川西亞高山針葉林土壤有機層酶活性
[Abstract]:Litter decomposition plays an irreplaceable role in maintaining the "self-fertilization" mechanism and ecosystem structure and function of subalpine forests. The fresh litter layer (LL),) of soil organic layer of Minjiang fir (Abies faxoniana) and spruce (Picea aspoerata) coniferous forest in Western Sichuan was studied. The semi-decomposing layer (FL) and humus layer (HL) litter and mineral soil layer soil were studied. The characteristics of enzyme activity related to the transformation of carbon, nitrogen and phosphorus in different decomposition stages of litter were studied by simulating the different decomposition stages of litter. The results showed that the content of organic carbon and cellulose in the soil organic layer of two tree species and the content of C _ (N) in litter were the highest in LL and the highest in lignin content, 尾-1,4-glucanase, and 尾-1,4-glucanase were the highest in soil organic layer. The activity of 尾-glucosidase and acid phosphatase decreased with the increase of litter decomposition, but the activity of polyphenol oxidase was opposite. The activity of peroxidase decreased in spruce forest with the deepening of litter decomposition, but increased in fir forest. The activities of leucine aminopeptidase and N-acetyl-尾-D-glucosaminidase in the litter of Picea spruce forest increased first and then decreased with the increase of decomposition degree. The activity of N-acetyl-尾-D-glucosaminidase in fir forest decreased with the increase of decomposition degree. The activities of 尾-glucosidase, peroxidase, polyphenol oxidase, N-acetyl-尾-D-glucosaminidase and acid phosphatase were significantly affected by litter level and tree species interaction. The effects of tree species on 尾-1, 4-exoglucanase and leucine aminopeptidase activities were not significant, and the activities of 尾-1, 4-exoglucanase, 尾-glucosidase, peroxidase and acid phosphatase were negatively correlated with the ratio of lignin to N, and there was no significant correlation between the activities of 尾-1, 4-exoglucanase and leucine aminopeptidase. The activities of leucine aminopeptidase and N-acetyl-尾-D-glucosaminidase were positively correlated with carbon content. The above results indicate that the change of substrate quality is the driving force of enzyme activity change during litter decomposition of coniferous forest in the alpine forests of West Sichuan.
【作者單位】: 四川農業(yè)大學生態(tài)林業(yè)研究所//長江上游林業(yè)生態(tài)工程四川省重點實驗室//高山森林生態(tài)系統(tǒng)定位研究站//水土保持與荒漠化防治省級重點實驗室;長江上游生態(tài)安全協(xié)同創(chuàng)新中心;
【基金】:國家自然科學基金項目(31500509;31570445;31500358;31670526;31622018) 高等學校博士學科點專項科研基金項目(20135103110002) 四川省教育廳青年項目(14ZB0001) 四川農業(yè)大學科研興趣培養(yǎng)項目(ky2016204);四川農業(yè)大學大學生創(chuàng)新訓練計劃項目(1510626065)
【分類號】:S714.2
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