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首页> 外文期刊>Journal of Forestry Research >Effects of long-term elevated CO_2 on N-2-fixing, denitrifying and nitrifying enzyme activities in forest soils under Pinus sylvestriformis in Changbai Mountain
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Effects of long-term elevated CO_2 on N-2-fixing, denitrifying and nitrifying enzyme activities in forest soils under Pinus sylvestriformis in Changbai Mountain

机译：长期升高的CO_2对长白山樟子松林区土壤N-2固定，反硝化和硝化酶活性的影响

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摘要

A study was conducted to determine the effects of elevated CO2 on soil N process at Changbai Mountain in Jilin Province, northeastern China (42 degrees 24'N, 128 degrees 06'E, and 738 m elevation). A randomized complete block design of ambient and elevated CO2 was established in an open-top chamber facility in the spring of 1999. Changpai Scotch pine (Pinus sylvestris var. sylvestriformis seeds were sowed in May, 1999 and CO2 fumigation treatments began after seeds germination. In each year, the exposure started al the end of April and stopped at the end of October. Soil samples were collected in June and August 2006 and in June 2007, and soil nitrifying, denitrifying and N-2-fixing enzyme activities were measured. Results show that soil nitrifying enzyme activities (NEA) in the 5-10 cm soil layer were significantly increased at elevated CO2 by 30.3% in June 2006, by 30.9% in August 2006 and by 11.3% in June 2007. Soil denitrifying enzyme activities (DEA) were significantly decreased by elevated CO2 treatment in June 2006 (P < 0.012) and August 2006 (P < 0.005) samplings in our study; no significant difference was detected in June 2007, and no significant changes in N-2-fixing enzyme activity were found. This study suggests that elevated CO2 can alter soil nitrifying enzyme and denitrifying enzyme activities.
机译：进行了一项研究以确定二氧化碳浓度升高对中国东北吉林省长白山土壤氮进程的影响（北纬42度，北纬128度，东经128度，海拔738 m）。 1999年春季，在开放式室内设施中建立了一个随机的，完整的，环境高的CO2整块设计。长排樟子松（Pinus sylvestris var。sylvestriformis种子于1999年5月播种，种子发芽后开始进行CO2熏蒸处理。每年的暴露始于4月底，停止于10月底，分别于2006年6月和2006年8月以及2007年6月收集土壤样品，并测量土壤硝化，反硝化和固氮作用。结果表明，在2006年6月，CO 2浓度升高时，5-10厘米土壤层中的土壤硝化酶活性（NEA）明显增加了30.3％，2006年8月增加了30.9％，2007年6月增加了11.3％。在我们的研究中，2006年6月（P <0.012）和2006年8月（P <0.005）的CO2浓度升高显着降低了DEA）; 2007年6月未检测到显着差异，N-2固定酶的含量也无显着变化。发现了酶活性。这项研究表明，升高的二氧化碳可以改变土壤硝化酶和反硝化酶的活性。

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