Accumulation of chemically degraded organic carbon in the soil profile of Chinese fir plantations

2020 ◽  
Vol 100 (3) ◽  
pp. 245-252
Author(s):  
Qicong Wu ◽  
Xianghe Jiang ◽  
Congzhi Zhang ◽  
Qianwen Lu ◽  
Jinbiao Li ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Soil Profile ◽  
Microbial Biomass Carbon ◽  
Plant Litter ◽  
Chinese Fir ◽  
Short Rotation ◽  
Soc Stock ◽  
Chinese Fir Plantation ◽  
Carbon Particulate ◽  
Soc Fractions

Short-rotation forestry relies on frequent harvests of fast-growing trees, which could deplete soil fertility and soil organic carbon (SOC) reserves. Our objective was to measure the accumulation of SOC fractions, namely the dissolved organic carbon, microbial biomass carbon, particulate organic carbon, permanganate-oxidizable carbon, and non-oxidizable organic carbon, in the soil profile of a Chinese fir plantation. Chronosequences of Chinese fir aged 7, 12, and 33 yr were sampled at depths of 0–20 cm, 20–40 cm, and 40–60 cm. The SOC stock (0–60 cm) was unchanged in the first 12 yr, but after 33 yr, there was a 41%–56% increase in the SOC stock, which reached 81.2 Mg ha−1 (P < 0.05). Permanganate-oxidizable carbon increased with time in the 0–20 cm layer but not in deeper soil depths, whereas non-oxidizable organic carbon accumulated preferentially in the 40–60 cm layer of the soil profile. Inputs of chemically complex plant litter in the soil profile may be important to maintain the oxidizable and non-oxidizable organic carbon in Chinese fir plantations.

Loss of soil organic carbon following natural forest conversion to Chinese fir plantation

2019 ◽  
Vol 449 ◽  
pp. 117476 ◽  
Author(s):  
Zhijie Yang ◽  
Shidong Chen ◽  
Xioafei Liu ◽  
Decheng Xiong ◽  
Chao Xu ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Soil Organic Carbon ◽  
Chinese Fir ◽  
Natural Forest ◽  
Forest Conversion ◽  
Chinese Fir Plantation

scholarly journals The Development and Utilization of Saline–Alkali Land in Western Jilin Province Promoted the Sequestration of Organic Carbon Fractions in Soil Aggregates

Agronomy ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 2563
Author(s):  
Yunke Qu ◽  
Jie Tang ◽  
Zihao Zhou ◽  
Ben Liu ◽  
Yucong Duan ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Microbial Biomass Carbon ◽  
Carbon Sink ◽  
Soil Aggregates ◽  
Soil Layer ◽  
Jilin Province ◽  
Western Jilin Province ◽  
Development And Utilization ◽  
Western Jilin ◽  
Soc Fractions

Soil samples from T (0~20 cm) and S (20~40 cm) layers of four saline–alkali rice fields (R5, R15, R20, and R35) with different reclamation years were selected to study the distribution of soil aggregates and the contents of readily oxidizable organic carbon (ROC), dissolved organic carbon (DOC), microbial biomass carbon (MBC), potentially mineralizable carbon (PMC), and soil organic carbon (SOC). The effects of large macroaggregate (>2 mm, LMA), small macroaggregate (0.25 to 2 mm, SMA), and microaggregate (<0.25 mm, MA) particle size, soil layer, and soil physicochemical properties on SOC fractions were also analyzed. The results showed that the LMA size in saline–alkali paddy fields were easily decomposed and was unstable due to the influence of the external environment. With the increase in reclamation years, the proportion of LMA in the S layer decreased gradually. The ROC, DOC, MBC and TOC contents of aggregates in the T and S layers gradually increased with the increase in reclamation years, and SOC fractions contents of aggregates in different grain sizes were SMA > LMA > MA. An effective way to increase carbon sink and improve the ecological environment in western Jilin Province is to change the soil environment by planting rice in saline–alkali land.

scholarly journals Moss-dominated biological soil crusts improve stability of soil organic carbon on the Loess Plateau, China  

