祁连山北坡天然草地不同尺度地上生物量空间格局对地形的响应

被引:8
作者
侯兆疆
赵成章
董小刚
李钰
张茜
马小丽
机构
[1] 西北师范大学地理与环境科学学院甘肃省湿地资源保护与产业发展工程研究中心
关键词
天然草地; 地上生物量; 广义相加模型; 地形因子; 尺度依赖;
D O I
10.13292/j.1000-4890.20131220.0037
中图分类号
S812 [草地学、草原学];
学科分类号
090503 ; 0909 ;
摘要
草地群落地上生物量的空间格局反映了地形差异导致的群落资源配置空间异质性。采用草地群落调查与广义相加模型(GAM)相结合的方法,分析了祁连山北坡典型草原山体尺度和坡面尺度上群落地上生物量格局的响应特征。结果表明:山体尺度上,群落地上生物量受地形因子影响的顺序为海拔>坡向变率≈坡度变率≈坡度;利用坡向作为划分条件将山体尺度缩小为坡面尺度后,东、西两个坡面群落地上生物量受坡向变率的影响最大,南、北坡则分别受海拔和坡度变率的影响最大,其中草地群落地上生物量在东坡随坡向变率的增大先减少后增加,西坡随坡向变率的增大先增加后减少,南坡随海拔的上升而增加,北坡随坡度变率的增大先不变后减少;草地群落地上生物量空间格局在山体尺度和坡面尺度上具有明显的尺度依赖特征。
引用
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页码:10 / 15
页数:6
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