|Table of Contents|

Mass loss of Pinus massoniana and Cinnamomum camphora leaf litter in forestgaps of different size*(PDF)

Chinese Journal of Applied & Environmental Biology[ISSN:1006-687X/CN:51-1482/Q]

Issue:
2016 02
Page:
292-299
Research Field:
Articles
Publishing date:

Info

Title:
Mass loss of Pinus massoniana and Cinnamomum camphora leaf litter in forestgaps of different size*
Author(s):
LI Xun1 CUI Ningjie1 ZHANG Jian1 2 3** LIU Yang1 ZHANG Yan1 DENG Changchun1 ZHANG Mingjin1& LIU Hua1
1Institute of Ecology & Forestry, College of Forestry, Sichuan Agriculture University, Chengdu 611130, China2Key Laboratory of Forestry Ecological Engineering in Sichuan, Chengdu 611130, China3Collaborative Innovation center of Ecological Security in th
Keywords:
mass loss litter decomposition forest gap Pinus massoniana Cinnamomum camphora Pinus massoniana
CLC:
Q148
PACS:
DOI:
10.3724/SP.J.1145.2015.07026
DocumentCode:

Abstract:
Forest gap plays an important role in optimizing and adjusting the structure of plantation. However, researchersare not clear whether the gap size affects mass loss, or which gap size contributes more to litter decomposition. This researchset up a field litterbag experiment to study the effects of different forest gap size on mass loss of Pinus massoniana (Pm) andCinnamomum camphora (Cc) leaf litter. The Pm plantation was thinned to establish seven different gap sizes (G1: 100 m2, G2:225 m2, G3: 400 m2, G4: 625 m2, G5: 900 m2, G6: 1 225 m2, G7: 1 600 m2); closed canopy was used as the control. The resultsshowed 1) the forest gap size had significant effect on mass loss of Pm and Cc, with the k value of Olson decomposition modelas G4 > G1 > CK > G2 > G3 > G5 > G6 > G7 in Pm, and G2 > G4 > G1 > CK > G5 > G6 > G7 > G3 in Cc. Compared withsmall and large forest gaps, those of medium sized (G4) promoted the mass loss rate of Cc and Pm. 2) In both Pm and Cc, themass loss rate (per 30 days) first increased and then decreased in the 90-day period. After one year decomposition, the massloss rate in 3 mesh sizes was 0.04 mm (35%) < 0.5 mm (43%) < 3 mm (51%) in Pm, and 0.04 mm (42%) < 0.5 mm (49%) < 3 mm(60%) in Cc. The 95% decomposition time was 3.6 years for Cc and 4.35 years for Pm, showing a higher mass loss rates (per 30days) in Pm than in Cc. The results indicated that forest gap size has significant effect on mass loss rate of Pm and Cc leaf litter.In reconstructing low-function forest, we can take advantage of medium-sized gaps and introduce native broad-leaf tree speciesCc to accelerate nutrient cycling and maintain the soil fertility of Pm plantations.

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