Seasonal patterns and differences of soil respiration between the inside and outside of canopy gaps in the tropical montane rainforest in Hainan, south of China
Abstract
Study of soil respiration in the tropical montane forest ecosystem could provide the basic data for accurate estimating of global soil carbon emissions. In this study, the natural canopy gaps in the tropical montane rainforest observation sites of the Jianfengling National Natural Reserve on Hainan Island, south of China, were selected as the research objects. Meteorological factors (e.g. air temperature, radiation and precipitation), soil environmental parameters, soil respiration and other indicators were observed and investigated regularly. Based on those long-term observation data (from 2014 to 2018), seasonal patterns and differences of soil respiration between the inside and outside of canopy gaps (which was formatted by typhoon interference) and main influence factors were analyzed. In addition, the effects of litter on soil respiration were analyzed through removing/keeping the litter. The results showed that the annual average soil respiration ranged from 2.17 to 3.29 μmol·m-2·s-1 at the inside canopy gaps in 2014-2018, the annual average soil respiration rate at the outside canopy gaps ranged from 2.11 to 2.81μmol·m-2·s-1. The results of analysis of variance showed that there was no significant difference in soil respiration between the inside and outside canopy gaps in 2014-2017 (P>0.05). There was significant difference in soil respiration between inside and outside the forest gap in 2018 (P<0.05). The contribution rates of litter on soil respiration inside the forest gap and outside the forest gap were 31.96% and 22.38%, respectively. At the monthly and annual scales, the variation of soil respiration showed a multi-peak curve at the both inside and outside forest gaps and their variation trends were very similar. The results of redundancy analysis between the soil respiration and environmental factors showed that the soil temperature (5 cm) and soil urease were the most important influence factors (accounting for 26.2% and 3.5% of variations, respectively) for soil respiration inside the forest gap. The soil temperature (5 cm) and organic carbon were the most important factors (explaining the variations of 10.7% and 15.8%, respectively) for soil respiration outside the forest gap.
- Publication:
-
AGU Fall Meeting Abstracts
- Pub Date:
- December 2019
- Bibcode:
- 2019AGUFM.B33E..11L
- Keywords:
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- 0402 Agricultural systems;
- BIOGEOSCIENCES;
- 0414 Biogeochemical cycles;
- processes;
- and modeling;
- BIOGEOSCIENCES;
- 0428 Carbon cycling;
- BIOGEOSCIENCES;
- 0495 Water/energy interactions;
- BIOGEOSCIENCES