Litter Production and Soil Organic Carbon Dynamincs of Pinus densiflora, Quercus mongolica and Robinia pseudo-acacia Forests in Mt. Nam

Abstract Background Standing biomass, litter production, rate of litter decomposition, amount of litter on forest floor, and amount of soil organic carbon distribution were investigated from March 2016 to November 2018 in order to evaluate the ecosystem value through organic carbon distribution in the Pinus densiflora forest at Namsan, Seoul Metropolitan City. Results The amount of organic carbon in the Pinus densiflora forest was 261.09 ton C ha−1 during the research period, and fixed organic carbon in plant through net photosynthesis was 3.2 ton C ha−1 year−1. The organic carbon in plant was 62.77 ton C ha−1 (24.04%), in litter on the forest floor was 3.65 ton C ha−1 (1.40%), and in soil was 194.67 ton C ha−1 (74.56%). The value of plant, litter on forest floor, and soil organic carbon distribution were each 6,277,000 won ha−1, 365,000 won ha−1, and 19,467,000 won ha−1. The value per ton of fixed organic carbon in plant through net photosynthesis was 320,000 won ha−1 year−1 and the value of ecosystem services stored in carbon in the Namsan forest ecosystem was about 26.1 million won ha−1 for 3 years. Conclusions The results of this study suggest that the pine forests of Namsan rapidly decompose leaves due to the high atmospheric temperature and accumulate a large amount of organic carbon in the soil to provide climate control regulatory service function.

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Importance of mosses and vascular plants in peat soil carbon sequestration

10.5194/egusphere-egu21-9170 ◽

2021 ◽

Author(s):

Åsa Kasimir ◽

Per-Erik Jansson

Keyword(s):

Organic Carbon ◽

Soil Organic Carbon ◽

Vascular Plants ◽

Research Council ◽

Vascular Plant ◽

Plant Litter ◽

Carbon Accumulation ◽

Litter Production ◽

Water Depletion ◽

Dry Spells

<p>Nutrient rich peat soils have earlier been shown to loose carbon despite higher photosynthesis and litter production compared to nutrient poor soils, where instead carbon accumulated. To understand this phenomena data from two drained Finnish sites, nutrient poor Kalevansuo and nutrient rich Lettosuo, was combined with a process-oriented model (CoupModel). Uncertainty based calibrations were made using eddy-covariance data (hourly values of net ecosystem exchange) and tree growth data. The model design was three vegetation layers: trees, smaller vascular plants and a bottom layer with mosses, all with different LAI and degree of coverage. Adding a moss layer was a new approach, having a modified physiology compared to vascular plants. Soil organic carbon was described by two separate litter pools for vascular plants and mosses together with a common inert pool of decomposed organic matter. Over a period of 10 years the model showed similar photosynthesis rate for the two sites but higher biomass accumulation for the fertile stand. Moss biomass did not increase, instead mosses delivered high litter inputs with low turnover rates compared with litter from vascular plants. Both the soil organic carbon received from vascular plant litter and the old decomposed matter declined by time, while litter originating from mosses was accumulating by time. Large differences between the sites were obtained during dry spells where soil heterotrophic decomposition was enhanced in the vascular plants dominated site, due to a larger water depletion by roots. Important for carbon accumulation in the poor soil was the mosses, adding larger litter quantities with a resistant quality together with less water depletion in dry spells.</p><p>This project was funded by the Swedish Research Council FORMAS, the Research Council of Norway (MYR-project), and the Swedish strategic research area BECC.</p>

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Carbon Storage of Single Tree and Mixed Tree Dominant Species Stands in a Reserve Forest—Case Study of the Eastern Sub-Himalayan Region of India

Land ◽

10.3390/land10040435 ◽

2021 ◽

Vol 10 (4) ◽

pp. 435

Author(s):

Prakash Rai ◽

Vineeta ◽

Gopal Shukla ◽

Abha Manohar K ◽

Jahangeer A Bhat ◽

...

Keyword(s):

Organic Carbon ◽

Soil Organic Carbon ◽

Tectona Grandis ◽

Himalayan Region ◽

Litter Production ◽

Shorea Robusta ◽

Fertility Status ◽

Soil Fertility Status ◽

Michelia Champaca ◽

Eastern Himalayan Region

In recent decades, carbon (C) management is an important point on the agenda to identify the best viable mitigation strategies for its reduction. The study was conducted at Jaldapara National Park located in the Eastern Himalayan region of India. The study quantified litter production, decomposition, periodic nutrient release, soil fertility status, and soil organic carbon (SOC) of five major forest stands i.e., Tectona grandis (TGDS), Shorea robusta (SRDS), Michelia champaca (MCDS), Lagerstroemia parviflora (LPDS) and miscellaneous stand (MS). A stratified random nested quadrate method was adopted for sample collection. Results reveal that the greatest amount of litter production and decomposition was under MCDS followed by MS, LPDS, SRDS, and the smallest under TGDS. The material annual turnover through litter decomposition in all the stands varies between 96.46% and 99.34%. The content and amount of the available nutrients in litter varied significantly among the stands. Moreover, release of these nutrients was nearly equal to the amount available in the initial litter mass. In general, the magnitude of the total nutrient return was in the same order as the total litter fall and the nutrient availability was more closely related to litter nutrient content and soil organic carbon. The range of pH (4.86–5.16), EC (0.34–0.50), soil moisture (27.01–31.03) and available primary nutrients (N: (0.21–0.26 Mg/ha), P: (0.09–0.12 Mg/ha), K: (0.13–0.14 Mg/ha)) also varied significantly among the stands. Significant positive correlations were observed between SOC, N and K. Both the fertility indices exhibited no definite pattern in the stands but a significant correlation between the two indicates the healthy soil fertility status of the stands. SOC varies significantly under different forest stands, but the greatest content was found under MS. The estimated SOC ranges between 75.9 and 107.7 Mg ha−1 up to 60 cm and is reported to be below the Indian average of 182.94 Mg ha−1. The present study strongly recommends that Tectona grandis, Shorea robusta, Michelia champaca, and Lagerstroemia parviflora should be the important commercial timbers of the Eastern Himalayan region because they may help further to increase the C sink in agricultural and degraded landscapes.

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