CO_2浓度升高与增施钾肥对土壤化学性质的影响

Effects of Elevated CO_2 and Potassium on Soil Chemical Properties

采用土培和开顶箱法,研究了大气CO2浓度升高与增施K肥共同作用对土壤化学性质的影响。结果表明,土壤中N、P的含量在高CO2浓度和高K肥水平下下降,K的含量随K肥用量增加而增加。高K(200、300mg/kg)处理和高浓度CO2下温室次生盐渍化土壤中的NO3-、PO43-、Ca2+、Mg2+含量也显著降低。因此,在未来CO2浓度升高的环境中,更多的K肥供应能促进作物对此生盐渍化土壤中养分的吸收,降低此生盐渍化土壤中盐分的积累。

Cucumber was cultured in open-top CO2 controlled chambers to study the interactive effects of elevated CO2 and potassium （K） on soil quality chemical properties. The results indicated that N and P nutrient contents in soil decreased at elevated CO2and higher K supply, and K nutrient content increased with the increase of K supply. Higher K supply （200 and 300 mg/kg）and elevated CO2 reduced NO3^-, PO4^3＋, Ca^2＋ and Mg^2＋ contents in soil. Therefore, in the future elevated environment higher K supply can improve the nutrient uptakes of crop from secondary salinity soil and reduce salt ions accumulation.