【摘要】 分析高寒草甸不同土地利用格局下土壤CO2 的释放量大小表明 ,在植物生长季的 5～ 9月 ,土壤CO2 释放量大小排序为 :金露梅灌丛草甸 ( 1 871 4 0 g/m2 ) >矮嵩草草甸 ( 1 769 63g/m2 ) >退化金露梅灌丛草甸 ( 1 4 95 60 g/m2 ) >退化矮嵩草草甸 ( 1 1 91 2 6g/m2 ) ;而在植物非生长季的 1 0月到翌年 4月 ,其土壤CO2 释放量大小与植物生长季略有差异 ,表现出矮嵩草草甸 ( 661 4 6g/m2 ) >金露梅灌丛草甸 ( 5 5 0 90 g/m2 ) >退化矮嵩草草甸( 5 0 2 5 0 g/m2 ) >退化金露梅灌丛草甸 ( 384 5 0 g/m2 )的特点 ;全年内表现为矮嵩草草甸 ( 2 4 31 0 9g/m2 ) >金露梅灌丛草甸 ( 2 4 2 2 30g/m2 ) >退化金露梅灌丛草甸 ( 1 880 1 0g/m2 ) >退化矮嵩草草甸 ( 1 694 0 6g/m2 ) .高寒草甸地区不同土地利用格局土壤CO2 释放数量的差异及季节变化 ,不仅与各利用格局的土壤生物活性及土壤物理化学性状有关 ,而且与气象条件 (特别是温度 )及其土壤冬季冻结期长短关系极为密切更多还原

【Abstract】 The value order of carbon dioxide emission from different land use of alpine meadow was significantly with season changing.It was found that the Potentilla fruticosa shrub meadow(C,1871.40g/m 2)> Kobresia humilis meadow(A,1769.63g/m 2)>Degraded Potentilla fruticosa shrub meadow(D,1495.60g/m 2)>Degraded Kobresia humilis meadow(B,1191.26g/m 2) during growth season,A(661 46g/m 2)>C(550 90g/m 2)>B(502 50g/m 2)>D(384 50g/m 2) in rest period;and A(2431 09g/m 2)>C(2422 30g/m 2)>D(1880 10g/m 2)>B(1694 06g/m 2) for whole year,separately.This deference not only decided the soil microbial activity and soil characters,but also have the closely relationship to shortage of frozen period.更多还原