Soil hydrolase characteristics in late soil-thawing period in subalpine/alpine forests of west Sichuan
Late soil-thawing period is a critical stage connecting winter and growth season. The significant temperature fluctuation at this stage might have strong eflects 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 fiom 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 soilthawing decreased rapidly after a sharo 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.
国家科技期刊平台
NSTL
万方数据
维普
