毛竹-杉木林界面,沿扩张方向依次设置毛竹林、竹杉混交林和杉木林样地,分析样地内土壤、毛竹叶片、杉木新叶、成熟叶和落叶的氮(N)、磷(P)含量、N:P及叶片N、P回收度等指标.结果表明:(1)毛竹扩张提高土壤P含量,由 0.32 mg·g-1 上升到 0.43 mg·g-1,增幅达 32.6%;(2)毛竹扩张不改变杉木成熟叶的N:P,维持在 13.74,但使新叶的P含量上升,从而导致新叶N:P下降 21.3%,且使落叶的N:P由21.64下降到 18.69,降幅为 13.6%;扩张过程中毛竹自身叶片N、P含量及N:P变化无差异;(3)毛竹扩张对杉木叶片N、P 回收度不影响.以上说明,在毛竹向杉木林扩张过程中,毛竹自身具有较强的内稳态能力,并通过改变土壤 P 含量,促使杉木体内P含量及N:P计量失衡,这可能是杉木生长减缓或死亡的重要原因.

外文摘要：To reveal the ecological stoichiometry mechanism of Phyllostachys edulis expansion effects on the growth of Cunninghamia lanceolata individuals,this study analyzed the N,P concentration and N:P ratio of soil,P.edulis leaf and C.lanceolata leaf(young,mature and litter)in P.edulis-C.lanceolata mixed forest and its adjacent C.lanceolata forest and P.edulis forest by the methods of space-time substitution Jinggangshan National Nature Reserve.The results showed that(1)the soil P concentration was increased by 32.6%,from 0.32 mg·g-1 in the C.lanceolata forest to 0.43 mg·g-1 in P.edulis-C.lanceolata mixed forest.(2)N:P ratio in the mature leaf of C.lanceolata had no variations(13.74)in the three types of forests.However,the P concentration of young leaf was increased,leading to a fall of the N:P ratio by 21.3%.N:P ratio in litters was descended by 13.6%,from 21.64 to 18.69.There was no difference in the leaf N,P concentration and N:P ratio of P.edulis during the expansion process.(3)P.edulis expansion had no significant influences on leaf N and P resorption proficiency of C.lanceolata.These findings indicate that P.edulis has a strong homeostasis ability,and P.edulis expansion can prevent the growth or even cause the death of C.lanceolata by altering the soli P concentration and thus unbalancing the P content and N:P stoichiometry in C.lanceolata.

外文关键词：

plant expansionCunninghamia lanceolataecological stoichiometryhomeostasisresorption proficiencyJinggangshan National Nature Reserve

作者：

宋述望、欧阳明、刘骏、宋庆妮、方熊、栾丰刚、杨清培

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作者单位：

江西农业大学林学院, 江西省竹子种质资源与利用重点实验室, 南昌 330045

北京大学城市与环境学院/地表过程分析与模拟教育部重点实验室, 北京 100871

江西农业大学国土资源与环境学院, 南昌 330045

关键词：

植物入侵杉木生态化学计量学内稳态回收度井冈山国家级自然保护区

基金：

国家自然科学基金国家自然科学基金国家自然科学基金国家自然科学基金江西省"千人计划"引进类创新领军人才长期青年项目

项目编号：

32060319418070283146007732360801jxsq2020101079

出版年：

2024

DOI：

10.14108/j.cnki.1008-8873.2024.02.001

生态科学

广东省生态学会暨南大学

生态科学

CSTPCD北大核心

影响因子：0.464

ISSN：1008-8873

年,卷(期)：2024.43(2)

参考文献量41