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中文摘要：
研究了不同月份、不同密度下川西亚高山丘桦（Betula albo—sinensis）幼苗土壤蔗糖酶活性对温度升高（ET）、大气CO2浓度升高（EC）及其复合作用（ETC）的响应．结果表明：ET处理下，各月份土壤蔗糖酶活性均表现出不同程度的提高，其中5、6、9和10月份达到显著水平（P〈0．05）；EC处理下，各月份土壤蔗糖酶活性均显著提高，各月份土壤蔗糖酶活性表现为高密度根际土壤（HR）〉低密度根际土壤（LR）〉高密度非根际土壤（HN）〉低密度非根际土壤（LN）；不同月份的土壤蔗糖酶活性对ETC和遮荫（CS）处理的响应不同，其响应动态与季节变化、植物密度以及蔗糖酶在土壤中的位置密切相关．
英文摘要：
Taking the soil planted with subalpine Betula albo-sinensis seedlings in Western Sichuan as test object, this paper studied the responses of its invertase activity to elevated temperature （ET）, elevated atmospheric CO2 concentration （EC）, and their combination （ETC）. The results indicated that ET increased the soil invertase activity to a certain extent, being significant in May, June, September and October. EC also had a significant positive effect on the enzyme activity from May to October （P 〈 0.05 ） , which was higher in rhizosphere than in non-rhizosphere soil, and in those planted with high density B. albo-sinersis. The responses of soil invertase activity to ETC and shading differed with month, planting density of B. albo-sinensis, and distribution pattern of the enzyme.
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