马尾松人工林窗对红椿凋落叶分解过程中微生物生物量的影响

生态学杂志

马尾松人工林窗对红椿凋落叶分解过程中微生物生物量的影响

张明锦^1,2,3,陈良华^1,2,3,张丹桔^1,2,3,张艳^1,2,3,刘华^1,2,3,李勋^1,2,3,杨万勤^1,2,3,张健^1,2,3**

(¹长江上游林业生态工程重点实验室，四川农业大学生态林业研究所，成都 611130； ^2高山森林生态系统定位研究站, 华西雨屏区生态环境监测站，成都 611130； ³长江上游生态安全协同创新中心，成都 611130）

出版日期:2015-10-10 发布日期:2015-10-10

Effects of forest gap on microbial biomass during litter decomposition of Toona ciliata in Pinus massoniana plantations.

ZHANG Ming-jin^1,2,3,CHEN Liang-hua^1,2,3, ZHANG Dan-ju^1,2,3, ZHANG Yan^1,2,3, LIU Hua^1,2,3, LI Xun^1,2,3, YANG Wan-qin^1,2,3, ZHANG Jian^1,2,3**

(¹Key laboratory of Ecological Forestry Engineering of Sichuan Province, Institute of Ecology & Forest, Sichuan Agricultural University, Chengdu 611130, China;
²Longterm Research Station of Alpine Forest Ecosystems and Monitoring Station for Ecoenvironments in the Rainy Zone of Southwest China, Chengdu 611130, China; ³Collaborative Innovation Center of Ecological Security in the Upper Reaches of Yangtze River, Chengdu 611130, China)

Online:2015-10-10 Published:2015-10-10

摘要/Abstract

摘要： 为了认识林窗大小对凋落叶分解过程中微生物生物量的影响，以42年生的马尾松人工林7种不同大小林窗（G1：100 m²、G2：225 m²、G3：400 m²、G4：625 m²、G5：900 m²、G6：1225 m²、G7：1600 m²）为研究对象，分析红椿凋落叶分解过程中微生物生物量碳（MBC）、氮（MBN）及其比值（MBC/MBN）随林窗面积和分解时间（30、90和180 d)的动态变化，并对比这些指标在林窗中心和边缘的差异。结果显示：（1）林窗大小极显著影响了红椿凋落叶分解过程中的MBN，对MBC和MBC/MBN也有显著影响。总体上，中小型林窗（G1～G5)的微生物生物量较高。（2）各林窗中央与边缘间MBC、MBN、MBC/MBN虽有所差异，但并不显著。（3）分解时间对凋落叶中的MBC、MBN、MBC/MBN都有着极显著影响，在分解90 d时，MBC和MBC/MBN最高，MBN最低。（4）MBC与温度、含水量极显著相关，MBN、MBC/MBN与温度的相关性也极显著。研究表明，林窗形成后温度和水分的改变显著影响了红椿凋落叶分解过程中的微生物生物量；其中，中小型（G1～G5)林窗能显著增加微生物生物量；MBC与MBN随分解时间的变化表现出相反的变化趋势。

关键词: 生态系统功能, 土壤微食物网, 能量通道, 植物-土壤反馈

Abstract: To understand the effects of forest gap on microbial biomass in the process of leaf litter decomposition, seven gap sizes (G1: 100 m², G2: 225 m², G3: 400 m², G4: 625 m², G5: 900 m², G6: 1225 m², G7: 1600 m²) were created in a 42-year-old Pinus massoniana plantation, and uncut pure stand was used as a control. We investigated the dynamics of microbial biomass C (MBC), N (MBN) and MBC/MBN in the process of leaf litter decomposition of Toona ciliata after 30, 90, and 180 days of incubation, and compared the differences of such parameters between the center and edge of the gaps. Our results showed that: (1) the gap size significantly affected MBN, MBC and MBC/MBN. Overall, the microbial biomass in small and moderate forest gaps (G1-G5) was higher than that in large forest gaps. (2) There was no significant difference in MBC, MBN and MBC/MBN between the center and the edge of each size of gap. (3) Decomposition time exhibited very sig〖HJ*3〗nificant effects on MBC, MBN and MBC/MBN. After 90 days of incubation, MBC and MBC/MBN were the highest, whereas MBN was the lowest. (4) MBC showed a very close correlation with both temperature and water content, while MBN and MBC/MBN were related to temperature significantly. Taken together, our results indicated that the alteration of soil temperature and moisture due to the formation of forest gaps significantly affected the microbial biomass in the process of T. ciliata litter decomposition, the small and moderate gaps (G1-G5) could significantly increase microbial biomass, and the variation of MBC showed an opposite trend to MBN along with decomposition time.

Key words: soil micro-food web, plant-soil feedback., energy channel, ecosystem function

张明锦1,2,3,陈良华1,2,3,张丹桔1,2,3,张艳1,2,3,刘华1,2,3,李勋1,2,3,杨万勤1,2,3,张健1,2,3**. 马尾松人工林窗对红椿凋落叶分解过程中微生物生物量的影响[J]. 生态学杂志.

ZHANG Ming-jin1,2,3,CHEN Liang-hua1,2,3, ZHANG Dan-ju1,2,3, ZHANG Yan1,2,3, LIU Hua1,2,3, LI Xun1,2,3, YANG Wan-qin1,2,3, ZHANG Jian1,2,3**. Effects of forest gap on microbial biomass during litter decomposition of Toona ciliata in Pinus massoniana plantations.[J]. cje.

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