2019 ◽  
Vol 65 (No. 2) ◽  
pp. 104-109 ◽  
Author(s):  
Xueqin Yang ◽  
Mingxiang Xu ◽  
Yunge Zhao ◽  
Liqian Gao ◽  
Shanshan Wang
Keyword(s):  
Organic Carbon ◽  
Soil Organic Carbon ◽  
Loess Plateau ◽  
Microbial Biomass Carbon ◽  
Biological Soil Crust ◽  
Water Soluble ◽  
The Loess Plateau ◽  
Moss Crusts ◽  
Moss Crust ◽  
Soc Fractions

The succession of biological soil crust (biocrust) may alter soil organic carbon (SOC) stability by affecting SOC fractions in arid and semi-arid regions. In the study, the SOC fractions were measured including soil easily oxidizable carbon (SEOC), soil microbial biomass carbon (SMBC), soil water soluble carbon (SWSC), and soil mineralizable carbon (SMC) at the Loess Plateau of China by using four biocrusts. The results show that SOC fractions in the biocrust layer were consistently higher than that in the subsoil layers. The average SOC content of moss crust was approximately 1.3–2.0 fold that of three other biocrusts. Moss crusts contain the lowest ratio of SEOC to SOC compared with other biocrusts. The ratio of SMC to SOC was the highest in light cyanobacteria biocrust and the lowest in moss crust, but no difference was observed in SMBC to SOC and SWSC to SOC in biocrust layers among four studied biocrusts. The results show that the moss crusts increase the accumulation of organic carbon into soil and reduce the ratio of SEOC to SOC and SMC to SOC. Together, these findings indicate that moss crusts increase the SOC stability and have important implications that SOC fractions and mineralization amount are good indicators for assessing the SOC stability.  

Effects of different wheat straw returning modes on soil organic carbon sequestration in a rice–wheat rotation

2019 ◽  
Vol 99 (1) ◽  
pp. 25-35 ◽  
Author(s):  
Naijuan Hu ◽  
Hang Shi ◽  
Baojun Wang ◽  
Zehai Gu ◽  
Liqun Zhu
Keyword(s):  
Organic Carbon ◽  
Soil Organic Carbon ◽  
Wheat Straw ◽  
Soil Microbial Biomass ◽  
Microbial Biomass Carbon ◽  
Soil Microbial ◽  
Rotation System ◽  
Soil Organic Carbon Sequestration ◽  
Rice Season ◽  
Soc Stock

Straw ditch-buried returning is a new straw returning mode; however, the different effect of straw ditch-buried returning and frequently used straw returning modes on soil organic carbon (SOC) sequestration is still unclear. A 2 yr field experiment was conducted and four treatments (CK: no straw returning; WR: wheat straw returning with rotary tillage; WP: wheat straw returning with plowing; WD: wheat straw ditch-buried returning) were set to assess the effects on SOC fractions and sequestration in rice–wheat rotation. Results indicated that WD had significantly higher total organic carbon than did WP and CK in wheat season. Soil dissolved organic carbon and easily oxidizable carbon contents were significantly increased by 21.3%, 24.3%, 38.6%, and 43.5% under WR than that under CK in rice and wheat seasons, respectively. Soil microbial biomass carbon (MBC) content was highest under WP in rice season, but in wheat season, WR had significantly higher MBC than WP and WD. Soil carbon pool management index was significantly higher in WR than CK, with the increase of 41.0% and 108.6%. After 2 yr rotation, WD had a significant higher SOC stock and sequestration than WP. Therefore, WD could be an available mode to increase SOC sequestration in rice–wheat rotation system.

scholarly journals Comparative assessment of profile storage of soil organic carbon and total nitrogen in forest and grassland in Jajarkot, Nepal

2020 ◽  
Vol 3 (2) ◽  
pp. 184-192
Author(s):  
Mamata Sharma ◽  
Gandhiv Kafle
Keyword(s):  
Organic Carbon ◽  
Soil Organic Carbon ◽  
Soil Sample ◽  
Total Nitrogen ◽  
Soil Profile ◽  
Soil Depth ◽  
C:N Ratio ◽  
Soil Layer ◽  
Soc Stock ◽  
Level Of Significance

