Changes in soil carbon fractions and enzyme activities under different vegetation types of the northern Loess Plateau

Wang, Haiyan; Wu, Jiangqi; Li, Guang; Yan, Lijuan

doi:10.1002/ece3.6852

Cited by 68 publications

(55 citation statements)

References 93 publications

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“…1 ). The site is a typical hilly plateau, with a Loessal soil type which has a deep soil layer and gullies with an average elevation of 2000 m 14 . It is a temperate semi-arid zone with an annual average temperature of 6.4 °C 15 .…”

Section: Methodsmentioning

confidence: 99%

Effects of conservation tillage strategies on soil physicochemical indicators and N2O emission under spring wheat monocropping system conditions

Yuan

Yan

et al. 2022

Sci Rep

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As one of the important greenhouse gas, nitrous oxide (N2O) has attracted much attention globally under climate change context. Agricultural practices are the main sources of greenhouse gas emissions. Nevertheless, scarcity of literature is available on the effects of different tillage measures on soil N2O emission under spring wheat (Triticum aestivum L.) ecosystem in the semi-arid area of the Loess Plateau. The main objective of the experimental study was to explore the influence of conservation tillage techniques on soil physicochemical properties, nitrous oxide emission and yield in the Northern semi-arid Dingxi region of China. Four treatments viz., conventional tillage (CT), no tillage (NT), straw mulch with conventional tillage (TS) and stubble-return with no-till (NTS) were evaluated under randomized complete block design with three replications. Our results depicted that compared with conventional tillage, bulk density and water content of topsoil was increased and soil pH value was reduced under conservation tillage techniques. Conservation tillage NT, TS and NTS increased organic carbon, TN, MBN and NH4+-N and reduced the accumulation of NO3–N. Additionally, although the N2O emission under NT, TS and NTS was 8.95, 41.90 and 21.05% respectively higher than under T treatment, the corresponding wheat yield was 15.40, 31.97 and 63.21% higher than T treatment. Moreover, correlation analysis showed that soil moisture and temperature were the most significant factors affecting soil N2O emission. The NTS treatment pointedly increased crop yield without significantly increasing soil N2O emission. Consequently, based on economic and environmental benefits and considering N2O emission and crop yield, we suggest that NTS technique is the best conservation tillage strategy in the semi-arid environmental zone of the Loess Plateau of Dingxi China.

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Section: Methodsmentioning

confidence: 99%

Effects of conservation tillage strategies on soil physicochemical indicators and N2O emission under spring wheat monocropping system conditions

Yuan

Yan

et al. 2022

Sci Rep

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“…We determined the SOC content according to the method by Wang et al 46 . Briefly, the soil sample (0.1 g, accurate to 0.001 g) was extracted with 7.5 ml of 0.4 M of K 2 Cr 2 O 7 and 7.5 ml of concentrated H 2 SO 4 at 180 °C for 30 min, and then calculate the SOC content based on the consumption of potassium dichromate 35 .…”

Section: Methodsmentioning

confidence: 99%

Vertical and seasonal changes in soil carbon pools to vegetation degradation in a wet meadow on the Qinghai-Tibet Plateau

Wang

et al. 2021

Sci Rep

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Wet meadows provide opportunities to decrease carbon dioxide (CO2) and methane (CH4) released into the atmosphere by increasing the soil organic carbon (SOC) stored in wetland systems. Although wet meadows serve as the most important and stable C sinks, there has been very few investigations on the seasonal distributions of SOC fractions in high-altitude wet meadows. Here, we studied the effects of four vegetation degradation levels, non-degraded (ND), lightly degraded (LD), moderately degraded (MD), and heavily degraded (HD), on the measured vertical and seasonal changes of SOC and its different fractions. Among these vegetation degradation levels, 0–10 and 10–20 cm soil depths in ND plots had significantly higher SOC contents than the other degradation levels had throughout the year. This is attributed to the relatively greater inputs of aboveground plant litter and richer fine-root biomass in ND plots. Particulate organic carbon (POC) and light fraction organic carbon (LFOC) showed similar vertical and seasonal variations in autumn, reaching a minimum. Moreover, microbial biomass (MBC) and easily oxidizable organic carbon (EOC) contents were highest in summer and the smallest in winter, while dissolved organic carbon (DOC) content was highest in spring and lowest in summer, and were mainly concentrated in the 0–20 cm layer. Pearson correlation analysis indicated that soil properties and aboveground biomass were significantly related to different SOC fractions. The results indicate that vegetation degradation reduces the accumulation of total SOC and its different fractions, which may reduce carbon sink capacity and soil quality of alpine wet meadows, and increase atmospheric environmental pressure. In addition, vegetation biomass and soil characteristics play a key role in the formation and transformation of soil carbon. These results strengthen our understanding of soil C dynamics, specifically related to the different C fractions as affected by vegetation degradation levels and soil depth, in wet meadow systems.

