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土壤节肢动物对箭竹凋落叶分解过程中酶活性的影响

冯瑞芳1,刘育伟2,郭可馨2,蓝丽英2,谌亚2,刘静如2,谭波2*   

  1. 1四川大学锦城学院建筑学院, 成都 611731;  2四川农业大学生态林业研究所/长江上游林业生态工程四川省重点实验室/高山森林生态系统定位研究站/水土保持与荒漠化防治省级重点实验室, 成都 611130)
  • 出版日期:2020-03-10 发布日期:2020-03-10

Effects of soil arthropod on enzyme activities during leaf litter decomposition of bamboo (Fargesia spathacea).

FENG Rui-fang1, LIU Yu-wei2, GUO Ke-xin2, LAN Li-ying2, CHEN Ya2, LIU Jing-ru2, TAN Bo2*#br#   

  1. (1Architecture & Project Engineering, Jincheng College of Sichuan University, Chengdu 611731, China; 2Institute of Ecology & Forestry, Sichuan Agricultural University, Forestry Ecological Engineering in Upper Reaches of Yangtze River Key Laboratory of Sichuan Province, Alpine Forest Ecosystem Research Station, Soil and Water Conservation and Desertification Control Key Laboratory of Sichuan Province, Chengdu 611130, China).
  • Online:2020-03-10 Published:2020-03-10

摘要: 为了解凋落物分解过程中土壤节肢动物与土壤酶活性的相互联系,以川西亚高山森林箭竹(Fargesia spathacea)凋落叶为对象,通过原位控制实验,于2016年4月至2018年4月研究了土壤节肢动物对凋落叶分解过程中碳、氮和磷转化相关酶活性的影响。结果表明:生物抑制剂施用降低了分解袋中土壤节肢动物49.7%~66.8%的个体密度和19.2%~46.3%的类群数量;对照和处理分解袋中凋落叶碳、氮和磷转化相关酶活性随分解过程呈现相似的动态;与处理相比,土壤节肢动物参与(对照)显著提高了凋落叶分解过程中蔗糖酶、β-葡聚糖苷酶、纤维素酶、多酚氧化酶、过氧化物酶、N-乙酰-β-D-氨基葡萄糖苷酶和酸性磷酸酶活性;土壤节肢动物对凋落叶分解过程中酶活性的贡献率在达到一个明显的峰值后快速降低;土壤温度和土壤节肢动物类群数量与蔗糖酶活性呈显著正相关,与β-葡聚糖苷酶、纤维素酶、多酚氧化酶、过氧化物酶、N-乙酰-β-D-氨基葡萄糖苷酶和酸性磷酸酶活性呈显著负相关。土壤节肢动物对凋落叶分解过程中酶活性促进效应随酶类型和分解时间变化存在差异,与土壤节肢动物群落结构和分解环境密切相关。

关键词: 胁迫处理, 光质, 紫背天葵, 生长, 次生代谢物

Abstract: To understand the relationship between soil arthropod and soil enzyme activity during litter decomposition, an experiment on decomposition of bamboo (Fargesia spathacea) leaf litter was conducted in a subalpine forest of western Sichuan. Soil arthropods were repelled by adding naphthalene to the forest floor. The effects of soil arthropod on the enzyme activities related to carbon, nitrogen and phosphorus transformation during litter decomposition were examined from April 2016 to April 2018. The results showed that the individual density and species richness of soil arthropod in litterbags were reduced by 49.7%-66.8% and 19.2%-46.3% with naphthalene addition, respectively. The enzyme activities related to carbon, nitrogen and phosphorus transformation in the treatment (naphthalene addition) and control (no naphthalene addition) litterbags showed similar dynamics. The presence of soil arthropod significantly increased the activities of invertase, β-glucosidase, cellobiohydrolase, polyphenol oxidase, peroxidase Nacetyl-β-D-glucosaminidase and acid phosphatase in decomposing bamboo leaf litter of the control litterbags. The contribution of soil arthropod to enzyme activity deceased rapidly after a peak value during litter decomposition. During the study period, soil temperature and species richness of soil arthropod showed positive correlations with invertase activity but negative correlation with the other enzymes. These results suggest that the stimulating effects of soil arthropods on enzyme activities differ with enzyme types and decomposition time, and have a close correlation with the soil arthropod community structure and decomposition environment.

Key words: Gynura bicolor, growth, secondary metabolites, light quality, stress treatment.