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[1]李勋,张丹桔,张艳,等.林窗边缘效应对马尾松和香樟凋落叶分解的影响[J].应用与环境生物学报,2017,23(03):570-578.[doi:2017.02026]
 LI Xun,ZHANG Danju,ZHANG Yan,et al.The edge effect of a forest gap on decomposition of Pinus massoniana and Cinnamomum camphora leaf litter[J].Chinese Journal of Applied & Environmental Biology,2017,23(03):570-578.[doi:2017.02026]
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林窗边缘效应对马尾松和香樟凋落叶分解的影响()
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《应用与环境生物学报》[ISSN:1006-687X/CN:51-1482/Q]

卷:
23卷
期数:
2017年03期
页码:
570-578
栏目:
研究论文
出版日期:
2017-06-25

文章信息/Info

Title:
The edge effect of a forest gap on decomposition of Pinus massoniana and Cinnamomum camphora leaf litter
作者:
李勋张丹桔张艳张健宋思梦周扬刘华
四川农业大学林学院生态林业研究所,生态林业工程重点实验室,长江上游生态安全协同创新中心 成都 611130
Author(s):
LI Xun ZHANG Danju ZHANG Yan ZHANG Jian SONG Simeng ZHOU Yang & LIU Hua
Institute of Ecology & Forestry, College of Forestry, Sichuan Agricultural University, Key Laboratory of Forestry Ecological Engineering in Sichuan, Collaborative Innovation Center of Ecological Security in the Upper Reaches of Yangtze River, Chengdu, 611130, China
关键词:
林窗边缘效应凋落叶质量损失养分释放马尾松香樟
Keywords:
forest gap edge effect leaf litter mass loss nutrient release Pinus massoniana Cinnamomum camphora
分类号:
S753 : Q148
DOI:
2017.02026
摘要:
为了解马尾松(Pinus massoniana)人工林不同面积林窗边缘凋落叶分解的养分释放规律,采用凋落袋分解实验,以长江上游低山丘陵区人为采伐形成的马尾松人工林7种不同大小林窗(G1:100 m2;G2:225 m2;G3:400 m2;G4:625 m2;G5:900 m2;G6:1 225 m2;G7:1 600 m2)为研究对象,以林下为对照,探讨马尾松和香樟(Cinnamomum camphora)凋落叶的质量损失率和养分释放率. 结果表明:除钾释放率外,林窗边缘两种凋落叶的质量损失率和养分释放率均显著高于林下. 在1.5年分解过程中,两种凋落叶的质量损失率和碳释放率呈持续上升趋势. 分解前90 d,两种凋落叶的质量损失速率和养分释放速率最快;分解90-360 d后,部分林窗出现氮和磷的富集现象;180-270 d和1.5年后,部分林窗出现钾的富集现象. 随林窗面积增大,除钾释放率外,两种凋落叶在中型林窗边缘(400、600和900 m2)具有较高的质量损失率和养分释放率. 在凋落叶分解过程中,质量损失率和碳、氮释放率与土壤含水率均呈显著正相关. 中型林窗(400-900 m2)对凋落物的分解具有更显著的边缘效应,而这种边缘效应与物种有一定关联. 因此,在马尾松低效林改造过程中,可利用中型林窗(400-900 m2)边缘这一显著作用,引入乡土阔叶树种加速马尾松人工林的物质循环,维持林分地力. (图4 表4 参61)
Abstract:
The aim of this study was to adjust the structure of a forest and explore the patterns of litter nutrient release under the influence of edge effects of a forest gap in a Pinus massoniana plantation in a low hilly land, Sichuan basin of China. The experiment was set up in a P. massoniana plantation with seven gap sizes (G1: 100 m2; G2: 225 m2; G3: 400 m2; G4: 625 m2; G5: 900 m2; G6: 1?225 m2; and G7: 1?600 m2) established by artificial thinning. The mass and nutrient loss rates for P. massoniana and Cinnamomum camphora were evaluated at the gap edges and in the closed canopy. Litterbags were collected from the gap edges and closed canopy in February, May, August, and November of 2014 and in May 2015. The results showed that the mass loss rates and nutrient release rates of two types of litter except for K at a gap edge were significantly higher than those under the closed canopy. Most of C, N, P, and K was released during the first 90 days of the decomposition experiment. After 1.5-year decomposition, two types of leaf litter showed an increase in the mass loss rate and C release rate. After 90–360 days of decomposition, the N and P?enrichment?at the edge of some gaps was detected, whereas K enrichment was found during 180–270 days and 540 days of the decomposition. Soil moisture content positively correlated with the mass loss rate and C and N release rates and was the best predictor of litter decomposition (P < 0.05). The mass and nutrient losses were higher at the edges of G3, G4, and G5 and lower at the edges of other gaps and closed canopy (P < 0.05), implying that the edge of a gap of 400 m2 to 900 m2 is a key determinant of the decomposition rates of leaf litter. Nonetheless, this effect also depends on species. When we reconstruct a low-function forest, we can take advantage of the edge effects of medium-sized gaps (400–900 m2) and introduce native broad-leaf tree species to accelerate nutrient cycling and to maintain?the?soil?fertility of P. massoniana plantations.

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更新日期/Last Update: 2017-06-25