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中国农学通报

中国农学通报 ›› 2011, Vol. 27 ›› Issue (29): 284-289.

所属专题： 农业气象

• 资源 环境 生态 土壤 气象 • 上一篇    下一篇

宁夏中南部近25年植被变化特征及其与气候因子的关系

李菁 王连喜 李琪 李剑萍   

  • 收稿日期:2011-03-21 修回日期:2011-04-06 出版日期:2011-11-15 发布日期:2011-11-15
  • 基金资助:

    国家“十一五”科技支撑计划重大项目;科技部公益性行业（气象）科研专项

Features of Vegetation Change in the Middle South of Ningxia and its Relationship with Climatic Factors in the Nearly 25 Years

  • Received:2011-03-21 Revised:2011-04-06 Online:2011-11-15 Published:2011-11-15

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摘要：

为了深入了解宁夏中南部地区的植被在月、季、年和年代际等多时间尺度上变化特征，包括绿波褐波推移情况，以及这种变化与气候因子的关系，笔者利用1982年—2006年的植被指数（NDVI）资料以及气温、降水资料，对宁夏中南部地区植被的变化特征及其对气候变化的响应进行了分析。结果表明：宁夏中南部的植被状况25年来尽管有波动起伏，但是整体上持续转好。从植被覆盖的季节变化可以看出：除夏季外，其他3个季节的植被指数都在增加；通过研究绿波褐波的推移发现，植被指数变化具有明显的季节性和一定的地域性。根据统计分析，季节平均NDVI与降水量呈正相关，与气温呈负相关，春季降水量与春夏2季植被生长、夏季降水量与秋季植被生长有较高的相关度，春夏季降水量是影响宁夏中南部植被状况的主要因素。综上所述，当地植被生长主要受气温和降水的季节变化影响。因此，气候变化的趋势在一定程度上可以通过植被的动态变化反映出来。

关键词: 香蕉枯萎病菌, 香蕉枯萎病菌, 防御酶系, 香蕉, 品种抗病性

Abstract:

In order to learn about features of vegetation change in the middle south of Ningxia on the monthly average, seasonal average, the annual average and decadal time, including the change of green and brown waves, and its relationship with climate variables, the author used the monthly GIMMS Normalized Difference Vegetation Index (NDVI) data and the data of precipitation and temperature in the middle south of Ningxia between 1982 and 2006, found that the annual mean of NDVI was getting better continuously, although there were undulations in vegetation cover over past 25 years in this region. The dynamic variations of NDVI on a seasonal basis obvious increases occurred except summer. The change of green and brown waves revealed that NDVI had significantly seasonal and regional variation. From the statistical analysis, the result showed that the seasonal annual NDVI showed a positive correlation with precipitation, and a negative correlation with surface air temperature Moreover there was a significant positive correlation between spring mean precipitation and following summer, fall and annual mean NDVI, suggesting that spring rainfall was a key factor to determine the distribution of vegetation in the middle south of Ningxia. In summary, relationships between annual variation of seasonal vegetation and climatic factors represented temporal rhythm controls of temperature and precipitation on grass growth, and dynamic monitoring of the vegetation variation could reflect the trend of climate change to some extent.