关键词: 日本落叶松, 土壤微生物, 土壤养分, 土壤酶活性, 典范对应分析

Abstract: The relationship between mackerel (Scomber australasicus) catch per unit effort (CPUE) and sea surface environmental factors of the Arabian Sea were evaluated by using general additive model (GAM) based on the satellitebased oceanographic data of sea surface temperature, sea surface chlorophyll-a concentration, sea surface current  and sea surface height  as well as purse seine catch data of Chinese fishing boats from 2016 to 2017. The results showed that the percentage of deviance explained by GAM was 30.1%. The fishing grounds were affected by the Indian Ocean monsoon. The CPUE of mackerel was higher in winter monsoon and lower in summer monsoon. The CPUE of mackerel mainly located in 65°E and 13-15°N. The optimum sea surface temperature was 26-28 ℃. The appropriate chlorophyll concentration range and sea surface height were 0.2-0.5 mg·m^-3  and 0.2-0.4 m, respectively. The relative importance of the several variables affecting the CPUE of mackerel was in the order of sea surface height, longitude and latitude, sea surface temperature, and chlorophyll concentration.

Key words: Larix kaempferi , soil microorganism, soil nutrient, soil enzyme activity, CCA.