文献类型：期刊文献

中文题名：氮磷添加下马尾松人工林不同凋落物组分分解的土壤调控

英文题名：Soil regulatory effects on the decomposition of different litter components in Pinus massoniana plantation under nitrogen and phosphorus additions

作者：李璟[1,2] 周永维[1,2] 沈雅飞[1,2] 曾立雄[1,2] 刘常富[1,2] 程瑞梅[1,2] 肖文发[1,2]

第一作者：李璟

机构：[1]中国林业科学研究院森林生态环境与自然保护研究所,国家林业和草原局森林生态环境重点实验室,北京100091;[2]湖北秭归三峡库区森林生态系统定位观测研究站,湖北秭归443600

年份：2026

卷号：37

期号：2

起止页码：441-452

中文期刊名：应用生态学报

外文期刊名：Chinese Journal of Applied Ecology

收录：;北大核心:【北大核心2023】；

基金：中央级公益性科研院所基本科研业务费专项资金项目(CAFYBB2023QB005);中央级公益性科研院所基本科研业务费专项资金项目(CAFYBB2022XD002)资助;国家重点研发计划项目(2023YFD2200402)。

语种：中文

中文关键词：马尾松;氮磷添加;凋落物分解;土壤酶活性;土壤化学性质

外文关键词：Pinus massoniana;nitrogen and phosphorus addition;litter decomposition;soil enzyme activity;soil chemical property

分类号：S714

摘要：本研究基于为期2年的氮、磷添加试验,设置对照(0 kg N·hm^(-2)·a^(-1),0 kg P·hm^(-2)·a^(-1))、磷(30 kg P·hm^(-2)·a^(-1))、低氮(30 kg N·hm^(-2)·a^(-1))、低氮+磷(30 kg N·hm^(-2)·a^(-1),30 kg P·hm^(-2)·a^(-1))、高氮(90 kg N·hm^(-2)·a^(-1))、高氮+磷(90 kg N·hm^(-2)·a^(-1),30 kg P·hm^(-2)·a^(-1))6个处理,研究了马尾松人工林地上不同组分凋落物(叶、枝、果)和细根凋落物(Ⅰ~Ⅲ级根)的分解过程,分析了其与土壤pH、有机碳、全氮等化学因子及α-1,4-葡糖苷酶等水解酶活性的关系,并采用方差分解法量化了土壤因子对凋落物可溶性糖、淀粉等养分残留率及分解系数的相对贡献。结果表明:同一处理下,不同组分凋落物的分解系数(k)存在显著差异,枝条(k=0.42~0.49)整体上低于叶和果,Ⅰ级细根(k=0.42~0.51)整体上显著低于Ⅱ级和Ⅲ级。与单一养分添加相比,低氮+磷处理显著促进了凋落物的分解和养分释放;高氮处理使土壤pH降低23.1%,从而显著抑制分解,而高氮+磷处理则将高氮处理下pH提升13.9%,有效缓解了高氮的不利效应。土壤酶活性与化学因子共同驱动了凋落物分解过程,其中酶活性因子的独立解释率(5.1%~15.2%)整体上高于化学因子(0.7%~6.5%)。土壤酶活性是外源养分输入影响凋落物分解的关键驱动因子。在马尾松人工林经营管理中,应避免单一或过量施氮,并依据土壤状况合理配施磷肥,以通过增强土壤生物活性促进凋落物的分解和养分归还。
In this study,we conducted a two-year nitrogen and phosphorus addition experiment with six treatments:control(0 kg N·hm^(-2)·a^(-1),0 kg P·hm^(-2)·a^(-1)),phosphorus(30 kg P·hm^(-2)·a^(-1)),low nitrogen(30 kg N·hm^(-2)·a^(-1)),low nitrogen+phosphorus(30 kg N·hm^(-2)·a^(-1),30 kg P·hm^(-2)·a^(-1)),high nitrogen(90 kg N·hm^(-2)·a^(-1)),and high nitrogen+phosphorus(90 kg N·hm^(-2)·a^(-1),30 kg P·hm^(-2)·a^(-1)).We investigated the decomposition of different litter components of aboveground(leaf,branch,fruit)and fine root litter(classⅠ-Ⅲroots)in Pinus massoniana plantation,examined their relationships with soil chemical factors(e.g.,pH,organic carbon,total nitrogen)and hydrolytic enzyme activities(e.g.,α-1,4-glucosidase).We further quantified the relative contributions of soil factors to nutrient residue(e.g.,soluble sugars,starch)and decomposition coefficients(k)following variation partitioning analysis.The results showed that decomposition coefficients varied significantly among litter components in the same treatment,with branches(k=0.42-0.49)being lower than leaves and fruits,and first-order roots(k=0.42-0.51)being lower than higher-order roots.Compared with single-nutrient addition,the low nitrogen+phosphorus treatment significantly enhanced litter decomposition and nutrient release.In contrast,high nitrogen treatment reduced soil pH by 23.1%and markedly inhibited decomposition.The high nitrogen+phosphorus treatment raised pH by 13.9%,effectively mitigating the adverse effect of high nitrogen.Soil enzyme activity and chemical factors jointly drove litter decomposition,with the independent contribution of enzyme activity(5.1%-15.2%)being overall higher than that of chemical factors(0.7%-6.5%).Soil enzyme activity was the key driving factor for the decomposition of litter influenced by exogenous nutrient input.In the management of P.massoniana plantations,it was necessary to avoid excessive or single application of nitrogen,and should appropriately apply phosphorus fertilizer based on the soil conditions.This was to enhance soil biological activities and promote litter decomposition and nutrient return.