摘要
以江西武夷山国家级自然保护区内海拔1 200、1 600和2 000 m的黄山松(Pinus taiwanensis Hayata)为研究对象,分别对6月份和9月份叶、茎和细根的全氮和全磷含量及其比值进行比较,并进行Pearson相关性分析和异速关系分析。结果表明:与6月份相比,9月份黄山松叶和细根的全氮含量以及细根的全磷含量均升高,而茎的全氮含量及叶的全磷含量却显著降低。从均值来看,全氮含量在叶中最高、在细根中最低,全磷含量在茎中最高、在细根中最低。随海拔升高,叶全氮含量逐渐升高,叶全磷含量及茎全氮和全磷含量呈"降低—升高"的趋势,而细根全氮含量呈"升高—降低"的趋势,细根全磷含量逐渐升高。Pearson相关性分析结果表明:细根全氮含量与叶全磷含量呈极显著负相关,与茎全氮和全磷含量呈显著负相关;茎全氮含量与叶全氮含量及茎和叶全磷含量,叶全氮含量与茎和叶全磷含量,细根全氮含量与其全磷含量,以及茎全磷含量与叶全磷含量均呈极显著正相关。氮磷异速关系分析结果表明:在6月份,叶和细根的氮磷异速指数随海拔升高而逐渐减小,而茎的氮磷异速指数则随海拔升高而逐渐增大;在9月份,叶的氮磷异速指数在海拔1 600 m最小,而茎和细根的氮磷异速指数则在海拔1 600 m最大。总体来看,不同月份和海拔黄山松各器官的氮磷异速关系均达到显著或极显著水平,并且,黄山松叶、茎和细根的氮磷异速指数均较高,分别为0.79、0.83和0.78。研究结果显示:不同月份和海拔黄山松各器官中氮和磷的分配差异明显。
Taking Pinus taiwanensis Hayata at altitudes of 1 200, 1 600, and 2 000 m in Wuyishan National Nature Reserve of Jiangxi Province as research object, total nitrogen and total phosphorus contents and their ratio in leaf,stem and fine root in June and September were compared, respectively, and Pearson correlation analysis and allometric relationship analysis were conducted. The results show that compared with June,in September,total nitrogen content in leaf and fine root, and total phosphorus content in fine root of P . taiwanensis increase,while total nitrogen content in stem and total phosphorus content in leaf decrease significantly. On the view of mean, total nitrogen content in leaf is the highest and the lowest in fine root, total phosphorus content in stem is the highest and the lowest in fine root. With increasing of altitude,total nitrogen content in leaf increases gradually, total phosphorus content in leaf and total nitrogen and total phosphorus contents in stem appear the trend of “ decreasing - increasing” , while total nitrogen content in fine root appears the trend of “ increasing-decreasing” , and total phosphorus content in fine root increases gradually. The result of Pearson correlation analysis shows that there is an extremely significantly negative correlation of total nitrogen content in fine root with total phosphorus content in leaf, and significantly negative correlations with total nitrogen and total phosphorus contents in stem. There are extremely significantly positive correlations of total nitrogen content in stem with total nitrogen content in leaf and total phosphorus content in stem and leaf, total nitrogen content in leaf with total phosphorus content in stem and leaf, total nitrogen content in fine root with its total phosphorus content, and total phosphorus content in stem with that in leaf. The results of analysis on allometric exponent between nitrogen and phosphorus show that in June, with increasing of altitude, allometric exponents between nitrogen and phosphorus in leaf and fine root decrease gradually, while that in stem increases gradually; in September, allometric exponent between nitrogen and phosphorus in leaf at altitude of 1 600 m is the smallest, while that in stem and fine root at altitude of 1 600 m is the largest. On the whole, allometric relationships between nitrogen and phosphorus in different organs of P. taiwanensis in different months and altitudes all reach the significant or extremely significant level. Besides, allometric exponents between nitrogen and phosphorus in leaf, stem, and fine root of P . taiwanensis are high with values of 0. 79, 0. 83 and 0.78,respectively. It is suggested that there are obvious differences in allocation of nitrogen and phosphorus in different organs of P. taiwanensis in different months and altitudes
出处
《植物资源与环境学报》
CAS
CSCD
北大核心
2017年第3期69-77,共9页
Journal of Plant Resources and Environment
基金
国家自然科学基金资助项目(31722007
31370589
31170374)
福建省青年拔尖人才支持计划
关键词
黄山松
全氮
全磷
月份
海拔
相关性分析
异速关系
Pinus taiwanensis Hayata
total nitrogen
total phosphorus
month
altitude
correlation analysis
allometric relationship
