科尔沁沙地3种灌木凋落物分解速率及其与关键气象因子的关系

Litter Decomposition Rates of Three Shrub Species in Horqin Sandy Land and Their Relationship with Key Meteorological Factors

选取科尔沁沙地3种代表性灌木(差不嘎蒿、黄柳、小叶锦鸡儿)作为研究对象,采用网袋法对其凋落物进行研究,每月取样测试,结合试验期间当地气象资料,对凋落物在不同类型沙丘、不同深度的分解率进行相关分析。结果表明,生长季节内,放置在地表的凋落物在固定沙丘上的分解率大于其在流动沙丘上的分解率,而在冬春季节却相反;凋落物在地下10cm深处的分解普遍快于地表;经过一年的分解,差不嘎蒿的分解率大于另两种植物,以固定沙丘地表放置为例,其最终分解率为53.6%,大于小叶锦鸡儿的28.5%及黄柳的21%;降水对凋落物的分解影响较地温更大。

Litter decomposition rates of three shrub and Caragana microphylla） in Horqin Sandy Land species （ Artemisia halodendron, Salix gordejevii, were investigated. Collected litter was put in nylon bag and then was put on different kinds of sand dunes or was buried deep down/ in 10 cm, with sampling and weighing it every month. The results showed the decomposition rate of litter put on the fixed sand dunes was higher than the decomposition rate of litter put on the mobile sand dune from May to August, and the situation was just the reverse in winter. The decomposition rate of litter/buried in the sand dunes was higher than the decomposition rate of litter put on the sand dune. Litter decomposition rates of Artemisia halo-dendron was higher than that of the other two shrub species, for example, decomposition rates of litter of Artemisia halodendron put on the fixed sand dunes was 53.6 % after one year, while that of Caragana microphylla and Salix gordejevii was 28.5 % and 21% respectively. Impact of precipitation on litter decomposition rates was more significant than that of ground temperature.