摘要
通过对杂木林、一代、二代及三代杉木人工林的土壤微生物、土壤酶活性及生化作用强度研究表明：随着杉木林取代杂木林及杉木连续栽植代数的增加，土壤微生物总数下降、各主要生理类群数量均呈下降趋势，土壤酶活性减弱，土壤生化作用强度降低。土壤微生物学活性降低是杉木连栽后土壤肥力衰退重要原因之一。
Soil microbes, soil enzyme activity and soil biochemical action intensity in the stands of the broad leaf forest and Cunninghamia lanceolata stand of the first, the second, the third planting were studied comparatively. The results indicated that, through the substitution of Cunninghamia lanceolata plantation (the first planting) for broad leaf forest and then the continuously planting Cunninghamia lanceolata, the total quantity of major soil microbes declined, of which the first rotation of Cunninghamia lanceolata was decreased by 59.88% in the top soil (0～20 cm) compared with that of the broadleaved forest, and that of the second and the third rotation was of 14.68%, 16.51% respectively compared with that of the first rotation. The proportion of bacteria and fungi in the amount microbes increased, while that of actinomyces decreased. The amount of major physiological group including ammonifiers, nitrogenfixing bacteria, cellulosedecomposing microbes, aerobic nitrogen fixing bacteria and anaerobic nitrogen fixing bacteria all decreased. The activity of soil enzyme weakened which include invertase, urease, proteinase, acid phosphtase, catalase and perxidase. Soil biochemical action activity impared which include ammonification, nitrification, nitrogen fixation, and decomposition of cellulose. As to the soil respiration, the release amounts of CO 2 decreased, while the RQ value increased. All of which may led to the degradation of the soil fertility.
出处
《生物多样性》
CAS
CSCD
1999年第1期1-7,共7页
Biodiversity Science
基金
福建省自然科学基金
关键词
杉木
连栽
土壤微生物
土壤酶活性
杂木林
Cunninghamia lanceolata, Continuous planting, soil microbes, soil enzyme activity