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“…Alkaline phosphatase is the main enzyme that is involved in the process of hydrolyzing organophosphorus ester into inorganic phosphate (Niu et al, 2017). Sucrase participates in the conversion of soil carbohydrates (Wang et al, 2020). The higher values of CV of urease, alkaline phosphatase, and sucrase among nine sites may indicate the heterogeneous development of cyanobacteria‐dominated crusts.…”

Section: Discussionmentioning

confidence: 99%

Depth‐related response of soil enzymes to cyanobacteria‐dominated crusts along a precipitation gradient

Zhang

Wang

et al. 2021

Land Degrad Dev

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This study aimed to elucidate the ecological role of cyanobacteria-dominated crusts on soil enzymes activities along a precipitation gradient. Results showed that proteins and polysaccharides contents of cyanobacterial-dominated crusts changed significantly among nine sample sites. Meanwhile, proteins and polysaccharides displayed a downward trend with increasing thickness and decreased with increasing mean annual temperature, while these two first increased, and then decreased with increasing chlorophyll a. The pronounced variations of polysaccharides and proteins could be explained by the shift in cyanobacteria species composition due to the discrepancy of succession stage at the regional scale. Activities of soil enzymes decreased with depth and varied significantly among sample sites. Redundancy analysis showed that soil enzymes activities in 0-2 cm were mainly explained by microbial biomass, polysaccharides, and soil organic carbon, and those in 2-5 cm were mainly influenced by microbial biomass and climate, while those in 5-10 cm were mainly affected by climate. The results highlighted the intrinsic involvement of microbes in shallower soil (0-5 cm) after the establishment of crusts and proved the effect of polysaccharides on surface soil (0-2 cm) enzymes activities. The strengthened effect of climate on soil enzymes activities in depths manifested the water availability and temperature would restrict soil microbial activity. Therefore, we concluded that the response of soil enzymes activities beneath the cyanobacteria-dominated crusts is depth related. Overall, our findings will provide a better knowledge of cyanobacteria-dominated crusts properties at the regional scale, and its effects on soil enzymes activities can replenish the understanding of cyanobacteria-dominated crusts on biogeochemical processes. K E Y W O R D Sarid and semiarid ecosystem, cyanobacteria-dominated crusts, microbial biomass, polysaccharides, soil enzymes activities | INTRODUCTIONSoil enzymes are derived from living and dead microbes, soil organisms, plant roots and residues, and pivotal in mediating and catalyzing soil functions, for example, organic matter decomposition and nutrient cycling, which closely link with life processes of microorganisms in soils (Dick, 1994). Due to the widely acknowledged sensitivities to naturally or anthropogenically induced soil disturbances and the advantages of easy to be measured, soil enzymes activities have been often considered as a reliable measurement of soil performance to different vegetation, soil physicochemical properties, microbial community, and succession

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Changes in soil carbon fractions and enzyme activities under different vegetation types of the northern Loess Plateau

Cited by 68 publications

References 93 publications

Effects of conservation tillage strategies on soil physicochemical indicators and N2O emission under spring wheat monocropping system conditions

Effects of conservation tillage strategies on soil physicochemical indicators and N2O emission under spring wheat monocropping system conditions

Vertical and seasonal changes in soil carbon pools to vegetation degradation in a wet meadow on the Qinghai-Tibet Plateau

Depth‐related response of soil enzymes to cyanobacteria‐dominated crusts along a precipitation gradient

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