生态茶园植物残体分解过程养分与能量变化动态OA
Nutrient and energy dynamics during the decomposition of plant residues in ecological tea plantations
茶(Camellia sinensis)修剪物及配置树种凋落物是茶园生态系统的重要组成部分,其分解过程与土壤养分密切相关,在调控茶园生态系统养分循环和能量流动中起着关键作用.采用分解网袋法,对黔中生态茶园茶修剪物以及配置树种猴樟(Cinnamom glanduliferum)、亮叶桦(Betula luminifera)、杉木(Cunninghamia lanceolata)、马尾松(Pinus massoniana)的植物残体在土壤中分解的养分变化及能量流动过程进行研究.结果表明:茶园中阔叶树种植物残体分解速度明显快于针叶树种,具体表现为亮叶桦＞猴樟＞茶修剪物＞马尾松＞杉木;5种植物残体的全碳、全氮及热值均表现为直接释放;全磷在亮叶桦中表现为直接释放,而在猴樟和马尾松中则表现为富集模式;全钾在阔叶树种以及杉木植物残体中表现为直接释放,只有马尾松植物残体在分解后期(360天)富集;5种植物残体的木质素总体上呈现为净富集;此外,植物残体在分解过程中热值的释放与全碳、全氮及全钾的释放呈显著正相关(P＜0.05).总体而言,5种植物残体分解过程中,亮叶桦的分解速率最快,其养分归还以及能量释放能力表现最优;养分释放显著影响热值的释放,尤其是碳元素和氮元素.研究结果揭示了茶园生态系统的物质循环与能量流动特征,为贵州山区生态茶园的植物配置及植物残体的合理利用提供了科学依据.
The pruning residues of Camellia sinensis and the litter of associated tree species are crucial components of tea gardens,the decomposition processes of which are closely related to soil nutrients and thus play a significant role in regulating nutrient cycling and energy flow.Using the litterbag decomposition method,we investigated the nutrient changes and energy flow processes during the decomposition of pruning residues from Camellia sinensis and associated tree species,including Cinnamomum glanduliferum,Betula luminifera,Cunninghamia lanceolata,and Pinus massoniana,in the central Guizhou ecological tea garden.The results showed that the decomposition rate of broadleaf tree species residues was significantly higher than that of coniferous species,with an order of Betula lumi-nifera＞Cinnamomum glanduliferum＞tea pruning residues＞Pinus massoniana＞Cunninghamia lanceolata.The total carbon,total nitrogen,and calorific value of plant residues showed direct release.Total phosphorus exhibited direct release in Betula luminifera but accumulation patterns in Cinnamomum glanduliferum and Pinus massoniana.Total potassium demonstrated direct release in broadleaf species and Cunninghamia lanceolata,but showed accu-mulation in the later stages of decomposition(360 days)in Pinus massoniana.The lignin content generally showed net accumulation.Furthermore,there was a significant positive correlation between the release of calorific value and the release of total carbon,total nitrogen,and total potassium during decomposition(P＜0.05).Among the five residues,Betula luminifera exhibited the highest decomposition rate,with the best performance in nutrient return and energy release.Nutrient release significantly influenced the release of calorific value,particularly carbon and nitrogen elements.The findings reveal the characteristics of material cycling and energy flow in the tea gardens,providing scientific evidence for the plant configuration and the rational utilization of plant residues in ecological tea gardens in mountainous areas of Guizhou.
赵洋洋;杨瑞;刘莎茜;高旭;宋凯
贵州大学林学院,贵阳 550025贵州大学林学院,贵阳 550025贵州大学林学院,贵阳 550025||贵州大学生命科学学院,贵阳 550025贵州大学林学院,贵阳 550025贵州大学林学院,贵阳 550025
生态茶园植物残体养分循环热值能量流动
ecological tea gardenplant residuenutrient cyclingcalorific valueenergy flux
《生态学杂志》 2026 (3)
752-759,8
贵州省林业科研项目(黔林科合[2022]22号)、贵州省科技计划项目(黔科合支撑[2020]1Y011号、黔科合基础-ZK[2023]一般231)资助.
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