Response of soil labile organic carbon fractions and carbon-cycle enzyme activities to vegetation degradation in a wet meadow on the Qinghai–Tibet Plateau

Geoderma ◽  
2020 ◽  
Vol 377 ◽  
pp. 114565
Author(s):  
Weiwei Ma ◽  
Guang Li ◽  
Jianghua Wu ◽  
Guorong Xu ◽  
Jiangqi Wu
Keyword(s):  
Organic Carbon ◽  
Carbon Cycle ◽  
Enzyme Activities ◽  
Tibet Plateau ◽  
Wet Meadow ◽  
Labile Organic Carbon ◽  
Cycle Enzyme ◽  
Soil Labile Organic Carbon ◽  
Organic Carbon Fractions ◽  
Qinghai Tibet Plateau

scholarly journals Vegetation degradation impacts soil nutrients and enzyme activities in wet meadow on the Qinghai-Tibet Plateau

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Jiangqi Wu ◽  
Haiyan Wang ◽  
Guang Li ◽  
Weiwei Ma ◽  
Jianghua Wu ◽  
...  
Keyword(s):  
Enzyme Activity ◽  
Soil Nutrients ◽  
Enzyme Activities ◽  
Soil Depth ◽  
Soil Nutrient ◽  
Tibet Plateau ◽  
Wet Meadow ◽  
Vegetation Degradation ◽  
Thaw Cycle ◽  
Qinghai Tibet Plateau

AbstractVegetation degradation, due to climate change and human activities, changes the biomass, vegetation species composition, and soil nutrient input sources and thus affects soil nutrient cycling and enzyme activities. However, few studies have focused on the responses of soil nutrients and enzymes to vegetation degradation in high-altitude wet meadows. In this study, we examined the effects of vegetation degradation on soil nutrients (soil organic carbon, SOC; total nitrogen, TN; total phosphorus, TP) and enzyme activities (i.e., urease, catalase, amylase) in an alpine meadow in the eastern margin of the Qinghai-Tibet Plateau. Four different levels of degradation were defined in terms of vegetation density and composition: primary wet meadow (CK), lightly degraded (LD), moderately degraded (MD), and heavily degraded (HD). Soil samples were collected at depth intervals of 0–10, 10–20, 20–40, 40–60, 60–80, and 80–100 cm to determine soil nutrient levels and enzyme activities. The results showed that SOC, TN, catalase and amylase significantly decreased with degradation level, while TP and urease increased with degradation level (P < 0.05). Soil nutrient and enzyme activity significantly decreased with soil depth (P < 0.05), and the soil nutrient and enzyme activity exhibited obvious "surface aggregation". The activities of soil urease and catalase were strongest in spring and weakest in winter. The content of TN in spring, summer, and autumn was significantly higher than observed in winter (P < 0.05). The soil TP content increased in winter. Soil amylase activity was significantly higher in summerm than in spring, autumn, and winter (P < 0.05). TP was the main limiting factor for plant growth in the Gahai wet meadow. Values of SOC and TN were positively and significantly correlated with amylase and catalase (P < 0.05), but negatively correlated with urease (P < 0.05). These results suggest the significant role that vegetation degradation and seasonal freeze–thaw cycle play in regulating enzyme activities and nutrient availability in wet meadow soil.

Effects of different rice-crab production modes on soil labile organic carbon and enzyme activities

2012 ◽  
Vol 32 (15) ◽  
pp. 4753-4761 ◽  
Author(s):  
安辉 AN Hui ◽  
刘鸣达 LIU Mingda ◽  
王耀晶 WANG Yaojing ◽  
闫颖 YAN Ying
Keyword(s):  
Organic Carbon ◽  
Enzyme Activities ◽  
Labile Organic Carbon ◽  
Soil Labile Organic Carbon

scholarly journals Response of soil organic carbon to vegetation degradation along a moisture gradient in a wet meadow on the Qinghai-Tibet Plateau

2018 ◽  
Vol 8 (23) ◽  
pp. 11999-12010 ◽  
Author(s):  
Abdul-Rauf Malimanga Alhassan ◽  
Weiwei Ma ◽  
Guang Li ◽  
Zhirong Jiang ◽  
Jiangqi Wu ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Soil Organic Carbon ◽  
Moisture Gradient ◽  
Tibet Plateau ◽  
Wet Meadow ◽  
Vegetation Degradation ◽  
Qinghai Tibet Plateau

Climate change affects soil labile organic carbon fractions in a Tibetan alpine meadow

2016 ◽  
Vol 17 (2) ◽  
pp. 326-339 ◽  
Author(s):  
Yigang Hu ◽  
Zengru Wang ◽  
Qi Wang ◽  
Shiping Wang ◽  
Zhishan Zhang ◽  
...  
Keyword(s):  
Climate Change ◽  
Organic Carbon ◽  
Alpine Meadow ◽  
Carbon Fractions ◽  
Labile Organic Carbon ◽  
Soil Labile Organic Carbon ◽  
Organic Carbon Fractions
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