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川西亚高山针叶林由于其特殊地理位置和特定生态环境下植被的演替动态,使之成为全球变化的敏感性区域之一。本文通过原位模拟升高温度2(±0.4)℃和CO2浓度加倍对川西亚高山针叶林土壤过氧化氢酶活性的影响。结果显示升温和升高CO2浓度对岷江冷杉(Abies faxoniana)根际和非根际土壤过氧化氢酶活性的影响不同,还与冷杉的种植密度有关。同时,冷杉根际和非根际土壤过氧化氢酶活性对升高温度和CO2浓度的响应还随着时期而发生变化。另外,遮荫处理也会影响土壤过氧化氢酶活性。原位研究结果表明亚高山针叶林土壤酶对升高温度和CO2的响应并非简单的提高或者抑制,不同时期、不同密度以及与非根际环境中过氧化氢酶活性反应差异很大,可能涉及的土壤学和生态学过程十分复杂,需深入研究。
Subalpine coniferous forests in western Sichuan have become one of the sensitive areas of global change because of their special geographical location and the succession of vegetation in a particular ecological environment. In this paper, through in situ simulation of elevated temperature 2 (± 0.4) ℃ and doubled CO2 concentration on the activity of catalase in the subalpine coniferous forest in western Sichuan. The results showed that the effects of elevated temperature and elevated CO2 on catalase activity in rhizosphere and non-rhizosphere soil of Abies faxoniana were different, and also related to the planting density of Abies faxoniana. At the same time, the response of catalase activity in fir rhizosphere and non-rhizosphere soil to elevated temperature and CO2 concentration also changed with time. In addition, shading also affects soil catalase activity. In situ studies showed that the response of soil enzymes to elevated temperature and CO2 in subalpine coniferous forests was not simply increased or inhibited, and the response to catalase activity differed significantly in different periods, at different densities and in non-rhizosphere environments, The soil science and ecology processes involved are complex and require further study.