地理学报 ›› 2016, Vol. 71 ›› Issue (1): 35-48.doi: 10.11821/dlxb201601003
收稿日期:
2015-10-09
修回日期:
2015-12-15
出版日期:
2016-01-31
发布日期:
2016-01-15
作者简介:
作者简介:陈晓玲(1991-), 女, 福建漳州人, 硕士, 主要从事遥感与地理信息系统及其环境变化研究.E-mail:
基金资助:
CHEN Xiaoling1,2(), ZENG Yongnian1,2
Received:
2015-10-09
Revised:
2015-12-15
Published:
2016-01-31
Online:
2016-01-15
Supported by:
摘要:
以湖南省为研究区,采用250 m×250 m空间分辨率的MODIS-NDVI数据,结合相应时间段的气象数据,使用改进的CASA模型,模拟并分析该区域2000-2013年间的植被NPP的时空变化特征,并借助统计分析方法对不同土地覆盖类型中植被NPP的变化趋势及其显著性,NPP与气候因子的相关性进行量化分析.结果表明:① 该区域的净初级生产量年际变化特征明显,年净初级生产量分布在41.62~125.40 Tg C/yr之间,平均值为86.34 Tg C/yr,总体来看,14年间湖南省植被净初级生产量呈波动减少趋势,年际减少趋势为2.70 Tg C/yr;② NPP空间分布差异较大,基本特点是西高东低,南高北低,从西南向东北呈逐渐递减趋势,其中,各植被分区的NPP有明显差异;③ 2000-2013年,湖南省植被NPP呈极显著增加(slope >0,p < 0.01),显著增加(slope > 0,0.01 ≤ p < 0.05),无明显变化(p ≥ 0.05),极显著减少(slope < 0,p < 0.01)和显著减少(slope < 0,0.01 ≤ p < 0.05)的区域分别占总面积的比例为5.40%,2.02%,61.64%,16.79%和14.15%.植被NPP变化趋势总体上显示为减少的趋势,而不同土地覆盖类型的植被NPP变化趋势及显著性存在较大差异,其中草地的NPP变化趋势最为显著,接着依次是森林,其他土地,建设用地和农田;④ 分析不同土地覆盖类型的植被NPP对气候因子的响应,发现NPP与降水量之间的相关关系强于其与温度的相关关系.
陈晓玲, 曾永年. 亚热带山地丘陵区植被NPP时空变化及其与气候因子的关系----以湖南省为例[J]. 地理学报, 2016, 71(1): 35-48.
CHEN Xiaoling,ZENG Yongnian. Spatial and temporal variability of the net primary production (NPP) and its relationship with climate factors in subtropical mountainous and hilly regions of China: A case study in Hunan province[J]. Acta Geographica Sinica, 2016, 71(1): 35-48.
表1
湖南省土地覆盖类型及NPP模型输入参数
一级类型 | 类型代码 | 二级类型 | NDVImax | NDVImin | εmax |
---|---|---|---|---|---|
森林 | 11 | 常绿针叶林 | 0.737 | 0.575 | 0.39 |
12 | 常绿阔叶林 | 0.732 | 0.530 | 0.99 | |
13 | 落叶针叶林 | 0.739 | 0.579 | 0.49 | |
14 | 落叶阔叶林 | 0.730 | 0.558 | 0.69 | |
15 | 针阔混交林 | 0.740 | 0.594 | 0.48 | |
16 | 灌丛 | 0.749 | 0.622 | 0.43 | |
草地 | 21 | 草甸草地 | 0.561 | 0.299 | 0.54 |
22 | 典型草地 | 0.715 | 0.509 | 0.54 | |
26 | 灌丛草地 | 0.739 | 0.612 | 0.54 | |
农田 | 31 | 水田 | 0.650 | 0.499 | 0.54 |
32 | 水浇地 | 0.615 | 0.473 | 0.54 | |
33 | 旱地 | 0.675 | 0.497 | 0.54 | |
建设 用地 | 41 | 城镇建设用地 | 0.550 | 0.273 | 0.54 |
42 | 农村建设用地 | 0.630 | 0.431 | 0.54 | |
其他 土地 | 51 | 沼泽 | 0.633 | 0.420 | 0.54 |
53 | 内陆水体 | -- | -- | -- | |
54 | 河湖滩地 | 0.601 | 0.291 | 0.54 | |
61 | 裸岩 | -- | -- | -- | |
62 | 裸地 | -- | -- | -- |
表2
2000-2013年湖南省不同土地覆盖类型NPP与气候因子相关性
面积百分比(%) | ||||||
---|---|---|---|---|---|---|
一级类型 | 气候因子 | 平均相关系数 | 显著正相关 | 不显著正相关 | 显著负相关 | 不显著负相关 |
森林 | 降水 | 0.056 | 5.27 | 63.10 | 3.67 | 27.96 |
*降水 | 0.044 | 6.09 | 57.60 | 5.09 | 31.23 | |
气温 | -0.015 | 7.22 | 38.77 | 7.35 | 46.67 | |
*气温 | 0.005 | 7.36 | 42.26 | 7.59 | 42.79 | |
草地 | 降水 | 0.041 | 7.60 | 61.05 | 5.00 | 26.34 |
*降水 | 0.033 | 6.77 | 55.52 | 5.65 | 32.07 | |
气温 | 0.004 | 7.56 | 42.84 | 7.23 | 42.37 | |
*气温 | 0.013 | 7.23 | 44.72 | 7.17 | 40.88 | |
农田 | 降水 | 0.074 | 4.88 | 64.78 | 3.70 | 26.70 |
*降水 | 0.052 | 7.36 | 58.02 | 5.61 | 29.01 | |
气温 | -0.057 | 6.73 | 31.91 | 7.07 | 54.28 | |
*气温 | -0.028 | 7.11 | 35.66 | 7.58 | 49.66 | |
建设用地 | 降水 | 0.052 | 4.25 | 58.13 | 4.05 | 33.57 |
*降水 | 0.041 | 5.73 | 59.18 | 4.98 | 30.11 | |
气温 | -0.028 | 7.22 | 40.31 | 7.22 | 45.25 | |
*气温 | -0.008 | 7.93 | 48.97 | 7.74 | 35.36 | |
其他土地 | 降水 | 0.106 | 4.40 | 65.65 | 4.20 | 25.75 |
*降水 | 0.137 | 4.37 | 71.75 | 4.02 | 19.87 | |
气温 | 0.031 | 6.92 | 46.17 | 6.70 | 40.21 | |
*气温 | 0.090 | 7.54 | 57.79 | 6.85 | 27.82 |
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