scholarly journals Soil enzyme activities as potential indicators of soluble organic nitrogen pools in forest ecosystems of Northeast China

2012 ◽  
Vol 69 (7) ◽  
pp. 795-803 ◽  
Author(s):  
Kai Yang ◽  
Jiaojun Zhu ◽  
Qiaoling Yan ◽  
Jinxin Zhang
Keyword(s):  
Enzyme Activities ◽  
Northeast China ◽  
Organic Nitrogen ◽  
Forest Ecosystems ◽  
Soil Enzyme ◽  
Soil Enzyme Activities ◽  
Nitrogen Pools ◽  
Soluble Organic Nitrogen

scholarly journals Temporal Variations in Soil Enzyme Activities and Responses to Land-Use Change in the Loess Plateau, China

2019 ◽  
Vol 9 (15) ◽  
pp. 3129 ◽  
Author(s):  
Deng ◽  
Chong ◽  
Zhang ◽  
Ren ◽  
Zhao ◽  
...  
Keyword(s):  
Alkaline Phosphatase ◽  
Temporal Variation ◽  
Soil Nutrients ◽  
Loess Plateau ◽  
Enzyme Activities ◽  
Dissolved Organic Nitrogen ◽  
Organic Nitrogen ◽  
Soil Enzyme ◽  
Soil Enzyme Activities ◽  
The Loess Plateau

Variability in soil enzyme activity may have important implications for the knowledge of underground ecosystem functions driven by soil extracellular enzymes. To illustrate the temporal variation in soil enzyme activity after afforestation, we collected soil samples during different vegetative growth periods in three Caragana korshinskii Kom. stands of different ages (20, 30, and 40 years) and in a slope cropland in the Loess Plateau. These samples were used to analyze the catalase, sucrase, urease and alkaline phosphatase activities, the soil water content and the available soil nutrients (i.e., dissolved organic carbon, dissolved organic nitrogen, and available phosphorus). The results illustrated that the soil enzyme activities significantly increased following afforestation and varied with temporal variation. Overall, soil enzyme activities were higher in June and August, particularly, and both alkaline phosphatase and sucrase were more sensitive to temporal variation than the other two enzymes. In addition, redundancy analysis showed that soil enzyme activities were greatly correlated with soil nutrients, especially for dissolved organic carbon and dissolved organic nitrogen. Therefore, the results highlighted the importance of soil enzyme activities to soil nutrients under temporal variation following afforestation in the Loess Plateau, which may have practical significance for forest managers’ fertilization management of plantation in different seasons and different stand ages.

scholarly journals Soil Enzyme Activities and Their Relationships With Soil C, N, and P in Peatlands From Different Types of Permafrost Regions, Northeast China

2021 ◽  
Vol 9 ◽  
Author(s):  
Chao Liu ◽  
Yanyu Song ◽  
Xingfeng Dong ◽  
Xianwei Wang ◽  
Xiuyan Ma ◽  
...  
Keyword(s):  
Enzyme Activities ◽  
Northeast China ◽  
Soil Enzymes ◽  
Soil Enzyme ◽  
Permafrost Region ◽  
Permafrost Degradation ◽  
Soil Physicochemical Properties ◽  
Soil Enzyme Activities ◽  
Continuous Permafrost ◽  
Permafrost Regions

Peatland is a key component of terrestrial ecosystems in permafrost regions and have important effects on climate warming. Soil enzymes are involved in biogeochemical cycle of soil carbon (C), nitrogen (N) and phosphorus (P), which can be used as early sensitive indicators of soil nutrient changes caused by climate change. To predict the possible effects of permafrost degradation on soil enzymes in peatlands, ten peatlands from three types of permafrost regions along the permafrost degradation sequence (predominantly continuous permafrost region-predominantly continuous and island permafrost region-sparsely island permafrost region) in northeast China were selected to examine the activities of soil invertase, β-glucosidase, urease and acid phosphatase and their relationships with soil physicochemical properties. The results demonstrated that permafrost type had significant effect on soil enzyme activities. Soil enzyme activities in predominantly continuous and island permafrost region were significantly higher than those in sparsely island permafrost region and predominantly continuous permafrost region. The activities of four soil enzymes were higher in 0–15 cm than 15–30 cm soil layer. Soil enzymes activities were positively correlated with soil ammonia nitrogen (NH4+-N), soil moisture content (SMC), total phosphorus (TP) and total nitrogen (TN), but negatively correlated with soil nitrate nitrogen (NO3−-N). Soil inorganic nitrogen and moisture contents were the main factors affecting soil enzyme activities, with NH4+-N accounted for 41.6% of the variance, SMC 29.6%, and NO3−-N 11.0%. These results suggested that permafrost degradation may change soil enzyme activities by changing soil physicochemical properties. In this study, only 0–30 cm peat soil in permafrost regions was collected during the complete thawing period of permafrost active layer, further studies should be placed on the change of soil enzyme activities in active layer and permafrost layer during freezing and thawing process in the southernmost location of northeast China in the Eurasia permafrost body and boreal forest belt.

Change Analysis of Enzyme Activity under Different Conditions of Film Remnant in Soil

2012 ◽  
Vol 518-523 ◽  
pp. 39-43
Author(s):  
Xiao Guang Zhao ◽  
Yuan Yuan Guan ◽  
Wen Yu Huang
Keyword(s):  
Enzyme Activity ◽  
Enzyme Activities ◽  
Scientific Basis ◽  
Soil Enzyme ◽  
Soil Microorganism ◽  
Soil Enzyme Activities ◽  
Change Analysis ◽  
Soil Material ◽  
The Relationship

In this paper, simulated experiments were performed in pots by using soil materials in different conditions of film remnant. Based on the research on soil microorganism quantity trends of soil enzyme activities were analyzed systematically: soil without film remnant, soil with film remnant for 5, 10, 15 and 20 years. By analyzing crop progress, the relationship with soil material was studied, in order to provide scientific basis for the variation laws between different conditions of film remnant and the activity of soil enzyme.

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