基于CASA模型的藏北地区草地植被净第一性生产力及其时空格局 | |
高清竹1; 万运帆1; 李玉娥1; 林而达1; 杨凯1; 江村旺扎2; 王宝山2; 李文福2 | |
刊名 | 应用生态学报 |
2007 | |
卷号 | 18期号:11页码:2526-2532 |
关键词 | 藏北地区 高寒草地 NPP 时空格局 CASA模型 |
ISSN号 | 1001-9332 |
其他题名 | Grassland net primary productivity and its spatiotemporal distribution in Northern Tibet: A study with CASA model |
英文摘要 | 基于1981-2004年遥感监测和气象数据,采用CASA(Carnegie-Ames-Stanford Approach)模型模拟分析藏北地区草地植被净第一性生产力(NPP)及其时空变化特征.结果表明:受水热条件的制约,藏北地区草地植被NPP空间分布规律呈水平地带性分布,由东南向西北逐渐由230 g C·m~(-2)·a~(-1)减少到接近0.藏北地区草地植被NPP整体水平较低,年均草地植被总NPP为21.5×10~(12) g C· a~(-1),多年平均值仅为48.1 g C·m~(-2)·a~(-1),明显低于青藏高原和其它草原区.藏北地区坡度小于1°平地和平滩地,以及南坡的草地植被年平均NPP相对较低.藏北主要高寒草地7-9月NPP占全年NPP的64.0%~70.0%.1981-2004年间,藏北地区草地植被总NPP的年际变化较大,并有进一步下降趋势.; Based on the remote sensing data,meteorological data and other related data from 1981 to 2004,the grassland net primary productivity(NPP)and its spatiotemporal distribution in Northern Tibet were analyzed by CASA(Carnegie-Ames-Stanford Approach)model.The results indicated that in the study area,the spatial distribution of grassland NPP was affected by the local water and heat conditions,and represented a horizontal zonality.From southeast to northwest,the grassland NPP reduced from 230 g C·m~(-2)·a~(-1) to near 0 g C·m~(-2)·a~(-1).The overall level of grassland NPP in Northern Tibet was rather low,with the multi-years average value of total NPP being 21.3×10~(12) g C· a~(-1) and the mean value of NPP being 48.1 g C·m~(-2)·a~(-1),which were obviously lower than those in Qinghai-Tibetan Plateau and other grassland areas of China.The mean values of NPP on flat land(slope gradient <1°)and south slope were relatively lower.On the main alpine grasslands in Northern Tibet,the NPP from July to September occupied 64.0%-70.0% of the whole year.From 1981 to 2004,the grassland NPP within the whole Northern Tibet had a greater annual fluctuation,and tended to further reduce. |
学科主题 | 植物学 |
语种 | 中文 |
内容类型 | 期刊论文 |
源URL | [http://111.203.20.206/handle/2HMLN22E/17408] |
专题 | 农业环境与可持续发展研究所_气候变化研究室 |
作者单位 | 1.中国农业科学院农业环境与可持续发展研究所, 北京, 100081 2.西藏自治区那曲地区农牧局, 西藏, 那曲, 852100 |
推荐引用方式 GB/T 7714 | 高清竹,万运帆,李玉娥,等. 基于CASA模型的藏北地区草地植被净第一性生产力及其时空格局[J]. 应用生态学报,2007,18(11):2526-2532. |
APA | 高清竹.,万运帆.,李玉娥.,林而达.,杨凯.,...&李文福.(2007).基于CASA模型的藏北地区草地植被净第一性生产力及其时空格局.应用生态学报,18(11),2526-2532. |
MLA | 高清竹,et al."基于CASA模型的藏北地区草地植被净第一性生产力及其时空格局".应用生态学报 18.11(2007):2526-2532. |
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