模拟N沉降对次生林凋落物归还量的影响  

Effects of Simulated Nitrogen Deposition on Litter Return of Secondary Forest

作　　者：梁政 王加兴 Liang Zheng;Wang Jiaxing(Liangshan Prefecture Forestry Investigation Planning Design Institute,Xichang,Sichuan 615000,China)

机构地区：[1]凉山州林业调查规划设计院,四川西昌615000

出　　处：《绿色科技》2023年第15期140-144,共5页Journal of Green Science and Technology

摘　　要：为研究持续增加的N沉降对次生林不同凋落物组分归还量的影响,自2020年7月中上旬起,在凉山州美姑大风顶国家自然保护区的次生常绿阔叶竹林中随机开展了模拟N沉降试验。模拟的N沉降水平分别为对照组0N[CK,0 g/(m^(2)·a)],试验组低氮[LN,10 g/(m^(2)·a)],试验组高氮[HN,20 g/(m^(2)·a)]。2021年7月至2022年6月的每月上旬,利用各样方布置的凋落物框收集凋落物,随后将其分为润楠叶、石栗叶、桤木叶、其他树种叶和凋落枝5个部分,分别记录分析了每部分干重。结果表明:不同施N水平下,次生林凋落物的年凋落量分别为613.7±42.3、606.0±113.4、650.5±22.9 g/(m^(2)·a),凋落物量的增幅为4.01%~16.22%。次生林的凋落量表现出明显的季节动态,与自然状态下所表现的季节动态变化一致。This paper aims to understand the effects of increasing nitrogen deposition on the amount of litter returned to secondary forest.Since mid-to-early July 2020,N settlement simulation experiments have been conducted randomly in secondary evergreen broad-leaved bamboo forests in the Fengding National Wilderness Preservation System of Meigu,Liangshan prefecture.The simulated N deposition levels were 0 N[CK,0 g/(m^(2)·a)]in the control group,[LN,100 g/(m^(2)·a)]in the test group,and[HN,20 g/(m^(2)·a)]in the test group.From July 2021 to June 2022,litter was collected using litter boxes arranged in various squares,then the leaves were divided into 5 parts,including Phoebe Bournei leaves,chestnut leaves,alder leaves,leaves of other tree species and withered branches,and the dry weight of each part was recorded respectively.The results showed that the annual litter amount was 613.7±42.3,606.0±113.4,650.5±22.9 g/(m^(2)·a),and the increase of litter amount was 4.01%~16.22%.The litter amount of secondary forest showed obvious seasonal dynamics,which was consistent with the seasonal dynamics under natural conditions.

关 键 词：氮沉降 凋落物归还量 次生林 

分 类 号：S7[农业科学—林学]