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Seasonal response of soil enzyme activity to thinning intensity in aerial seeding Pinus tabulaeformis stands

LI Guo-lei~1;LIU Yong~1;GAN Jing~2;GUO Bei~1;XU Yang~1.1 Key Laboratory for Silviculture and Conservation,Ministry of Education,Beijing Forestry University,100083,P.R.China;2 Beijing Municipal Bureau of Landscape and Forestry,100029,P.R.China.  
Aerial seeding is one of the most important vegetation restoration patterns in remote hilly areas,and the study concerning soil quality and its management is valuable to the practice.In 2000,the effects of thinning intensity with five different treatments of 0%(CK),30%(slight thinning),48.75%(middle thinning),53.75%(intensive thinning) and 77.13%(super intensive thinning) on the soil enzyme were carried out in the 9-year-old aerial seeding Pinus tabulaeformis stands with initial density of 8 000 trees/hm~2,in Wangjiapu Aerail Seeding Center,Yanqing County of Beijing.Five years later,the activities of the five kinds of soil enzymes such as soil urease,alkaline phosphatase,inertase,catalase and polyphenol oxidase in the soil layer of 020 cm were compared in four seasons.Moreover,relations among soil enzymes and soil physiochemical properties were analyzed to prove the availability of using soil enzymes to evaluate the thinning intensities.The results showed that the maximum enzyme activities of catalase and polyphenol oxidase occurred in June.While those of soil urease and alkaline phosphatase occurred in October,its of soil invetase was in April.Also,the five soil enzymes were affected differently by thinning intensities.Soil catalase,urease and invertase were the highest response to slight thinning,followed by the middle thinning,opposite to polyphenol oxidase and alkaline phosphatase to middle thinning.There are significantly positive relations between soil enzymes and the organic C and available K.It should be noted that soil water was a limiting factor to soil enzymes possible.Compared with soil physicochemical characteristics,soil enzymes were more sensitive to thinning intensity.Among them,soil alkaline phosphatase and catalase could be regarded as indicators to assess soil quality.It is concluded that reasonable thinning intensity is benefitial to the development of the undergrowth and soil enzymes.Generally, when the stand with initial density of 8 000 trees/hm~2 grows up to nine years old,the reasonable thinning intensity should be about 48.75%.
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