title: [Soil hydrolase characteristics in late soil-thawing period in subalpine/alpine forests of west Sichuan].
abstract: Late soil-thawing period is a critical stage connecting winter and growth season. The significant temperature fluctuation at this stage might have strong effects on soil ecological processes. In order to understand the soil biochemical processes at this stage in the subalpine/alpine forests of west Sichuan, soil samples were collected from the representative forests including primary fir forest, fir and birch mixed forest, and secondary fir forest in March 5-April 25, 2009, with the activities of soil invertase, urease, and phosphatase (neutral, acid and alkaline phosphatases) measured. In soil frozen period, the activities of the three enzymes in test forests still kept relatively higher. With the increase of soil temperature, the activities of hydrolases at the early stage of soil-thawing decreased rapidly after a sharp increase, except for neutral phosphatease. Thereafter, there was an increase in the activities of urease and phosphatase. Relative to soil mineral layer, soil organic layer had higher hydrolase activity in late soil-thawing period, and showed more obvious responses to the variation of soil temperature.
authors.affiliation: Faculty of Forestry, Sichuan Agricultural University, Ya' an 625014, Sichuan, China. bobotan1984@163.com
authors.forename: Bo
authors.initials: B
authors.lastname: Tan
authors.forename: Fu-Zhong
authors.initials: FZ
authors.lastname: Wu
authors.forename: Wan-Qin
authors.initials: WQ
authors.lastname: Yang
authors.forename: Sheng
authors.initials: S
authors.lastname: Yu
authors.forename: Yu-Lian
authors.initials: YL
authors.lastname: Yang
authors.forename: Ao
authors.initials: A
authors.lastname: Wang
mesh_terms: D028202:Abies / Q000254:growth & development; D000531:Altitude; D029662:Betula / Q000254:growth & development; D002681:China; D006867:Hydrolases / Q000378:metabolism*; D010744:Phosphoric Monoester Hydrolases / Q000378:metabolism; D012621:Seasons; D012987:Soil / Q000032:analysis*; D014197:Trees / Q000254:growth & development*; D014510:Urease / Q000378:metabolism
chemical_list: D012987:Soil; D006867:Hydrolases; D010744:Phosphoric Monoester Hydrolases; D014510:Urease