摘要
利用中国唯一的无锡FACE(Free-air CO2 enrichment,开放式空气CO2浓度升高)平台,研究了大气CO2浓度升高对土壤β-葡糖苷酶、转化酶、脲酶、酸性磷酸酶、β-氨基葡糖苷酶的影响。研究发现,不同氮肥处理下大气CO2浓度升高对某些土壤酶活性的影响不同。在低氮施肥处理中,大气CO2浓度升高显著降低β-葡糖苷酶活性,但是在高氮施肥处理下,大气CO2浓度升高显著增加β-葡糖苷酶活性。在低氮和常氮施肥处理中大气CO2浓度升高显著增加了土壤脲酶活性,但在高氮水平下影响不显著。在低氮、常氮施肥处理中,大气CO2浓度升高对土壤酸性磷酸酶活性没有影响,而在高氮施肥处理中显著增强了土壤中磷酸酶活性。大气CO2浓度升高对土壤转化酶活性和β-氨基葡糖苷酶的活性有增加趋势,但影响不显著。研究还发现,在不同的CO2浓度下,土壤酶活性对不同氮肥处理的响应也不同。在正常CO2浓度下,土壤中β-葡糖苷酶活性随着氮肥施用量的增加而降低,而在大气CO2浓度升高条件下,却随着氮肥施用量的增加而增加。在大气CO2浓度升高条件下,高氮施肥显著增加了转化酶和酸性磷酸酶活性,而在正常CO2浓度下,影响不显著。在大气CO2浓度升高条件下,氮肥处理对脲酶活性的影响不大,但在正常CO2浓度下,脲酶活性随着氮肥施用量的增加而增加。氮肥对β-氨基葡糖苷酶活性的影响不明显。
It has been predicted that elevated atmospheric CO2 will increase enzyme activity as a result of CO2-induced carbon entering the soil. The objective of this study was to investigate the effects of elevated atmospheric CO2 on soil enzyme activities under a rice/wheat rotation. This experiment was conducted in Wuxi, Jiangsu, China under China FACE （Free Air Carbon dioxide Enrichment） Project system. Two atmospheric CO2 concentrations （（ 580 ± 60） and （380 ± 40） μmol· mol^-1） ） and three N application treatments （low nitrogen, LN 150 kg· hm^-2, normal nitrogen, NN 250 kg· hm^-2 and high nitrogen, HN 350kg· hm^-2） were included. Soil samples （0 - 10 cm） were collected for analysis of β-glucosidase, invertase, urease, acid phosphates and β-glucosaminidase activities. Results revealed that with elevated atmospheric CO2 β-glucosidase activity significantly decreased（p 〈 0.05） at low N application rates; had no significant effect with a normal N application rate; and significantly increased （p 〈 0.05） with a high N application rate. For urease activity, at low and normal N application rates （but not high N application rate）, elevated atmospheric CO2 significantly increased （p 〈 0.05） it. With acid phosphatase elevated atmospheric CO2 only had significant higher effects （p 〈 0.05） at high N application rates. Under different CO2 concentration, effects of N fertilization are also different. Soil β-glucosidase activity at ambient CO2 concentration decreased with N fertilization, while it increased at elevated CO2 concentration. In addition, invertase and acid phosphatase activities at elevated CO2 concentrations, significantly increased （p 〈 0.05） with N treatments, but there was no effect with the ambient CO2 concentration. For urease activity, at ambient CO2 concentrations, N fertilization increased it significantly （p 〈 0.05）, whereas at elevated CO2 concentrations were not significant. Additionally, with β-glucosaminidase activity, there were
出处
《生态学报》
CAS
CSCD
北大核心
2006年第1期48-53,共6页
Acta Ecologica Sinica
基金
国家自然科学基金资助项目(40271066)
国家自然科学基金重点资助项目(40231003)
中国科学院创新方向资助项目(KZCXZ-408)~~
关键词
大气CO2浓度升高
土壤酶活性
氮肥处理
elevated atmospheric CO2
soil enzyme activity
N fertilization treatment
