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Forests 2017, 8(10), 403; doi:10.3390/f8100403

Dynamics of Coarse Woody Debris Characteristics in the Qinling Mountain Forests in China

1
College of Forestry, Northwest A&F University, Yangling 712100, China
2
School of Natural Resources, University of Missouri, Columbia, MO 65211, USA
3
Forestry College, Guangxi University, Nanning 530004, China
4
Qinling National Forest Ecosystem Research Station, Huoditang, Ningshan 711600, China
5
Gansu Forestry Technological College, Tianshui 741020, China
*
Author to whom correspondence should be addressed.
Received: 15 September 2017 / Revised: 18 October 2017 / Accepted: 20 October 2017 / Published: 23 October 2017
(This article belongs to the Special Issue Coarse Woody Debris of Forests in a Changing World)
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Abstract

Coarse woody debris (CWD) is an essential component in defining the structure and function of forest ecosystems. Long-term dynamics of CWD characteristics not only affect the release rates of chemical elements from CWD, but also the species diversity of inhabiting plants, animals, insects, and microorganisms as well as the overall health of ecosystems. However, few quantitative studies have been done on the long-term dynamics of CWD characteristics in forest ecosystems in China. In this study, we conducted nine tree censuses between 1996 and 2016 at the Huoditang Experimental Forest in the Qinling Mountains of China. We quantified forest biomass including CWD and CWD characteristics such as decay states and diameter classes during this period and correlated with stand, site, and climatic variables. The forest biomass was dominated by live tree biomass (88%); followed by CWD mass (6%–10%). Understory biomass contributed only a small portion (1%–4%) of the overall biomass. Significant differences in average annual increment of CWD mass were found among forest stands of different species (p < 0.0001). Forest biomass, stand age, forest type, aspect, slope, stand density, annual average temperature, and precipitation were all significantly correlated with CWD mass (p < 0.05), with forest type exhibiting the strongest correlation (r2 = 0.8256). Over time, the annual mass of different CWD characteristics increased linearly from 1996–2016 across all forest types. Our study revealed that forest biomass, including CWD characteristics, varied by forest type. Stand and site characteristics (forest biomass, forest type, aspect, slope and stand density) along with temperature and precipitation played a major role in the dynamics of CWD in the studied forest ecosystems. View Full-Text
Keywords: coarse woody debris; biomass; forest management; redundancy analysis; characteristics dynamics; Qinling Mountains coarse woody debris; biomass; forest management; redundancy analysis; characteristics dynamics; Qinling Mountains
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Yuan, J.; Jose, S.; Zheng, X.; Cheng, F.; Hou, L.; Li, J.; Zhang, S. Dynamics of Coarse Woody Debris Characteristics in the Qinling Mountain Forests in China. Forests 2017, 8, 403.

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