飞播油松林地土壤酶活性对间伐强度的响应  

Response of Soil Enzyme Activity to Thinning Intensity of Aerial Seeding Pinus tabulaeformis Stands

作　　者：郭蓓[1] 刘勇[1] 李国雷[1] 甘敬[2] 徐扬[1] 

机构地区：[1]北京林业大学森林培育教育部重点实验室,北京100083 [2]北京市园林绿化局,北京100029

出　　处：《林业科学》2007年第7期128-133,共6页Scientia Silvae Sinicae

基　　金：国家自然科学基金(30471380);北京市教委项目资助。

摘　　要：In 2000, the effect of thinning intensities with five different treatments of 0%(CK), 30%(slight thinning), 48.75%(middle thinning),53.75%(intense thinning) and 65.6%(super intense 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 QingQuanPu Aerial Seeding Center, Yanqing County of Beijing Municipality. Five years later, the activities of the five soil enzymes such as soil urease, alkaline phosphatase, inertase, catalase and polyphenol oxidase in the different soil layers of A(0～20 cm), B(20～40 cm) and C(40～60 cm) were compared. Moreover, relationships among soil enzymes, soil physiochemical properties and the diversity of the undergrowth were analyzed to prove the availability of using soil enzymes to evaluate the thinning intensities. The results showed that soil catalase varied slightly while the other four soil enzymes decrease with increasing soil depth. And the soil enzymes in the layer A were enhanced distinctly compared with in the layers B and C. Also, the five soil enzymes in the layer A were affected differently by thinning intensities, showing that soil urease and alkaline phosphatase were highest response to slight thinning followed by the middle thinning, opposite to the trend of inertase and polyphenol oxidase. There are significantly positive relationships between soil enzymes and soil physiochemical characteristics and the organic C and total N was more dominant than available K as well as available P. Except soil polyphenol oxidase, the other soil enzymes showed positive relationships with biodiversity of the undergrowth. It was concluded that reasonable thinning intensity was benefit to the development of the undergrowth and so can be to soil enzymes. Generally, when the stand with initial density of 8 000 trees·hm -2 grows up to 9 years old, the reasonable thinning intensity should be about 48.75%.In 2000, the effect of thinning intensities with five different treatments of 0 % （ CK）, 30 % （ slight thinning）, 48.75 % （ middle thinning）, 53.75 % （ intense thinning） and 65.6 % （ super intense 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 QingQuanPu Aerial Seeding Center, Yanqing County of Beijing Municipality. Five years later, the activities of the five soil enzymes such as soil urease, alkaline phosphatase, inertase, catalase and polyphenol oxidase in the different soil layers of A（0 - 20 cm）, B（20 - 40 cm） and C（40- 60 cm） were compared. Moreover, relationships among soil enzymes, soil physiochemical properties and the diversity of the undergrowth were analyzed to prove the availability of using soil enzymes to evaluate the thinning intensities. The results showed that soil catalase varied slightly while the other four soil enzymes decrease with increasing soil depth. And the soil enzymes in the layer A were enhanced distinctly compared with in the layers B and C. Also, the five soil enzymes in the layer A were affected differently by thinning intensities, showing that soil urease and alkaline phosphatase were highest response to slight thinning followed by the middle thinning, opposite to the trend of inertase and polyphenol oxidase. There are significantly positive relationships between soil enzymes and soil physiochemical characteristics and the organic C and total N was more dominant than available K as well as available P. Except soil polyphenol oxidase, the other soil enzymes showed positive relationships with biodiversity of the undergrowth. It was concluded that reasonable thinning intensity was benefit to the development of the undergrowth and so can be to soil enzymes. Generally, when the stand with initial density of 8 000 trees· hm^- 2 grows up to 9 years old, the reasonable thinning intensity should be about 48.75 %.

关 键 词：油松 飞播林 间伐强度 土壤酶 土壤养分 生物多样性 

分 类 号：S753.5[农业科学—森林经理学]