植物生态学报 ›› 2008, Vol. 32 ›› Issue (4): 786-797.DOI: 10.3773/j.issn.1005-264x.2008.04.007
收稿日期:
2007-09-03
接受日期:
2008-02-18
出版日期:
2008-09-03
发布日期:
2008-07-30
通讯作者:
周广胜
作者简介:
*E-mail:gszhou@ibcas.ac.cn基金资助:
ZHANG Feng, ZHOU Guang-Sheng(), WANG Yu-Hui
Received:
2007-09-03
Accepted:
2008-02-18
Online:
2008-09-03
Published:
2008-07-30
Contact:
ZHOU Guang-Sheng
摘要:
植被净初级生产力及其对气候变化的响应研究是全球变化的核心内容之一。在利用内蒙古典型草原连续13年的地上生物量资料对基于遥感信息的生态系统碳循环过程CASA(Carnegie-Ames-Stanford Approach)模型验证的基础上, 分析了内蒙古典型草原1982~2002年植被净初级生产力(Net primary productivity, NPP)的时间变异及其影响因子。结果表明: 1) 1982~2002年21年间内蒙古典型草原的平均年NPP为290.23 g C·m-2·a-1, 变化范围为 145.80~502.84 g C·m-2·a-1; 2)内蒙古典型草原NPP呈增加趋势, 但没有达到显著性水平, 其中1982~1999年的18年间NPP呈现非常显著的增加趋势(p<0.01),NPP增加的直接原因是由于生长旺季生长本身增强所致; 3)内蒙古典型草原NPP与年降水量呈极显著的相关关系, 年降水量显著影响NPP的变异, 而NPP与年均温无显著相关关系。
张峰, 周广胜, 王玉辉. 基于CASA模型的内蒙古典型草原植被净初级生产力动态模拟. 植物生态学报, 2008, 32(4): 786-797. DOI: 10.3773/j.issn.1005-264x.2008.04.007
ZHANG Feng, ZHOU Guang-Sheng, WANG Yu-Hui. DYNAMICS SIMULATION OF NET PRIMARY PRODUCTIVITY BY A SATELLITE DATA-DRIVEN CASA MODEL IN INNER MONGOLIAN TYPICAL STEPPE, CHINA. Chinese Journal of Plant Ecology, 2008, 32(4): 786-797. DOI: 10.3773/j.issn.1005-264x.2008.04.007
图3 内蒙古典型草原21年平均年内分布格局 a: 净初级生产力 NPP b: 归一化植被指数NDVI c: 年降水量 Annual precipitation (AP) d: 年均温 Annual mean temperature (AMT)
Fig. 3 Temporal patterns of Inner Mongolian typical steppe
图4 1982~2002年内蒙古典型草原NPP、T-NDVI、AMT和AP的年际变异特征 a: 净初级生产力 Net primary productivity (NPP) b: 归一化植被指数T-NDVI c: 年降水量 Annual precipitation (AP) d: 年均温 Annual temperature (AMT)
Fig. 4 Inter-annual changes in Inner Mongolian typical steppe
图5 内蒙古典型草原年NPP与年内月最大NPP的相关分析
Fig.5 Relationship between NPP and the amplitude of the NPP annual cycle during 1982-2002 in Inner Mongolian typical steppe
图6 内蒙古典型草原净初级生产力(NPP)与年均温和年降水量的相关关系
Fig. 6 Relationships between net primary productivity (NPP) and annual precipitation (AP), annual mean temperature (AMT) in Inner Mongolian typical steppe from 1982 to 2002
图7 1982~2002年内蒙古典型草原的温湿度胁迫因子、湿度胁迫因子和温度胁迫因子年际变异特征
Fig. 7 Trends in temperature and moisture stress scalars (T & M scalars), moisture stress scalars (M scalars), and temperature scalars (T scalars) from 1982 to 2002 in Inner Mongolian typical steppe
决定系数R2 R2 value between NPP and x | 平均值 Mean value | 变异系数 Coefficient of variation (%) | |
---|---|---|---|
年均温 Annual mean temperature (℃) | 0.037 6 | 2.9 | 29.0 |
年降水量 Annual precipitation (mm) | 0.505 2 *** | 266.4 | 28.1 |
归一化差异植被指数之和 T-NDVI | 0.900 3 *** | 2.29 | 16.5 |
水分胁迫因子 Moisture stress scalars | 0.002 6 | 8.70 | 10.4 |
温度胁迫因子 Temperature stress scalars | 0.156 3 | 5.65 | 3.6 |
水分、温度胁迫因子 Temperature and moisture stress scalars | 0.489 2 *** | 4.06 | 8.9 |
表1 NPP与其影响因子的相关分析结果
Table 1 Relationships between NPP and their climatic driving factors
决定系数R2 R2 value between NPP and x | 平均值 Mean value | 变异系数 Coefficient of variation (%) | |
---|---|---|---|
年均温 Annual mean temperature (℃) | 0.037 6 | 2.9 | 29.0 |
年降水量 Annual precipitation (mm) | 0.505 2 *** | 266.4 | 28.1 |
归一化差异植被指数之和 T-NDVI | 0.900 3 *** | 2.29 | 16.5 |
水分胁迫因子 Moisture stress scalars | 0.002 6 | 8.70 | 10.4 |
温度胁迫因子 Temperature stress scalars | 0.156 3 | 5.65 | 3.6 |
水分、温度胁迫因子 Temperature and moisture stress scalars | 0.489 2 *** | 4.06 | 8.9 |
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