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- Title
氮添加对三峡库区马尾松-栓皮栋混交林 土壤微生物生物量和酶活性的影响
- Authors
王丽君; 程瑞梅; 肖文发; 孙鹏飞; 沈雅飞; 曾立雄; 陈天
- Abstract
We examined the effects of nitrogen addition (0, 30, 60, and 90 kg N* hm 2,a 1) to soil microbial biomass, enzyme activities, and nutrient contents of the Pinus massoniana-Quercus variabilis mixed plantations in the Three Gorges Reservoir Area, with the aim to provide a theoretical basis for predicting soil carbon dynamics under the background of continuously increasing atmospheric nitrogen deposition in this area. The results showed that nitrogen addition at all levels led to a significant increase of the contents of organic carbon, total nitrogen, microbial biomass carbon (MBC), microbial biomass nitrogen (MBN), and microbial biomass phosphorus (MBP) in the forest soil, while a decrease of soil pH-value, and no significant effect on the total phosphorus content. Nitrogen addition increased the activities of 0-1-4 glucosidase (BG), cellobiose hydrolase (CB), acid phosphatase (AP), N-acetylglucosaminosidase (NAG) and peroxidase (POD), while inhibited that of polyphenol oxidase (PPO). There was a significant seasonal variation in soil oxidase activities, in which the peroxidase activity was higher in May and August, and the polyphenol oxidase activity was the highest in August. Soil enzyme activities were significantly correlated with soil moisture and the contents of soil nutrients, MBC, MBN, and MBP. The variation of soil enzyme activities was caused by the comprehensive effects of multiple factors. The redundancy analysis (RDA) showed that the contents of total soil nitrogen and MBC were the main environmental factors driving soil enzyme activities. The continuous increase of atmosphere nitrogen deposition would lead to soil acidification and promote the turnover of soil organic carbon and nutrient cycling in the Pinus massoniana-Quercus variabilis mixed plantations of the study area.
- Subjects
NITROGEN in soils; POLYPHENOL oxidase; SOIL moisture; ATMOSPHERIC nitrogen; SOIL acidification; FOREST soils; SOIL acidity; SOIL enzymology; MICROBIAL enzymes
- Publication
Chinese Journal of Applied Ecology / Yingyong Shengtai Xuebao, 2022, Vol 33, Issue 1, p42
- ISSN
1001-9332
- Publication type
Article
- DOI
10.13287/j.1001-9332.202201.034