3种典型沙生灌木NPP及其分配格局  

NPP and its distribution pattern of three typical sandy shrubs

作　　者：赵灿[1,2] 张宇清[1] 秦树高[1] 赖宗锐[1,2] 刘加彬[1,2] 法科宇[1,2] 

机构地区：[1]北京林业大学水土保持学院 [2]宁夏盐池荒漠生态系统定位研究站

出　　处：《北京林业大学学报》2014年第5期62-67,共6页Journal of Beijing Forestry University

基　　金："十二五"国家科技支撑计划项目(2012BAD16B02)

摘　　要：植物的净初级生产力(NPP)是确定生态系统碳收支的重要指标。分别采用收获法和内生长土芯法测定了毛乌素沙地3种典型沙生灌木杨柴、沙柳和油蒿的地上部分和地下部分生长量,并通过元素分析仪分别测定各器官的含碳率,进而计算3种灌木的NPP。结果表明,杨柴、沙柳、油蒿3种灌木的NPP分别为63.13、96.39和63.98g(m2·a),根冠生长量的比值分别为2.71、2.02和1.32。杨柴、沙柳和油蒿地上与地下生长量均符合等速生长关系,可以基于地上部分NPP来估算地下部分NPP。Net primary productivity （NPP） is an important index for evaluating carbon budgets of ecosystem. In order to determine the NPP of three kinds of typical sandy shrubs, harvest method and ingrowth cores method were used to determine aboveground and belowground growth, and elemental analyzer was used to measure each organ carbon content rate. The results showed that NPP of Astragalus mongolicum, Salix psammophila and Artemisia ordosica was 63.13, 96. 39 and 63.98 g/（ m2 · year）. The growth ratios of root to shoot of A. mongolicum, S. psammophila and A. ordosica were 2.71, 2.02 and 1.32, respectively. Three shrub species were accordance with isometric allocation relationship between the growth of above- and belowground parts. The findings suggest that the belowground NPP of A. mongolicum, S. psammophila and A. ordosica can be estimated based on the aboveground NPP.

关 键 词：杨柴 沙柳 沙蒿 净初级生产力 等速生长 

分 类 号：S718.45[农业科学—林学]