Understanding distribution of soil organic carbon and nitrogen in soil profile is important for assessing soil fertility and soil carbon dynamics. However, little is known about their distribution in soil depth below 30cm in Nepal. In this context, this research was carried out in 2019 to determine the Soil Organic Carbon (SOC) and Total Nitrogen (TN) in 0-10 cm, 11-30 cm and 31-60 cm depths of soil profile at forest and grassland in Kotila community forest, Jajarkot, Nepal. Overall field measurement was based on national standard protocols. Three replicates of soil pit from forest and grassland were dug for soil sample collection. Approximately 100 g soil sample from each soil layer was collected and taken to laboratory for SOC analysis. Separate soil samples, one sample from each soil layer were collected with the help of a metal soil corer having volume 245.22cm3 to quantify bulk density. Forest has 25.42 ton/ha SOC stock and 3.28 ton/ha TN stock up to 60 cm soil depth. Likewise, Grassland has 21.19 ton/ha SOC stock and 3.14 ton/ha TN stock up to 60cm soil depth. However, these values are not significantly different at 5 % level of significance. The SOC and TN were decreased with increased soil depths, though not significantly different at 5 % level of significance. The C:N ratio was found higher in forest than grassland. It is concluded that SOC and TN do not vary significantly between forest and grassland. Topsoil contains more SOC, TN, and C:N ratio, so the management practices should focus on maintaining inputs of soil organic matter in the forest and grassland.

scholarly journals Labile carbon pools and biological activity in volcanic soils of the Canary Islands .

2014 ◽  
Vol 2 ◽  
Author(s):  
Cecilia María Armas Herrera ◽  
Carmen Dolores Arbelo Rodríguez ◽  
Juan Luis Mora Hernández ◽  
Antonio Rodríguez Rodríguez
Keyword(s):  
Organic Carbon ◽  
Canary Islands ◽  
Hydrolytic Enzymes ◽  
Plant Litter ◽  
Water Soluble ◽  
Hot Water ◽  
Volcanic Soils ◽  
Natural Habitats ◽  
Physico Chemical ◽  
Soc Fractions

It is important to assess the mineralisation of soil organic carbon (SOC) to predict the short-term response of biosphere carbon reservoirs to changing environmental conditions. We investigated the labile (easily-mineralisable) SOC in volcanic soils, where the bioavailability of SOC is typically affected by physico-chemical stabilisation mechanisms that are characteristic of these soils. Ten soils were selected that represent the most typical soil types (mainly Andosols) and natural habitats (xerophytic scrubland, laurel forest and pine forest) in the Canary Islands, a volcanic archipelago. Over two years we measured several physico-chemical SOC fractions with different degrees of bioavailability: water-soluble carbon in fresh soil samples (WSC) and in the saturated extract (WSC<sub>se</sub>), hot water-extractable carbon (HWC), potassium sulphate-extractable carbon (PSC), microbial biomass carbon (MBC), particulate organic carbon (POC), humic substances carbon (HSC), and total organic carbon (TOC), and performed CO<sub>2</sub> emission incubation assays. We related these measurements to the potential C inputs of plant litter and roots and to the activity of certain hydrolytic enzymes (CM-cellulase, β-D-glucosidase, and dehydrogenase) that are involved in carbon turnover. In vitro carbon mineralisation measurements from short assays (ten days) were fitted with simple first-order kinetics to investigate SOC. This procedure was simple and allowed us to obtain estimates both for potentially mineralisable SOC and for the heterogeneity of the substrates that were consumed during incubation. The investigated volcanic soils had large labile SOC concentrations in which simple carbohydrates predominated and that were mainly derived from roots and aboveground non-woody residues. Among the analysed physico-chemical SOC fractions, HWC (3.1 g kg<sup>-1</sup> on average at 0-30 cm depth in Andosols) was the most correlated with C<sub>0</sub> (1.2 g kg<sup>-1</sup>) and therefore best represents potentially mineralisable SOC. PSC (0.77 g kg<sup>-1</sup>), which represents an SOC pool of low bioavailability, was protected by its adsorption to allophane in silandic Andosols.

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