Spatial-temporal Analysis of Vegetation Net Primary Productivity in Shaanxi Province Based on CASA Model

SHI Zhihua; LIU Mengyun; WU Jianli; CHANG Qingrui; XIE Baoni; WEN Yi

doi:10.13961/j.cnki.stbctb.2016.01.037

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Spatial-temporal Analysis of Vegetation Net Primary Productivity in Shaanxi Province Based on CASA Model

- Spatial-temporal Analysis of Vegetation Net Primary Productivity in Shaanxi Province Based on CASA Model
- Bulletin of Soiland Water Conservation Vol. 36, Issue 1, Pages: 206-211(2016)
- 作者机构：
  
  1. 农业部农业环境重点实验室,北京,100081
  2. 黄石市国土资源局,湖北,黄石,435000
  3. 西北农林科技大学资源环境学院, 陕西杨凌,712100
  4. 中国科学院寒区旱区环境与工程研究所,甘肃,兰州,730000
- 作者简介：
- 基金信息：
- DOI：10.13961/j.cnki.stbctb.2016.01.037
  CLC：
- Published：2016
- 稿件说明：
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SHI Zhihua, LIU Mengyun, WU Jianli, et al. Spatial-temporal Analysis of Vegetation Net Primary Productivity in Shaanxi Province Based on CASA Model[J]. Bulletin of Soiland Water Conservation, 2016, 36(1): 206-211.
DOI：

SHI Zhihua, LIU Mengyun, WU Jianli, et al. Spatial-temporal Analysis of Vegetation Net Primary Productivity in Shaanxi Province Based on CASA Model[J]. Bulletin of Soiland Water Conservation, 2016, 36(1): 206-211. DOI： 10.13961/j.cnki.stbctb.2016.01.037.

摘要

[目的

]

探明陕西省近年来植被净初级生产力(net primary productivity

NPP)的变化及评估植被的生长条件. [方法

]

基于CASA(Carnegie Ames Stanford Approach)模型估算陕西省2003—2012年逐月NPP

并分析其年际、年内的时空变化特征及趋势. [结果

]

(1) 陕西省2003—2012年植被NPP总体呈增长趋势(p

0.01)

年均增量为3.940 6 g/(m

·a)(以C含量计);年总NPP从2003年的84.44 Tg(1 Tg=1012 g)增加到2012年的91.98 Tg.(2) NPP年内变化明显

夏季NPP占年总量的比例最高

达到52.43%

8两月占比最高

分别为18.52%和18.41%.只有3和8月NPP增长趋势显著或极显著

其他月份NPP变化不显著.(3) 不同植被NPP的年际变化比较平稳

除永久湿地外

其他植被类型的NPP呈增长趋势

耕地的NPP增长最快(p

0.01)

年均增量为5.89 g/(m

·a).(4) NPP整体呈南高北低、高低相间的分布特征

全省78.53%的区域NPP呈增长趋势

24.47%的区域增长显著或极显著;NPP降低显著/极显著的面积仅占2.27%

主要分布在陕西中部和西安周边地区. [结论

]

陕西植被生长条件总体在改善

但局部在恶化.

Abstract

[Objective] This study aims to verify variation of vegetation net primary productivity(NPP) in Shaanxi Province in recent years in order to evaluate vegetation growing conditions. [Methods] Based on the Carnegie Ames Stanford approach(CASA) model

this study estimated the monthly NPP from 2003 to 2012 in Shaanxi Province. The annual and inter-annual variation of NPP were analyzed at both spatial and temporal scale. [Results] (1) The NPP in Shaanxi Province showed an increasing trend and increased (p<0.01) at a rate of 3.940 6 g/(m2·a). The total annual NPP increased from 84.44 Tg (1 Tg=1 012 g) in 2003 to 91.98 Tg in 2012(in terms of carbon content). (2) The NPP varied greatly in different seasons. The highest NPP occurred in summer

which accounted for 52.43% of the total NPP

and NPP in July

August accounted for 18.52%

18.41% respectively. NPP in March or August increased significantly or extremely significantly

while no significant change of NPP was found in the other months. (3) Annual variation of NPP for different vegetation types was comparatively stable

and showed an increasing tendency except the permanent wetlands. The fastest increase of NPP was crop land (p<0.01)

with an average annual increment rate of 5.89 g/(m2·a). (4) The NPP in Southern Shaanxi was higher than the northern

78.53% of the area showed a growing trend in NPP

and 24.47% of the area increased significant or extremely significant. Only 2.27% of the area showed a significantly or extremely significantly decreasing trend in NPP

those areas were mainly distributed in the central Shaanxi Province and surrounding area of Xi'an City. [Conclusion] The vegetation growing conditions in Shaanxi Province was generally improved

but the local region were deteriorating.

关键词

Keywords

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