风沙土区黄柳根系及其碳储量分布特征

以内蒙古敖汉旗风沙土区15 a、25 a和35 a林龄的黄柳(Salix gordejevii)林为研究对象,分别设置3个样地,采用分层分段挖掘法,测定不同土层、土段的根系生物量、含碳率,计算根系碳储量,分析不同林龄黄柳根系及根系碳储量分布特征变化。随着土层深度的增加,黄柳根系生物量呈现先增加后减少的趋势,主要分布在0~100cm土层,均占根系总量的80%以上;15 a、25 a和35 a生黄柳根系总生物量分别为516.50、4 448.60 g·株~(-1)和7 257.7 g·株~(-1),随着林龄的增加,黄柳根系生物量呈增长趋势。根系碳储量分布特征呈梭形,15 a、25 a和35 a生黄柳根系总生物量分别为30.81、158.56 g·株~(-1)和229.9 g·株~(-1);随着林龄的增加呈增加趋势。

Distribution of Roots and Root Carbon Stocks of Salix gordejevii in Aohan Banner,Inner Mongolia

Salix gordejevii forests with stand ages of 15,25 and 35 years in a sandified zone in Aohan Banner,Inner Mongolia were researched by delimiting three sample plots,the stratified segmentation mining method was used to measure the root biomass and the carbon content in different soil layers ánd segments,the root carbon stocks were calculated,and the distribution and variation of root carbon stocks of S.gordejevii plants with different stand ages were analyzed.The root biomass of S.gordejevii plants increased at first and then decreased with the increase of soil depth,the roots were mainly distributed in soil layer of 0-100 cm in depth,and their proportion accounted for more than 80％ of the total.The total root biomasses of 15-,25-and 35-year-old S.gordejevii plants were 516.50,4 448.60 and 7 257.77 g · plant-1 respectively,that means the root biomass increased with the increase of stand age.The distribution of root carbon stocks was in a fusiform,and the root carbon stocks of 15-,25-and 35-year-old S.gordejevii plants were 30.81,158.56 and 229.9 g · m-2 respectively,that means the root carbon stocks increased with the increase of stand age of S.gordejevii plants.