scholarly journals Influence of Mining and Vegetation Restoration on Soil Properties in the Eastern Margin of the Qinghai-Tibet Plateau

2020 ◽  
Vol 17 (12) ◽  
pp. 4288
Author(s):  
Yunlong Hu ◽  
Zhifeng Yu ◽  
Xiangling Fang ◽  
Weixiong Zhang ◽  
Jinrong Liu ◽  
...  
Keyword(s):  
Trace Metals ◽  
Soil Properties ◽  
Soil Ph ◽  
Enzyme Activities ◽  
Soil Enzyme ◽  
Vegetation Restoration ◽  
Tibet Plateau ◽  
Soil Enzyme Activities ◽  
Native Grassland ◽  
Qinghai Tibet Plateau

Mining causes serious destruction of the surface morphology and soil structure of lands, and vegetation restoration on post-mining lands provides an effective way for soil and water conservation. To determine the influence of mining and vegetation restoration on soil properties in the eastern margin of the Qinghai-Tibet Plateau, four land sites, including two vegetation restoration sites (restorated by Elymus nutans and Picea crassifolia, respectively), one non-vegetated mining site and one native grassland site, were selected. Fifty-two topsoil (0–10) samples were collected from these four sites, and then soil properties, trace metals and soil enzyme activities were analyzed. The results showed that there was an increase in soil pH (>8.0) after mining, while vegetation restoration decreased the soil pH compared with native grassland; the soil organic matter and total nitrogen in the site restored with E. nutans increased by 48.8% and 25.17%, respectively, compared with the site restored with P. crassifolia. The soil enzyme activities decreased after mining, and there were no significant increases in urease, phosphatase, β-glucosidase and β-1,4-N-acetylglucosaminidase activities after five years of restoration. In addition, the contents of soil trace metals (cadmium, chromium, mercury, lead and zinc) after mining were lower than the Chinese threshold (GB 15618/2018), but the content of arsenic in non-vegetated soil and P. crassifolia-restored soil exceeded the threshold by 22.61 times and 22.86 times, respectively. Therefore, As-contaminated land areas should be accurately determined and treated in a timely way to prevent arsenic from spreading, and plant species with tolerance to alkaline soil should be selected for vegetation restoration on post-mining lands.

Soil enzyme activities of typical plant communities after vegetation restoration on the Loess Plateau, China

2022 ◽  
Vol 170 ◽  
pp. 104292
Author(s):  
Yuxuan Chen ◽  
Tianxing Wei ◽  
Guoliang Sha ◽  
Qingke Zhu ◽  
Zhao Liu ◽  
...  
Keyword(s):  
Loess Plateau ◽  
Plant Communities ◽  
Enzyme Activities ◽  
Soil Enzyme ◽  
Vegetation Restoration ◽  
Soil Enzyme Activities ◽  
The Loess Plateau

Effects of Biochar Amendment on the Dynamics of Enzyme Activities from a Paddy Soil Polluted by Heavy Metals

2012 ◽  
Vol 610-613 ◽  
pp. 2129-2133 ◽  
Author(s):  
Yage Yang ◽  
Jin Long Yan ◽  
Cheng Ding
Keyword(s):  
Heavy Metals ◽  
Soil Ph ◽  
Paddy Soil ◽  
Enzyme Activities ◽  
Physicochemical Analysis ◽  
Soil Enzyme ◽  
Soil Enzyme Activities ◽  
Undisturbed Soil ◽  
Agricultural Use ◽  
Contaminated Paddy Soil

Reducing heavy metals mobility and improve the soil physical-chemical property in order to reduce plant uptake would be an urgent demand for safe rice production in China. A field experiment was conducted for the research of biochar (BC) amendment on the dynamics of soil enzyme activities in a contaminated paddy soil after 2 years. BC was applied in 2009 before rice transplantation at rates of 0, 10, 20, 40 t ha-1, and three undisturbed soil cores of 0 to 15 cm depth were sampled from each plot for physicochemical analysis and enzymatic monitoring. Compared to the control, the soil pH and SOC were significantly increased by 2–5 % and 16–51 % after BC amendment. The activities of cellulase, urine enzyme, neutral phosphatase and sucrase were also found to increase by 117.4–178.3 %, 31.1–37.6 %, 29.7–193.8 % and 36.5–328.6 %, respectively. Furthermore, there were positive correlation of soil enzyme activities with soil pH and SOC content. Data in this research indicated that BC amendment may be potential in improvement of soil properties to some extent to achieve the agricultural use. Introduction

Response of carbon utilization and enzymatic activities to nitrogen deposition in three forests of subtropical China

2015 ◽  
Vol 45 (4) ◽  
pp. 394-401 ◽  
Author(s):  
Yong-Sheng Wang ◽  
Shu-Lan Cheng ◽  
Gui-Rui Yu ◽  
Hua-Jun Fang ◽  
Jiang-Ming Mo ◽  
...  
Keyword(s):  
Microbial Biomass ◽  
Soil Ph ◽  
Enzyme Activities ◽  
Southern China ◽  
Soil Enzyme ◽  
Total Carbon ◽  
N Addition ◽  
Soil Enzyme Activities ◽  
Microbial Biomass Nitrogen ◽  
Soil Microbial

Nitrogen (N) deposition has been shown to affect soil carbon (C) and N cycling in subtropical forests; however, the underlying microbial mechanisms are poorly understood. We used patterns of community-level physiological profiles and enzyme activities to assess the relative effects of the addition of four N levels (0, 50, 100, and 150 kg·ha−1·year−1) on the soil microbial community in three forest stands (pine, mixed, and broadleaf forests) in southern China, where the forests have been experimentally manipulated for over 8 years. In pine forests, N50 addition significantly increased microbial biomass carbon (MBC) concentration but decreased soil pH levels. N100 addition significantly increased soil peroxidase activity but decreased soil β-1,4-glucosidase activity. In broadleaf forests, N addition increased soil dissolved organic carbon (DOC) concentration and polyphenol oxidase activity but decreased soil MBC concentration and soil pH levels. N addition also significantly increased soil microbial metabolism activity (expressed as average well color development) in pine forest and broadleaf forest soils. However, the mixed forests responded slowly to N additions and exhibited no significant response of C-utilization profiles and soil enzyme activities. Principal component analysis of C-utilization data separated microbial communities with respect to N addition and forest successional stage. In addition, microbial C utilization was driven by soil pH levels. Although enzyme activities were correlated with soil MBC and microbial biomass nitrogen concentrations, stepwise regression results indicated that soil total carbon contents that were integrated with soil pH levels were key integrators of soil enzyme activities. Our results suggest that soil acidification due to N addition increased soil bacterial C utilization and enzyme activities.

Dynamics of soil microbial biomass and soil enzyme activities along a vegetation restoration gradient in a karst peak-cluster depression area

2015 ◽  
Vol 35 (21) ◽  
Author(s):  
叶莹莹 YE Yingying ◽  
刘淑娟 LIU Shujuan ◽  
张伟 ZHANG Wei ◽  
舒世燕 SHU Shiyan ◽  
杨珊 YANG Shan ◽  
...  
Keyword(s):  
Microbial Biomass ◽  
Enzyme Activities ◽  
Soil Microbial Biomass ◽  
Soil Enzyme ◽  
Vegetation Restoration ◽  
Soil Enzyme Activities ◽  
Peak Cluster ◽  
Soil Microbial
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