不同二氧化碳浓度条件下红松和长白赤松土壤生化特性研究

Soil biochemical characters of Pinus koraiensis and Pinus sylvestriformis plantations under different elevated CO_2 concentration.

以连续 5年在生长季以不同浓度CO2 (70 0和 5 0 0 μmol·mol-1)处理的长白赤松和红松幼苗为研究对象 ,进行了土壤微生物生物量C、纤维素分解月动态以及过氧化氢酶活性动态研究 .结果表明 ,在秋季 ,红松和长白赤松土壤微生物生物量C在不同浓度CO2 处理箱的大小顺序均为 :对照箱 >5 0 0 μmol·mol-1箱 >70 0 μmol·mol-1箱 ;红松和长白赤松土壤 5和 10cm层在不同浓度CO2 处理下 ,其纤维素分解强度的月动态均表现出一定的规律性 ,且各处理之间在每个月份中也表现出一定的规律性 ;在生长季 ,红松和长白赤松土壤纤维素分解强度在 5和 10cm层均表现为 5 0 0 μmol·mol-1CO2 处理下较 70 0 μmol·mol-1CO2 处理下高 ;红松和长白赤松土壤过氧化氢酶活性在不同浓度CO2 处理之间均表现出一定的规律性 ,且各处理的月动态变化也呈现出一定的规律性 .

The aim of this study was to determine the dynamics of soil microbial biomass C,cellulose decomposition rate and catalase activity in Pinus koraiensis and Pinus sylvestriformis plantations exposed to elevated CO 2 (700 mg·L -1 and 500 mg·L -1) during the growth season.The five years results indicated that in Autumn,the soil microbial biomass C of Pinus koraiensis and Pinus sylvestriformis plantations was in the order of ambient CO 2-chamber>500 mg·L -1 CO 2-chamber >700 mg·L -1 CO 2-chamber.The monthly dynamics of cellulose decomposition rate in 5 and 10 cm depth soils showed that for both Pinus sylvestriformis and Pinus koraiensis plantations,it was always higher under 500 mg·L -1 CO 2 than under 700 mg·L -1 CO 2 in growth season.Between different CO 2 concentration treatments,soil catalase activity of Pinus koraiensis and Pinus sylvestriformis plantations displayed a definite pattern of its monthly dynamics.